CN116449313B - Main lobe suppression noise interference resisting method and device for radar based on intra-pulse multi-carrier frequency signals - Google Patents
Main lobe suppression noise interference resisting method and device for radar based on intra-pulse multi-carrier frequency signals Download PDFInfo
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- 230000001629 suppression Effects 0.000 title claims abstract description 23
- 238000001228 spectrum Methods 0.000 claims abstract description 30
- 230000001427 coherent effect Effects 0.000 claims abstract description 10
- 238000009825 accumulation Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 8
- 239000000284 extract Substances 0.000 claims abstract description 7
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a radar main lobe suppression noise interference resisting method based on intra-pulse multi-carrier frequency signals, which comprises the following steps of: the radar transmits multi-carrier frequency signals in the pulse and receives radar echo signals; wherein the intra-pulse multi-carrier frequency signal consists ofThe LFM signals with non-overlapping frequencies are formed; step 2: performing frequency domain filtering processing on the radar echo signals, and utilizingThe orthogonality of the frequencies of the signals extracts LFM signals with different frequencies; step 3: performing spectrum analysis on LFM signals with different frequencies in the step 2 by adopting short-time Fourier transform to obtain a time-frequency spectrogram of the LFM signals; step 4: detecting the time-frequency spectrogram in the step 3, removing signals with the time-frequency spectrogram showing noise characteristics, and reserving signals with the time-frequency spectrum showing oblique lines; step 5: and (3) constructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to the signals with the oblique frequency spectrums in the step (4), and carrying out carrier frequency domain coherent accumulation processing on the signals with the oblique frequency spectrums in the step (4).
Description
Technical Field
The invention belongs to the technical field of signal processing, and particularly relates to a radar main lobe suppression noise interference resisting method and device based on intra-pulse multi-carrier frequency signals.
Background
In recent years, radars have made remarkable progress in side lobe interference suppression, however, with the rapid development of technologies such as electronic warplanes and unmanned aerial vehicle clusters in various countries, main lobe interference scenes such as self-defense interference, satellite interference and 'three-point one-line' long-distance support interference faced by radars are more complex. Compared with sidelobe interference, the main lobe interference can obtain larger radar main lobe gain, and the interference utilization rate is higher; under the condition of main lobe interference, the main lobe of a radar beam is distorted by adopting technologies such as space domain side lobe cancellation or self-adaptive beam forming, and the target gain is reduced, so that the target detection is seriously influenced; the main lobe interference signal and the target echo cannot be completely separated in the time-frequency domain. Therefore, the traditional anti-interference method will be seriously invalid in the main lobe interference scene.
Noise interference can achieve masking and suppression effects on target echoes by generating signals with randomly varying amplitudes and phases. Under the background of a traditional phased array radar, main lobe suppression noise interference cannot be distinguished from a target echo signal in space, time (Doppler), frequency and energy domains, so that an effective method for suppressing the main lobe suppression noise interference is not available. When the radar adopts the transmission mode of the intra-pulse multi-carrier frequency signals, the frequency distribution range of the intra-pulse multi-carrier frequency signals is wider, the noise interference bandwidth is usually limited, the interference signals cannot completely cover all frequency points of the multi-carrier frequency signals, signals with certain frequencies are not interfered necessarily, and at the moment, the undisturbed signals can be used for target detection. Meanwhile, the undisturbed signals are accumulated through the coherent processing of the carrier frequency domain, and the target power loss caused by multiple carrier frequencies can be avoided.
Therefore, the invention is urgently needed to invent a main lobe suppression noise interference resisting method based on the intra-pulse multi-carrier frequency signal so as to realize suppression of main lobe suppression noise interference and improve target detection performance of the radar.
