CN116840804A - Speed false target suppression method and device based on dual carrier frequency pulse - Google Patents

Speed false target suppression method and device based on dual carrier frequency pulse Download PDF

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Publication number
CN116840804A
CN116840804A CN202311089790.0A CN202311089790A CN116840804A CN 116840804 A CN116840804 A CN 116840804A CN 202311089790 A CN202311089790 A CN 202311089790A CN 116840804 A CN116840804 A CN 116840804A
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speed
target
paths
echo
frequency
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CN116840804B (en
Inventor
张昭建
朱永哲
王永良
李槟槟
陈辉
陈浩
韩瑜
黄虎
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Air Force Early Warning Academy
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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
    • G01S7/41—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
    • G01S7/414—Discriminating targets with respect to background clutter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/581—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse modulated waves and based upon the Doppler effect resulting from movement of targets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures

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

Abstract

The invention discloses a speed false target suppression method based on dual carrier frequency pulse, which comprises the following steps: transmitting dual carrier frequency pulses with a certain frequency interval, after receiving dual carrier frequency mixed echoes, separating the dual carrier frequency pulse mixed echoes in a frequency domain through a frequency domain filter to form two channels, and then performing down-conversion processing and matched filtering processing to obtain two channels of echo data; FFT is carried out on the two paths of echo data between pulses to obtain Doppler frequency of signals in the echo, and the Doppler frequency is obtained according toConverting the motion speed into the motion speed; comparing the speeds of the moving targets estimated by the two paths of echo data respectively to identify true targets and false targets, wherein the speeds are consistent with each other, and the speeds are inconsistent with each other; setting a speed dimension filter according to a true target speedAnd the wave filter filters the two paths of echo data, and then performs weighted summation on the filtered data to realize detection of a true target and suppression of a false target. The invention also provides a corresponding speed false target suppression device based on the dual carrier frequency pulse.

Description

Speed false target suppression method and device based on dual carrier frequency pulse
Technical Field
The invention belongs to the technical field of signal processing, and particularly relates to a speed false target suppression method and device based on dual carrier frequency pulses.
Background
The Pulse Doppler (PD) radar has the distance resolution of the Pulse radar and the speed resolution of the continuous wave radar, can acquire the Doppler frequency of signals, has obvious advantages in the aspect of clutter suppression, and is widely applied to space-based early warning equipment. However, the radar is often interfered by enemy in the process of detecting the target, wherein speed deception interference is a typical deception interference, and the radar receives a plurality of signals with different Doppler frequencies by copying, doppler modulation and forwarding the radar signals, so that the radar detection and tracking errors are easily caused. The appearance of a large number of false targets makes it difficult for a radar to distinguish real target signals from the inside of the false targets, and even overload or saturation can occur when a radar signal processor processes echoes, so that serious influence is brought to the effectiveness of radar tracking and target detection. For the problem of suppressing coherent speed spoofing interference, an effective solution is still lacking, so that an effective speed true and false target identification method is needed, speed spoofing false targets can be effectively identified, true target speeds can be accurately obtained, and speed false targets can be filtered.
Therefore, an effective method for identifying true and false targets is needed, which can effectively identify speed spoofing false targets and accurately acquire the true target speed.
Disclosure of Invention
Therefore, the invention provides a speed false target suppression method based on dual carrier frequency pulse, which is used for overcoming the problems in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a speed decoy suppression method based on dual carrier frequency pulses, including the steps of:
step 1: the transmitting carrier frequencies are respectively and />The carrier frequency difference is required to be larger than the bandwidth of a radar transmitting signal, so that the double carrier frequency mixed echo signal is ensured not to be aliased on the frequency domain, the double carrier frequency mixed echo signal is convenient to separate, two paths of channels are formed after the double carrier frequency mixed echo signal is received and filtered by the frequency domain, and then the down-conversion processing and the matched filtering processing are carried out to obtain two paths of echo data and />；
Step 2: using echo data、/>Taking a fast Fourier transform (fast fourier transform, FFT) between the pulses to obtain the Doppler frequency of the signal within the echo, and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
step 3: comparing two paths of echo data、/>Respectively estimating the speeds of the moving targets, wherein the speeds are consistent with each other to be true target speeds and the speeds are inconsistent with each other to be false target speeds;
step 4: and setting a speed dimension filter according to the motion speed of the true target, filtering the two paths of echo data, and then carrying out weighted summation on the filtered data to realize detection of the true target and suppression of the false target.
