CN108572353A - A kind of burst length Sequence Planning method of low probability of intercept radar - Google Patents
A kind of burst length Sequence Planning method of low probability of intercept radar Download PDFInfo
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- CN108572353A CN108572353A CN201810398933.9A CN201810398933A CN108572353A CN 108572353 A CN108572353 A CN 108572353A CN 201810398933 A CN201810398933 A CN 201810398933A CN 108572353 A CN108572353 A CN 108572353A
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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
- 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
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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
- 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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The invention discloses a kind of burst length Sequence Planning method of low probability of intercept radar, main thought is：Determine radar, there are targets in the detection range of the radar；Then determine that radar emits N number of pulse signal in a coherent processing inteval；The pulse signal total number N emitted in a coherent processing inteval according to radar sets the time interval vector t of N number of pulse signal；N number of pulse signal that radar emits in a coherent processing inteval receives the echo of N number of pulse signal after target, then according to the time interval vector t of N number of pulse signal, obtains N number of pulse echo signal vector S and amplitude-frequency response matched filtering function successively；And then build minimax Doppler sidelobne object function；The minimax Doppler sidelobne object function is solved, obtained result is the optimization time interval vector of N number of pulse signalThe optimization time interval vector of N number of pulse signalFor a kind of burst length Sequence Planning result of low probability of intercept radar.
Description
Technical field
The invention belongs to Radar Technology field, more particularly to the burst length Sequence Planning method of a kind of low probability of intercept radar,
Suitable for the low intercepting and capturing of counterreconnaissance.
Background technology
Low probability of intercept radar (low probability of intercept radar) refers to a radar system
Radiation signal is less than the detection threshold of other side's elint receiver, while target still can be found in operating distance, letter and
Yan Zhi, LPI radar can detect target while not being trapped receiver and finding.
In previous radar antireconnaissance and counter-measure, in order to reduce scouting performance of the reconnaissance plane to radar, for single step
Radar, mainly in such a way that irregular repetition, frequency agility or low probability of intercept radar signal etc. change parameter, but these sides
Formula is all to exchange confrontation performance for using complicated processing procedure as cost；For multi-section radar, such as multiple-input and multiple-output
(MIMO) radar, in a manner of being the performance by the quantity of equipment to promote confrontation, both processing modes are respectively present complexity
The defect of processing procedure and high costs mode.
Pulse trains de-interleaving is the very important link that Acquisition Receiver obtains radar information, it is by using with arteries and veins
The single pulse parameter for rushing describing word (for describing pulse various parameters information) expression completes Pulse trains de-interleaving；When space simultaneously
There are when several pulses, these continuous pulses may be from multiple radiation sources, and Acquisition Receiver goes to hand over by pulse at this time
Pulse from the same radiation source is separated from train of pulse staggeredly, returns into a pulse group, pulse is gone by wrong technology
The available pulse parameter of interleaving technique has pulse recurrence frequency, radio frequency, pulse width, direction of arrival etc.；However in complex environment,
When arrival direction angle effectively in the case of Pre-sorting, cannot generally can not be diluted by carrier frequency completely, and pulse-width data due to
It measures and the caused modulation of scanning causes many times to shake very greatly, be not suitable for main sorting, at this point, being retouched based on pulse
The Pre-sorting of word is stated in addition to arrival direction angle, is largely dependent upon De-interleaving of Radar Signals, De-interleaving of Radar Signals technology is mainly according to thunder
Effective impulse is extracted up to parameter pulse recurrence interval or repetition rate, by being counted to all pulse arrival times
The time interval between any two pulse received is calculated, is made and is histogram with the curve of its frequency and then finds out pulse weight
The multiple period is also all to carry out processing realization based on histogram for other De-interleaving of Radar Signals technologies, in histogram
It will appear one or more peak value, to which the pulse repetition period of radar is screened out the pulse spacing of acquisition radar signal
Information.
In order to prevent enemy that from capable of filtering out using De-interleaving of Radar Signals technology the cycle information of our radar transmitted pulse；Tradition
The repetition variation of radar signal is all one or several the fixed flat rates of using, is held in this way due to the limitation of improvement factor
Peak value is easily formed on the histogram, is easy to be screened out.
