CN110412512A - A kind of radar signal intra-pulse modulation characteristic analysis method - Google Patents
A kind of radar signal intra-pulse modulation characteristic analysis method Download PDFInfo
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- CN110412512A CN110412512A CN201910729335.XA CN201910729335A CN110412512A CN 110412512 A CN110412512 A CN 110412512A CN 201910729335 A CN201910729335 A CN 201910729335A CN 110412512 A CN110412512 A CN 110412512A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/006—Theoretical aspects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to the technical fields of radar signal, and more particularly to a kind of radar signal intra-pulse modulation characteristic analysis method, conditioning is clear, and accuracy rate is high；The following steps are included: (1) sentences type: the intrapulse modulation characteristic type of judgement detecting radar signal；(2) determine content: based on the type determination correlation values to be calculated of intrapulse modulation characteristic；(3) count value: accurately calculating the correlation values of intrapulse modulation characteristic；(4) it pushes away performance: according to the signal intrapulse modulation characteristic type and calculated correlation values of judgement, being inferred to radar correlation technique and tactics index.
Description
Technical field
The present invention relates to the technical fields of radar signal, more particularly to a kind of radar signal intra-pulse modulation signature analysis side
Method.
Background technique
It is well known that the game between radar and radar electronic warfare is increasingly fierce in modern battlefield.As radar ew reconnaissance
Side, the useful information for obtaining radar emission signal are most important.Radar emission signal is after spatial, by radar ew reconnaissance
Equipment intercept and capture, sample, storing and carrying out relevant treatment, obtained in intrapulse modulation characteristic be radar emission signal in time-frequency domain
Major embodiment, and to the important evidence that radar signal and its related technique and tactics index are analyzed.For intra-pulse modulation spy
Levy simple radar signal, by time-frequency figure or when phasor directly can be analyzed and be judged, but radar big multi-emitting at present
Signal with complex modulation pattern, such as linear FM signal, NLFM signal, frequency coded signal, two-phase volume
The application such as code signal and four phase encoded signals is very extensive, and the intrapulse modulation characteristic pattern of these modulated signals is complicated, passes through
It calculates that the technique and tactics index of radar signal is even more extremely difficult, is the difficult point in radar ew reconnaissance intelligence analysis.From mesh
From the point of view of preceding disclosed documents and materials, lacks and the method that system is effectively analyzed is carried out to complicated intrapulse modulation characteristic, be more the absence of
How from intrapulse modulation characteristic to further infer that out that the important technique and tactics of radar object refers to calibration method.
Summary of the invention
In order to solve the above technical problems, a kind of present invention provides conditioning clear, the high radar signal intra-pulse modulation of accuracy rate
Characteristic analysis method.
A kind of radar signal intra-pulse modulation characteristic analysis method of the invention, comprising the following steps:
(1) sentence type: the intrapulse modulation characteristic type of judgement detecting radar signal；
(2) determine content: based on the type determination correlation values to be calculated of intrapulse modulation characteristic；
(3) count value: accurately calculating the correlation values of intrapulse modulation characteristic；
(4) it pushes away performance: according to the signal intrapulse modulation characteristic type and calculated correlation values of judgement, being inferred to radar phase
Close technique and tactics index.
A kind of radar signal intra-pulse modulation characteristic analysis method of the invention is adjusted in the arteries and veins being related in the step (1)
Characteristic type processed is linear FM signal, NLFM signal, frequency coded signal, Coded Signals and four phases coding
Signal.
A kind of radar signal intra-pulse modulation characteristic analysis method of the invention, the linear FM signal is in step (2)
Calculative numerical value has time width, bandwidth and modulation slope, the NLFM signal calculative number in step (2)
Value has time width, bandwidth and FM Function, and the frequency coded signal calculative numerical value in step (2) has time width, subcode
Width, bandwidth, carrier frequency number and frequency set, the Coded Signals and four phase encoded signals need to count in step (2)
The numerical value of calculation has time width, subcode width, code length and grouping of bits.