In one embodiment of the present invention, the step 1 specifically includes:
transmitting two carrier frequencies respectively and />Is based on the radar speed measurement principle +.>It can be known that the Doppler frequency of the target is influenced by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the two paths of echo data are different and proportional, and the proportion depends on the proportion of the carrier frequencies of the two paths of transmission pulse trains; however, the mode of the jammer for generating speed deception false target interference is to perform Doppler frequency modulation on intercepted radar pulse, and the Doppler frequency change caused by the modulation is always fixed;
assume distanceThere is a speed of +.>Target, no.)>The target echo received by each pulse repetition period is subjected to matched filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is the target Doppler frequency;
assuming that there is a speed decoy disturbance, the generatorThe radar echo is subjected to Doppler modulation, and the Doppler modulation is as followsThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal isThe Doppler guiding vectors of the targets in the double carrier frequencies can be obtained respectively as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8)
hypothetical emissionsThe pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
In one embodiment of the present invention, the step 2 specifically includes:
obtaining two paths of echo data、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated by the pulse train of (2) are and />Converted into speed +.> and />；
Same reasonThe available carrier frequency isThe estimated speed of the pulse train of (2) is +.> and />。
In one embodiment of the present invention, the step 3 specifically includes:
for two-way echo data、/>Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, for different carrier frequencies, the speed offset caused by the Doppler frequency offset is different, so that the speeds of false target signals in the two paths of echo data are different; therefore, the true and false targets can be identified by comparing the speeds estimated by the two paths of echo data, the speeds are identical, and the speeds are different.
In one embodiment of the present invention, the step 4 specifically includes:
constructing a speed dimension filter for filtering, and setting the obtained real target movement speed asAfter the motion speed of the true object is obtained, a sine filter is built at the speed dimension and the true object speed>, wherein ,for the whole speed interval, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
According to another aspect of the present invention, there is further provided a speed decoy suppression device based on dual carrier frequency pulses, including a dual carrier frequency transmitting and receiving module, a motion speed calculating module, an interference discriminating and target judging module, and an interference suppression module, wherein:
the dual carrier frequency transmitting and receiving module is used for transmitting carrier frequencies respectively as and />The dual carrier frequency pulse of (2) is to ensure that the dual carrier frequency mixed echo signal is not aliased on the frequency domain, so as to be convenient for separation, two paths of channels are formed after the dual carrier frequency mixed echo signal is received and filtered by the frequency domain, and then down-conversion processing and matched filtering processing are carried out to obtain two paths of echo data +.>And；
the motion speed calculation module is used for utilizing echo data、/>Estimating Doppler frequency of signal in echo by FFT between pulses and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
the interference discrimination and target judgment module is used for comparing two paths of echo data、/>The estimated moving target speed is true target speed, and the speed is inconsistent false target speed;
the interference suppression module is used for setting a speed dimension filter according to the real target speed, filtering the two paths of echo data, and carrying out weighted summation on the filtered data to realize detection of the real target and suppression of the false target.
In one embodiment of the present invention, the dual carrier frequency transmitting and receiving module specifically performs the following operations:
assuming a P-band radar, transmitting two coherent pulse trains with carrier frequencies of 500 MHz and 1000 MHz respectively according to the radar speed measurement principleIt is known that the Doppler frequency of the target is affected by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the dual carrier pulses are different and proportional, and the ratio depends on the ratio of the dual carrier frequencies; but the jammer generates speed spoofing decoy jammers in a manner thatDoppler frequency modulation is carried out on the intercepted radar pulse, and the Doppler frequency used by the modulation mode is always fixed;
assume distanceThere is a speed of +.>Target, no.)>Target echoes received in the pulse repetition period are subjected to matching filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is the target Doppler frequency;
assuming a velocity decoy disturbance, the generation is performed by Doppler modulation of the radar echo of the magnitude ofThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal isThe Doppler guiding vectors of the targets in the double carrier frequencies can be obtained respectively as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8) Let transmit->The pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
In one embodiment of the present invention, the motion speed calculation module specifically performs the following operations:
obtaining two paths of echo data、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated by the pulse train of (2) are and />Converted into speed +.> and />；
The carrier frequency is obtained by the same wayThe estimated speed of the pulse train of (2) is +.> and />。
In one embodiment of the present invention, the interference discrimination and target determination module specifically performs the following operations:
for two-way echo data、/>Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, for different carrier frequencies, the speed offset caused by the Doppler frequency offset is different, so that the speeds of false target signals in the two paths of echo data are different; therefore, the true and false targets can be identified by comparing the speeds estimated by the two paths of echo data, the speeds are identical, and the speeds are different.