Invention content
Existing substance frequency is easy to by the defect of reconnaissance plane De-interleaving of Radar Signals for the above-mentioned prior art, and the purpose of the present invention exists
In a kind of burst length Sequence Planning method of low probability of intercept radar of proposition, the burst length Sequence Planning side of this kind of low probability of intercept radar
Method can promote the safety of radar information for promoting the difficulty that reconnaissance plane sorts radar signal pulse time interval.
The main thought of the present invention：Pulse number is determined first and determines the value range of pulse interval to assume arteries and veins
Rush time interval, it is desirable that any two pulse is numerically unequal, builds the constraints of pulse interval, simultaneously
Processing using receiver to echo establishes the mini-max optimization function about Doppler frequency according to pulse accumulation formula,
Constraints and object function to foundation are solved to obtain pulse interval vector.
To reach above-mentioned technical purpose, the present invention is realised by adopting the following technical scheme.
A kind of burst length Sequence Planning method of low probability of intercept radar, includes the following steps：
Step 1, radar is determined, there are targets in the detection range of the radar；Then determine radar in a coherent
The N number of pulse signal of transmitting in reason interval；N is the positive integer more than 0；
Step 2, the pulse signal total number N emitted in a coherent processing inteval according to radar sets N number of pulse letter
Number time interval vector t；
Step 3, N number of pulse signal that radar emits in a coherent processing inteval receives N number of pulse after target
The echo of signal obtains N number of pulse echo signal vector S then according to the time interval vector t of N number of pulse signal；
Step 4, according to N number of pulse echo signal vector S, amplitude-frequency response matched filtering function is obtained；
Step 5, according to amplitude-frequency response matched filtering function, minimax Doppler sidelobne object function is built；
Step 6, the minimax Doppler sidelobne object function is solved, obtained result is N number of pulse signal
Optimize time interval vectorThe optimization time interval vector of N number of pulse signalFor a kind of low probability of intercept radar pulse when
Between Sequence Planning result.
Beneficial effects of the present invention：
The present invention is due to before radar pulse emits, being modulated pulse interval so that when any two pulse
Between be spaced and differ, and Doppler sidelobne is inhibited using pulse accumulation technology during Echo Processing, effectively
It inhibits the peak value in time interval △ T histograms to generate, improves reconnaissance plane and utilize De-interleaving of Radar Signals technology between the burst length
Every detection difficulty, and then can not be detected with radar information, the safety of radar be improved, in gentle histogram peak
Doppler sidelobne after suppressor pulse accumulation simultaneously, can not reduce to target as possible while improving indicator safety
Detection property.
Description of the drawings
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of burst length Sequence Planning method flow block diagram of low probability of intercept radar of the present invention；
Fig. 2 is the frequency width response diagram of data-optimized afterpulse accumulation as N=16；
Fig. 3 is the frequency width response diagram of data-optimized afterpulse accumulation as N=16；
Fig. 4 is the frequency width response diagram of data-optimized prepulse accumulation as N=501；
Fig. 5 is the frequency width response diagram of data-optimized afterpulse accumulation as N=501；
Fig. 6 be histogram size interval be 0.05ms when, pulse train single order histogram；
Fig. 7 be histogram size interval be 0.005ms when, pulse train single order histogram；
Fig. 8 be histogram size interval be 0.05ms when, pulse train second order histogram；
Fig. 9 be histogram size interval be 0.005ms when, pulse train second order histogram.
Specific implementation mode
Referring to Fig.1, it is a kind of burst length Sequence Planning method flow block diagram of low probability of intercept radar of the invention；Wherein institute
The burst length Sequence Planning method for stating low probability of intercept radar, includes the following steps：
Step 1, radar is determined, there are targets in the detection range of the radar；Then determine radar in a coherent
The N number of pulse signal of transmitting in the CPI of reason interval；N is the positive integer more than 0.
