CN112422203B - MSK decoding sensitivity accurate test method applied to interrogator - Google Patents
MSK decoding sensitivity accurate test method applied to interrogator Download PDFInfo
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- CN112422203B CN112422203B CN202011226862.8A CN202011226862A CN112422203B CN 112422203 B CN112422203 B CN 112422203B CN 202011226862 A CN202011226862 A CN 202011226862A CN 112422203 B CN112422203 B CN 112422203B
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Abstract
The invention discloses a method for accurately testing MSK decoding sensitivity applied to an interrogator, which is characterized by comprising the following steps: determining a test instrument; determining a test connection block diagram according to an instrument; expressing key parameters and limits of the device to be tested and the testing instrument and the limits of the connection block diagram through a formula; determining attenuation values of all positions in the test connection block diagram; compiling a test step; testing the MSK decoding sensitivity according to the testing steps; the testing method of the invention constructs a testing platform by performing formulaic calculation on the parameters of the equipment to be tested and the testing instrument, and then accurately calculates the MSK decoding sensitivity of the equipment to be tested; by the test method, various test objects can be detected, so that the test objects are complete; through calculation of each formula, the obtained test result is more accurate and comprehensive, and the error of the test result is effectively reduced.
Description
Technical Field
The invention relates to the field of interrogators, in particular to an MSK decoding sensitivity accurate testing method applied to an interrogator.
Background
The interrogator sends an interrogation signal to the responder, the responder replies a response signal after receiving the interrogation signal, and the interrogator receives the response signal and decodes the response signal to obtain information such as codes, heights, positions and the like and form a point track.
The interrogator has three modulation modes: ASK, DPSK and MSK. The ASK decoding sensitivity and the DPSK decoding sensitivity can be directly tested by a special tester; MSK is the existing latest modulation mode, and no special tester can directly test the MSK decoding sensitivity of the interrogator (when the interrogator is in the MSK operating mode, the sigma-channel decoding probability is not lower than 90%, the minimum amplitude of the response signal is the MSK decoding sensitivity).
In the MSK working mode, the inquiry signal of the inquiry machine is encrypted, the coding time changes, and the response signal is required to change along with the change of the inquiry signal so as to be decoded, and the analog response signal compiled by the general instrument cannot change along with the change of the response signal, so that the general instrument cannot directly test the MSK decoding sensitivity parameter of the inquiry machine.
After the special test instrument, namely the response simulator loads the same group of passwords as the inquiry machine, the response simulator receives the sigma-channel inquiry signal of the inquiry machine, generates a corresponding response signal and outputs the response signal to the sigma-channel of the inquiry machine for decoding. However, the dynamic range of the response simulator receiver is small, the amplitude of the response signal is a fixed value, the response simulator receiver is mainly used for function testing, and MSK decoding sensitivity parameters of an interrogator cannot be directly tested.
The existing test method mainly uses a signal source to simulate a front leader of an MSK response signal, and replaces MSK decoding sensitivity with the decoding sensitivity of an interrogator to the front leader of the MSK response signal; the complete MSK response signal comprises a leading pulse train and data, the existing method only tests a certain pulse of the leading pulse train, only partially, important data decoding is not involved at all, and a test object is incomplete; the MSK response signal changes constantly along with time, the code of the leader is fixed, the test value is generally superior to the actual MSK decoding sensitivity, and the test is inaccurate; because the tested objects are incomplete and the signals are lack of change, the method has no meaning even if a testing instrument with higher precision is adopted and the test is not accurate; the "decoding" of the MSK decoding sensitivity parameters actually includes a decryption function, to which only one pulse of the leading header is tested, too one side.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the MSK decoding sensitivity accurate testing method applied to the interrogator is provided; the invention solves the problem that the MSK decoding sensitivity test object is incomplete; the problem that the test result is not accurate is solved; the problem of testing the content one side is also solved.
The technical scheme adopted by the invention is as follows:
an MSK decoding sensitivity accurate test method applied to an interrogator is characterized by comprising the following steps: determining a test instrument; determining a test connection block diagram according to an instrument; expressing key parameters and limits of the device to be tested and the testing instrument and the limits of the connection block diagram through a formula; determining attenuation values of all positions in the test connection block diagram; a test programming step; the MSK decoding sensitivity is tested according to the test steps.
Further, the test instrument comprises a response simulator, a circulator, a variable attenuator, a fixed attenuator, a peak power meter and a network analyzer.