In one embodiment of the present invention, the interference suppression module specifically performs the following operations:
constructing a speed dimension filter for filtering, and setting the obtained real target movement speed asAfter the motion speed of the true object is obtained, a sine filter is built at the speed dimension and the true object speed>, wherein />The whole speed interval is represented, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the invention provides a speed false target suppression method based on dual carrier frequency pulses, which comprises the steps of firstly transmitting dual carrier frequency pulses with a certain frequency interval, separating dual carrier frequency pulse mixed echoes in a frequency domain to form two paths of channels through a frequency domain filter after receiving dual carrier frequency mixed echoes, and then performing down-conversion processing and matched filtering processing to obtain two paths of echo data; then, FFT is carried out on the two paths of echo data between pulses to obtain Doppler frequency of signals in the echo, and the Doppler frequency is obtained according toConverting the motion speed into the motion speed; then comparing the speeds of the moving targets estimated by the two paths of echo data respectively to identify true targets and false targets, wherein the speeds are consistent with each other, and the speeds are inconsistent with each other; and finally, setting a speed dimension filter according to the real target speed, filtering the two paths of echo data, and then carrying out weighted summation on the filtered data to realize detection of the real target and suppression of the false target. The algorithm applied by the method is an algorithm which is actually applied at present, the calculated amount is small, the implementation steps are simplified, and the method has good engineering practical value.
Drawings
FIG. 1 is a flow chart of a speed decoy suppression method based on dual carrier pulses in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a speed decoy suppression device based on dual carrier pulses in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the present invention provides a speed false target suppression method based on dual carrier frequency pulse, which includes the following steps:
step 1: the transmitting carrier frequencies are respectively and />The carrier frequency difference is required to be larger than the bandwidth of a radar transmitting signal, so that the double carrier frequency mixed echo signal is ensured not to be aliased on the frequency domain, the double carrier frequency mixed echo signal is convenient to separate, two paths of channels are formed after the double carrier frequency mixed echo signal is received and filtered by the frequency domain, and then the down-conversion processing and the matched filtering processing are carried out to obtain two paths of echo data and />；
Specifically, the two carrier frequencies are transmitted as and />Is based on radar speed measurement principleIt can be known that the Doppler frequency of the target is influenced by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the two paths of echo data are different and proportional, and the proportion depends on the proportion of the dual carrier frequencies; however, the mode of the jammer for generating speed deception false target interference is to carry out Doppler frequency modulation on intercepted radar pulse, and the Doppler frequency used by the modulation mode is always fixed;
assume distanceThere is a speed of +.>Target, no.)>Target echoes received in the pulse repetition period are subjected to matching filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is Doppler frequency;
assuming a velocity decoy disturbance, the generation is performed by Doppler modulation of the radar echo of the magnitude ofThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal isThe Doppler guiding vectors of the targets in the two paths of echo data can be obtained as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8)
hypothetical emissionsThe pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
Step 2: using echo data、/>Obtaining Doppler frequency of echo internal signal by FFT between pulses, and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
specifically, two paths of echo data are obtained、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated for the pulse train of (2) are +.> and />Converted into speed +.> and />；
The carrier frequency is obtained by the same wayThe estimated speed of the pulse train of (2) is +.> and />。
Step 3: comparing two paths of echo data、/>Respectively estimating the speeds of the moving targets, wherein the speeds are consistent as true targets, and the speeds are inconsistent as false targets;
specifically, the motion speeds estimated by the two paths of echo data are compared. For two-way echo data、Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, for different carrier frequencies, the speed offset caused by the Doppler frequency offset is different, so that the speeds of false target signals in the two paths of echo data are different; therefore, the true and false targets can be identified by comparing the speeds estimated by the two paths of echo data, the speeds are identical, and the speeds are different.
Step 4: setting a speed dimension filter according to the real target speed, filtering the two paths of echo data, and then carrying out weighted summation on the filtered data to realize detection of the real target and suppression of the false target;
specifically, a velocity dimension filter is constructed for filtering, and the obtained motion velocity of the true target is set asAfter the motion speed of the true object is obtained, a sine filter is built at the speed dimension and the true object speed>, wherein ,/>The whole speed interval is represented, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
Further, as shown in fig. 2, the present invention further provides a speed false target suppression device based on dual carrier frequency pulse, which includes a dual carrier frequency transmitting and receiving module, a motion speed calculating module, an interference discriminating and target judging module and an interference suppression module, wherein:
the dual carrier frequency transmitting and receiving module is used for transmitting carrier frequencies respectively as and />The carrier frequency difference is required to be larger than the bandwidth of a radar transmitting signal, so that the double carrier frequency mixed echo signal is ensured not to be aliased on the frequency domain, separation is convenient, two paths of channels are formed after the double carrier frequency mixed echo is received and filtered by the frequency domain, and then down-conversion processing and matched filtering processing are carried out to obtain two paths of echo data> and />；
The motion speed calculation module is used for utilizing echo data、/>In the inter-pulse FFT estimation of echoDoppler frequency of the signal and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
the interference discrimination and target judgment module is used for comparing two paths of echo data、/>Respectively estimating the speeds of the moving targets, wherein the speeds are consistent with each other to be true target speeds and the speeds are inconsistent with each other to be false target speeds;
the interference suppression module is used for setting a speed dimension filter according to the real target speed, filtering the two paths of echo data, and carrying out weighted summation on the filtered data to realize detection of the real target and suppression of the false target.
The interference suppression module further specifically performs the following operations:
transmitting two carrier frequencies respectively and />Is based on the radar speed measurement principle +.>It can be known that the Doppler frequency of the target is influenced by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the two paths of echo data are different and proportional, and the proportion depends on the proportion of the carrier frequencies of the two paths of transmission pulse trains; however, the mode of the jammer for generating speed deception false target interference is to carry out Doppler frequency modulation on intercepted radar pulse, and the Doppler frequency used by the modulation mode is always fixed;
assume distanceThere is a speed of +.>Target, no.)>Target echoes received in the pulse repetition period are subjected to matching filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is the target Doppler frequency;
assuming a velocity decoy disturbance, the generation is performed by Doppler modulation of the radar echo of the magnitude ofThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal isThe Doppler guiding vectors of the targets in the two paths of echo data can be obtained as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8)
hypothetical emissionsThe pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
Further, the motion speed calculation module specifically performs the following operations:
obtaining two paths of echo data、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated by the pulse train of (2) are and />Converted into speed +.> and />；
The carrier frequency is obtained by the same wayThe estimated speed of the pulse train of (2) is +.> and />。
Further, the interference discrimination and target judgment module specifically performs the following operations:
for two-way echo data、/>Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, the speed shift caused by the Doppler frequency shift is different for different carrier frequencies, so the two-path echo numberThe speeds of the decoy signals are different; therefore, the true and false targets can be identified by comparing the speeds estimated by the two paths of echo data, the speeds are identical, and the speeds are different.
Further, the interference suppression module specifically performs the following operations:
constructing a speed dimension filter for filtering, and setting the obtained real target movement speed asAfter the movement speed of the real target is obtained, the real target speed is taken in the speed dimension>Constructing a sinc filter>, wherein ,/>The whole speed interval is represented, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The speed false target suppression method based on the dual carrier frequency pulse is characterized by comprising the following steps of:
step 1: the transmitting carrier frequencies are respectively and />Is required to be larger than radarThe bandwidth of the transmitting signal ensures that the double carrier frequency mixed echo signal is not aliased on the frequency domain, is convenient to separate, forms two paths of channels after the double carrier frequency mixed echo signal is received and is filtered by the frequency domain, and then carries out down-conversion processing and matched filtering processing to obtain two paths of echo data->And；
step 2: using echo data、/>Taking FFT between pulses to obtain Doppler frequency of signal in echo, and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
step 3: comparing two paths of echo data、/>Respectively estimating the speeds of the moving targets, wherein the speeds are consistent with each other to be true target speeds and the speeds are inconsistent with each other to be false target speeds;
step 4: and setting a speed dimension filter according to the motion speed of the true target, filtering the two paths of echo data, and then carrying out weighted summation on the filtered data to realize detection of the true target and suppression of the false target.
2. The method for suppressing speed decoy based on dual carrier pulse as claimed in claim 1, wherein said step 1 specifically comprises:
transmitting two carrier frequencies respectively and />Is based on the radar speed measurement principle +.>It can be known that the Doppler frequency of the target is influenced by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the two paths of echo data are different and proportional, and the proportion depends on the proportion of the carrier frequencies of the two paths of transmission pulse trains; however, the mode of the jammer for generating speed deception false target interference is to carry out Doppler frequency modulation on intercepted radar pulse, and the Doppler frequency used by the modulation mode is always fixed;
assume distanceThere is a speed of +.>Target, no.)>Target echoes received in the pulse repetition period are subjected to matching filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is the target Doppler frequency;
assuming a velocity decoy disturbance, the generation is performed by Doppler modulation of the radar echo of the magnitude ofThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal isThe Doppler guiding vectors of the targets in the two paths of echo data can be obtained as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8)
hypothetical emissionsThe pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
3. The method for speed decoy suppression based on dual carrier frequency pulses as claimed in claim 2, wherein said step 2 specifically comprises:
obtaining two paths of echo data、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated for the pulse train of (2) are +.> and />Conversion toThe forming speed is +.> and />；
The carrier frequency is obtained by the same wayThe estimated speed of the pulse train of (2) is +.> and />。
4. The method for suppressing a speed decoy based on dual carrier pulses as set forth in claim 3, wherein said step 3 specifically includes:
for two-way echo data、/>Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, for different carrier frequencies, the speed offset caused by the Doppler frequency offset is different, so that the speeds of false target signals in the two paths of echo data are different; therefore, the estimated speeds of the two paths of echo data can be compared to identify true and false targets,the speed is identical to the true target, and the speeds are different from the false target.
5. The method for suppressing speed decoy based on dual carrier pulse as set forth in claim 4, wherein said step 4 specifically includes:
constructing a speed dimension filter for filtering, and setting the obtained real target movement speed asAfter the motion speed of the true object is obtained, a sine filter is built at the speed dimension and the true object speed>, wherein />The whole speed interval is represented, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
6. The speed false target suppression device based on the dual carrier frequency pulse is characterized by comprising a dual carrier frequency transmitting and receiving module, a motion speed calculating module, an interference identification and target judging module and an interference suppression module, wherein:
the dual carrier frequency transmitting and receiving module is used for transmitting carrier frequencies respectively as and />The carrier frequency difference is required to be larger than the bandwidth of a radar transmitting signal, so that the double carrier frequency mixed echo signal is ensured not to be aliased on the frequency domain, separation is convenient, two paths of channels are formed after the double carrier frequency mixed echo is received and filtered by the frequency domain, and then down-conversion processing and matched filtering processing are carried out to obtain two paths of echo data> and />；
The motion speed calculation module is used for utilizing echo data、/>Estimating Doppler frequency of signal in echo by FFT between pulses and according to +.>Converted into movement speed, wherein->Indicating Doppler frequency, ++>Indicating radar operating wavelength, < >>Indicating the speed of light +.>Indicating radar operating frequency, < >>Representing the speed of movement;
the interference discrimination and target judgment module is used for comparing two paths of echo data、/>Estimated moving object speedWherein the speed is consistent with the true target speed, and the speed is inconsistent with the false target speed;
the interference suppression module is used for setting a speed dimension filter according to the real target speed, filtering the two paths of echo data, and carrying out weighted summation on the filtered data to realize detection of the real target and suppression of the false target.
