CN114019462B - 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

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CN114019462B
CN114019462B CN202210007712.0A CN202210007712A CN114019462B CN 114019462 B CN114019462 B CN 114019462B CN 202210007712 A CN202210007712 A CN 202210007712A CN 114019462 B CN114019462 B CN 114019462B
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CN114019462A (en
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朱振波
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Air Force Early Warning Academy
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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
    • 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

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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 898892DEST_PATH_IMAGE001
The method is changed in an agile way, wherein,
Figure 2983DEST_PATH_IMAGE002
；
Figure 782720DEST_PATH_IMAGE003
；
Figure 177929DEST_PATH_IMAGE004
is a rounding operation to zero;
Figure 929985DEST_PATH_IMAGE005
is a frequency agile center frequencyRate;
the stepping frequency agile signal works at equal pulse repetition intervals, under the condition of neglecting the influence of amplitude
Figure 752447DEST_PATH_IMAGE006
The expression of each transmitting signal is as follows:
Figure 19480DEST_PATH_IMAGE007
wherein the content of the first and second substances,
Figure 405331DEST_PATH_IMAGE008
is the intra-pulse frequency modulation slope;
Figure 74210DEST_PATH_IMAGE009
is a frequency step interval;
Figure 5257DEST_PATH_IMAGE010
pulse width for transmitting signal;
Figure 759586DEST_PATH_IMAGE011
；
Figure 496598DEST_PATH_IMAGE012
is the total time;
Figure 206934DEST_PATH_IMAGE013
is a slow time;
Figure 636778DEST_PATH_IMAGE014
the time is fast;
Figure 816087DEST_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 91210DEST_PATH_IMAGE016
A frequency-agile transmitting pulse and distance
Figure 921632DEST_PATH_IMAGE017
The expression of the echo of the moving target is as follows:
Figure 256798DEST_PATH_IMAGE018
wherein the content of the first and second substances,
Figure 985720DEST_PATH_IMAGE019
the target distance at the moment of time is
Figure 2218DEST_PATH_IMAGE020
；
Figure 500195DEST_PATH_IMAGE021
Is the target initial distance;
Figure 271842DEST_PATH_IMAGE022
is the target speed;
Figure 409431DEST_PATH_IMAGE023
is the speed of light;
Figure 291936DEST_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 582103DEST_PATH_IMAGE025
wherein the content of the first and second substances,
Figure 524652DEST_PATH_IMAGE026
；
Figure 149537DEST_PATH_IMAGE027
is the speed of light;
Figure 570154DEST_PATH_IMAGE028
is the transmission signal bandwidth;
Figure 42724DEST_PATH_IMAGE029
receiving the serial number of the echo signal;
s203, setting
Figure 93856DEST_PATH_IMAGE030
For pulse pressure echo signals
Figure 19087DEST_PATH_IMAGE031
The phase term of (2) then has:
Figure 243395DEST_PATH_IMAGE032
agile the center frequency in S1
Figure 491842DEST_PATH_IMAGE033
Carry-in phase
Figure 776193DEST_PATH_IMAGE034
And unfolding the phase term to obtain:
Figure 188720DEST_PATH_IMAGE035
wherein, frequency is converted
Figure 154402DEST_PATH_IMAGE036
Distance to
Figure 335985DEST_PATH_IMAGE037
Coupled phase term of
Figure 525658DEST_PATH_IMAGE038
The frequency-agile and speed-dependent coupled phase term is
Figure 612431DEST_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 178542DEST_PATH_IMAGE040
And said
Figure 417893DEST_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 778467DEST_PATH_IMAGE042
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 352537DEST_PATH_IMAGE043
；
Wherein the content of the first and second substances,
Figure 722338DEST_PATH_IMAGE044
counting the number of points after pulse pressure processing for each echo signal;
Figure 612934DEST_PATH_IMAGE045
the number of pulses of the odd-numbered sequence echo matrix,
Figure 409989DEST_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 956508DEST_PATH_IMAGE047
The data after pulse pressure processing will be