Further, the test connection block diagram includes: the device comprises an interrogator interrogation signal path, a response simulator response signal path, an interrogator channel load path, a power supply path and a display control path.
Further, the interrogator interrogation signal path includes: the interrogator, the circulator A, the attenuation A and the response simulator are connected in sequence;
the answer simulator answer signal path includes: the device comprises a response simulator, a circulator B, an attenuation B, a variable attenuator, an attenuation C, a circulator A and an interrogator, wherein the response simulator, the circulator B, the attenuation B, the variable attenuator, the attenuation C, the circulator A and the interrogator are connected in sequence; the interrogator channel load path comprises an interrogator and an attenuation D, and the attenuation D is connected with the interrogator;
the power supply path comprises power supply equipment and an interrogator, and the power supply equipment is connected with the interrogator;
the display control path comprises a display controller and an interrogator, and the display controller is connected with the interrogator.
Furthermore, the inquiry signal path of the inquiry machine also comprises a password loader which is respectively connected with the inquiry machine and the response simulator
Further, the formula includes:
in the interrogation signal path of the interrogator, the normal signal amplitude P1-L1 received by the response simulator from the interrogation signal path should be the optimal receiving amplitude P' 2, and the formula can be obtained: P1-L1 e [ -20, — 10];
the amplitude of the interference signal received by the response simulator from the response signal path is as follows: (P1-20-L3-L4-L2) -20; the interfering signal amplitude should be 9dB below the normal signal amplitude: [ (P1-20-L3-L4-L2) -20 ]. Ltoreq.P 1-L1) -9, the formula is obtained: l2+ L3+ L4 is more than or equal to L1-31;
the power P1-20-L3 received by the variable attenuator after being attenuated by C should be lower than the acceptable power by 30dBmW, and the formula can be obtained: P1-L3 is less than or equal to 50;
in the response signal path of the response simulator, the normal signal amplitude received by the interrogator from the response signal path is P2-L2-L4-L3, the decoding sensitivity P' 1 of the interrogator MSK can be measured by adjusting the value of the variable attenuator L4, and the formula can be obtained: p' 1 belongs to P2-L2-L4-L3;
the amplitude of the interference signal received by the interrogator from the interrogation signal path is: (P2-20-L1) -20; the interfering signal amplitude should be 9dB below the normal signal amplitude: [ (P2-20-L1) -20] ≦ (P2-L2-L4-L3) -9, the formula can be found: l2+ L3+ L4 is less than or equal to L1+31;
the power P2-L2 received by the variable attenuator through the attenuation B should be lower than the tolerable power by 30dBmW, and the formula can be obtained: P2-L2 is less than or equal to 30;
by adjusting the range of 0-81 dB and stepping by 0.1dB through the variable attenuator, the formula can be obtained: l4 ∈ [0, 81]; wherein L4 is an integer multiple of 0.1 dB;
responding peak power P2 through a response simulator, wherein the range of P2 is 12 dBmW-18 dBmW, and a formula can be obtained: p2 ∈ [12, 18];
by fixing the nominal values of the attenuators 10dB, 20dB, 30dB, 40dB, the attenuators a, B, C, D can be selected from the above-mentioned fixed attenuators or combinations, and the formula can be obtained: { attenuation A, attenuation B, attenuation C, attenuation D }, belongs to {10n1, 10n2, 10n3, 10n4}; wherein n1, n2, n3 and n4 are natural numbers.
Further, the method for determining the attenuation value of each position in the test connection block diagram comprises the following steps: substituting the peak power P1 of the sigma channel and the omega channel of the query machine to be tested and the decoding sensitivity P' 1 range of the sigma channel into a formula to determine attenuators or attenuator combinations to be connected for attenuation A, attenuation B, attenuation C and attenuation D in the test connection block diagram; determining the adjustment range of the variable attenuator after being limited by a formula; and verifying whether the sensitivity test range can cover the sigma-channel decoding sensitivity P' 1 range of the device to be tested under the test connection block diagram.
Further, the programming test step includes: building a test platform according to the calculation result of the attenuation value of each position in the test connection block diagram, setting the distance of a response simulator as the maximum detection distance of the interrogator to be tested, and starting an MSK working mode; controlling an interrogator to send an MSK interrogation signal; reducing the resistance value of the variable attenuator by 0.1dB step from the upper limit of the adjustment range of the variable attenuator, and observing the decoding probability value of the interrogator; when the decoding probability value is stable to be 90%, recording the variable attenuator value Y1, and then controlling the interrogator to stop transmitting; loosening a joint between the radio frequency cable A and the variable attenuator, connecting the peak power meter, controlling the interrogator to send an MSK interrogation signal, recording a power value P4 of the peak power meter, and then controlling the interrogator to stop transmitting; powering off all equipment, loosening a joint between a radio-frequency cable B and a variable attenuator, loosening a joint between a radio-frequency cable C and an interrogator, and testing line loss between a loose end of the radio-frequency cable B and a loose end of the radio-frequency cable C at a frequency point of 1090MHz by using a network analyzer, wherein the line loss is marked as Y2; the MSK decoding sensitivity of the interrogator is P' 1= (P4-Y1-Y2), and the result is recorded; if P' 1 is in the preset range, it is qualified.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention can detect various test objects through the test method of the invention, so that the test objects are more complete.
2. According to the invention, through calculation of each formula, the obtained test result is more accurate and comprehensive, and the error of the test result is effectively reduced.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of a method for accurately testing the MSK decoding sensitivity of an interrogator.
Fig. 2 is a block diagram of a test connection.
Fig. 3 is a flow chart of an interrogation signal.
Fig. 4 is a flow chart of the reply signal.
FIG. 5 is a flow chart of programming test steps.
FIG. 6 is a schematic block diagram of a power test.
Fig. 7 is a schematic block diagram of a line loss test.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
An MSK decoding sensitivity accurate test method applied to an interrogator is characterized by comprising the following steps:
s1: a test instrument is determined.
In the above steps, the test instrument includes a response simulator, a circulator, a variable attenuator, a fixed attenuator, a peak power meter and a network analyzer.
In MSK mode, the inquiry signal of the inquiry machine is encrypted, the coding time changes, and the answer signal is required to change with the change, but the analog answer signal programmed by the general instrument can not change with the change, so that only a special test instrument, namely the answer simulator, can be selected to test the MSK decoding sensitivity parameter of the inquiry machine.
The interrogators are provided with sigma and omega radio frequency channels, wherein the sigma channel is a main interrogation receiving channel, and the omega channel is used for side lobe suppression; the response simulator is a single radio frequency channel, firstly receives a sigma-channel query signal of the interrogator, then generates a corresponding response signal, and outputs the response signal to the sigma-channel of the interrogator for decoding. When the interrogator is in an MSK working mode and the sigma-channel decoding probability is not lower than 90%, the minimum amplitude of the response signal is the MSK decoding sensitivity;
the circulator and the attenuator are used for separating an interrogation signal path from a response signal path; the dynamic range of the response simulator receiver is small, the amplitude of the response signal is a fixed value, if the attenuator is directly connected with the sigma-channel of the inquiry machine, and the amplitude of the response signal is reduced to the decoding sensitivity by adding the attenuator, the condition that the inquiry signal after the same attenuation exceeds the dynamic range of the response simulator receiver easily occurs, so a circulator and the attenuator are needed to separate an inquiry signal path from a response signal path.
The response simulator receiver has a small dynamic range and requires the addition of a suitable fixed attenuator in the interrogation signal path to keep the interrogation signal received by the response simulator within its optimum received amplitude range.
The response signal amplitude of the response simulator is a fixed value, and a variable attenuator is required to be added on a response signal channel to accurately test the decoding sensitivity parameters of the interrogator; the common variable attenuator can bear low power, the isolation degree of the common circulator is only 20dB, and in order to protect the variable attenuator, a fixed attenuator which can bear high power must be added at two ends of the variable attenuator.
When the interrogation machine transmits an interrogation signal in the sigma channel, the omega channel simultaneously transmits an interrogation sidelobe suppression signal; when the Σ channel receives the response signal, the Ω channel simultaneously receives the response signal for reception side lobe suppression, and in order to avoid interference with the Σ channel, an appropriate fixed attenuator must be added as a load.
The peak power meter is used for power testing, and the network analyzer is used for line loss testing.
S2: and determining a test connection block diagram according to the instrument.
In the above step, as shown in fig. 2, the test connection block diagram includes: an interrogator interrogation signal path, a response simulator response signal path, an interrogator channel load path, a power supply path, and a display control path.
The interrogator interrogation signal path includes: the system comprises an interrogator, a circulator A, an attenuation A and a response simulator, wherein the interrogator, the circulator A, the attenuation A and the response simulator are sequentially connected; the circulator A and the circulator B respectively comprise 3 pins, namely a circulator A1 pin, a circulator A2 pin, a circulator A3 pin, a circulator B1 pin, a circulator B2 pin and a circulator B3 pin; a sigma channel of the interrogator is connected with a pin A2 of the circulator, a pin A3 of the circulator is connected with the attenuation A, the attenuation A is connected with a pin B1 of the circulator, and a pin B2 of the circulator is connected with the response simulator; the signal transmission path is as follows: the interrogator Σ channel → "circulator a"2 feet → "circulator a"3 feet → "attenuation a" → "circulator a"1 feet → "circulator a"2 feet → the transponder simulator.
The answer simulator answer signal path includes: the device comprises a response simulator, a circulator B, an attenuation B, a variable attenuator, an attenuation C, a circulator A and an interrogator, wherein the response simulator, the circulator B, the attenuation B, the variable attenuator, the attenuation C, the circulator A and the interrogator are sequentially connected; the response simulator is connected with a pin B2 of the circulator, a pin B3 of the circulator is connected with an attenuation B, the attenuation B is connected with an attenuation C through a variable attenuator, the attenuation C is connected with a pin A1 of the circulator, and a pin A2 of the circulator is connected with a sigma-shaped channel of the interrogator; the signal transmission path is as follows: the response simulator → "circulator B"2 feet → "circulator B"3 feet → "attenuation B" → "variable attenuator" → "attenuation C" → "circulator a"1 feet → "circulator a"2 feet → the interrogator Σ channel.
The interrogator channel load path comprises an interrogator and an attenuation D, and the attenuation D is connected with the interrogator; the power supply path includes a power supply device and an interrogator, and the power supply device is connected to the interrogator.
In order to control the interrogator to interrogate in the MSK operating mode and simultaneously display the sigma-channel decoding probability value of the interrogator in the MSK operating mode, a display control path needs to be provided, where the display control path includes a display controller and the interrogator, and the display controller is connected to the interrogator.
When the response simulator and the interrogator work in an MSK mode and load the same group of passwords, the response simulator can decode the encrypted inquiry signal and generate a corresponding encrypted response signal; the interrogator can decode the encrypted response signal; therefore, the inquiry signal path of the inquiry machine also comprises a password loader which is respectively connected with the inquiry machine and the response simulator.
S3: the key parameters and limits of the device to be tested and the testing instrument and the limits of the connection block diagram are expressed by formulas.
In the above steps, the isolation of the circulator in the interrogation signal path of the interrogator is only 20dB, so that besides the normal interrogation signal path, there may also occur the situation that the interrogation signal "flows back" in the response signal path, and the flow chart of the interrogation signal is as shown in fig. 3: "circulator a"2 feet → "circulator a"1 feet → "attenuation C" → "variable attenuator" → "attenuation B" → "circulator B"3 feet.
The normal signal amplitude (P1-L1) received by the reply simulator from the interrogation signal path, preferably the optimum received amplitude P' 2 (in the range-20 dBmW to-10 dBmW), yields equation (1):
P1-L1∈[―20，―10] ①
the amplitude of the interference signal received by the response simulator from the response signal path is as follows: (P1-20-L3-L4-L2) -20; wherein 20 is a circulator isolation value; the interfering signal amplitude should be at least 9dB below the normal signal amplitude: [ (P1-20-L3-L4-L2) -20 ]. Ltoreq.p 1-L1) -9, to give the formula (2):
L2+L3+L4≥L1-31 ②
the power received by the variable attenuator through the "attenuation C" (P1-20-L3) should be lower than the acceptable power by 30dBmW, and the formula (3) can be obtained:
P1-L3≤50 ③
then, key parameters and limits of the equipment to be tested and the test instrument in the response signal flow and the limits of the connection block diagram are expressed by formulas;
in the answer signal path of the answer simulator, the isolation of the circulator is only 20dB, so besides the normal answer signal path, the situation that the answer signal "flows back" in the inquiry signal path can also occur, and the flow chart of the answer signal is as shown in fig. 4: "circulator B"2 feet → "circulator B"1 feet → "attenuation A" → "circulator A"3 feet.
The normal signal amplitude (P2-L2-L4-L3) received by the interrogator from the response signal path can be measured by adjusting the value of L4 to obtain the decoding sensitivity P' 1 of the interrogator MSK, and the formula (4) can be obtained:
P`1∈P2-L2-L4-L3 ④
the amplitude of the interference signal received by the interrogator from the interrogation signal path is: (P2-20-L1) -20 (circulator isolation); the interfering signal amplitude should be at least 9dB below the normal signal amplitude: [ (P2-20-L1) -20] ≦ (P2-L2-L4-L3) -9, giving the formula (5):
L2+L3+L4≤L1+31 ⑤
the power received by the variable attenuator through "attenuation B" (P2-L2) should be 30dBmW lower than the acceptable received power, and equation (6) can be obtained:
P2-L2≤30 ⑥
the adjusting range of the variable attenuator is 0-81 dB, and the step is 0.1 dB), the formula (7) can be obtained:
L4∈[0，81] ⑦
wherein L4 is an integral multiple of 0.1 dB.
In this embodiment, a response simulator of a certain type is used for example, and the response peak power P2 (in the range of 12dBmW to 18 dBmW) can be obtained as formula (8):
P2∈[12，18] ⑧
the general fixed attenuators can bear high power, and the most general fixed attenuators are generally 10dB, 20dB, 30dB and 40dB in nominal value. The attenuation A, the attenuation B, the attenuation C and the attenuation D can be selected from proper fixed attenuators or a combination, and the formula (9) can be obtained:
{ attenuation A, attenuation B, attenuation C, attenuation D }. Epsilon {10n1, 10n2, 10n3, 10n4} (9)
Wherein n1, n2, n3 and n4 are natural numbers.
S4: attenuation values for various locations in the test connection block diagram are determined.
In this embodiment, taking a model interrogator as an example, peak power P1 of a sigma-channel and an omega-channel is about 61dBmW, and decoding sensitivity P' 1 of the sigma-channel is in a range of [ -90 dBmW, — 80dBmW ];
p1=61 in combination with formula (1): P1-L1 ∈ [ -20, — 10] can be obtained: l1 is more than or equal to 71 and less than or equal to 81, and L1 can be determined to be 80dB by combining the formula (9);
p1=61 in combination with formula (3): P1-L3 is less than or equal to 50, and can be obtained: l3 is more than or equal to 11, in order to reduce the influence on the test circuit, a fixed attenuator with small attenuation is selected as much as possible, and the L3 can be determined to be 20dB by combining the formula (9);
l1=80, L3=20 in combination with formula (2): l1-34 can be obtained when L2+ L3+ L4 is not less than L2: l2+ L4 is more than or equal to 26, in order to reduce the influence on the test circuit, a fixed attenuator with small attenuation is selected as much as possible, and the L2 can be determined to be 30dB by combining the formulas (7) and (9);
substituting L2=30, equation (8) into the left end of equation (6) yields: P2-L2 ∈ [ -18, -12], meets the requirement ≦ 30, so L2=30 meets the requirement of equation (6);
substituting L2=30, L3=20, L1=80, equation (7) into equation (5) yields: l4 is less than or equal to 61, namely the actual range of L4 is smaller than the formula (7), and L4 belongs to [0,61];
substituting L3=20, L2=30, L4 ∈ [0,61], equation (8) into the right end of equation (4) yields: the sensitivity range (P2-L2-L4-L3) = (P2-40-L4) ∈ [ -93, -38] of the interrogator which can be tested by the test connection block diagram completely covers the sigma-channel decoding sensitivity P' 1= [ -90, — -80 ], so that L1=80, L3=20 and L2=30 meet the requirement of formula (4);
therefore, the attenuation at each position in the test connection block diagram is determined by combining the formulas (1), (2), (3), (4), (5), (6), (7), (8) and (9): attenuation A can select two attenuators with the nominal value of 40dB to be connected in series; attenuation B selects an attenuator with a nominal value of 30dB; attenuation C selects an attenuator with a nominal value of 20dB; when the attenuation D is equivalent to the attenuation A, the sensitivity test is not influenced, two attenuators with the nominal value of 40dB can be selected to be connected in series, and a test connection block diagram is determined as shown in FIG. 6.
S5: and programming a testing step.
In the above steps, the programming test step is shown in fig. 5, and includes: connecting each device, powering on the device, setting the distance of the response simulator as the maximum detection distance of the interrogator to be detected, and starting the MSK working mode; controlling an interrogator to send an MSK interrogation signal; reducing the resistance of the variable attenuator by 0.1dB step from 61dB, and observing the decoding probability value of the interrogator; when the decoding probability value is stable to be 90%, recording the variable attenuator value Y1, and then controlling the interrogator to stop transmitting; loosening the joint between the radio frequency cable A and the variable attenuator, connecting the peak power meter, controlling the interrogator to send an MSK interrogation signal, recording the power value P4 of the peak power meter, and then controlling the interrogator to stop transmitting, as shown in FIG. 6; powering off all equipment, loosening a joint between the radio-frequency cable B and the variable attenuator, loosening a joint between the radio-frequency cable C and the interrogator, and testing line loss between a loose end of the radio-frequency cable B and a loose end of the radio-frequency cable C at a frequency point of 1090MHz by using a network analyzer, wherein the line loss is marked as Y2, and the line loss is shown in figure 7; the MSK decoding sensitivity of the interrogator is P' 1= (P4-Y1-Y2), and the result is recorded; if the P' 1 is in the range of [ -90 dBmW, — 80dBmW ], the product is qualified.
S6: the MSK decoding sensitivity is tested according to the test steps.
In the above steps, a certain sample set of the above-mentioned type of inquiry machine is selected for example, and the sample set is tested according to the test steps, wherein the test value of the variable attenuator value Y1 is 47.4dB; the power P4 test value of the peak power meter is-15.46 dBmW; the test value of the attenuation Y2 is 22.27dB, P' 1= (-15.46-47.4-22.27) = -85.13dBmW can be calculated, statistics is carried out according to 0.1dB of the variable attenuator with the lowest precision, and the MSK decoding sensitivity of the set of the interrogator is-85.1 dBmW; after verification thereof, -85.1dBmW is in the range of [ -90 dBmW, -80 dBmW ].
In the embodiment, only one type of the inquiry machine is selected for testing, and in other types, as long as the peak power of the sigma/omega channel and the approximate range of the MSK decoding sensitivity of the sigma channel are provided, the testing can be performed according to the method disclosed by the invention; the characteristic parameters of the selected test instruments such as the response simulator, the variable attenuator, the circulator and the like are only an example, and the formula of the invention is changed along with the change of the characteristic parameters.
The testing method of the invention constructs a testing platform by performing formulaic calculation on the parameters of the equipment to be tested and the testing instrument, and then accurately calculates the MSK decoding sensitivity of the equipment to be tested; by the test method, various test objects can be detected, so that the test objects are complete; through calculation of each formula, the obtained test result is more accurate and comprehensive, and the error of the test result is effectively reduced.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.
Claims (3)
1. An MSK decoding sensitivity accurate test method applied to an interrogator is characterized by comprising the following steps: determining a test instrument; determining a test connection block diagram according to an instrument; expressing key parameters and limits of the device to be tested and the testing instrument and the limits of the connection block diagram through a formula; determining attenuation values of all positions in the test connection block diagram; compiling a test step; testing the MSK decoding sensitivity according to the testing steps;
the test instrument comprises a response simulator, a circulator, a variable attenuator, a fixed attenuator, a peak power meter and a network analyzer;
the test connection block diagram comprises: the device comprises an interrogator interrogation signal path, a response simulator response signal path, an interrogator channel load path, a power supply path and a display control path;
the interrogator interrogation signal path includes: the interrogator, the circulator A, the circulator B, the attenuator A and the response simulator are connected in sequence;
the answer simulator answer signal path includes: the device comprises a response simulator, a circulator B, an attenuator B, a variable attenuator, an attenuator C, a circulator A and an interrogator, wherein the response simulator, the circulator B, the attenuator B, the variable attenuator, the attenuator C, the circulator A and the interrogator are connected in sequence;
the interrogator channel load path comprises an interrogator and an attenuator D, and the attenuator D is connected with the interrogator;
the power supply path comprises power supply equipment and an interrogator, and the power supply equipment is connected with the interrogator;
the display control path comprises a display controller and an interrogator, and the display controller is connected with the interrogator;
the meaning of the formula includes:
in the interrogation signal path of the interrogator, the normal signal amplitude P1-L1 received by the response simulator from the interrogation signal path should be the optimal receiving amplitude P' 2, and the formula can be obtained: P1-L1 e [ -20, — 10]; p1 is the peak power of the sigma channel and the omega channel of the inquiry machine to be tested;
the amplitude of the interference signal received by the response simulator from the response signal path is as follows: (P1-20-L3-L4-L2) -20; the interfering signal amplitude should be 9dB below the normal signal amplitude: [ (P1-20-L3-L4-L2) -20 ]. Ltoreq.P 1-L1) -9, the formula is obtained: l2+ L3+ L4 is more than or equal to L1-31;
the power P1-20-L3 received by the variable attenuator through the attenuator C should be lower than the tolerable power of 30dBmW, and the formula can be obtained: P1-L3 is less than or equal to 50;
in the response signal path of the response simulator, the normal signal amplitude received by the interrogator from the response signal path is P2-L2-L4-L3, the decoding sensitivity P' 1 of the interrogator MSK can be measured by adjusting the value of the variable attenuator L4, and the formula can be obtained: p' 1 belongs to P2-L2-L4-L3;
the amplitude of the interference signal received by the interrogator from the interrogation signal path is: (P2-20-L1) -20; the interfering signal amplitude should be 9dB below the normal signal amplitude: [ (P2-20-L1) -20] ≦ (P2-L2-L4-L3) -9, giving the formula: l2+ L3+ L4 is less than or equal to L1+31;
the power P2-L2 received by the variable attenuator through the attenuator B should be lower than the tolerable power by 30dBmW, and the formula can be obtained: P2-L2 is less than or equal to 30;
by adjusting the range of 0-81 dB and stepping by 0.1dB through the variable attenuator, the formula can be obtained: l4 ∈ [0, 81]; wherein L4 is an integer multiple of 0.1 dB;
responding peak power P2 through a response simulator, wherein the range of P2 is 12 dBmW-18 dBmW, and obtaining a formula: p2 ∈ [12, 18];
by fixing the nominal values of the attenuators 10dB, 20dB, 30dB and 40dB, the attenuators A, B, C and D can be selected from the fixed attenuators or the combination, and the formula can be obtained: { attenuator A, attenuator B, attenuator C, attenuator D }, and {10n1, 10n2, 10n3, 10n4}; wherein n1, n2, n3 and n4 are natural numbers;
the programming test step comprises the following steps: building a test platform according to the calculation result of the attenuation value of each position in the test connection block diagram, setting the distance of a response simulator as the maximum detection distance of the interrogator to be tested, and starting an MSK working mode; controlling an interrogator to send an MSK interrogation signal; reducing the resistance value of the variable attenuator by 0.1dB step from the upper limit of the adjusting range of the variable attenuator, and observing the decoding probability value of the interrogator; when the decoding probability value is stable to be 90%, recording the variable attenuator value Y1, and then controlling the interrogator to stop transmitting; loosening a joint between the radio-frequency cable A and the variable attenuator, connecting the peak power meter, controlling the interrogator to send an MSK (minimum shift keying) interrogation signal, recording a power value P4 of the peak power meter, and then controlling the interrogator to stop transmitting; powering off all equipment, loosening a joint between a radio-frequency cable B and a variable attenuator, loosening a joint between a radio-frequency cable C and an interrogator, and testing line loss between a loose end of the radio-frequency cable B and a loose end of the radio-frequency cable C at a frequency point of 1090MHz by using a network analyzer, wherein the line loss is marked as Y2; the MSK decoding sensitivity of the interrogator is P' 1= (P4-Y1-Y2), and the result is recorded; if P' 1 is within the preset range, the product is qualified.
2. The method for accurately testing the MSK decoding sensitivity of the interrogator as claimed in claim 1, wherein the interrogator interrogation signal path further comprises a code loader, and the code loader is respectively connected with the interrogator and the response simulator.
3. The method for accurately testing the decoding sensitivity of the MSK applied to the interrogator as set forth in claim 1, wherein the method for determining the attenuation value of each position in the test connection diagram is: substituting the peak power P1 of the sigma channel and the omega channel of the query machine to be tested and the decoding sensitivity P' 1 range of the sigma channel into a formula to determine attenuators or attenuator combinations to be connected with the attenuator A, the attenuator B, the attenuator C and the attenuator D in a test connection block diagram; determining the adjusting range of the variable attenuator after being limited by a formula; and verifying whether the sensitivity test range can cover the sigma-channel decoding sensitivity P' 1 range of the device to be tested under the test connection block diagram.
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