Compared with prior art the invention has the benefit that this method from detecting radar signal relationship between frequency and time figure or when
Facies relationship diagram is started with, and is accurately judged to intra-pulse modulation pattern first by the difference between different modulating pattern, and then determination is wanted
The related intrapulse modulation characteristic parameter of calculating finally infers the skill war of radar based on calculated related intrapulse modulation characteristic numerical value
Art index, actual data analysis demonstrate the validity of this method.
Detailed description of the invention
Attached drawing 1 is flow chart of the invention；
Attached drawing 2 is the relationship between frequency and time figure of linear FM signal；
Attached drawing 3 is the relationship between frequency and time figure of NLFM signal；
Attached drawing 4 is the relationship between frequency and time figure of frequency coded signal；
Facies relationship diagram when attached drawing 5 is Coded Signals；
Facies relationship diagram when attached drawing 6 is four phase encoded signal；
Attached drawing 7 is the relationship between frequency and time figure for surveying linear FM signal.
Specific embodiment
With reference to embodiment, the embodiment of the present invention is furthur described in detail.Following embodiment is used for
Illustrate the present invention, but is not intended to limit the scope of the invention.
Embodiment:
(1) first step analyzed the intrapulse modulation characteristic of radar signal exactly determines the modulation type of signal, referred to as sentences
Type.
Fig. 2-Fig. 6 is the common linear FM signal of current radar, NLFM signal, frequency coded signal, two-phase
The relationship between frequency and time figures of encoded signal and four phase encoded signals or when facies relationship diagram, relationship between frequency and time figure and Shi Xiangguan between them
It is that figure has a certain difference.
For example the time-frequency line in the relationship between frequency and time figure of linear FM signal is the straight line with certain slope, works as slope
When for positive value, corresponding is forward chirped signal, i.e., frequency is ascending is modulated；It is corresponding when slope is negative value
Be negative sense linear FM signal, i.e., frequency is descending is modulated.Compared with linear FM signal, NLFM signal
Time-frequency line be not straight line, pattern is determined by FM Function, and what Fig. 3 was provided is parabolic type FM signal, remove this
Except, there are also sinusoidal patterns, longitudinal cosine type, saw-tooth wave type etc..Fig. 4 is the relationship between frequency and time figure of frequency coded signal, with linear frequency modulation
Signal is compared with NLFM signal, and maximum difference is exactly that the time-frequency line of signal is discontinuous, is modulated according to encoding law
At 5 sections, 5 subpulses are respectively corresponded.For phase-coded signal, it is vertical seat with the maximum difference of frequency modulated signal
Mark, ordinate are phase, and respective value indicates the degree that subpulse jumps at the moment inside phase-coded signal, when phase is 0
It is Coded Signals when being jumped between degree and 180 degree, as shown in figure 5, phase is between 0 degree, 90 degree, 180 degree and 270 degree
Shi Weisi phase encoded signal is jumped, as shown in Figure 6.The rule of jump is encoding law, and the minimum period of jump is subcode width,
The number of subcode is then code length.
Different information as described above, can by the relationship between frequency and time figure of radar signal or when facies relationship diagram accurately sentence
Break its modulation type.
(2) second step analyzed the intrapulse modulation characteristic of signal is the type determination based on intrapulse modulation characteristic
The correlation values to be calculated referred to as determine content.Need to analyze time width, bandwidth, modulation slope for linear FM signal；It is non-linear
FM signal needs to analyze time width, bandwidth, FM Function；Frequency code signal needs to analyze time width, subcode width, bandwidth, carrier frequency
Number and frequency set；Phase-coded signal then needs to analyze time width, subcode width, code length and grouping of bits.