Disclosure of Invention
Therefore, the invention provides a radar main lobe suppression noise interference resisting method based on intra-pulse multi-carrier frequency signals, 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 main lobe suppression noise interference resisting method for a radar based on an intra-pulse multi-carrier signal, comprising the steps of:
step 1: the radar transmits multi-carrier frequency signals in the pulse and receives radar echo signals; wherein the intra-pulse multi-carrier frequency signal consists ofThe LFM signals with non-overlapping frequencies are formed;
step 2: for the radarEcho signals are subjected to frequency domain filtering processing, and the echo signals are utilizedThe orthogonality of the frequencies of the signals extracts LFM signals with different frequencies;
step 3: performing spectrum analysis on LFM signals with different frequencies in the step 2 by adopting short-time Fourier transform to obtain a time-frequency spectrogram of the LFM signals;
step 4: detecting the time-frequency spectrogram in the step 3, removing signals with the time-frequency spectrogram showing noise characteristics, and reserving signals with the time-frequency spectrum showing oblique lines;
step 5: constructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to the signals with the oblique frequency spectrums in the step 4, and carrying out carrier frequency domain coherent accumulation processing on the signals with the oblique frequency spectrums in the step 4;
wherein the intra-pulse multi-carrier frequency signal is set asSuperposition of frequency step signals, < >>The frequency step between the individual signals is +.>I.e. +.>, wherein />For the initial signal carrier frequency, ">，/>For the bandwidth of a single LFM signal, the formula represents +.>The carrier frequency of the individual signals is increased by +.>。
Further, the radar-transmitted intra-pulse multi-carrier signal in the step 1 is expressed as
(1)
wherein Is the baseband waveform of the LFM signal, +.>Is the pulse width of the LFM signal;
for a distance ofIs represented as a received radar echo signal
(2)
wherein For the complex amplitude of the target echo +.>For propagation delay of multi-carrier signals, +.>Is the speed of light;
as can be seen from the expression,the frequency stepping signals arrive at the target at the same time, namely the phase difference between the signal echoes is irrelevant to the angle and the speed of the target, namely the intra-pulse multi-carrier frequency system realizes the three-dimensional decoupling of distance, angle and speed. For the convenience of analysis, the invention is illustrated by taking multi-carrier frequency signals received by single pulses of single array elements as an example.
Further, the methodIn the step 2, the radar echo signal is subjected to frequency domain filtering, a first stepThe frequency response function of the ideal filter is
(3)
By means ofThe orthogonality of the frequencies of the signals extracts LFM signals of different frequencies to be expressed as
(4)
Further, in the step 3, the LFM signals with different frequencies in the step 2 are subjected to spectrum analysis by using short-time fourier transform, so as to obtain a time-frequency spectrum diagram with the following characteristics
(5)
wherein ,is a hamming window function.
Further, in the step 4, the time-frequency spectrum chart in the step 3 is detected, if the time-frequency spectrum of the signal is oblique, the signal is not interfered, and the signal is reserved; if the frequency spectrum of the signal fluctuates randomly, the signal is interfered by noise signals, the signal is removed, and the reserved LFM signal number is set asRearranging these signals as。
Further, in the step 5, the distance of the target is set to beConstructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to signals with oblique frequency spectrums in the step 4
(6)
wherein Carrying out carrier frequency domain coherent accumulation processing on the signals with the frequency spectrums being oblique lines in the step 4 as target carrier frequency domain frequencies
(7)。
Further, the intra-pulse multi-carrier frequency signal in the step 1 comprises intra-pulse simultaneous multi-carrier frequency or intra-pulse continuous multi-carrier frequency; the single signal pattern in the intra-pulse multi-carrier frequency signal in the step 1 comprises: LFM signal, non-chirped signal, or phase encoded signal.
Further, the radar platform comprises a foundation, an empty foundation and a space foundation.
According to another aspect of the present invention, there is provided an intra-pulse multi-carrier frequency signal-based radar main lobe suppression noise interference device, including at least one processor and a memory, where the at least one processor and the memory are connected by a data bus, and the memory stores instructions executed by the at least one processor, where the instructions, after being executed by the processor, are configured to complete the intra-pulse multi-carrier frequency signal-based radar main lobe suppression noise interference method.
Compared with the prior art, the method has the beneficial effects that the method for resisting main lobe suppression noise interference based on the intra-pulse multi-carrier frequency signal radar is provided, and firstly, intra-pulse multi-carrier frequency radar transmitting signals with a plurality of different frequencies are constructed; secondly, carrying out frequency domain filtering processing on the multi-carrier frequency echo signals, and extracting each LFM signal echo; performing spectrum analysis on each LFM signal by adopting STFT; then removing LFM signals corresponding to the noise time-frequency spectrogram; and finally, carrying out carrier frequency domain coherent processing on the rest multi-carrier frequency signals, and extracting target information.
Further, the invention can realize the minimization of the interference power received by the radar by resisting the main lobe suppression noise interference of the multi-carrier frequency signals in the pulse;
furthermore, the invention can perform coherent accumulation on the undisturbed echo signals by transmitting the multi-carrier frequency signals in the pulse, thereby reducing the power loss of the target in the echo signals.
