CN114019462A - Method for improving low interception performance and anti-interference performance of radar - Google Patents

Method for improving low interception performance and anti-interference performance of radar Download PDF

Info

Publication number
CN114019462A
CN114019462A CN202210007712.0A CN202210007712A CN114019462A CN 114019462 A CN114019462 A CN 114019462A CN 202210007712 A CN202210007712 A CN 202210007712A CN 114019462 A CN114019462 A CN 114019462A
Authority
CN
China
Prior art keywords
echo
frequency
signal
processing
radar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210007712.0A
Other languages
Chinese (zh)
Other versions
CN114019462B (en
Inventor
朱振波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Force Early Warning Academy
Original Assignee
Air Force Early Warning Academy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Force Early Warning Academy filed Critical Air Force Early Warning Academy
Priority to CN202210007712.0A priority Critical patent/CN114019462B/en
Publication of CN114019462A publication Critical patent/CN114019462A/en
Application granted granted Critical
Publication of CN114019462B publication Critical patent/CN114019462B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G01S7/41—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention relates to a method for improving low interception performance and anti-interference performance of a radar, which comprises the steps of constructing a frequency agile transmission signal, carrying out pulse compression processing on a received signal in a butt joint mode, carrying out frequency agile signal phase cancellation processing and frequency agile signal detection fusion processing, wherein the method utilizes pairwise conjugate multiplication of adjacent target echoes after pulse pressure to change a phase interference item coupled with the number of transmission pulses, transmission pulse time, target distance and speed in the echo signal into a constant phase item, so that coherent processing and target detection can be realized, and the adaptability of an algorithm is improved; meanwhile, the method can realize coherent processing of echo matrixes of two frequency agility models, can realize fusion detection on detection results of the echo matrixes, and improves the anti-interference performance and adaptability of a signal processing algorithm. The method is suitable for low, medium and high repetition frequency modes and has good expansibility.

