CA2433242A1 - Detector of commercial jammer - Google Patents
Detector of commercial jammer Download PDFInfo
- Publication number
- CA2433242A1 CA2433242A1 CA 2433242 CA2433242A CA2433242A1 CA 2433242 A1 CA2433242 A1 CA 2433242A1 CA 2433242 CA2433242 CA 2433242 CA 2433242 A CA2433242 A CA 2433242A CA 2433242 A1 CA2433242 A1 CA 2433242A1
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- communication
- communication equipment
- detecting
- jammer
- interfering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
- H04K3/222—Countermeasures against jamming including jamming detection and monitoring wherein jamming detection includes detecting the absence or impossibility of intelligible communication on at least one channel
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The present invention relates to a method and device for detecting a communication-interfering jammer in the proximity of a communication equipment normally receiving an intelligible signal. As a first operation, an absence of reception of the intelligible signal by the communication equipment is detected. A discrimination of the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment is then conducted. A communication-interfering jammer is finally detected in the proximity of the communication equipment when the discrimination indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
Description
DETECTOR OF COMMERCIAL JAMMER
FIELD OF THE INVENTION
The present invention relates to a device for dE;tecting a communication-interfering jammer, in particular but not exclusively a cammercial jammer.
BACKCaROUND OF THE INVENTION
In order to interfere with communications, a conmmercial jammer typically transmits a pseudo-random noise over a whole downlink frequency bandwidth of a communications system or network. Normally, the pseudo-random noise has a substantially constant amplitude over the whole downlink frequency bandwidth.
When this substantially constant amplitude of the pseudo-random noise is sufficiently high, any communication mobile or terminal in close proximity to the jammer will be prevented to receive any intelligible signal from the communication system or network.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a~ method for detecting a communication-interfering jammer in the proximity of a communication equipment normally receiving an intelligible signal, comprising:
detecting an absence of reception of the intelligible signal by the communication equipment; discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one otlher cause for the absence of reception of the intelligible signal by the communication equipment; and detecting a communication-intertering jammer in the proximity of ~0 the communication equipment when the discrimination indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
FIELD OF THE INVENTION
The present invention relates to a device for dE;tecting a communication-interfering jammer, in particular but not exclusively a cammercial jammer.
BACKCaROUND OF THE INVENTION
In order to interfere with communications, a conmmercial jammer typically transmits a pseudo-random noise over a whole downlink frequency bandwidth of a communications system or network. Normally, the pseudo-random noise has a substantially constant amplitude over the whole downlink frequency bandwidth.
When this substantially constant amplitude of the pseudo-random noise is sufficiently high, any communication mobile or terminal in close proximity to the jammer will be prevented to receive any intelligible signal from the communication system or network.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a~ method for detecting a communication-interfering jammer in the proximity of a communication equipment normally receiving an intelligible signal, comprising:
detecting an absence of reception of the intelligible signal by the communication equipment; discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one otlher cause for the absence of reception of the intelligible signal by the communication equipment; and detecting a communication-intertering jammer in the proximity of ~0 the communication equipment when the discrimination indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
The present invention also relates to a device for detecting a communication-interfering jammer in the proximity of a o~~mmunication equipment normally receiving an intelligible signal, comprising: means for detecting an absence of reception of the intelligible signal by the c~Dmmunication equipment; means for discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment; and means for detecting a communication-interfering jammer in the proximity of the communication equipment when the discriminating means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
Further according to the present invention, there is provided a device for detecting a communication-intertering jammer in the proximity of a communication equipment normally receiving an intelligible signal, .comprising:
a detector of an absence of reception of the intelligible signal by the communication equipment;
a discriminator of the detection of a communication-interfering jammer in the proximity of the communication equipment from air least one other cause for the absence of reception of the intelligible signal by the communication equipment; and a detector of a communication-interfering jamrner in the proximity of the communication equipment when the discrimination means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
The foregoing and other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of an illustrative embodiment thereof, givE:n by way of example only with reference to the accompanying drawings.
