CN114137483A - Adaptive interference suppression method and medium for one-dimensional phase-scanning radar and one-dimensional phase-scanning radar - Google Patents
Adaptive interference suppression method and medium for one-dimensional phase-scanning radar and one-dimensional phase-scanning radar Download PDFInfo
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- CN114137483A CN114137483A CN202111292069.2A CN202111292069A CN114137483A CN 114137483 A CN114137483 A CN 114137483A CN 202111292069 A CN202111292069 A CN 202111292069A CN 114137483 A CN114137483 A CN 114137483A
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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
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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
- 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
- G01S2013/0236—Special technical features
- G01S2013/0245—Radar with phased array antenna
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Abstract
The invention provides a one-dimensional phase-scanning radar self-adaptive interference suppression method, a medium and a one-dimensional phase-scanning radar, wherein the method comprises the following steps: receiving an echo signal; carrying out multi-beam weighting on the echo signals along the pitching direction to obtain space-time two-dimensional data; performing Fourier transform on the space-time two-dimensional data, analyzing frequency spectrum information of the space-time two-dimensional data, and forming a plurality of pitching wave beams on the wave beams in the same direction; comparing the processed wave beam with radar substrate noise; when the amplitude of the detected unit of the multi-beam frequency spectrum is larger than a threshold value, marking the detected unit as an interference signal, and acquiring the number, the strength, the azimuth angle and the pitch angle of the interference signal; constructing a Lagrangian function by the interference signal acquired in the previous period and the set target direction; solving the Lagrange function by adopting a quasi-Newton method to obtain a suppression weight; according to the suppression weight, interference suppression weighting processing is carried out on the radar echo, and the suppression of interference signals can be realized.
Description
Technical Field
The invention belongs to the technical field of radars, and particularly relates to a one-dimensional phase-scanning radar self-adaptive interference suppression method, a medium and a one-dimensional phase-scanning radar.
Background
The phased array radar, namely the phase control electronic scanning array radar, has the capability of quickly and accurately converting beams, so that the radar can complete the scanning of a full airspace within 1 min. The phased array radar is a radar area array composed of a large number of same radiation units, each radiation unit is independently controlled by a wave control and phase shifter in phase and amplitude, and a precise and predictable radiation directional pattern and beam direction can be obtained. When the radar works, the transmitter distributes power to each antenna unit through a feeder network, radiates energy through a large number of independent antenna units and performs power synthesis in space to form needed beam pointing.
The phased array radar has very high power and strong resistance to interference, and the existing interference suppression method mainly comprises two modes of side lobe blanking and side lobe cancellation, but the two modes also have the following defects: the radar is easy to lose effectiveness, and the number of interference suppression is small.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a one-dimensional phase-scanning radar adaptive interference suppression method in a first aspect, which comprises the following steps:
receiving an echo signal;
carrying out multi-beam weighting on the echo signals along the pitching direction to obtain space-time two-dimensional data;
after Fourier transform is carried out on the space-time two-dimensional data, the frequency spectrum information of the space-time two-dimensional data is analyzed, a plurality of pitching wave beams are formed on the wave beams in the same direction, and multi-wave beams are processed;
comparing the processed wave beam with radar substrate noise;
when the amplitude of the detected unit of the multi-beam frequency spectrum is larger than the threshold value, marking the detected unit as an interference signal, and acquiring the number, the strength, the azimuth angle and the pitch angle of the interference signal;
constructing a Lagrangian function by the interference signal acquired in the previous period and the set target direction;
solving the Lagrange function by adopting a quasi-Newton method to obtain a suppression weight;
and carrying out interference suppression weighting processing on the radar echo according to the suppression weight.
As a further improvement of the invention, the processing of multiple beams comprises: and under the condition of keeping the false alarm constant, judging the signal output by the receiver and eliminating the nonexistent target signal.
As a further improvement of the present invention, the step of receiving the wide beam includes the steps of: during a first pulse repetition interval, a target echo signal is received.
As a further improvement of the invention, the step of obtaining the space-time two-dimensional data by performing multi-beam weighting on the echo signal along the pitch direction includes the following steps:
performing A/D conversion on the echo signals;
and weighting the N wave velocities to obtain space-time two-dimensional data pointing to N pitching directions.