Description

Method for improving low interception performance and anti-interference performance of radar
Technical Field
The invention relates to the technical field of radar anti-interference, in particular to a method for improving low interception performance and anti-interference performance of a radar.
Background
Along with the development of the radar technology, the radar interference technology also realizes qualitative leap, gradually develops from the traditional rough interference mode to the distributed interference mode, the smart interference mode, the composite interference mode and the self-adaptive interference mode, and brings great harm to the radar.
In view of the real threat brought to the radar by the development of the interference technology, since the birth of the radar, research on the radar anti-interference technology has not been stopped, and specifically, a space domain anti-interference measure, a frequency anti-interference measure, a signal processing domain anti-interference measure and the like exist. In recent years, under the actual promotion that interference and a target environment are increasingly complex, radar anti-interference technology is greatly improved, and typical technologies comprise a novel ultra-low sidelobe antenna technology, a digital beam forming technology, a blind source separation technology, a signal random agility technology and the like. The frequency agility is an active anti-interference measure, and through actively converting the transmitting frequency, the interference perception and the interference decision difficulty are increased, so that the chance of interference entering a radar is reduced, or the interference energy entering the radar is reduced, and the purpose of active anti-interference through the frequency agility is achieved. The frequency agility is divided into pulses or groups of pulses randomly agile radar. The pulse group agility radar still has the pulse group working characteristics, is still easy to be detected and interfered, and has limited anti-interference effect improvement. The inter-pulse random frequency radar improves the low interception performance and anti-interference performance of the radar due to random frequency agility, but the relative motion and agile frequency between the target and the radar can cause the radar echo signal to have the problem of frequency and target distance and speed coupling, so that the traditional coherent processing algorithm is not applicable any more, and the application of the inter-pulse random frequency agility technology in the radar is challenged. For the problem, the existing documents mostly adopt a high repetition frequency stepping technology, and utilize the same frequency pulse sequence to perform coherent processing and frequency stepping signals to obtain distance high resolution signals, or perform compensation of target speed and frequency coupling terms by a speed estimation method, and these methods mostly ignore the influence of the distance and frequency coupling terms on coherent processing performance, or perform coupling of speed, distance and the like according to distance units only under the condition of realizing distance high resolution. The method needs to work in a high repetition frequency mode, and needs to acquire a high-resolution range profile of a target at first to realize the coupling compensation of speed, range and frequency, and has the serious problems of range ambiguity and range occlusion, so that the method has large limitation, and the practical application of the related technology in the radar is restricted by the factors.
Disclosure of Invention
The present invention aims to overcome the defects of the prior art and provide a method for improving the low interception performance and the interference resistance of a radar.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for improving low interception performance and anti-interference performance of a radar, which comprises the following steps:
s1, constructing a frequency agile transmitting signal;
the frequency agile signal adopts the LFM signal form in the pulse, and the center frequency of the LFM signal with different transmission periods is according to
Figure 50009DEST_PATH_IMAGE001
The method is changed in an agile way, wherein,
Figure 985604DEST_PATH_IMAGE002
；
Figure 739671DEST_PATH_IMAGE003
；
Figure 661491DEST_PATH_IMAGE004
is a rounding operation to zero;
Figure 584448DEST_PATH_IMAGE005
is a center frequency of frequency agility;
the stepping frequency agile signal works at equal pulse repetition intervals, under the condition of neglecting the influence of amplitude
Figure 566310DEST_PATH_IMAGE006
The expression of each transmitting signal is as follows:
Figure 433772DEST_PATH_IMAGE007
wherein,
Figure 660747DEST_PATH_IMAGE008
is the intra-pulse frequency modulation slope;
Figure 172631DEST_PATH_IMAGE009
is a frequency step interval;
Figure 325395DEST_PATH_IMAGE010
pulse width for transmitting signal;
Figure 414574DEST_PATH_IMAGE011
；
Figure 209354DEST_PATH_IMAGE012
is the total time;
Figure 74280DEST_PATH_IMAGE013
is a slow time;
Figure 663524DEST_PATH_IMAGE014
the time is fast;
Figure 115365DEST_PATH_IMAGE015
a pulse repetition period for the transmitted signal;
s2, carrying out pulse compression processing on the received echo signal
S201, constructing a radar echo signal:
for the first
Figure 448258DEST_PATH_IMAGE016
A frequency-agile transmitting pulse and distance
Figure 793788DEST_PATH_IMAGE017
The expression of the echo of the moving target is as follows:
Figure 55399DEST_PATH_IMAGE018
wherein,
Figure 260115DEST_PATH_IMAGE019
the target distance at the moment of time is
Figure 131119DEST_PATH_IMAGE020
；
Figure 206523DEST_PATH_IMAGE021
Is the target initial distance;
Figure 262203DEST_PATH_IMAGE022
is the target speed;
Figure 187172DEST_PATH_IMAGE023
is the speed of light;
Figure 861867DEST_PATH_IMAGE024
the coherent processing time;
s202, after the received radar echo data is subjected to pulse compression processing, the obtained pulse pressure echo signal is as follows:
Figure 57356DEST_PATH_IMAGE025
wherein,
Figure 159304DEST_PATH_IMAGE026