Further according to the present invention, there is provided a device for detecting a communication-intertering jammer in the proximity of a communication equipment normally receiving an intelligible signal, .comprising:
a detector of an absence of reception of the intelligible signal by the communication equipment;
a discriminator of the detection of a communication-interfering jammer in the proximity of the communication equipment from air least one other cause for the absence of reception of the intelligible signal by the communication equipment; and a detector of a communication-interfering jamrner in the proximity of the communication equipment when the discrimination means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
The foregoing and other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of an illustrative embodiment thereof, givE:n by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
Figure 1 is a schematic block diagram of the non-restrictive, illustrative embodiment of the device according to the present invention, fc~r detecting a communication-interfering jammer in the proximity of a ccammunication equipment; and Figure 2 is a schematic flow chart: showing the operation of the non-restrictive, illustrative embodiment of the method according to the present invention, for detecting a communication-interfering jammer in the proximity of a communication equipment.
DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBOCiIMENT
The non-restrictive, illustrative embodiment of the jammer-detecting device in accordance with the present invention constitutes a standalone functionality designed for detecting the presence of a commercial jammer in a frequency bandwidth of interest.
Although the non-restrictive, illustrative embodiment of the method and device of the present invention will be described in relation to a cellular communication system or network, it should be kept in mind that the present invention applies as well to other types of communicatioan systems or networks.
When a mobile or terminal receives no intelligible signal from a cellular communication system or network, an algorithm is required to discriminate jammer detection from two other cases (hereinafter the first and second cases}.
Of course, the non-restrictive, illustrative embodiment of the jamr~er-detecting method and device incorporates such an algorithm.
In the appended drawings:
Figure 1 is a schematic block diagram of the non-restrictive, illustrative embodiment of the device according to the present invention, fc~r detecting a communication-interfering jammer in the proximity of a ccammunication equipment; and Figure 2 is a schematic flow chart: showing the operation of the non-restrictive, illustrative embodiment of the method according to the present invention, for detecting a communication-interfering jammer in the proximity of a communication equipment.
DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBOCiIMENT
The non-restrictive, illustrative embodiment of the jammer-detecting device in accordance with the present invention constitutes a standalone functionality designed for detecting the presence of a commercial jammer in a frequency bandwidth of interest.
Although the non-restrictive, illustrative embodiment of the method and device of the present invention will be described in relation to a cellular communication system or network, it should be kept in mind that the present invention applies as well to other types of communicatioan systems or networks.
When a mobile or terminal receives no intelligible signal from a cellular communication system or network, an algorithm is required to discriminate jammer detection from two other cases (hereinafter the first and second cases}.
Of course, the non-restrictive, illustrative embodiment of the jamr~er-detecting method and device incorporates such an algorithm.
The first case is an out-of-coverage case. This out-of coverage case happens when a mobile or terminal is out-of-coverage, for example when the mobile or terminal is outside cellular coverage in fringe areas or inside a building with high penetration loss.
The second case is met when the mobile or terminal is located in an area with strong cellular interference on the common control channel(s). More specifically, this situation is met in locations where strong common control channels) is (are) received, these strong common control channels) originating from multiple cellular base stations operating at the same frequency (for FDMA
(Frequency Division Multiple Access) systems) or with the same code (for CDMA
(Code Division Multiple Access) systems).
The structure and operation of the non-restrictive, illustrativE; embodiment of the jammer-detecting method and device according to the pre:9ent invention will now be described with reference to Figures 1 and 2 of tlhe appended drawings. It should be mentioned here that the references 101-107 (including 104a) refer to Figure 1 while the references 201-20T (including ~?04a) refer to Figure 2.