As a further improvement of the method, when the Lagrangian function is solved by adopting a quasi-Newton method, a phase-only algorithm is adopted to adjust the precision and the step length.
As a further improvement of the present invention, the lagrangian function is:
wherein λ is the wavelength, αj、βj、λ1Is Lagrangian factor, ul、vlRespectively the real part and imaginary part of the weight of the first array element, theta0For a set target direction, J is the number of interfering signals, θ1、θ2……θJIs the direction of the interfering signal.
In a second aspect of the present invention, a computer-readable storage medium is provided, in which at least one instruction, at least one program, code set, or instruction set is stored, and the at least one instruction, at least one program, code set, or instruction set is loaded and executed by a processor to implement the above-mentioned adaptive interference suppression method.
In a third aspect of the present invention, there is provided a one-dimensional phase-scanning radar, including a processor and a memory, where at least one instruction, at least one program, a code set, or an instruction set is stored in the memory, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the above-mentioned one-dimensional phase-scanning radar adaptive interference suppression method.
Compared with the prior art, the invention has the following beneficial effects: the information of the interference signal is obtained, a Lagrange function is constructed according to the information of the interference signal, the suppression weight is obtained through solving, and the suppression weight acts on the radar echo signal, so that the suppression of the interference signal is realized.
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Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a flowchart of a one-dimensional phase-scanning radar adaptive interference suppression method according to embodiment 1;
fig. 2 is a schematic structural diagram of the one-dimensional phase-scanning radar according to embodiment 1.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
The embodiment discloses a one-dimensional phase-scanning radar adaptive interference suppression method, as shown in fig. 1, including the steps of:
s1, receiving an echo signal; and reserving a pulse repetition interval in the beam width of each azimuth, performing cooperative processing on the received signals by the radar under the synchronization of the synchronous pulses, and receiving a wide beam by the radar in a target pitching wide range in the first pulse repetition interval.
And S2, carrying out multi-beam weighting on the echo signals along the pitching direction to obtain space-time two-dimensional data.
Step S2 specifically includes the following steps:
and S21, synchronously sampling the echo signals by each row antenna, and performing A/D conversion on the echo signals received by each L array element to obtain L multiplied by M dimension echo signals.
And S22, weighting the L multiplied by M dimensional echo signals by N wave speeds to obtain M multiplied by N space-time two-dimensional data pointing to N pitching directions.
And S3, after Fourier transform is carried out on the space-time two-dimensional data, the frequency spectrum information of the space-time two-dimensional data is analyzed, a plurality of pitching wave beams are formed on the wave beams in the same direction, and the multi-wave beams are processed.
Specifically, processing multiple beams includes: under the condition of keeping the false alarm constant, the signals output by the receiver are judged, and nonexistent target signals are eliminated.
And S4, comparing the processed wave beam with the radar substrate noise.
And S5, when the amplitude of the detected unit of the multi-beam frequency spectrum is larger than the threshold, marking the detected unit as an interference signal, acquiring the number, the strength, the azimuth angle and the pitch angle of the interference signal, and solving the suppression weight by using the information of the interference signal as the constraint condition of the phase-only algorithm. The threshold may be an interference identification threshold.
S6, constructing a Lagrangian function according to the interference signals acquired in the previous period and the set target direction:
wherein λ is the wavelength, αj、βj、λ1Is the Lagrangian factor u1、v1Respectively the real part and the imaginary part of the weight of the first array element, theta0For a set target direction, J is the number of interfering signals, θ1、θ2……θJIs the direction of the interfering signal.
And S7, solving the Lagrangian function by adopting a quasi-Newton method to obtain a suppression weight. And adjusting the precision and the step length by adopting a phase-only algorithm.
Specifically, firstly, the complex weighting coefficient u of each array element is obtained by solving1+jv1Then according to the formula
And (5) obtaining the final suppression weight.
S8, according to the suppression weight, carrying out interference suppression weighting processing on the radar echo, namely, the radar antenna continuously rotates to continuously detect the interference signal, and the signal processing module of the radar searches the corresponding suppression weight through the prestored azimuth angle information and carries out multi-beam weighting, thereby realizing the suppression of the interference signal.
In the embodiment, the information of the interference signal is obtained, the lagrangian function is constructed according to the information of the interference signal, the suppression weight is obtained through solving, and the suppression weight acts on the radar echo signal, so that the suppression of the interference signal is realized.
Example 2
The present embodiment provides a computer-readable storage medium, in which at least one instruction, at least one program, a code set, or a set of instructions is stored, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by a processor to implement the one-dimensional phase-scanning radar adaptive interference suppression method according to embodiment 1.
Optionally, the computer-readable storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a Solid State Drive (SSD), or an optical disc. The Random Access Memory may include a resistive Random Access Memory (ReRAM) and a Dynamic Random Access Memory (DRAM).
Example 3
The embodiment provides a one-dimensional phase-scanning radar, as shown in fig. 2, which includes a processor and a storage, wherein the storage stores program codes, and the processor executes the program codes to perform the adaptive interference suppression method of embodiment 1.
Those skilled in the art will recognize that the functionality described in the embodiments of the present application, in one or more of the examples described above, may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (8)
1. A one-dimensional phase-scanning radar self-adaptive interference suppression method is characterized by comprising the following steps:
receiving an echo signal;
carrying out multi-beam weighting on the echo signals along the pitching direction to obtain space-time two-dimensional data;
after Fourier transform is carried out on the space-time two-dimensional data, the frequency spectrum information of the space-time two-dimensional data is analyzed, a plurality of pitching wave beams are formed on the wave beams in the same direction, and multi-wave beams are processed;
comparing the processed wave beam with radar substrate noise;
when the amplitude of the detected unit of the multi-beam frequency spectrum is larger than a threshold value, marking the detected unit as an interference signal, and acquiring the number, the strength, the azimuth angle and the pitch angle of the interference signal;
constructing a Lagrangian function by the interference signal acquired in the previous period and the set target direction;
solving the Lagrange function by adopting a quasi-Newton method to obtain a suppression weight;
and carrying out interference suppression weighting processing on the radar echo according to the suppression weight.
2. The adaptive interference suppression method according to claim 1, wherein processing multiple beams comprises: and under the condition of keeping the false alarm constant, judging the signal output by the receiver and eliminating the nonexistent target signal.
3. The adaptive interference suppression method according to claim 1, wherein the step of performing wide beam reception comprises the steps of: during a first pulse repetition interval, a target echo signal is received.
4. The adaptive interference suppression method according to claim 1, wherein the step of obtaining space-time two-dimensional data by performing multi-beam weighting on the echo signals in the pitch direction comprises the steps of:
performing A/D conversion on the echo signals;
and weighting the N wave velocities to obtain space-time two-dimensional data pointing to N pitching directions.
5. The adaptive interference suppression method according to claim 1, wherein when solving the lagrangian function using a quasi-newton method, a phase-only algorithm is used to adjust the precision and step size.
6. The adaptive interference suppression method according to claim 1, characterized by a lagrangian function of:
wherein λ is the wavelength, αj、βj、λ1Is Lagrangian factor, u1、v1Respectively the real part and the imaginary part of the weight of the first array element, theta0For a set target direction, J is the number of interfering signals, θ1、θ2……θJIs the direction of the interfering signal.
7. A computer readable storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement the adaptive interference suppression method according to any one of claims 1 to 6.
8. A one-dimensional phase scanning radar comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, at least one program, set of codes, or set of instructions being loaded and executed by the processor to implement the one-dimensional phase scanning radar adaptive interference suppression method according to any one of claims 1 to 7.
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| US20170102458A1 (en) * | 2014-06-09 | 2017-04-13 | Src, Inc. | Multiplatform GMTI Radar With Adaptive Clutter Suppression |
| CN104678368A (en) * | 2015-02-16 | 2015-06-03 | 零八一电子集团有限公司 | Self-adapting space interference suppression method of one-dimensional phase scanning three-coordinate radar |
| CN107831480A (en) * | 2017-10-13 | 2018-03-23 | 西安电子科技大学 | Missile-borne radar and the sane self-adapting clutter suppressing method of poor passage |
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