；
Figure 932088DEST_PATH_IMAGE027
is the speed of light;
Figure 646359DEST_PATH_IMAGE028
is the transmission signal bandwidth;
Figure 961934DEST_PATH_IMAGE029
receiving the serial number of the echo signal;
s203, setting
Figure 969205DEST_PATH_IMAGE030
For pulse pressure echo signals
Figure 635809DEST_PATH_IMAGE031
The phase term of (2) then has:
Figure 511361DEST_PATH_IMAGE032
agile the center frequency in S1
Figure 179978DEST_PATH_IMAGE033
Carry-in phase
Figure 623729DEST_PATH_IMAGE034
And unfolding the phase term to obtain:
Figure 512050DEST_PATH_IMAGE035
wherein, frequency is converted
Figure 66659DEST_PATH_IMAGE036
Distance to
Figure 215881DEST_PATH_IMAGE037
Coupled phase term of
Figure 609296DEST_PATH_IMAGE038
The frequency-agile and speed-dependent coupled phase term is
Figure 719334DEST_PATH_IMAGE039
The coupling term is related to the number of emitted pulses or time and is not a constant term;
the above-mentioned
Figure 812055DEST_PATH_IMAGE040
And said
Figure 956729DEST_PATH_IMAGE041
Therefore, the radar signal phase does not have the linear phase characteristic, and the radar signal phase can be compatible with the radar coherent processing technology only by carrying out cancellation or suppression processing on the radar signal phase.
Further, still include:
s3, frequency agile signal phase cancellation processing:
s301, constructing a frequency agile echo matrix;
because the frequency agility mode is odd-even sequence coherent step agility, in order to realize coherent processing, two echo matrixes are constructed for the frequency agility echo signals after pulse compression processing, and the two echo matrixes are respectively odd sequence echo matrixes formed by odd sequence step frequency signals
Figure 601337DEST_PATH_IMAGE042
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 697207DEST_PATH_IMAGE043
；
Wherein,
Figure 859198DEST_PATH_IMAGE044
counting the number of points after pulse pressure processing for each echo signal;
Figure 592798DEST_PATH_IMAGE045
the number of pulses of the odd-numbered sequence echo matrix,
Figure 814832DEST_PATH_IMAGE046
the number of pulses of the even sequence echo matrix.
Further, the S3 further includes:
s302, for the odd-numbered sequence echo matrix after pulse pressure processing
Figure 666507DEST_PATH_IMAGE047
The data after pulse pressure processing will be
Figure 225664DEST_PATH_IMAGE048
And
Figure 79351DEST_PATH_IMAGE049
and (3) carrying out conjugate multiplication on the echo signals of two adjacent odd-numbered sequences to obtain a new echo signal:
Figure 206707DEST_PATH_IMAGE050
；
Figure 309792DEST_PATH_IMAGE051
wherein,
Figure 46542DEST_PATH_IMAGE052
，
Figure 754735DEST_PATH_IMAGE053
odd serial numbers for receiving echo signals;
Figure 177626DEST_PATH_IMAGE054
；
Figure 236849DEST_PATH_IMAGE055
；
then
Figure 13175DEST_PATH_IMAGE056
The phase of (d) can be expressed as:
Figure 608498DEST_PATH_IMAGE057
Figure 608815DEST_PATH_IMAGE058
can be further simplified into
Figure 889754DEST_PATH_IMAGE059
According to the formula, the compound has the advantages of,
Figure 735351DEST_PATH_IMAGE060
and
Figure 542770DEST_PATH_IMAGE061
is a constant term independent of time, and has no influence on
Figure 946944DEST_PATH_IMAGE062
Performing coherent processing;
Figure 715180DEST_PATH_IMAGE063
is time of day
Figure 98888DEST_PATH_IMAGE064
A linear term of (d);
s303, for the even number sequence after the pulse pressure processingWave matrix
Figure 340907DEST_PATH_IMAGE065
The data after pulse pressure processing will be
Figure 151868DEST_PATH_IMAGE066
And
Figure 532034DEST_PATH_IMAGE067
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 719432DEST_PATH_IMAGE068
，
Figure 376810DEST_PATH_IMAGE069
；
Wherein,
Figure 857207DEST_PATH_IMAGE070
，
Figure 600035DEST_PATH_IMAGE071
even serial numbers for receiving echo signals;
Figure 450180DEST_PATH_IMAGE072
；
Figure 962064DEST_PATH_IMAGE073
；
then
Figure 114828DEST_PATH_IMAGE074
The phase of (a) is expressed as:
Figure 834698DEST_PATH_IMAGE075
Figure 629478DEST_PATH_IMAGE076
further can be simplified into:
Figure 995869DEST_PATH_IMAGE077
according to the formula, the compound has the advantages of,
Figure 444168DEST_PATH_IMAGE078
and
Figure 161588DEST_PATH_IMAGE079
is a constant term independent of time, and has no influence on
Figure 727436DEST_PATH_IMAGE080
Performing coherent processing;
Figure 948333DEST_PATH_IMAGE081
is time of day
Figure 974058DEST_PATH_IMAGE082
The linear term of (c).
Further, still include:
s4 frequency agile signal detection fusion processing
In signal processing, a new odd-numbered sequence echo matrix is obtained through phase cancellation processing
Figure 37829DEST_PATH_IMAGE083
And a new even sequence echo matrix
Figure 643254DEST_PATH_IMAGE084
Performing coherent detection processing such as clutter suppression and CFAR detection respectively to obtain a target detection result;
when the radar is not subject to interference, the new odd sequence echo matrix
Figure 485701DEST_PATH_IMAGE085
And said new even sequence echo matrix
Figure 416748DEST_PATH_IMAGE086
The detection result is subjected to non-phase of 1/2 criterionAccumulating ginseng;
when the radar is interfered, selecting the new odd sequence echo matrix which is not interfered
Figure 702236DEST_PATH_IMAGE087
Or the new even sequence echo matrix
Figure 376931DEST_PATH_IMAGE088
And outputting a detection result.
The invention has the beneficial effects that: according to the method, two-by-two conjugate multiplication of adjacent target echoes after pulse pressure is utilized, so that phase interference terms coupled with the number of transmitted pulses, the time of transmitted pulses, the target distance and the speed in echo signals are changed into constant phase terms, further coherent processing and target detection can be realized, and the adaptability of an algorithm is improved; meanwhile, the method can realize coherent processing of echo matrixes of two frequency agility models, can realize fusion detection on detection results of the echo matrixes, and improves the anti-interference performance and adaptability of a signal processing algorithm. The method is suitable for low, medium and high repetition frequency modes and has good expansibility.