Specifically, it is determined that radar, there are target in the detection range of the radar, the target includes reconnaissance plane, described
Radar is used for detection radar signal for detecting target, the reconnaissance plane；Determine that radar is sent out in a coherent processing inteval CPI
N number of pulse signal is penetrated, then the time that n-th of pulse reaches reconnaissance plane is tn, expression formula is：
Wherein, i=1,2 ..., n-1, n=1,2 ..., N, t0Indicate that N number of pulse signal reaches the initial time of reconnaissance plane,
N indicates that the pulse signal total number that radar emits in a coherent processing inteval CPI, N are the positive integer more than 0.
Step 2, the pulse signal total number N emitted in a coherent processing inteval CPI according to radar, sets N number of arteries and veins
Rush the time interval vector t of signal.
The sub-step of step 2 is：
(2.1) according to the minimum detectable range d of radarminWith the maximum detectable range d of radarmax, determine single pulse signal
The value range T of time intervalminAnd Tmax, expression formula is respectively：
Wherein, C indicates the light velocity.
(2.2) the pulse signal total number N emitted in a coherent processing inteval CPI according to radar, sets N number of pulse
The time interval vector t of signal, expression formula are：
T=[T1,T2,…,Ti,…,TN-1]
Wherein, the time interval vector t of N number of pulse includes N-1 time interval, TiIndicate a Coherent processing
It is spaced the time interval of radar emission i-th of pulse signal and i+1 pulse signal in CPI, Ti∈[Tmin,Tmax], ∈ tables
Show and belong to,dminIndicate the minimum detectable range of radar, dmaxIndicate radar maximum probe away from
From C indicates the light velocity；I=1,2 ..., n-1, n=1,2 ..., N, N indicate what radar emitted in a coherent processing inteval CPI
Pulse signal total number；The data discontinuity analyzed according to reconnaissance plane statistics with histogram, it is desirable that when for arbitrary neighborhood two
Between be spaced and all meet：
s.t Ti,Tj∈[Tmin,Tmax]
i,j∈[1,n-1]
Ti≠Tj
Wherein, i ≠ j, i=1,2 ..., n-1, j=1,2 ..., n-1, n=1,2 ..., N.
Due to the difference of each time interval in the time interval vector t of N number of pulse signal, reconnaissance plane is caused to intercept and capture thunder
It cannot count to obtain the pulse repetition period information of radar after up to pulse, and then achieve the effect that low intercepting and capturing.
Step 3, N number of pulse signal that radar emits in a coherent processing inteval CPI receives N number of arteries and veins after target
The echo of signal is rushed, then according to the time interval vector t of N number of pulse signal, obtains N number of pulse echo signal vector S.
Specifically, N number of pulse signal that radar emits in a coherent processing inteval CPI receives N number of after target
The echo of pulse signal；Setting radar immobilizes to the speed of target in the detection process of target, and according to N number of pulse signal
Time interval vector t, obtain N number of pulse echo signal vector S, expression formula is：
Wherein,Indicate the mathematical form of single pulse signal, i=1,2 ..., n-1, TiIndicate that one is concerned with
The time interval of radar emission i-th of pulse signal and i+1 pulse signal, n=1,2 ..., N, N tables in the CPI of processing interval
Show the pulse signal total number that radar emits in a coherent processing inteval；fdIt indicates to be used to match mesh during correlative accumulation
Mark the Doppler frequency of speed, fdIt is unknown quantity；At the time of t indicates that radar receives the 1st pulse signal echo.
Step 4, according to N number of pulse echo signal vector S, amplitude-frequency response matched filtering function is obtained.
The sub-step of step 4 is：
4.1 utilize N number of pulse echo signal vector S, establish about correlative accumulation in the process for matching target velocity
Doppler frequency fdFunction alpha (fd), expression formula is：
Wherein, T1Indicate the 1st pulse signal of radar emission and the 2nd pulse signal in a coherent processing inteval CPI
Time interval, T2Indicate the 2nd pulse signal of radar emission and the 3rd pulse signal in a coherent processing inteval CPI
Time interval.