Figure 316951DEST_PATH_IMAGE048
And
Figure 327632DEST_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 295588DEST_PATH_IMAGE050
；
Figure 329403DEST_PATH_IMAGE051
wherein the content of the first and second substances,
Figure 41007DEST_PATH_IMAGE052
，
Figure 906195DEST_PATH_IMAGE053
odd serial numbers for receiving echo signals;
Figure 232003DEST_PATH_IMAGE054
；
Figure 815431DEST_PATH_IMAGE055
；
then
Figure 65147DEST_PATH_IMAGE056
The phase of (d) can be expressed as:
Figure 988104DEST_PATH_IMAGE057
Figure 297862DEST_PATH_IMAGE058
can be further simplified into
Figure 368586DEST_PATH_IMAGE059
According to the formula, the compound has the advantages of,
Figure 608944DEST_PATH_IMAGE060
and
Figure 448724DEST_PATH_IMAGE061
is a constant term independent of time, and has no influence on
Figure 929384DEST_PATH_IMAGE062
Performing coherent processing;
Figure 159508DEST_PATH_IMAGE063
is time of day
Figure 16605DEST_PATH_IMAGE064
A linear term of (d);
s303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 710892DEST_PATH_IMAGE065
The data after pulse pressure processing will be
Figure 549404DEST_PATH_IMAGE066
And
Figure 594720DEST_PATH_IMAGE067
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 989929DEST_PATH_IMAGE068
，
Figure 476406DEST_PATH_IMAGE069
；
Wherein the content of the first and second substances,
Figure 564447DEST_PATH_IMAGE070
，
Figure 831481DEST_PATH_IMAGE071
even serial numbers for receiving echo signals;
Figure 217331DEST_PATH_IMAGE072
；
Figure 620631DEST_PATH_IMAGE073
；
then
Figure 879574DEST_PATH_IMAGE074
The phase of (a) is expressed as:
Figure 571586DEST_PATH_IMAGE075
Figure 308598DEST_PATH_IMAGE076
further can be simplified into:
Figure 831984DEST_PATH_IMAGE077
according to the formula, the compound has the advantages of,
Figure 261828DEST_PATH_IMAGE078
and
Figure 424825DEST_PATH_IMAGE079
is a constant term independent of time, and has no influence on
Figure 965528DEST_PATH_IMAGE080
Performing coherent processing;
Figure 608998DEST_PATH_IMAGE081
is time of day
Figure 881848DEST_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 610770DEST_PATH_IMAGE083
And a new even sequence echo matrix
Figure 689584DEST_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 187561DEST_PATH_IMAGE085
And said new even sequence echo matrix
Figure 880580DEST_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 96798DEST_PATH_IMAGE087
Or the new even sequence echo matrix
Figure 979303DEST_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 269470DEST_PATH_IMAGE089
The method is changed in an agile way, wherein,
Figure 212018DEST_PATH_IMAGE090
；
Figure 649953DEST_PATH_IMAGE091
；
Figure 257520DEST_PATH_IMAGE092
is a rounding operation to zero;
Figure 730090DEST_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 577960DEST_PATH_IMAGE094
The expression of each transmitting signal is as follows:
Figure 440874DEST_PATH_IMAGE095
wherein the content of the first and second substances,
Figure 665182DEST_PATH_IMAGE096
is the intra-pulse frequency modulation slope;
Figure 992258DEST_PATH_IMAGE097
is a frequency step interval;
Figure 463560DEST_PATH_IMAGE098
pulse width for transmitting signal;
Figure 876087DEST_PATH_IMAGE099
；
Figure 638506DEST_PATH_IMAGE100
is the total time;
Figure 757772DEST_PATH_IMAGE101
is a slow time;
Figure 213024DEST_PATH_IMAGE102
the time is fast;
Figure 299798DEST_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 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 signal center frequencies of the frequency agile signals, the odd number emission pulse sequences and the even number emission pulse sequences constructed in the step are respectively stepped
Figure 865908DEST_PATH_IMAGE104
、
Figure 901997DEST_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 465834DEST_PATH_IMAGE106
Step-by-step agile, even-order sequence transmit pulses (e.g. forn=2, 4, 6..) inter-pulse frequency by frequency interval
Figure 852953DEST_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 957175DEST_PATH_IMAGE108
A frequency-agile transmitting pulse and distance