The method can be suitable for the coherent processing of the radar signals in the conventional step frequency mode, and can also be popularized to the coherent processing when more step frequency coherent differences are agile.
The problems of high difficulty in compensating the coupling error of the frequency stepping radar, distance blurring and serious distance shielding in a high repetition frequency mode are solved, and the method has good expansibility.
Drawings
FIG. 1 is a flow chart of a method for improving low interception and interference immunity of a radar;
FIG. 2 is a flow chart of the frequency agile signal fusion process of the present invention;
FIG. 3 is a schematic diagram of step-by-step frequency agility;
FIG. 4 is a simulation result of echo signal pulse pressure and MTD processing without phase cancellation processing according to an embodiment;
fig. 5 is a simulation result of echo signal pulse pressure and MTD processing after cancellation processing according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a method for improving low interception and interference immunity of a radar includes the following steps:
s1, constructing a frequency agile transmitting signal;
the frequency agile signal adopts the LFM signal form in the pulse, and the center frequency of the LFM signal with different transmission periods is according to
Figure 837999DEST_PATH_IMAGE089
The method is changed in an agile way, wherein,
Figure 172903DEST_PATH_IMAGE090
；
Figure 86633DEST_PATH_IMAGE091
；
Figure 424073DEST_PATH_IMAGE092
is a rounding operation to zero;
Figure 474069DEST_PATH_IMAGE093
is a center frequency of frequency agility;
the stepping frequency agile signal works at equal pulse repetition intervals, under the condition of neglecting the influence of amplitude
Figure 12498DEST_PATH_IMAGE094
The expression of each transmitting signal is as follows:
Figure 914988DEST_PATH_IMAGE095
wherein,
Figure 931485DEST_PATH_IMAGE096
is the intra-pulse frequency modulation slope;
Figure 101567DEST_PATH_IMAGE097
is a frequency step interval;
Figure 404372DEST_PATH_IMAGE098
pulse width for transmitting signal;
Figure 292694DEST_PATH_IMAGE099
；
Figure 345838DEST_PATH_IMAGE100
is the total time;
Figure 901584DEST_PATH_IMAGE101
is a slow time;
Figure 250657DEST_PATH_IMAGE102
the time is fast;
Figure 360696DEST_PATH_IMAGE103
a pulse repetition period for the transmitted signal;
LFM signals are adopted in the constructed frequency agile radar signal pulse, the pulse width is the same, the bandwidth is the same, and the center frequency between pulses changes rapidly and pseudo randomly. The agility among the pulses of the radar transmitting signal frequency can increase the difficulty of reconnaissance, interception, sorting and identification, and improve the complexity of interference decision, so that the interference is difficult to accurately aim at the radar frequency in real time to implement narrow-band interference, or the interference power density is forced to be reduced to implement interference in a wide frequency band, and even effective interference cannot be released in real time.
Therefore, inter-pulse frequency agility is an important technical and tactical means for improving the anti-interference performance of the radar, but the radar transmits inter-pulse frequency agility waveforms, so that the existing coherent processing technology cannot be compatible, the target detection performance is reduced, and the clutter suppression function fails. Therefore, the radar frequency agility waveform must be matched or adapted to the agility coherent processing method, so that the purpose of compatibility of radar signal frequency agility and coherent processing is achieved, and the radar detection performance and the adaptability to the environment are improved.
The frequency agile signal constructed in the step is transmitted in odd numberThe signal center frequencies of the pulse sequence and the even number transmission pulse sequence are respectively stepped
Figure 843630DEST_PATH_IMAGE104
、
Figure 224189DEST_PATH_IMAGE105
Agility, the technical scheme is constructed based on a radar anti-interference method of frequency stepping coherent processing in a matching mode.
Referring to FIG. 3, the frequency agile mode, odd sequence transmit pulses (e.g., in a burst moden=1, 3, 5..) inter-pulse frequency by frequency interval
Figure 9742DEST_PATH_IMAGE106
Step-by-step agile, even-order sequence transmit pulses (e.g. forn=2, 4, 6..) inter-pulse frequency by frequency interval
Figure 872656DEST_PATH_IMAGE107
The stepping agility is carried out in a staggered mode, so that the random characteristic of frequency agility is increased, and the low interception of radar signals is improved.
S2, carrying out pulse compression processing on the received echo signal
S201, constructing a radar echo signal:
for the first
Figure 34647DEST_PATH_IMAGE108
A frequency-agile transmitting pulse and distance
Figure 532362DEST_PATH_IMAGE109
The expression of the echo of the moving target is as follows:
Figure 613451DEST_PATH_IMAGE110
wherein,
Figure 698081DEST_PATH_IMAGE111
the target distance at the moment of time is
Figure 398184DEST_PATH_IMAGE112
；
Figure 251871DEST_PATH_IMAGE113
Is the target initial distance;
Figure 157989DEST_PATH_IMAGE114
is the target speed;
Figure 729916DEST_PATH_IMAGE115
is the speed of light;
Figure 827185DEST_PATH_IMAGE116
the coherent processing time.
S202, after performing pulse compression processing (pulse pressure processing) on the received radar echo data, obtaining a pulse pressure echo signal as follows:
Figure 800957DEST_PATH_IMAGE117
wherein,
Figure 99215DEST_PATH_IMAGE026
；
Figure 391393DEST_PATH_IMAGE118
is the speed of light;
Figure 557933DEST_PATH_IMAGE119
is the transmission signal bandwidth;
Figure 589474DEST_PATH_IMAGE120
receiving the serial number of the echo signal;
s203, setting
Figure 324211DEST_PATH_IMAGE121
For pulse pressure echo signals
Figure 372195DEST_PATH_IMAGE122
The phase term of (2) then has:
Figure 952212DEST_PATH_IMAGE123
agile the center frequency in S1