Discrimination of the out-of coverage case Operation 201 The non-restrictive, illustrative embodiment of the jammer-detecting device comprises a mobile or terminal reception detector 101 for detecting that the mobile or terminal no longer receives an intelligible signal from the cellular communication system or network.
When a mobile or terminal no longer receives an intelligible signal from the cellular system or network, the out-of-coverage discrimination is first executed. Detection that the mobile or terminal no longer receives an intelligible signal can be carried out through conventional methods well knov~m to those of ordinary skill in the art. An example is the detection of a signal-to-noise ratio lower than a given threshold.
The second case is met when the mobile or terminal is located in an area with strong cellular interference on the common control channel(s). More specifically, this situation is met in locations where strong common control channels) is (are) received, these strong common control channels) originating from multiple cellular base stations operating at the same frequency (for FDMA
(Frequency Division Multiple Access) systems) or with the same code (for CDMA
(Code Division Multiple Access) systems).
The structure and operation of the non-restrictive, illustrativE; embodiment of the jammer-detecting method and device according to the pre:9ent invention will now be described with reference to Figures 1 and 2 of tlhe appended drawings. It should be mentioned here that the references 101-107 (including 104a) refer to Figure 1 while the references 201-20T (including ~?04a) refer to Figure 2.
Discrimination of the out-of coverage case Operation 201 The non-restrictive, illustrative embodiment of the jammer-detecting device comprises a mobile or terminal reception detector 101 for detecting that the mobile or terminal no longer receives an intelligible signal from the cellular communication system or network.
When a mobile or terminal no longer receives an intelligible signal from the cellular system or network, the out-of-coverage discrimination is first executed. Detection that the mobile or terminal no longer receives an intelligible signal can be carried out through conventional methods well knov~m to those of ordinary skill in the art. An example is the detection of a signal-to-noise ratio lower than a given threshold.
5 Operation 202 The out-of-coverage discrimination first comprises a comparison of the average power level on at least one common control channel with a predicted noise floor. This comparison is conducted by the signal and noise comparator 102.
As well known to those of ordinary skill in the art, the predicted noise floor is a function of the mobile or terminal noise figure and the frequency bandwidth of concern.
Operation 203 If the difference between the average power level of the common control channel and the predicted noise floor as determined by the sigrral and noise comparator 102 is lower (for example by 10% lower) than the signal-to-noise ratio required for proper operation of the mobile or terminal plus a certain margin to take into consideration normal co-channel interference, the cellular system or network is then considered as out-of-coverage. This condition is detected by the out-of-coverage detector 103.
The signal-to-noise ratio required far proper operation of the mobile or terminal plus the above-mentioned margin will be referred to as the "threshold" in the following description.
If the difference between the average power level of the common control channel and the predicted noise floor as determined by the signal and noise comparator 102 is higher {for example by 10% higher) than the threshold, the cellular system or network is either jammed or in interference on the common control channel. The procedure then goes to operation 205 in order to perform the discrimination of the common channel interference case.
Operation 204 The first time (104a and 204x) the average power level on the common control channel is compared to the predicted noise floor, the difference between this average power level of the common control channel and the predicted noise floor is approximately equal to the threshold (for example equal to the threshold ~10%), the jammer-detecting device waits for a short period of time generated by the timer 204, for example a few seconds.
After this waiting period, as the difference between the average power level of the common control channel and the predicted noise floor is approximately equal to the threshold, the reception may correctly resume. If not, discrimination of the out-of-coverage case is performE;d a second time with the following result:
- If the difference between the average power level of the common control channel and the predicted noise floor is lower (for example by 10% lower) than the threshold, the out-of-coverage detector 103 detects an out-of-coverage condition of the cellular system or network (Operation 203);
- If the difference between the average power level of the common control channel and the predicted noise floor is higher (for example by 10°/~
higher) than the threshold, the cellular system or network is either jammed or in interference on the common crontrol channel, and the procedure then goes to Operation 205; and - If the difference between the average power le~rel of the common control channel and the predicted noise floor is approximately equal (for example equal to the threshold ~10%) to the threshold as a result of the second (104a and 204a) out-of-coverage discrimination (104a and 204a), the cellular system or network is either jammed or in interference on the common control channels, and the procedure then goes to Operation 205.
Discrimination of the common channei interference case At this stage, the jammer-detecting method end device considers the cellular system or network as being jammed or in cellular interference on the common control channel.
Operation 205 Discrimination of the common channel interference case is conducted by first comparing to each other the respective RF (Radio Frequency) power levels of a random set of channels within the relevant frequency bandwidth. 1'he non-restrictive, illustrative embodiment of the jammer-detecting device comprises a random channels power level scanner 105 for performing this comparison.
In FDMA systems or networks, this comparison is made by scanning different frequencies corresponding to a set of channels. In CDMA systems or networks, the comparison is made by scanning different codes corresponding to different common channels.
Operation 206 If the average RF power levels of the various channels are different, an interference detector 106 of the non-restrictive, illustrative embodiment of the jammer-detecting device detects that the mobile or terminal is victim of cellular interfierence on the common control channel(s).
Detection of the presence of a jammer, in particular but not exclusively a commercial jammer Operation 207 If the average RF power levels of the various channels are similar, the non-restrictive, illustrative embodiment of the jammer-detecting device comprises a jammer detector 107 indicating that the nnobile or terminal is being jammed, that is under the influence of a jammer.
Those of ordinary skill in the art will appreciate that, prior to detecting the presence of a jammer, the non-restrictive illustrative embodiment of the jammer detecting device according to the present invention first determines whether the absence of reception of an intelligible signal by the ceVlular mobile or terminal is caused by either out-of-coverage or interference.
Although the present invention has been described in the foregoing specification by means of a non-restrictive illustrative embodiment thereof, this illustrative embodiment can be modified as will, uvithin the scope of the appended claims without departing from the spirit and nature of the subject invention.
As well known to those of ordinary skill in the art, the predicted noise floor is a function of the mobile or terminal noise figure and the frequency bandwidth of concern.
Operation 203 If the difference between the average power level of the common control channel and the predicted noise floor as determined by the sigrral and noise comparator 102 is lower (for example by 10% lower) than the signal-to-noise ratio required for proper operation of the mobile or terminal plus a certain margin to take into consideration normal co-channel interference, the cellular system or network is then considered as out-of-coverage. This condition is detected by the out-of-coverage detector 103.
The signal-to-noise ratio required far proper operation of the mobile or terminal plus the above-mentioned margin will be referred to as the "threshold" in the following description.
If the difference between the average power level of the common control channel and the predicted noise floor as determined by the signal and noise comparator 102 is higher {for example by 10% higher) than the threshold, the cellular system or network is either jammed or in interference on the common control channel. The procedure then goes to operation 205 in order to perform the discrimination of the common channel interference case.
Operation 204 The first time (104a and 204x) the average power level on the common control channel is compared to the predicted noise floor, the difference between this average power level of the common control channel and the predicted noise floor is approximately equal to the threshold (for example equal to the threshold ~10%), the jammer-detecting device waits for a short period of time generated by the timer 204, for example a few seconds.
After this waiting period, as the difference between the average power level of the common control channel and the predicted noise floor is approximately equal to the threshold, the reception may correctly resume. If not, discrimination of the out-of-coverage case is performE;d a second time with the following result:
- If the difference between the average power level of the common control channel and the predicted noise floor is lower (for example by 10% lower) than the threshold, the out-of-coverage detector 103 detects an out-of-coverage condition of the cellular system or network (Operation 203);
- If the difference between the average power level of the common control channel and the predicted noise floor is higher (for example by 10°/~
higher) than the threshold, the cellular system or network is either jammed or in interference on the common crontrol channel, and the procedure then goes to Operation 205; and - If the difference between the average power le~rel of the common control channel and the predicted noise floor is approximately equal (for example equal to the threshold ~10%) to the threshold as a result of the second (104a and 204a) out-of-coverage discrimination (104a and 204a), the cellular system or network is either jammed or in interference on the common control channels, and the procedure then goes to Operation 205.
Discrimination of the common channei interference case At this stage, the jammer-detecting method end device considers the cellular system or network as being jammed or in cellular interference on the common control channel.
Operation 205 Discrimination of the common channel interference case is conducted by first comparing to each other the respective RF (Radio Frequency) power levels of a random set of channels within the relevant frequency bandwidth. 1'he non-restrictive, illustrative embodiment of the jammer-detecting device comprises a random channels power level scanner 105 for performing this comparison.
In FDMA systems or networks, this comparison is made by scanning different frequencies corresponding to a set of channels. In CDMA systems or networks, the comparison is made by scanning different codes corresponding to different common channels.
Operation 206 If the average RF power levels of the various channels are different, an interference detector 106 of the non-restrictive, illustrative embodiment of the jammer-detecting device detects that the mobile or terminal is victim of cellular interfierence on the common control channel(s).
Detection of the presence of a jammer, in particular but not exclusively a commercial jammer Operation 207 If the average RF power levels of the various channels are similar, the non-restrictive, illustrative embodiment of the jammer-detecting device comprises a jammer detector 107 indicating that the nnobile or terminal is being jammed, that is under the influence of a jammer.
Those of ordinary skill in the art will appreciate that, prior to detecting the presence of a jammer, the non-restrictive illustrative embodiment of the jammer detecting device according to the present invention first determines whether the absence of reception of an intelligible signal by the ceVlular mobile or terminal is caused by either out-of-coverage or interference.
Although the present invention has been described in the foregoing specification by means of a non-restrictive illustrative embodiment thereof, this illustrative embodiment can be modified as will, uvithin the scope of the appended claims without departing from the spirit and nature of the subject invention.
Claims (23)
1. A device for detecting a communication-interfering jammer in the proximity of a communication equipment normally receiving an intelligible signal, comprising:
means for detecting an absence of reception of the intelligible signal by the communication equipment;
means for discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment; and means for detecting a communication-interfering jammer in the proximity of the communication equipment when the discriminating means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
means for detecting an absence of reception of the intelligible signal by the communication equipment;
means for discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment; and means for detecting a communication-interfering jammer in the proximity of the communication equipment when the discriminating means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
2. A method for detecting a communication-interfering yammer in the proximity of a communication equipment normally receiving an intelligible signal, comprising:
detecting an absence of reception of the intelligible signal by the communication equipment;
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at feast one other cause for the absence of reception of the intelligible signal by the communication equipment;
and detecting a communication-interfering jammer in the proximity of the communication equipment when the discrimination indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
detecting an absence of reception of the intelligible signal by the communication equipment;
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from at feast one other cause for the absence of reception of the intelligible signal by the communication equipment;
and detecting a communication-interfering jammer in the proximity of the communication equipment when the discrimination indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
3. A method for detecting a communication-interfering jammer as defined in claim 2, wherein discriminating the detection of a communication-interfering jammer comprises:
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation.
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation.
4. A method for detecting a communication-interfering jammer as defined in claim 2, wherein discriminating the detection of a communication-interfering jammer comprises:
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference.
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference.
5. A method for detecting a communication-interfering jammer as defined in claim 2, wherein the communication equipment comprises at least one common control channel and wherein discriminating the detection of a communication-interfering jammer comprises:
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference on said at least one common control channel.
discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference on said at least one common control channel.
6. A method for detecting a communication-interfering jammer as defined in claim 3, wherein the communication equipment comprises at least one common control channel, and wherein discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation comprises:
comparing an average power level on the common control channel of the communication equipment with a predicted noise floor.
comparing an average power level on the common control channel of the communication equipment with a predicted noise floor.
7. A method for detecting a communication-interfering jammer as defined in claim 6, wherein discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation comprises:
detecting an out-of-coverage situation when the comparison between the average power level and the predicted noise floor indicates than a difference between said average power level and said predicted noise floor is lower than a given threshold.
detecting an out-of-coverage situation when the comparison between the average power level and the predicted noise floor indicates than a difference between said average power level and said predicted noise floor is lower than a given threshold.
8. A method for detecting a communication-interfering jammer as defined in claim 6, wherein, when the comparison between the average power level and the predicted noise floor indicates that a difference between said average power level and said predicted noise floor is higher than a given threshold, discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation comprises:
detecting either a communication-interfering jammer in the proximity of the communication equipment or a situation of interference on the common control channel.
detecting either a communication-interfering jammer in the proximity of the communication equipment or a situation of interference on the common control channel.
9. A method for detecting a communication-interfering jammer as defined in claim 6, wherein, when the comparison of the average power level with the predicted noise floor indicates that the difference between said average power level and said predicted noise floor is approximately equal to a given threshold, discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from an out-of-coverage situation comprises:
waiting for a short period of time;
after said short period of time has elapsed, detecting whether there is still an absence of reception of the intelligible signal by the communication equipment; and in the absence of reception of the intelligible signal by the communication equipment, repeating said comparison of the average power level on the common control channel of the communication equipment with the predicted noise floor.
waiting for a short period of time;
after said short period of time has elapsed, detecting whether there is still an absence of reception of the intelligible signal by the communication equipment; and in the absence of reception of the intelligible signal by the communication equipment, repeating said comparison of the average power level on the common control channel of the communication equipment with the predicted noise floor.
10. A method for detecting a communication-interfering jammer as defined in claim 3, wherein the communication equipment comprises a set of channels, and wherein discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference comprises:
comparing to each other power levels of at least a portion of the channels of said set.
comparing to each other power levels of at least a portion of the channels of said set.
11. A method for detecting a communication-interfering jammer as defined in claim 10, wherein discriminating the detection of a communication-interfering jammer in the proximity of the communication equipment from a situation of interference further comprises:
detecting a situation of interference when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are different from each other.
detecting a situation of interference when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are different from each other.
12. A method for detecting a communication-interfering jammer as defined in claim 10, wherein detecting a communication-interfering jammer in the proximity of the communication equipment comprises:
detecting a communication-interfering jammer in the proximity of the communication equipment when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are similar to each other.
detecting a communication-interfering jammer in the proximity of the communication equipment when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are similar to each other.
13. A device for detecting a communication-interfering jammer in the proximity of a communication equipment normally receiving an intelligible signal, comprising:
a detector of an absence of reception of the intelligible signal by the communication equipment;
a discriminator of the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment; and a detector of a communication-interfering jammer in the proximity of the communication equipment when the discrimination means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
a detector of an absence of reception of the intelligible signal by the communication equipment;
a discriminator of the detection of a communication-interfering jammer in the proximity of the communication equipment from at least one other cause for the absence of reception of the intelligible signal by the communication equipment; and a detector of a communication-interfering jammer in the proximity of the communication equipment when the discrimination means indicates that there exists no other cause for the absence of reception of the intelligible signal by the communication equipment.
14. A device for detecting a communication-interfering jammer as defined in claim 13, wherein the discriminator comprises:
a detector of an out-of-coverage situation, the out-of-coverage situation constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
a detector of an out-of-coverage situation, the out-of-coverage situation constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
15. A device for detecting a communication-interfering jammer as defined in claim 13, wherein the discriminator comprises:
a detector of a situation of interference, said situation of interference constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
a detector of a situation of interference, said situation of interference constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
16. A device for detecting a communication-interfering jammer as defined in claim 13, wherein the communication equipment comprises at least one common control channel and wherein the discriminator comprises:
a detector of a situation of interference on the common control channel, said situation of interference on the common control channel constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
a detector of a situation of interference on the common control channel, said situation of interference on the common control channel constituting said at least one other cause for the absence of reception of the intelligible signal by the communication equipment.
17. A device for detecting a communication-interfering jammer as defined in claim 14, wherein the communication equipment comprises at least one common control channel, and wherein the discriminator further comprises:
a comparator of an average power level on the common control channel of the communication equipment with a predicted noise floor.
a comparator of an average power level on the common control channel of the communication equipment with a predicted noise floor.
18. A device for detecting a communication-interfering jammer as defined in claim 17, wherein the detector an out-of-coverage situation comprises:
means for detecting an out-of coverage situation when the comparison between the average power level and the predicted noise floor indicates that a difference between said average power level and sand predicted noise floor is lower than a given threshold.
means for detecting an out-of coverage situation when the comparison between the average power level and the predicted noise floor indicates that a difference between said average power level and sand predicted noise floor is lower than a given threshold.
19. A device for detecting a communication-interfering jammer as defined in claim 17, wherein the discriminator comprises means for detecting, when the comparison between the average power level and the predicted noise floor indicates that a difference between said average power level and said predicted noise floor is higher than a given threshold, either a communication-interfering jammer in the proximity of the communication equipment or a situation of interference on the common control channel.
20. A device for detecting a communication-interfering jammer as defined in claim 17, wherein the discriminator comprises, when the comparison between the average power level and the predicted noise floor indicates that the difference between said average power level and said predicted noise floor is approximately equal to a given threshold:
a timer for generating a short period of time;
the detector of an absence of reception comprises means for detecting, after said short period of time has elapsed, whether there is still an absence of reception of the intelligible signal by the communication equipment; and the comparator comprises means for repeating, in the absence of reception of the intelligible signal by the communication equipment, the comparison of the average power level on the common control channel of the communication equipment with the predicted noise floor.
a timer for generating a short period of time;
the detector of an absence of reception comprises means for detecting, after said short period of time has elapsed, whether there is still an absence of reception of the intelligible signal by the communication equipment; and the comparator comprises means for repeating, in the absence of reception of the intelligible signal by the communication equipment, the comparison of the average power level on the common control channel of the communication equipment with the predicted noise floor.
21. A device for detecting a communication-interfering jammer as defined in claim 15, wherein the communication equipment comprises a set of channels, and wherein the discriminator comprises:
a comparator of power levels of at least a portion of the channels of said set to each other.
a comparator of power levels of at least a portion of the channels of said set to each other.
22. A device for detecting a communication-interfering jammer as defined in claim 21, wherein the discriminator comprises:
a detector of a situation of interference when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are different from each other.
a detector of a situation of interference when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are different from each other.
23. A device for detecting a communication-interfering jammer as defined in claim 21, wherein the detector of a communication-interfering jammer in the proximity of the communication equipment comprises:
means for detecting a communication-interfering jammer in the proximity of the communication equipment when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are similar to each other.
means for detecting a communication-interfering jammer in the proximity of the communication equipment when the comparison of the power levels indicate that the power levels of said at least a portion of the channels are similar to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2433242 CA2433242A1 (en) | 2002-07-03 | 2003-06-25 | Detector of commercial jammer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002392326A CA2392326A1 (en) | 2002-07-03 | 2002-07-03 | Monitoring system and method |
| CA2,392,326 | 2002-07-03 | ||
| CA 2433242 CA2433242A1 (en) | 2002-07-03 | 2003-06-25 | Detector of commercial jammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2433242A1 true CA2433242A1 (en) | 2004-01-03 |
Family
ID=30771628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2433242 Abandoned CA2433242A1 (en) | 2002-07-03 | 2003-06-25 | Detector of commercial jammer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2433242A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1926242A1 (en) * | 2006-11-23 | 2008-05-28 | Vodafone Group PLC | Method for detecting the use of radio frequency signal inhibitors in wireless communications systems |
| WO2012066053A1 (en) * | 2010-11-16 | 2012-05-24 | Cinterion Wireless Modules Gmbh | Method of detecting a loss of service availability, in particular a jamming transmitter and/or an out of service situation, affecting a communication user equipment, user equipment and evaluation unit with interfaces to the user equipment |
| EP2632068A1 (en) * | 2012-02-24 | 2013-08-28 | Gemalto M2M GmbH | Method of detecting a jamming transmitter affecting a communication user equipment and system, user equipment and communication module |
| EP3522130A1 (en) * | 2018-02-02 | 2019-08-07 | Verisure Sàrl | A method and a system for early detecting jamming of intruder alarm systems |
| CN113466591A (en) * | 2021-07-05 | 2021-10-01 | 北方通用电子集团有限公司 | Automatic test system of multifunctional electronic jammer |
-
2003
- 2003-06-25 CA CA 2433242 patent/CA2433242A1/en not_active Abandoned
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2321256A1 (en) * | 2006-11-23 | 2009-06-03 | Vodafone España, S.A. | Method for detecting the use of radio frequency signal inhibitors in wireless communications systems |
| EP1926242A1 (en) * | 2006-11-23 | 2008-05-28 | Vodafone Group PLC | Method for detecting the use of radio frequency signal inhibitors in wireless communications systems |
| US9198062B2 (en) | 2010-11-16 | 2015-11-24 | Gemalto M2M Gmbh | Method of detecting a loss of service availability, in particular a jamming transmitter and/or an out of service situation, affecting a communication user equipment, user equipment and evaluation unit with interfaces to the user equipment |
| WO2012066053A1 (en) * | 2010-11-16 | 2012-05-24 | Cinterion Wireless Modules Gmbh | Method of detecting a loss of service availability, in particular a jamming transmitter and/or an out of service situation, affecting a communication user equipment, user equipment and evaluation unit with interfaces to the user equipment |
| CN103299552A (en) * | 2010-11-16 | 2013-09-11 | 辛特里昂无线电模块有限责任公司 | Method of detecting a loss of service availability, in particular a jamming transmitter and/or an out of service situation, affecting a communication user equipment, user equipment and evaluation unit with interfaces to the user equipment |
| US9198063B2 (en) | 2010-11-16 | 2015-11-24 | Gemalto M2M Gmbh | Method of detecting a jamming transmitter affecting a communication user equipment, user equipment and evaluation unit with interfaces to the user equipment |
| CN103299552B (en) * | 2010-11-16 | 2015-05-13 | 金雅拓M2M有限责任公司 | Method of detecting a loss of service availability, user equipment and evaluation unit |
| EP2632068A1 (en) * | 2012-02-24 | 2013-08-28 | Gemalto M2M GmbH | Method of detecting a jamming transmitter affecting a communication user equipment and system, user equipment and communication module |
| CN103441804A (en) * | 2012-02-24 | 2013-12-11 | 辛特里昂无线电模块有限责任公司 | Method of detecting a jamming transmitter, system, user equipment and communication module |
| CN103441804B (en) * | 2012-02-24 | 2017-04-26 | 辛特里昂无线电模块有限责任公司 | Method of detecting a jamming transmitter, system, user equipment and communication module |
| EP3522130A1 (en) * | 2018-02-02 | 2019-08-07 | Verisure Sàrl | A method and a system for early detecting jamming of intruder alarm systems |
| WO2019149415A1 (en) * | 2018-02-02 | 2019-08-08 | Verisure Sàrl | A method and a system for early detecting jamming of intruder alarm systems |
| CN113466591A (en) * | 2021-07-05 | 2021-10-01 | 北方通用电子集团有限公司 | Automatic test system of multifunctional electronic jammer |
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