Figure 300301DEST_PATH_IMAGE109
The expression of the echo of the moving target is as follows:
Figure 97355DEST_PATH_IMAGE110
wherein the content of the first and second substances,
Figure 706191DEST_PATH_IMAGE111
the target distance at the moment of time is
Figure 879683DEST_PATH_IMAGE112
；
Figure 828048DEST_PATH_IMAGE113
Is the target initial distance;
Figure 796004DEST_PATH_IMAGE114
is the target speed;
Figure 892136DEST_PATH_IMAGE115
is the speed of light;
Figure 338161DEST_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 655878DEST_PATH_IMAGE117
wherein the content of the first and second substances,
Figure 794736DEST_PATH_IMAGE026
；
Figure 378164DEST_PATH_IMAGE118
is the speed of light;
Figure 627880DEST_PATH_IMAGE119
is the transmission signal bandwidth;
Figure 550836DEST_PATH_IMAGE120
receiving the serial number of the echo signal;
s203, setting
Figure 860595DEST_PATH_IMAGE121
For pulse pressure echo signals
Figure 931319DEST_PATH_IMAGE122
The phase term of (2) then has:
Figure 171676DEST_PATH_IMAGE123
agile the center frequency in S1
Figure 11456DEST_PATH_IMAGE124
Carry-in phase
Figure 492116DEST_PATH_IMAGE125
And unfolding the phase term to obtain:
Figure 784557DEST_PATH_IMAGE126
wherein, frequency is converted
Figure 579338DEST_PATH_IMAGE127
Distance to
Figure 273625DEST_PATH_IMAGE128
Coupled phase term of
Figure 925186DEST_PATH_IMAGE129
The frequency-agile and speed-dependent coupled phase term is
Figure 970502DEST_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 552662DEST_PATH_IMAGE131
And said
Figure 101455DEST_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 the stagger stepping agility of the odd-even sequence, in order to realize the coherent processing, two echoes are constructed for the frequency agility echo signal after the pulse compression processingMatrices, respectively, of odd-sequence echo matrices formed by odd-sequence step-frequency signals
Figure 456530DEST_PATH_IMAGE134
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 327534DEST_PATH_IMAGE135
；
Wherein the content of the first and second substances,
Figure 255356DEST_PATH_IMAGE136
counting the number of points after pulse pressure processing for each echo signal;
Figure 744106DEST_PATH_IMAGE137
the number of pulses of the odd-numbered sequence echo matrix,
Figure 933648DEST_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 457033DEST_PATH_IMAGE139
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 621298DEST_PATH_IMAGE140
Two echo matrices.
Through the processing, all the pulse-pressure echo signals are divided into two parts, namely an echo matrix
Figure 800607DEST_PATH_IMAGE141
And
Figure 341310DEST_PATH_IMAGE142
wherein
Figure 719201DEST_PATH_IMAGE143
For transmitting signals at intervals of frequency
Figure 319947DEST_PATH_IMAGE144
A step-frequency echo matrix that is step-agile,
Figure 970240DEST_PATH_IMAGE145
for transmitting signals at intervals of frequency
Figure 314634DEST_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 812611DEST_PATH_IMAGE147
The data after pulse pressure processing will be
Figure 256362DEST_PATH_IMAGE148
And
Figure 472580DEST_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 355085DEST_PATH_IMAGE150
；
Figure 707569DEST_PATH_IMAGE151
wherein the content of the first and second substances,
Figure 571488DEST_PATH_IMAGE152
，
Figure 9423DEST_PATH_IMAGE153
odd serial numbers for receiving echo signals;
Figure 695619DEST_PATH_IMAGE154
；
Figure 840293DEST_PATH_IMAGE155
；
then
Figure 953742DEST_PATH_IMAGE156
The phase of (d) can be expressed as:
Figure 878973DEST_PATH_IMAGE157
Figure 313669DEST_PATH_IMAGE158
Figure 640745DEST_PATH_IMAGE159
can be further simplified into
Figure 925096DEST_PATH_IMAGE160
According to the formula, the compound has the advantages of,
Figure 72044DEST_PATH_IMAGE161
and
Figure 37726DEST_PATH_IMAGE162
is a constant term independent of time, and has no influence on
Figure 219308DEST_PATH_IMAGE163
Performing coherent processing;
Figure 674560DEST_PATH_IMAGE164
is time of day
Figure 761334DEST_PATH_IMAGE165
The linear term of (c).
Visible, pulse-pressure processed odd-number sequence echo matrix
Figure 327445DEST_PATH_IMAGE166
Then will be first
Figure 363534DEST_PATH_IMAGE167
And
Figure 989687DEST_PATH_IMAGE168
conjugate multiplication of two adjacent odd-numbered sequence echo signals, i.e.
Figure 48910DEST_PATH_IMAGE169
To obtain a new odd-sequence echo matrix
Figure 418711DEST_PATH_IMAGE170
And only a constant term and a time-related linear term are reserved in the phase term, the frequency, distance and speed coupling interference terms are eliminated, the tight coupling processing among the speed, the distance and the frequency is realized, and the subsequent MTI, MTD or PD and other coherent processing can be compatible.
S303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 574886DEST_PATH_IMAGE171
The data after pulse pressure processing will be
Figure 371941DEST_PATH_IMAGE172
And
Figure 167728DEST_PATH_IMAGE173
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 75641DEST_PATH_IMAGE174
，
Figure 86322DEST_PATH_IMAGE175
；
Wherein the content of the first and second substances,
Figure 54278DEST_PATH_IMAGE176
，
Figure 88093DEST_PATH_IMAGE177
even serial numbers for receiving echo signals;
Figure 799697DEST_PATH_IMAGE178
；
Figure 930464DEST_PATH_IMAGE179
；
then
Figure 256272DEST_PATH_IMAGE180
The phase of (a) is expressed as:
Figure 574121DEST_PATH_IMAGE181
Figure 89416DEST_PATH_IMAGE182
further can be simplified into:
Figure 74690DEST_PATH_IMAGE183
according to the formula, the compound has the advantages of,
Figure 322131DEST_PATH_IMAGE184
and
Figure 127276DEST_PATH_IMAGE185
is a constant term independent of time, and has no influence on
Figure 180683DEST_PATH_IMAGE186
Performing coherent processing;
Figure 20463DEST_PATH_IMAGE187
is time of day
Figure 688074DEST_PATH_IMAGE188
The linear term of (c).
Visible even number sequence echo matrix after pulse pressure processing
Figure 246094DEST_PATH_IMAGE189
Then will be first
Figure 837612DEST_PATH_IMAGE190
And
Figure 735161DEST_PATH_IMAGE191
conjugate multiplication of two adjacent odd-numbered sequence echo signals, i.e.
Figure 386722DEST_PATH_IMAGE192
To obtain a new even sequence echo matrix
Figure 166459DEST_PATH_IMAGE193
And the phase term only retains a constant term and a time-dependent linear term, the frequency, distance and speed coupling interference terms are eliminated, the tight coupling processing among the speed, distance and frequency is realized, and the following 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 561669DEST_PATH_IMAGE194
And a new even sequence echo matrix
Figure 562992DEST_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 385454DEST_PATH_IMAGE196
And a new even sequence echo matrix
Figure 652487DEST_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 851388DEST_PATH_IMAGE198
And a new even sequence echo matrix
Figure 457949DEST_PATH_IMAGE199
Carrying out 1/2 non-coherent accumulation on the detection result;
namely, it is
Figure 451313DEST_PATH_IMAGE200
Or
Figure 205643DEST_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 208234DEST_PATH_IMAGE202
Or the even-numbered sequence echo matrix
Figure 918570DEST_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 82835DEST_PATH_IMAGE204
，
Figure 324460DEST_PATH_IMAGE205
transmitting a linear frequency-modulated signal with a number of coherent pulses of
Figure 865163DEST_PATH_IMAGE206
The repetition frequency is 200Hz (i.e.
Figure 180738DEST_PATH_IMAGE207
) Pulse width of signal
Figure 781483DEST_PATH_IMAGE208
=
Figure 244826DEST_PATH_IMAGE209
Bandwidth, bandwidth
Figure 776170DEST_PATH_IMAGE210
=2 MHz; then according to the S1, constructing the agile frequency signals with the frequency of 3150MHz, 3170MHz, 3140MHz, 3180MHz, 3130MHz, 3190MHz, 3120MHz, 3200MHz, 3110MHz, 3210MHz, 3100MHz, 3220MHz, 3090MHz, 3230MHz, 3080MHz, 3240MHz, 3070MHz, 3250MHz in sequence, and the corresponding odd-numbered sequence transmitting signal frequency of: 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 8568DEST_PATH_IMAGE211
=182m/s, initialA distance of
Figure 780215DEST_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 730854DEST_PATH_IMAGE213
And
Figure 551042DEST_PATH_IMAGE214
Figure 903526DEST_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 846074DEST_PATH_IMAGE216
And
Figure 284009DEST_PATH_IMAGE217
to, for
Figure 157156DEST_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 (3)

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 440552DEST_PATH_IMAGE001
The method is changed in an agile way, wherein,
Figure 801127DEST_PATH_IMAGE002
；
Figure 188246DEST_PATH_IMAGE003
；
Figure 620364DEST_PATH_IMAGE004
is a rounding operation to zero;
Figure 510960DEST_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 308014DEST_PATH_IMAGE006
The expression of each transmitting signal is as follows:
Figure 916850DEST_PATH_IMAGE007
wherein the content of the first and second substances,
Figure 152659DEST_PATH_IMAGE008
is the intra-pulse frequency modulation slope;
Figure 163341DEST_PATH_IMAGE009
is a frequency step interval;
Figure 131297DEST_PATH_IMAGE010
pulse width for transmitting signal;
Figure 227429DEST_PATH_IMAGE011
；
Figure 939033DEST_PATH_IMAGE012
is the total time;
Figure 866538DEST_PATH_IMAGE013
is a slow time;
Figure 5395DEST_PATH_IMAGE014
the time is fast;
Figure 588823DEST_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 838539DEST_PATH_IMAGE016
A frequency-agile transmitting pulse and distance
Figure 823812DEST_PATH_IMAGE017
The expression of the echo of the moving target is as follows:
Figure 195888DEST_PATH_IMAGE018
wherein the content of the first and second substances,
Figure 266612DEST_PATH_IMAGE019
the target distance at the moment of time is
Figure 320019DEST_PATH_IMAGE020
；
Figure 159799DEST_PATH_IMAGE021
Is the target initial distance;
Figure 702775DEST_PATH_IMAGE022
is the target speed;
Figure 995216DEST_PATH_IMAGE023
is the speed of light;
Figure 852314DEST_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 546601DEST_PATH_IMAGE025
wherein the content of the first and second substances,
Figure 198162DEST_PATH_IMAGE026
；
Figure 305795DEST_PATH_IMAGE027
is the speed of light;
Figure 701004DEST_PATH_IMAGE028
is the transmission signal bandwidth;
Figure 249797DEST_PATH_IMAGE029
receiving the serial number of the echo signal;
s203, setting
Figure 337839DEST_PATH_IMAGE030
For pulse pressure echo signals
Figure 667189DEST_PATH_IMAGE031
The phase term of (2) then has:
Figure 866089DEST_PATH_IMAGE032
agile the center frequency in S1
Figure 269389DEST_PATH_IMAGE033
Carry-in phase
Figure 528332DEST_PATH_IMAGE034
And unfolding the phase term to obtain:
Figure 282661DEST_PATH_IMAGE035
wherein, frequency is converted
Figure 81990DEST_PATH_IMAGE036
Distance to
Figure 605375DEST_PATH_IMAGE037
Coupled phase term of
Figure 35220DEST_PATH_IMAGE038
The frequency-agile and speed-dependent coupled phase term is
Figure 11266DEST_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 614285DEST_PATH_IMAGE040
And said
Figure 257756DEST_PATH_IMAGE041
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 inhibition processing on the radar signal phase;
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 592923DEST_PATH_IMAGE042
Even-numbered sequence echo matrix formed by even-numbered sequence step frequency signals
Figure 321844DEST_PATH_IMAGE043
；
Wherein the content of the first and second substances,
Figure 462976DEST_PATH_IMAGE044
counting the number of points after pulse pressure processing for each echo signal;
Figure 960953DEST_PATH_IMAGE045
the number of pulses of the odd-numbered sequence echo matrix,
Figure 467021DEST_PATH_IMAGE046
the number of pulses of an even number sequence echo matrix;
s302, for the odd-numbered sequence echo matrix after pulse pressure processing
Figure 683239DEST_PATH_IMAGE047
The data after pulse pressure processing will be
Figure 565744DEST_PATH_IMAGE048
And
Figure 980545DEST_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 923093DEST_PATH_IMAGE050
；
s303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 361028DEST_PATH_IMAGE051
The data after pulse pressure processing will be
Figure 781645DEST_PATH_IMAGE052
And
Figure 316531DEST_PATH_IMAGE053
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 164401DEST_PATH_IMAGE054
，
S4 frequency agile signal detection fusion processing
In signal processing, a new odd-numbered sequence echo matrix is obtained through phase cancellation processing
Figure 89632DEST_PATH_IMAGE055
And a new even sequence echo matrix
Figure 313940DEST_PATH_IMAGE056
And respectively carrying out coherent detection processing to obtain target detection results.
2. The method of claim 1, wherein the step S3 further comprises:
s302, for the odd-numbered sequence echo matrix after pulse pressure processing
Figure 641016DEST_PATH_IMAGE047
The data after pulse pressure processing will be
Figure 987684DEST_PATH_IMAGE048
And
Figure 400211DEST_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 162630DEST_PATH_IMAGE050
；
Figure 344213DEST_PATH_IMAGE057
wherein the content of the first and second substances,
Figure 861782DEST_PATH_IMAGE058
，
Figure 761605DEST_PATH_IMAGE059
odd serial numbers for receiving echo signals;
Figure 327715DEST_PATH_IMAGE060
；
Figure 363805DEST_PATH_IMAGE061
；
then
Figure 989958DEST_PATH_IMAGE062
The phase of (d) can be expressed as:
Figure 439394DEST_PATH_IMAGE063
Figure 543616DEST_PATH_IMAGE064
can be further simplified into
Figure 699791DEST_PATH_IMAGE065
According to the formula, the compound has the advantages of,
Figure 496846DEST_PATH_IMAGE066
and
Figure 167998DEST_PATH_IMAGE067
is a constant term independent of time, and has no influence on
Figure 341491DEST_PATH_IMAGE068
Performing coherent processing;
Figure 352172DEST_PATH_IMAGE069
is time of day
Figure 320128DEST_PATH_IMAGE070
A linear term of (d);
s303, for the even-numbered sequence echo matrix after pulse pressure processing
Figure 416260DEST_PATH_IMAGE051
The data after pulse pressure processing will be
Figure 924602DEST_PATH_IMAGE052
And
Figure 55369DEST_PATH_IMAGE053
two adjacent even number sequence echo signals are multiplied in a conjugate mode to obtain a new echo signal
Figure 194226DEST_PATH_IMAGE054
，
Figure 777654DEST_PATH_IMAGE071
；
Wherein the content of the first and second substances,
Figure 89687DEST_PATH_IMAGE072
，
Figure 74960DEST_PATH_IMAGE073
even serial numbers for receiving echo signals;
Figure 384719DEST_PATH_IMAGE074
；
Figure 455443DEST_PATH_IMAGE075
；
then
Figure 508850DEST_PATH_IMAGE076
The phase of (a) is expressed as:
Figure 410947DEST_PATH_IMAGE077
Figure 891607DEST_PATH_IMAGE078
further can be simplified into:
Figure 184048DEST_PATH_IMAGE079
according to the formula, the compound has the advantages of,
Figure 41145DEST_PATH_IMAGE080
and
Figure 797749DEST_PATH_IMAGE081
is a constant term independent of time, and has no influence on
Figure 449310DEST_PATH_IMAGE082
Performing coherent processing;
Figure 494626DEST_PATH_IMAGE083
is time of day
Figure 889836DEST_PATH_IMAGE084
The linear term of (c).
3. The method for improving low interception and interference immunity of radar according to claim 2, 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 438629DEST_PATH_IMAGE055
And a new even sequence echo matrix
Figure 588987DEST_PATH_IMAGE056
Respectively carrying out coherent detection processing to obtain target detection results;
when the radar is not subject to interference, the new odd sequence echo matrix
Figure 856021DEST_PATH_IMAGE085
And said new even sequence echo matrix
Figure 789341DEST_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 458220DEST_PATH_IMAGE087
Or the new even sequence echo matrix
Figure 779480DEST_PATH_IMAGE088
And outputting a detection result.
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