Figure 634998DEST_PATH_IMAGE124
Carry-in phase
Figure 540637DEST_PATH_IMAGE125
And unfolding the phase term to obtain:
Figure 807408DEST_PATH_IMAGE126
wherein, frequency is converted
Figure 456695DEST_PATH_IMAGE127
Distance to
Figure 384200DEST_PATH_IMAGE128
Coupled phase term of
Figure 195161DEST_PATH_IMAGE129
The frequency-agile and speed-dependent coupled phase term is
Figure 450693DEST_PATH_IMAGE130
The coupling term is related to the number of emitted pulses or time and is not a constant term;
the above-mentioned
Figure 139556DEST_PATH_IMAGE131
And said
Figure 62513DEST_PATH_IMAGE132
Therefore, the radar signal phase does not have the linear phase characteristic, and the radar signal phase can be compatible with the radar coherent processing technology only by carrying out cancellation or suppression processing on the radar signal phase.
The method utilizes an echo matrix formed by odd and even sequences after pulse pressure to realize phase cancellation processing by multiplying adjacent target echoes pairwise, eliminates coupling phase interference items of frequency, distance and speed, and utilizes the echo matrix after the phase cancellation preprocessing to carry out coherent processing and target detection, thereby solving the influence of the coupling of the frequency of frequency agility and the distance and speed of the target on the coherent processing of the radar and improving the adaptability of the algorithm.
Also comprises the following steps of (1) preparing,
s3, frequency agile signal phase cancellation processing:
s301, constructing a frequency agile echo matrix;
because the frequency agility mode is odd-even sequence coherent step agility, in order to realize coherent processing, two echo matrixes are constructed for the frequency agility echo signals after pulse compression processing, and the two echo matrixes are respectively odd sequence echo matrixes formed by odd sequence step frequency signals
Figure 787204DEST_PATH_IMAGE134
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 637348DEST_PATH_IMAGE135
；
Wherein,
Figure 800531DEST_PATH_IMAGE136
counting the number of points after pulse pressure processing for each echo signal;
Figure 30655DEST_PATH_IMAGE137
the number of pulses of the odd-numbered sequence echo matrix,
Figure 418911DEST_PATH_IMAGE138
the number of pulses of an even number sequence echo matrix;
through the frequency agility model, the odd-even sequence of the frequency agility model is changed in a stepping and agile mode according to the difference of the respective frequency intervals. Thereby constructing an odd-sequence echo matrix formed by odd-sequence step frequency signals
Figure 50881DEST_PATH_IMAGE139
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 876011DEST_PATH_IMAGE140
Two echo matrices.
Through the processing, all the pulse-pressure echo signals are divided into two parts, namely an echo matrix
Figure 327852DEST_PATH_IMAGE141
And
Figure 519799DEST_PATH_IMAGE142
wherein
Figure 6275DEST_PATH_IMAGE143
For transmitting signals at intervals of frequency
Figure 766420DEST_PATH_IMAGE144
A step-frequency echo matrix that is step-agile,
Figure 204093DEST_PATH_IMAGE145
for transmitting signals at intervals of frequency
Figure 75097DEST_PATH_IMAGE146
The step frequency echo matrix with step agility can respectively inhibit frequency, distance and speed coupling interference items existing in the phase of an echo signal by adopting phase cancellation processing for the echo signal with step frequency characteristics, so that the echo signal with step frequency characteristics has coherent processing capability.
The inter-pulse frequency agility mode of the staggered stepping agility radar is designed, a foundation is laid for subsequent frequency, distance and speed coupling solution, and meanwhile the low interception performance of radar signals is greatly improved.
The S3 further includes:
s302, for the odd-numbered sequence echo matrix after pulse pressure processing
Figure 540713DEST_PATH_IMAGE147
After pulse pressure treatmentData, will be
Figure 206181DEST_PATH_IMAGE148
And
Figure 632614DEST_PATH_IMAGE149
and (3) carrying out conjugate multiplication on the echo signals of two adjacent odd-numbered sequences to obtain a new echo signal:
Figure 797055DEST_PATH_IMAGE150
；
Figure 258123DEST_PATH_IMAGE151
wherein,
Figure 219126DEST_PATH_IMAGE152
，
Figure 398435DEST_PATH_IMAGE153
odd serial numbers for receiving echo signals;
Figure 876821DEST_PATH_IMAGE154
；
Figure 425351DEST_PATH_IMAGE155
；
then
Figure 698201DEST_PATH_IMAGE156
The phase of (d) can be expressed as:
Figure 833647DEST_PATH_IMAGE157
Figure 974778DEST_PATH_IMAGE158
Figure 879281DEST_PATH_IMAGE159
can be further simplified into
Figure 824496DEST_PATH_IMAGE160
According to the formula, the compound has the advantages of,
Figure 447239DEST_PATH_IMAGE161
and
Figure 126482DEST_PATH_IMAGE162
is a constant term independent of time, and has no influence on
Figure 557594DEST_PATH_IMAGE163
Performing coherent processing;
Figure 296880DEST_PATH_IMAGE164
is time of day
Figure 639874DEST_PATH_IMAGE165
The linear term of (c).
Visible, pulse-pressure processed odd-number sequence echo matrix
Figure 263754DEST_PATH_IMAGE166
Then will be first
Figure 142848DEST_PATH_IMAGE167
And
Figure 53035DEST_PATH_IMAGE168
conjugate multiplication of two adjacent odd-numbered sequence echo signals, i.e.
Figure 650370DEST_PATH_IMAGE169
To obtain a new odd-sequence echo matrix
Figure 313826DEST_PATH_IMAGE170
Only constant terms and time-dependent linear terms are reserved in the phase terms, the frequency, distance and speed coupling interference terms are eliminated, the tight coupling processing among speed, distance and frequency is realized, and the following process is compatibleAnd performing isoparametric treatment on MTI, MTD or PD.
S303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 313006DEST_PATH_IMAGE171
The data after pulse pressure processing will be
Figure 269460DEST_PATH_IMAGE172
And
Figure 885249DEST_PATH_IMAGE173
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 83887DEST_PATH_IMAGE174
，
Figure 937574DEST_PATH_IMAGE175
；
Wherein,
Figure 330509DEST_PATH_IMAGE176
，
Figure 761490DEST_PATH_IMAGE177