7. The speed decoy suppression device based on dual carrier pulse as set forth in claim 6, wherein said dual carrier transmitting and receiving module specifically performs the following operations:
transmitting two carrier frequencies respectively and />Is based on the radar speed measurement principle +.>It can be known that the Doppler frequency of the target is influenced by the speed of the target and the carrier frequency of the radar transmission pulse, so that the Doppler frequencies measured by the two paths of echo data are different and proportional, and the proportion depends on the proportion of the carrier frequencies of the two paths of transmission pulse trains; however, the mode of the jammer for generating speed deception false target interference is to carry out Doppler frequency modulation on intercepted radar pulse, and the Doppler frequency used by the modulation mode is always fixed;
assume distanceThere is a speed of +.>Target, no.)>The target echo received by each pulse repetition period is subjected to matched filtering:
(1)
wherein ,is->Amplitude of target echo received in pulse repetition period,/-, and>for transmitting the envelope of the signal>Is pulse repetition period, +.>Is the speed of light;
after down-conversion processing, the echo is:
(2)
wherein ,for radar operating wavelength, < >>Is the target Doppler frequency;
assuming a velocity decoy disturbance, the generation is performed by Doppler modulation of the radar echo of the magnitude ofThe method comprises the following steps:
(3)
similarly, after down-conversion treatment, the echo is:
(4)
in summary, the phase difference existing between the adjacent pulses of the target signal is，
The Doppler guiding vectors of the targets in the two paths of echo data can be obtained respectively as follows:
(5)
(6)
wherein , and />Respectively representing Doppler frequency corresponding to target speed in two paths of echoes,/, respectively>Representing a matrix transposition operation; the doppler vectors of the similarly available interference are respectively:
(7)
(8)
hypothetical emissionsThe pulse and double carrier frequency pulse mixed echo is separated by a frequency domain filter, and then is subjected to down-conversion and matched filtering treatment to obtain two paths of echo data, wherein the two paths of echo data are respectively:
(9)
(10)
wherein ,representing a gaussian white noise matrix.
8. The dual carrier pulse based speed decoy suppression apparatus as claimed in claim 7, wherein said motion speed calculation module performs the following operations:
obtaining two paths of echo data、/>Then, FFT is carried out on the two paths of data between pulses, the Doppler frequency of all signals in the echo can be obtained by taking the peak value of the frequency spectrum, and the carrier frequency is assumed to be +.>Two Doppler frequencies estimated by the pulse train of (2) aref d1 Andf d1 +/>converted into speed +.> and />；
The carrier frequency is obtained by the same wayThe estimated speed of the pulse train of (2) is +.> and />。
9. The dual carrier pulse based speed decoy suppression apparatus according to claim 8, wherein the interference discrimination and target determination module performs the following operations:
for two-way echo data、/>Comparing the estimated movement speed; step 2, obtaining the estimated target speeds of the two echo data respectively, wherein +_>The Doppler frequency modulation of the represented jammer on the signal is realized, and as the double pulses are transmitted simultaneously and modulated by the jammer, the Doppler frequency offset of the interference signal in the two echo data relative to the target signal is fixed; however, for different carrier frequencies, the speed offset caused by the Doppler frequency offset is different, so that the speeds of false target signals in the two paths of echo data are different; therefore, the true and false targets can be identified by comparing the speeds estimated by the two paths of echo data, the speeds are identical, and the speeds are different.
10. The dual carrier pulse based speed decoy suppression apparatus of claim 9, wherein the interference suppression module specifically performs the following operations:
constructing a speed dimension filter for filtering, and setting the obtained real target movement speed asAfter the movement speed of the real target is obtained, the real target speed is taken in the speed dimension>Constructing a sinc filter>, wherein />The whole speed interval is represented, the filter is used for filtering the two paths of echo data, and the weighted summation is carried out on the filtered data, so that the detection of a true target and the inhibition of a false target can be realized.
CN202311089790.0A 2023-08-28 2023-08-28 Speed false target suppression method and device based on dual carrier frequency pulse Active CN116840804B (en)

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