(3) third step that the intrapulse modulation characteristic of signal is analyzed, exactly to intrapulse modulation characteristic correlation values
It calculates, referred to as count value.For linear FM signal, it is necessary first to calculate its time width and bandwidth, time width, that is, pulse width,
It can be directly obtained by the numerical value in abscissa, as shown in Figure 1, its time width is 1000us, bandwidth is then the maximum value with frequency
Minimum value is subtracted, is 5MHz, modulation slope is then calculated by formula again, is i.e. bandwidth is 5000 MHz/s divided by time width；It is right
In NLFM signal in addition to calculating time width and bandwidth, its modulation function is also calculated, is parabolic function；For frequency
Encoded signal also needs to calculate time width and bandwidth, additionally needs to calculate its subcode width and carrier frequency number, wherein subcode
Width is exactly the width for the subpulse modulated, and is 100us, and carrier frequency number is 2；For phase-coded signal, need first to calculate it
Time width and subcode width, and then calculate subcode number, encoding law again etc., time width is 64us in figure, and subcode width is
8us, code length 8, encoding law are [10111110].
(4) it can be pushed away according to the signal modulation style of judgement and calculated correlation values in conjunction with other parameters
Disconnected radar correlation technique and tactics performance out, this is the 4th step and final step of signal intrapulse modulation characteristic analysis, referred to as pushing away property
Energy.
Such as linear FM signal can effectively calculate the arteries and veins after signal compression by time width, bandwidth and modulation slope
Width, as inverse (inverse of 5MHz) 0.2us of bandwidth are rushed, then calculating distance resolution using following formula is 30m
Analysis for frequency coded signal can not only determine that it, can be with big bandwidth and higher distance resolution
Infer it with good low probability of intercept characteristic；For phase-coded signal, since it is usually used in tracking, in guidance radar,
On the basis of analyzing its distance resolution and velocity resolution, operation use can be carried out in conjunction with other parameters such as carrier frequency, repetitions
The deduction on way.
In summary content sums up exactly the method and step of radar signal intra-pulse modulation signature analysis: sentence type,
Determine content, the value that counts, push away performance, referred to as " sentence, determine, calculating, pushing away ".
Fig. 7 is the relationship between frequency and time figure of certain radar signal detected.Intra-pulse modulation spy is carried out to it according to the method for the present invention
The analysis of sign can quickly determine that it is linear FM signal first；Then the content to be analyzed it is determined, for linearly adjusting
The content of frequency signal Main Analysis has time width, bandwidth and modulation slope；Being calculated one by one it is respectively 8us, 4MHz and 32；Most
After be obtained by calculation its compression after pulsewidth be 0.25us, determine its distance resolution be 37.5m, illustrate the radar to detection mesh
The requirement with higher of target distance resolution may infer that the radar for guiding or fire control in conjunction with its carrier frequency value
Possibility is larger, and threat level is higher.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications, these improvements and modifications can also be made
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of radar signal intra-pulse modulation characteristic analysis method, which comprises the following steps:
(1) sentence type: the intrapulse modulation characteristic type of judgement detecting radar signal；
(2) determine content: based on the type determination correlation values to be calculated of intrapulse modulation characteristic；
(3) count value: accurately calculating the correlation values of intrapulse modulation characteristic；
(4) it pushes away performance: according to the signal intrapulse modulation characteristic type and calculated correlation values of judgement, being inferred to radar phase
Close technique and tactics index.
2. a kind of radar signal intra-pulse modulation characteristic analysis method as described in claim 1, which is characterized in that the step
(1) the intrapulse modulation characteristic type being related in is linear FM signal, NLFM signal, frequency coded signal, two-phase
Encoded signal and four phase encoded signals.
3. a kind of radar signal intra-pulse modulation characteristic analysis method as claimed in claim 2, which is characterized in that the linear tune
Frequency signal calculative numerical value in step (2) has time width, bandwidth and modulation slope, and the NLFM signal is in step
(2) calculative numerical value has time width, bandwidth and FM Function in, and the frequency coded signal needs to calculate in step (2)
Numerical value have time width, subcode width, bandwidth, carrier frequency number and frequency set, the Coded Signals and four phase encoded signals
Calculative numerical value has time width, subcode width, code length and grouping of bits in step (2).
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Application publication date: 20191105 |