even serial numbers for receiving echo signals;
Figure 999705DEST_PATH_IMAGE178
；
Figure 474942DEST_PATH_IMAGE179
；
then
Figure 38778DEST_PATH_IMAGE180
The phase of (a) is expressed as:
Figure 98001DEST_PATH_IMAGE181
Figure 405486DEST_PATH_IMAGE182
further can be simplified into:
Figure 732300DEST_PATH_IMAGE183
according to the formula, the compound has the advantages of,
Figure 467038DEST_PATH_IMAGE184
and
Figure 13557DEST_PATH_IMAGE185
is a constant term independent of time, and has no influence on
Figure 124732DEST_PATH_IMAGE186
Performing coherent processing;
Figure 666572DEST_PATH_IMAGE187
is time of day
Figure 85395DEST_PATH_IMAGE188
The linear term of (c).
Visible even number sequence echo matrix after pulse pressure processing
Figure 853630DEST_PATH_IMAGE189
Then will be first
Figure 237338DEST_PATH_IMAGE190
And
Figure 40209DEST_PATH_IMAGE191
conjugate multiplication of two adjacent odd-numbered sequence echo signals, i.e.
Figure 349706DEST_PATH_IMAGE192
To obtain a new even sequence echo matrix
Figure 729871DEST_PATH_IMAGE193
In which phase terms, again only constant terms and time-dependent linear terms are retained, the aforementioned frequenciesDistance and speed coupling interference items are eliminated, tight coupling processing among speed, distance and frequency is achieved, and follow-up MTI, MTD or PD and other coherent processing can be compatible.
Echo matrixes of different step frequency modes and echo matrixes after phase cancellation are constructed, and the anti-interference performance and adaptability of a signal processing algorithm are improved through fusion detection of different echo matrixes.
S4, detecting and fusing the agile frequency signals, please refer to fig. 2;
in signal processing, a new odd-numbered sequence echo matrix is obtained through phase cancellation processing
Figure 917270DEST_PATH_IMAGE194
And a new even sequence echo matrix
Figure 574648DEST_PATH_IMAGE195
Performing coherent detection processing such as clutter suppression, MTD (maximum likelihood detection), CFAR (computational fluid dynamics) detection and the like respectively to obtain a target detection result;
that is, in signal processing, a new odd-numbered sequence echo matrix obtained by phase cancellation processing is applied
Figure 556510DEST_PATH_IMAGE196
And a new even sequence echo matrix
Figure 158393DEST_PATH_IMAGE197
Respectively carrying out coherent detection processing; after processing such as clutter suppression and constant false alarm detection is finished, a detection result 0 or 1 is obtained respectively (0 represents no target, and 1 represents a target).
When the radar is not subject to interference, the new odd sequence echo matrix
Figure 650947DEST_PATH_IMAGE198
And a new even sequence echo matrix
Figure 428410DEST_PATH_IMAGE199
Carrying out 1/2 non-coherent accumulation on the detection result;
namely, it is
Figure 581174DEST_PATH_IMAGE200
Or
Figure 811298DEST_PATH_IMAGE201
If one of the targets is detected, judging that the target exists; the false alarm rate is reduced and the detection probability is improved;
when the radar is interfered, the odd sequence echo matrix which is not interfered is selected
Figure 839035DEST_PATH_IMAGE202
Or the even-numbered sequence echo matrix
Figure 736584DEST_PATH_IMAGE203
And outputting a detection result. So as to improve the anti-interference performance and effect.
The first embodiment is as follows:
setting the parameters of the frequency agile signal as follows:
Figure 325828DEST_PATH_IMAGE204
，
Figure 777669DEST_PATH_IMAGE205
transmitting a linear frequency-modulated signal with a number of coherent pulses of
Figure 969616DEST_PATH_IMAGE206
The repetition frequency is 200Hz (i.e.
Figure 957557DEST_PATH_IMAGE207
) Pulse width of signal
Figure 452124DEST_PATH_IMAGE208
=
Figure 656840DEST_PATH_IMAGE209
Bandwidth, bandwidth
Figure 527844DEST_PATH_IMAGE210
=2 MHz; then the frequency of the frequency agile signal is constructed to be 3150MHz and 3170MH in sequence according to the S1z, 3140MHz, 3180MHz, 3130MHz, 3190MHz, 3120MHz, 3200MHz, 3110MHz, 3210MHz, 3100MHz, 3220MHz, 3090MHz, 3230MHz, 3080MHz, 3240MHz, 3070MHz, 3250MHz, the corresponding odd-numbered sequence transmitting signal frequency is: 3150MHz, 3140MHz, 3130MHz, 3120MHz, 3110MHz, 3100MHz, 3090MHz, 3080MHz, and 3070 MHz;
the corresponding even-numbered sequence emission signal frequency is as follows in sequence: 3170MHz, 3180MHz, 3190MHz, 3200MHz, 3210MHz, 3220MHz, 3230MHz, 3240MHz and 3250 MHz.
Set target radial velocity
Figure 993460DEST_PATH_IMAGE211
=182m/s, initial distance
Figure 157463DEST_PATH_IMAGE212
=178 km. After the radar echo signals are subjected to pulse compression processing and MTD coherent processing, the range-Doppler processing results of all 18 echo signals are obtained, as shown in FIG. 4, and due to the influence of frequency agility, the target Doppler frequency value is spread to [ -100Hz,100Hz in the frequency domain]I.e. coherent accumulation of the frequency domain is not achieved.
According to S3, after pulse pressure processing is completed on the received 18 echo signals, odd and even sequence echo matrixes are respectively established
Figure 849476DEST_PATH_IMAGE213
And
Figure 258591DEST_PATH_IMAGE214
Figure 454081DEST_PATH_IMAGE215
，
further, the echo moment after the suppression of coupling interference items such as frequency, speed and the like is obtained after the phase cancellation processing
Figure 588652DEST_PATH_IMAGE216
And
Figure 502381DEST_PATH_IMAGE217
to, for
Figure 980767DEST_PATH_IMAGE218
And performing MTD processing on the echo matrix to obtain a range-doppler processing result of all odd-numbered sequence echo signals, as shown in fig. 5, it can be seen that only one target peak appears on a doppler domain at the distance of the target, and the amplitude value of the target peak is much larger than that in fig. 4.
The effectiveness of the method for improving the low interception performance and the anti-interference performance of the radar provided by the invention is proved by the simulation comparison of fig. 4 and fig. 5.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (4)