Drawings
FIG. 1 (a) is a signal form of an intra-pulse multi-carrier signal; FIG. 1 (b) is a time-frequency spectrum diagram of an intra-pulse multi-carrier signal;
FIG. 2 is a time-frequency spectrum diagram of each signal in a single pulse echo according to the present invention;
fig. 3 is a flow chart of a method for resisting main lobe suppression noise interference based on an intra-pulse multi-carrier frequency signal radar according to the 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.
Referring to fig. 1 (a), the intra-pulse multi-carrier frequency signal provided by the present invention superimposes P LFM signals in each pulse, the frequency spectrum of the intra-pulse multi-carrier frequency signal provided by the present invention is shown in fig. 1 (b), the frequency bands of the P signals do not overlap each other, the time-frequency spectrum of the radar echo provided by the present invention is shown in fig. 2, wherein the signal 1-2 is interfered by noise, the time-frequency spectrum thereof shows noise characteristics, the signal 3-P is not interfered, and the signal time-frequency spectrum thereof shows oblique line distribution; the radar main lobe interference resisting method based on the intra-pulse multi-carrier frequency signal provided by the invention is shown in figure 3, and comprises the following steps:
step 1: the radar transmits multi-carrier frequency signals in the pulse and receives radar echo signals; wherein said at least one ofThe multi-carrier frequency signal in the pulse is composed ofThe LFM signals with non-overlapping frequencies are formed;
setting the intra-pulse multi-carrier frequency signal asSuperposition of frequency step signals, < >>The frequency step between the individual signals is +.>I.e. +.>, wherein />For the initial signal carrier frequency, ">，/>For the bandwidth of a single LFM signal, the formula represents +.>The carrier frequency of the individual signals is increased by +.>；
The radar-transmitted intra-pulse multi-carrier frequency signal in the step 1 is expressed as
(1)
wherein Is the baseband waveform of the LFM signal, +.>Is the pulse width of the LFM signal;
for a distance ofIs represented as a received radar echo signal
(2)
wherein For the complex amplitude of the target echo +.>For propagation delay of multi-carrier signals, +.>Is the speed of light;
as can be seen from the expression,the frequency stepping signals arrive at the target at the same time, namely the phase difference between the signal echoes is irrelevant to the angle and the speed of the target, namely the intra-pulse multi-carrier frequency system realizes the three-dimensional decoupling of distance, angle and speed. For the convenience of analysis, the invention is illustrated by taking multi-carrier frequency signals received by single pulses of single array elements as an example.
Step 2: performing frequency domain filtering processing on the radar echo signals, and utilizingThe orthogonality of the frequencies of the signals extracts LFM signals with different frequencies;
specifically, the radar echo signal is subjected to frequency domain filtering processing, and the firstThe frequency response function of the ideal filter is
(3)
By means ofThe orthogonality of the frequencies of the signals extracts LFM signals of different frequencies to be expressed as
(4)
Step 3: performing spectrum analysis on LFM signals with different frequencies in the step 2 by adopting short-time Fourier transform to obtain a time-frequency spectrogram of the LFM signals;
specifically, the LFM signals with different frequencies in the step 2 are subjected to spectrum analysis by adopting short-time Fourier transform, so that a time-frequency spectrogram is obtained
(5)
wherein ,is a hamming window function.
Step 4: detecting the time-frequency spectrogram in the step 3, eliminating the signal with the time-frequency spectrogram showing noise characteristic, reserving the signal with the time-frequency spectrum showing oblique lines, and setting the reserved LFM signal number asRearranging these signals as。
Step 5: constructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to the signals with the oblique frequency spectrums in the step 4, and carrying out carrier frequency domain coherent accumulation processing on the signals with the oblique frequency spectrums in the step 4;
specifically, the distance of the target is set asConstructing a carrier according to carrier frequencies corresponding to signals with oblique frequency spectrums in the step 4Frequency domain static weight vector
(6)
wherein Carrying out carrier frequency domain coherent accumulation processing on the signals with the frequency spectrums being oblique lines in the step 4 as target carrier frequency domain frequencies
(7)
Further, the intra-pulse multi-carrier frequency signal in the step 1 includes, but is not limited to, intra-pulse simultaneous multi-carrier frequency, intra-pulse continuous multi-carrier frequency, and the like; the single signal types in the multi-carrier frequency signals in the step 1 include, but are not limited to, LFM signals, nonlinear frequency modulation signals, phase coding signals, etc.; radar platforms to which the present invention is applicable include, but are not limited to, radar for ground, space, and the like platforms.
The invention further provides a radar main lobe suppression noise interference resisting device based on the intra-pulse multi-carrier frequency signals, which comprises at least one processor and a memory, wherein the at least one processor and the memory are connected through a data bus, the memory stores instructions executed by the at least one processor, and the instructions are used for completing the radar main lobe suppression noise interference resisting method based on the intra-pulse multi-carrier frequency signals after being executed by the processor.
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 (9)
1. A radar noise suppression interference method based on intra-pulse multi-carrier frequency signals is characterized by comprising the following steps:
step 1: radar transmitting intra-pulse overloadA frequency signal and a radar echo signal are received; wherein the intra-pulse multi-carrier frequency signal consists ofThe LFM signals with non-overlapping frequencies are formed;
step 2: performing frequency domain filtering processing on the radar echo signals, and utilizingThe orthogonality of the frequencies of the signals extracts LFM signals with different frequencies;
step 3: performing spectrum analysis on LFM signals with different frequencies in the step 2 by adopting short-time Fourier transform to obtain a time-frequency spectrogram of the LFM signals;
step 4: detecting the time-frequency spectrogram in the step 3, removing signals with the time-frequency spectrogram showing noise characteristics, and reserving signals with the time-frequency spectrum showing oblique lines;
step 5: constructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to the signals with the oblique frequency spectrums in the step 4, and carrying out carrier frequency domain coherent accumulation processing on the signals with the oblique frequency spectrums in the step 4;
wherein the intra-pulse multi-carrier frequency signal is set asSuperposition of frequency step signals, < >>The frequency step between the individual signals is +.>I.e. +.>, wherein />For the initial signal carrier frequency, ">，/>For the bandwidth of a single LFM signal, the formula represents +.>The carrier frequency of the individual signals is increased by +.>。
2. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 1, wherein said radar transmitting intra-pulse multi-carrier frequency signal in step 1 is expressed as
(1)
wherein Is the baseband waveform of the LFM signal, +.>Is the pulse width of the LFM signal;
for a distance ofIs represented as a received radar echo signal
，/>(2)
wherein For the complex amplitude of the target echo +.>For propagation delay of multi-carrier signals, +.>Is the speed of light;
as can be seen from the expression,the frequency stepping signals arrive at the target at the same time, namely the phase difference between the signal echoes is irrelevant to the angle and the speed of the target, namely the intra-pulse multi-carrier frequency system realizes the three-dimensional decoupling of distance, angle and speed.
3. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 2, wherein in said step 2, the radar echo signal is subjected to a frequency domain filtering process, the firstThe frequency response function of the ideal filter is
(3)
By means ofThe orthogonality of the frequencies of the signals extracts LFM signals of different frequencies to be expressed as
(4)。
4. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 3, wherein in said step 3, the LFM signals of different frequencies in step 2 are subjected to spectrum analysis by using short-time fourier transform to obtain a time-frequency spectrum diagram with the following characteristics
(5)
wherein ,is a hamming window function.
5. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 4, wherein in said step 4, the time-frequency spectrogram of step 3 is detected, the signal whose time-frequency spectrogram shows noise characteristics is removed, the signal whose time-frequency spectrum shows oblique lines is reserved, the reserved LFM signal number is set asRearranging these signals to +.>。
6. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 5, wherein in said step 5, the distance of the target is set to beConstructing a carrier frequency domain static weight vector according to carrier frequencies corresponding to signals with oblique frequency spectrums in the step 4
(6)
wherein Carrying out carrier frequency domain coherent accumulation processing on the signals with the frequency spectrums being oblique lines in the step 4 as target carrier frequency domain frequencies
(7)。
7. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 1 or 2, wherein the intra-pulse multi-carrier frequency signal in step 1 includes intra-pulse simultaneous multi-carrier frequency or intra-pulse continuous multi-carrier frequency; the single signal pattern in the intra-pulse multi-carrier frequency signal in the step 1 comprises: LFM signal, non-chirped signal, or phase encoded signal.
8. The method for resisting main lobe suppressed noise interference based on intra-pulse multi-carrier frequency signal radar according to claim 1 or 2, wherein the radar platform comprises a foundation, an empty foundation and a space foundation.
9. A radar noise suppression interference device based on intra-pulse multi-carrier frequency signals is characterized in that:
comprising at least one processor and a memory connected by a data bus, the memory storing instructions for execution by the at least one processor, the instructions, when executed by the processor, for performing the intra-pulse multi-carrier frequency signal-based radar main lobe suppression noise interference method of any one of claims 1-8.
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