4.2 according to the Doppler frequency f about for matching target velocity during correlative accumulationdFunction alpha
(fd), and amplitude-frequency response matched filtering function H (f are calculated using correlative accumulation formulad,fd'), expression formula is：
H(fd,fd')=αH(fd′)α(fd)
Wherein, fd' indicate the corresponding Doppler frequency of target velocity, fd'=2vfc/ C, C indicate that the light velocity, v indicate target speed
Degree, fcIndicate that radar emits the carrier frequency of each pulse signal in a coherent processing inteval CPI, subscript H indicates that conjugation turns
Set operation.
Step 5, according to amplitude-frequency response matched filtering function, minimax Doppler sidelobne object function is built.
Specifically, to the amplitude-frequency response matched filtering function H (fd,fd') Modulus of access, obtain amplitude-frequency response matched filtering
Function modulus value | H (fd,fd′)|；According to the position of amplitude-frequency response matched filtering peak of function and fd' related, and the optimization of this method
With fd' unrelated, therefore enable fdObtained after '=0Hz | H (fd,0)|；Then structure minimax Doppler sidelobne object function f
(t), expression formula is：
Wherein, fminIndicate the minimum Doppler frequency value of matching target velocity,fmaxIndicate matching target
The maximum doppler frequency value of speed,fcIndicate that radar emits each in a coherent processing inteval CPI
The carrier frequency of pulse signal, C indicate the light velocity, vminIndicate target velocity minimum value, vmaxIndicate that target velocity maximum value, max indicate
Maximizing operates, and min indicates operation of minimizing.
Step 6, the minimax Doppler sidelobne object function is solved, obtained result is N number of pulse signal
Time interval superior vectorThe time interval superior vector of N number of pulse signalFor a kind of low probability of intercept radar pulse when
Between Sequence Planning result.
Specifically, the minimax Doppler sidelobne object function f (t) is solved by secondary sequence planing method, obtained
To result be N number of pulse signal optimization time interval vectorThe optimization time interval vector of N number of pulse signal
For a kind of burst length Sequence Planning result of low probability of intercept radar；Wherein, the optimization time interval vector of N number of pulse signalIts expression formula is：
Wherein, the optimization time interval vector of N number of pulse signalInclude N-1 optimization time interval,It indicates
The optimization time interval of i-th of pulse signal of radar emission and i+1 pulse signal in one coherent processing inteval CPI,
∈ expressions belong to,dminIndicate the minimum detectable range of radar,
dmaxIndicate that the maximum detectable range of radar, C indicate the light velocity；I=1,2 ..., n-1, n=1,2 ..., N, N indicate radar at one
The pulse signal total number emitted in coherent processing inteval CPI.
Below in conjunction with emulation experiment, the technique effect of the present invention is described further：
1. simulating scenes：Assuming that the value range of target velocity is v ∈ [- 600,600] m/s, carrier frequency fc=1GHz, then
fmin=-40kHz, fmax=40kHz, i.e. fd∈[-40,40]kHz；The detection range range of radar is 200~400km, then arteries and veins
Rush the minimum value and maximum of T of signal intervalmin=1.33ms, Tmax=2.67ms, the section size q=1 μ s of histogram,
Light velocity C=3 × 108m/s。
2. emulation content：
When pulse signal number is less, there is randomness for the statistics of pulse signal interval, take pulse
Signal number is less mainly for illustrating that this method can reduce secondary lobe, and pulse signal number N=16 and N=501 is taken to come below
It is emulated and result is illustrated.
Emulation 1：Using the above experiment scene, as pulse signal number N=16, to pulse echo signal optimization before with it is excellent
Pulse accumulation is carried out after change, pulse accumulation Doppler's amplitude versus frequency characte is compared, as a result as shown in Figure 2 and Figure 3.
Emulation 2：Using the above experiment scene, as pulse signal number N=501, to pulse echo signal optimization before with
Pulse accumulation is carried out after optimization, pulse accumulation Doppler's amplitude versus frequency characte is compared, as a result as shown in figs. 4 and 5.
Emulation 3：Using the above experiment scene, as pulse signal number N=501, it is in histogram size interval
When 0.05ms and 0.005ms, pulse train single order histogram, as a result as shown in Figures 6 and 7.
Emulation 4：Using the above experiment scene, as pulse signal number N=501, it is in histogram size interval
When 0.05ms and 0.005ms, pulse train second order histogram, as a result as shown in Fig. 8 and Fig. 9.
3. analysis of experimental results：
According to simulation result, Fig. 2 after optimizing is declined relative to the amplitude for Fig. 1 highest secondary lobes being not optimised, and is reached
Expected effect is arrived；Fig. 4 after optimization is declined relative to the amplitude for Fig. 3 highest secondary lobes being not optimised, and has reached drop
The effect of low sidelobe, Fig. 5 and Fig. 6 are the data statistics of the single order time difference at 0.005ms and 0.05ms respectively, it can be seen that straight
Square figure tends towards stability, and can not determine pulse interval, produce a desired effect, and Fig. 7 and Fig. 8 is the number of second-order time difference
According to statistics, relative to the single order time difference as a result, Fig. 7 and Fig. 8 slightly has the appearance of peak value, the mainly shadow due to twice of time difference
It rings, but also slightly improves in effect.
In conclusion obtaining radar performance information in the way of histogram for reconnaissance plane, the present invention proposes that one kind exists
Set of pulses time interval sequence is cooked up in the value range of radar detection so that in pulse signal interval in histogram
On can not embody；The present invention provides optimal way and is optimized to pulse train, reached from the Statistics of histogram
To gentle histogram and reach no graing lobe, the effect of low sidelobe.
In conclusion emulation experiment demonstrates the correctness of the present invention, validity and reliability.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range；In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of burst length Sequence Planning method of low probability of intercept radar, which is characterized in that include the following steps：
Step 1, radar is determined, there are targets in the detection range of the radar；Then determine radar between a Coherent processing
Every the interior N number of pulse signal of transmitting；N is the positive integer more than 0；
Step 2, the pulse signal total number N emitted in a coherent processing inteval according to radar, sets N number of pulse signal
Time interval vector t；
Step 3, N number of pulse signal that radar emits in a coherent processing inteval receives N number of pulse signal after target
Echo obtain N number of pulse echo signal vector S then according to the time interval vector t of N number of pulse signal；
Step 4, according to N number of pulse echo signal vector S, amplitude-frequency response matched filtering function is obtained；
Step 5, according to amplitude-frequency response matched filtering function, minimax Doppler sidelobne object function is built；
Step 6, the minimax Doppler sidelobne object function is solved, obtained result is the optimization of N number of pulse signal
Time interval vectorThe optimization time interval vector of N number of pulse signalFor a kind of burst length sequence of low probability of intercept radar
Program results.
2. a kind of burst length Sequence Planning method of low probability of intercept radar as described in claim 1, which is characterized in that in step
In 2, the time interval vector t of N number of pulse signal, expression formula is：
T=[T1,T2,…,Ti,…,TN-1]
The time interval vector t of N number of pulse includes N-1 time interval, and two time intervals of arbitrary neighborhood all meet：
s.t Ti,Tj∈[Tmin,Tmax]
i,j∈[1,n-1]
Ti≠Tj
Wherein, i ≠ j, i=1,2 ..., n-1, j=1,2 ..., n-1, n=1,2 ..., N, N indicate radar in a Coherent processing
The pulse signal total number emitted in interval；TiIndicate i-th of pulse signal of radar emission and i-th in a coherent processing inteval
The time interval of+1 pulse signal, Ti∈[Tmin,Tmax], ∈ expressions belong to,dminIndicate thunder
The minimum detectable range reached, dmaxIndicate that the maximum detectable range of radar, C indicate the light velocity.
3. a kind of burst length Sequence Planning method of low probability of intercept radar as claimed in claim 2, which is characterized in that in step
In 3, N number of pulse echo signal vector S, expression formula is：
Wherein,Indicate the mathematical form of single pulse signal, i=1,2 ..., n-1, TiIndicate a Coherent processing
The time interval of radar emission i-th of pulse signal and i+1 pulse signal in interval, n=1,2 ..., N, N indicate radar
The pulse signal total number emitted in a coherent processing inteval；fdIt indicates to be used to match target velocity during correlative accumulation
Doppler frequency, fdIt is unknown quantity；At the time of t indicates that radar receives the 1st pulse signal echo.
4. a kind of burst length Sequence Planning method of low probability of intercept radar as described in claim 1, which is characterized in that step 4
Sub-step be：
4.1 utilize N number of pulse echo signal vector S, establish about correlative accumulation in the process for matching the how general of target velocity
Strangle frequency fdFunction alpha (fd), expression formula is：
Wherein, T1Indicate the 1st pulse signal of radar emission and between the time of the 2nd pulse signal in a coherent processing inteval
Every T2Indicate the time interval of radar emission the 2nd pulse signal and the 3rd pulse signal in a coherent processing inteval, TiTable
Show the time interval of radar emission i-th of pulse signal and i+1 pulse signal in a coherent processing inteval, i=1,
2 ..., n-1, n=1,2 ..., N, N indicate the pulse signal total number that radar emits in a coherent processing inteval；fdIt indicates
Doppler frequency during correlative accumulation for matching target velocity, fdIt is unknown quantity；T indicates that radar receives the 1st pulse
At the time of signal echo；
4.2 according to the Doppler frequency f about for matching target velocity during correlative accumulationdFunction alpha (fd), meter
Calculation obtains amplitude-frequency response matched filtering function H (fd,f′d), expression formula is：
H(fd,f′d)=αH(f′d)α(fd)
Wherein, f 'dIndicate the corresponding Doppler frequency of target velocity, f 'd=2vfc/ C, C indicate that the light velocity, v indicate target velocity, fc
Indicate that radar emits the carrier frequency of each pulse signal in a coherent processing inteval, subscript H indicates conjugate transposition operation.
5. a kind of burst length Sequence Planning method of low probability of intercept radar as described in claim 1, which is characterized in that in step
In 5, the minimax Doppler sidelobne object function is f (t), and expression formula is：
Wherein, to the amplitude-frequency response matched filtering function H (fd,f′d) Modulus of access, obtain amplitude-frequency response matched filtering Function Modules
Value | H (fd,f′d) | after enable fd'=0Hz is obtained | H (fd,0)|；Max indicates that maximizing operation, min indicate the behaviour that minimizes
Make, fminIndicate the minimum Doppler frequency value of matching target velocity,fmaxIndicate the maximum of matching target velocity
Doppler frequency value,fcIndicate that radar emits the load of each pulse signal in a coherent processing inteval
Frequently, C indicates the light velocity, vminIndicate target velocity minimum value, vmaxIndicate target velocity maximum value.
6. a kind of burst length Sequence Planning method of low probability of intercept radar as described in claim 1, which is characterized in that in step
In 6, the optimization time interval vector of N number of pulse signalIt is that the minimax is solved by secondary sequence planing method
It is that Doppler sidelobne object function f (t) is obtained as a result, its expression formula is：
Wherein, the optimization time interval vector of N number of pulse signalInclude N-1 optimization time interval,Indicate one
The optimization time interval of i-th of pulse signal of radar emission and i+1 pulse signal in coherent processing inteval,
∈ expressions belong to,dminIndicate the minimum detectable range of radar, dmaxTable
Show that the maximum detectable range of radar, C indicate the light velocity；I=1,2 ..., n-1, n=1,2 ..., N, N indicate that radar is concerned at one
The pulse signal total number emitted in processing interval.
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| CN111751792A (en) * | 2020-06-15 | 2020-10-09 | 哈尔滨工程大学 | Passive radar signal sorting PDW preprocessing method |
| CN114578293A (en) * | 2022-02-28 | 2022-06-03 | 中国人民解放军国防科技大学 | Electric scanning radar signal identification method by using intercepted signal amplitude value |
| CN116821658A (en) * | 2023-06-29 | 2023-09-29 | 中国船舶集团有限公司第七二三研究所 | Clock period fingerprint feature extraction method suitable for different repetition interval types |
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