1. A method for improving low interception and interference resistance of a radar is characterized by comprising the following steps:
s1, constructing a frequency agile transmitting signal;
the frequency agile signal adopts the LFM signal form in the pulse, and the center frequency of the LFM signal with different transmission periods is according to
Figure 49974DEST_PATH_IMAGE001
The method is changed in an agile way, wherein,
Figure 322823DEST_PATH_IMAGE002
；
Figure 222384DEST_PATH_IMAGE003
；
Figure 973302DEST_PATH_IMAGE004
is a rounding operation to zero;
Figure 268017DEST_PATH_IMAGE005
is a center frequency of frequency agility;
the stepping frequency agile signal works at equal pulse repetition intervals, under the condition of neglecting the influence of amplitude
Figure 711768DEST_PATH_IMAGE006
The expression of each transmitting signal is as follows:
Figure 334510DEST_PATH_IMAGE007
wherein,
Figure 644445DEST_PATH_IMAGE008
is the intra-pulse frequency modulation slope;
Figure 669033DEST_PATH_IMAGE009
is a frequency step interval;
Figure 408319DEST_PATH_IMAGE010
pulse width for transmitting signal;
Figure 518357DEST_PATH_IMAGE011
；
Figure 611078DEST_PATH_IMAGE012
is the total time;
Figure 519866DEST_PATH_IMAGE013
is a slow time;
Figure 305419DEST_PATH_IMAGE014
the time is fast;
Figure 168333DEST_PATH_IMAGE015
a pulse repetition period for the transmitted signal;
s2, carrying out pulse compression processing on the received echo signal
S201, constructing a radar echo signal:
for the first
Figure 189379DEST_PATH_IMAGE016
A frequency-agile transmitting pulse and distance
Figure 188559DEST_PATH_IMAGE017
The expression of the echo of the moving target is as follows:
Figure 646478DEST_PATH_IMAGE018
wherein,
Figure 262267DEST_PATH_IMAGE019
the target distance at the moment of time is
Figure 962370DEST_PATH_IMAGE020
；
Figure 816057DEST_PATH_IMAGE021
Is the target initial distance;
Figure 441948DEST_PATH_IMAGE022
is the target speed;
Figure 13875DEST_PATH_IMAGE023
is the speed of light;
Figure 376723DEST_PATH_IMAGE024
the coherent processing time;
s202, after the received radar echo data is subjected to pulse compression processing, the obtained pulse pressure echo signal is as follows:
Figure 350495DEST_PATH_IMAGE025
wherein,
Figure 648752DEST_PATH_IMAGE026
；
Figure 209440DEST_PATH_IMAGE027
is the speed of light;
Figure 251345DEST_PATH_IMAGE028
is the transmission signal bandwidth;
Figure 938679DEST_PATH_IMAGE029
receiving the serial number of the echo signal;
s203, setting
Figure 407837DEST_PATH_IMAGE030
For pulse pressure echo signals
Figure 954356DEST_PATH_IMAGE031
The phase term of (2) then has:
Figure 298488DEST_PATH_IMAGE032
agile the center frequency in S1
Figure 981273DEST_PATH_IMAGE033
Carry-in phase
Figure 152491DEST_PATH_IMAGE034
And unfolding the phase term to obtain:
Figure 920727DEST_PATH_IMAGE035
wherein, frequency is converted
Figure 429069DEST_PATH_IMAGE036
Distance to
Figure 467825DEST_PATH_IMAGE037
Coupled phase term of
Figure 544366DEST_PATH_IMAGE038
The frequency-agile and speed-dependent coupled phase term is
Figure 799898DEST_PATH_IMAGE039
The coupling term is related to the number of emitted pulses or time and is not a constant term;
the above-mentioned
Figure 721717DEST_PATH_IMAGE040
And said
Figure 503729DEST_PATH_IMAGE041
Therefore, the radar signal phase does not have the linear phase characteristic, and the radar signal phase can be compatible with the radar coherent processing technology only by carrying out cancellation or suppression processing on the radar signal phase.
2. The method for improving low interception and interference immunity of radar according to claim 1, further comprising:
s3, frequency agile signal phase cancellation processing:
s301, constructing a frequency agile echo matrix;
because the frequency agility mode is odd-even sequence coherent step agility, in order to realize coherent processing, two echo matrixes are constructed for the frequency agility echo signals after pulse compression processing, and the two echo matrixes are respectively odd sequence echo matrixes formed by odd sequence step frequency signals
Figure 984126DEST_PATH_IMAGE042
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 992534DEST_PATH_IMAGE043
；
Wherein,
Figure 718044DEST_PATH_IMAGE044
counting the number of points after pulse pressure processing for each echo signal;
Figure 229928DEST_PATH_IMAGE045
the number of pulses of the odd-numbered sequence echo matrix,
Figure 507326DEST_PATH_IMAGE046
the number of pulses of the even sequence echo matrix.
3. The method of claim 2, wherein the step S3 further comprises:
s302, for the odd-numbered sequence echo matrix after pulse pressure processing
Figure 250633DEST_PATH_IMAGE047
The data after pulse pressure processing will be
Figure 45414DEST_PATH_IMAGE048
And
Figure 146225DEST_PATH_IMAGE049
and (3) carrying out conjugate multiplication on the echo signals of two adjacent odd-numbered sequences to obtain a new echo signal:
Figure 735469DEST_PATH_IMAGE050
；
Figure 217004DEST_PATH_IMAGE051
wherein,
Figure 284317DEST_PATH_IMAGE052
，
Figure 629848DEST_PATH_IMAGE053
odd serial numbers for receiving echo signals;
Figure 389994DEST_PATH_IMAGE054
；
Figure 329131DEST_PATH_IMAGE055
；
then
Figure 967179DEST_PATH_IMAGE056
The phase of (d) can be expressed as:
Figure 42582DEST_PATH_IMAGE057
Figure 239208DEST_PATH_IMAGE058
can be further simplified into
Figure 790275DEST_PATH_IMAGE059
According to the formula, the compound has the advantages of,
Figure 199391DEST_PATH_IMAGE060
and
Figure 893415DEST_PATH_IMAGE061
is a constant term independent of time, and has no influence on
Figure 995364DEST_PATH_IMAGE062
Of (2) phase referenceC, processing;
Figure 909093DEST_PATH_IMAGE063
is time of day
Figure 246533DEST_PATH_IMAGE064
A linear term of (d);
s303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 562108DEST_PATH_IMAGE065
The data after pulse pressure processing will be
Figure 70843DEST_PATH_IMAGE066
And
Figure 471869DEST_PATH_IMAGE067
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 347421DEST_PATH_IMAGE068
，
Figure 517502DEST_PATH_IMAGE069
；
Wherein,
Figure 961253DEST_PATH_IMAGE070
，
Figure 348110DEST_PATH_IMAGE071
even serial numbers for receiving echo signals;
Figure 902719DEST_PATH_IMAGE072
；
Figure 192886DEST_PATH_IMAGE073
；
then
Figure 932172DEST_PATH_IMAGE074
The phase of (a) is expressed as:
Figure 42210DEST_PATH_IMAGE075
Figure 901975DEST_PATH_IMAGE076
further can be simplified into:
Figure 46649DEST_PATH_IMAGE077
according to the formula, the compound has the advantages of,
Figure 566623DEST_PATH_IMAGE078
and
Figure 429537DEST_PATH_IMAGE079
is a constant term independent of time, and has no influence on
Figure 450583DEST_PATH_IMAGE080
Performing coherent processing;
Figure 948298DEST_PATH_IMAGE081
is time of day
Figure 904752DEST_PATH_IMAGE082
The linear term of (c).
4. The method of claim 3, further comprising:
s4 frequency agile signal detection fusion processing
In signal processing, a new odd-numbered sequence echo matrix is obtained through phase cancellation processing
Figure 989383DEST_PATH_IMAGE083
And a new even sequence echo matrix
Figure 548540DEST_PATH_IMAGE084
Performing coherent detection processing such as clutter suppression and CFAR detection respectively to obtain a target detection result;
when the radar is not subject to interference, the new odd sequence echo matrix
Figure 402227DEST_PATH_IMAGE085
And said new even sequence echo matrix
Figure 284908DEST_PATH_IMAGE086
Carrying out 1/2 non-coherent accumulation on the detection result;
when the radar is interfered, selecting the new odd sequence echo matrix which is not interfered
Figure 856835DEST_PATH_IMAGE087
Or the new even sequence echo matrix
Figure 95049DEST_PATH_IMAGE088
And outputting a detection result.
CN202210007712.0A 2022-01-06 2022-01-06 Method for improving low interception performance and anti-interference performance of radar Active CN114019462B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210007712.0A CN114019462B (en) 2022-01-06 2022-01-06 Method for improving low interception performance and anti-interference performance of radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210007712.0A CN114019462B (en) 2022-01-06 2022-01-06 Method for improving low interception performance and anti-interference performance of radar

Publications (2)

Publication Number Publication Date
CN114019462A true CN114019462A (en) 2022-02-08
CN114019462B CN114019462B (en) 2022-04-05

Family

ID=80069864

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210007712.0A Active CN114019462B (en) 2022-01-06 2022-01-06 Method for improving low interception performance and anti-interference performance of radar

Country Status (1)

Country Link
CN (1) CN114019462B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114779177A (en) * 2022-06-17 2022-07-22 中国人民解放军空军预警学院 Coherent processing method for frequency diversity waveform
CN115327491A (en) * 2022-10-18 2022-11-11 中国人民解放军空军预警学院 Method for resisting transfer type false target interference by radar inter-pulse waveform agility
CN115453490A (en) * 2022-11-10 2022-12-09 艾索信息股份有限公司 Coherent accumulation method, device and equipment based on radar signals and storage medium
CN116449313A (en) * 2023-06-14 2023-07-18 中国人民解放军空军预警学院 Main lobe suppression noise interference resisting method and device for radar based on intra-pulse multi-carrier frequency signals
CN117784076A (en) * 2024-02-27 2024-03-29 中国人民解放军空军预警学院 Coherent processing method of frequency agility and frequency diversity

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702018A (en) * 2009-11-12 2010-05-05 中国电子科技集团公司第四十一研究所 Calibrating method for big modulation bandwidth linear FM signal frequency response
CN106796282A (en) * 2014-05-12 2017-05-31 奥托立夫Asp公司 The radar system and method in distance, relative velocity and the orientation of object are determined using continuous wave and chirp signals
CN109143179A (en) * 2018-07-26 2019-01-04 清华大学 A kind of frequency-agile radar signal processing method and device based on change repetition technology
US20190086531A1 (en) * 2017-09-21 2019-03-21 Hach Company Frequency profiles for non-contact range measurement with multi-scale analysis
EP3796038A1 (en) * 2019-09-17 2021-03-24 Aptiv Technologies Limited Object range and velocity detection from varying radar pulse repetition times
CN113009427A (en) * 2021-02-25 2021-06-22 中国人民解放军空军预警学院 Multi-domain agility anti-interference method for phased array radar
CN113721216A (en) * 2021-08-30 2021-11-30 西安电子科技大学 Target detection waveform optimization and processing method of agile coherent radar
CN113884992A (en) * 2021-10-20 2022-01-04 西安电子科技大学 Self-adaptive anti-interference method of frequency agile radar

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702018A (en) * 2009-11-12 2010-05-05 中国电子科技集团公司第四十一研究所 Calibrating method for big modulation bandwidth linear FM signal frequency response
CN106796282A (en) * 2014-05-12 2017-05-31 奥托立夫Asp公司 The radar system and method in distance, relative velocity and the orientation of object are determined using continuous wave and chirp signals
US20190086531A1 (en) * 2017-09-21 2019-03-21 Hach Company Frequency profiles for non-contact range measurement with multi-scale analysis
CN109143179A (en) * 2018-07-26 2019-01-04 清华大学 A kind of frequency-agile radar signal processing method and device based on change repetition technology
EP3796038A1 (en) * 2019-09-17 2021-03-24 Aptiv Technologies Limited Object range and velocity detection from varying radar pulse repetition times
CN113009427A (en) * 2021-02-25 2021-06-22 中国人民解放军空军预警学院 Multi-domain agility anti-interference method for phased array radar
CN113721216A (en) * 2021-08-30 2021-11-30 西安电子科技大学 Target detection waveform optimization and processing method of agile coherent radar
CN113884992A (en) * 2021-10-20 2022-01-04 西安电子科技大学 Self-adaptive anti-interference method of frequency agile radar

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
J.H. HUGHEN 等: "Demonstration of a SAR mode for a lightweight 35 GHz MMW radar", 《PROCEEDINGS OF 1994 IEEE NATIONAL RADAR CONFERENCE》 *
卢雨祥 等: "基于分组对消的随机PRI雷达MTI处理方法", 《舰船电子对抗》 *
孙林 等: "调频步进频雷达中距离起点误差分析", 《电子与信息学报》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114779177A (en) * 2022-06-17 2022-07-22 中国人民解放军空军预警学院 Coherent processing method for frequency diversity waveform
CN114779177B (en) * 2022-06-17 2022-09-30 中国人民解放军空军预警学院 Coherent processing method for frequency diversity waveform
CN115327491A (en) * 2022-10-18 2022-11-11 中国人民解放军空军预警学院 Method for resisting transfer type false target interference by radar inter-pulse waveform agility
CN115453490A (en) * 2022-11-10 2022-12-09 艾索信息股份有限公司 Coherent accumulation method, device and equipment based on radar signals and storage medium
CN116449313A (en) * 2023-06-14 2023-07-18 中国人民解放军空军预警学院 Main lobe suppression noise interference resisting method and device for radar based on intra-pulse multi-carrier frequency signals
CN116449313B (en) * 2023-06-14 2023-09-12 中国人民解放军空军预警学院 Main lobe suppression noise interference resisting method and device for radar based on intra-pulse multi-carrier frequency signals
CN117784076A (en) * 2024-02-27 2024-03-29 中国人民解放军空军预警学院 Coherent processing method of frequency agility and frequency diversity
CN117784076B (en) * 2024-02-27 2024-05-14 中国人民解放军空军预警学院 Coherent processing method of frequency agility and frequency diversity

Also Published As

Publication number Publication date
CN114019462B (en) 2022-04-05

Similar Documents

Publication Publication Date Title
CN114019462B (en) Method for improving low interception performance and anti-interference performance of radar
CN111693983B (en) Complementary waveform construction method and module, cognitive radar system and waveform emission method
CN109613506B (en) Method for detecting target echo signal of random frequency hopping repetition frequency agility radar
CN109164421B (en) Target detection method based on two-dimensional reconstruction algorithm
CN112748403B (en) Nonlinear frequency modulation pulse train waveform design method based on frequency spectrum modulation agility
CN110988864B (en) MTI radar speed measuring method with frequency agility
CN101470202A (en) Pulse Doppler radar system and its signal processing method
CN110297233B (en) LFMCW array radar signal parallel pipelining processing method
CN110837081A (en) High-speed target detection method based on P/D band radar signal fusion processing
CN116068501B (en) Method for generating anti-interference radio altimeter modulation signal
CN105044712A (en) Microwave fence radar apparatus and target detection method
CN109283497B (en) Bistatic FDA-MIMO radar range deception jamming identification method
CN109975775B (en) Radar echo semi-actual measurement data simulation method
CN113376601B (en) Frequency agile radar sidelobe suppression method based on CLEAN algorithm
CN103064065B (en) Waveform design for double-cycle pinch-off type pseudo-random code and signal processing method for echo
CN116087942B (en) Method for generating modulating signal of aeronautical altimeter
CN114764136A (en) Radar anti-interference waveform generation method based on multi-time scale coupling network
CN105068057A (en) Radar active deception jamming resistance method based on waveform agility
CN115480222A (en) Radar interference technical method based on frequency control array jammer
Hague et al. The generalized sinusoidal frequency modulated waveform for continuous active sonar
CN102298141A (en) Airborne pulse doppler radar iterative solution range ambiguity method
CN106324589B (en) A kind of measurement method of parameters and electronic equipment of mobile target
CN107861116B (en) Radar ranging optimization method
CN113640752A (en) Waveform design method based on inter-pulse phase spectrum double agility
CN115327491B (en) Method for resisting transfer type false target interference by waveform agility between radar pulses

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant