CN117129948A - Method for side lobe concealment based on unbalanced receiving system - Google Patents

Method for side lobe concealment based on unbalanced receiving system Download PDF

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Publication number
CN117129948A
CN117129948A CN202311097204.7A CN202311097204A CN117129948A CN 117129948 A CN117129948 A CN 117129948A CN 202311097204 A CN202311097204 A CN 202311097204A CN 117129948 A CN117129948 A CN 117129948A
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CN
China
Prior art keywords
signal
main lobe
lobe
channel
gain
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Pending
Application number
CN202311097204.7A
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Chinese (zh)
Inventor
焦美敬
唐琳
高林星
张瑞捷
吴雪微
李盘虎
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Shanghai Radio Equipment Research Institute
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Shanghai Radio Equipment Research Institute
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Application filed by Shanghai Radio Equipment Research Institute filed Critical Shanghai Radio Equipment Research Institute
Priority to CN202311097204.7A priority Critical patent/CN117129948A/en
Publication of CN117129948A publication Critical patent/CN117129948A/en
Pending legal-status Critical Current

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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
    • G01S7/28—Details of pulse systems
    • G01S7/2813—Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays
    • 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

Abstract

The invention discloses a method for carrying out side lobe concealment based on an unbalanced receiving system, which comprises the following steps: s1, constructing a radar test system; s2, calculating a signal-to-noise ratio A of a main lobe signal and a protection channel signal of a signal processing end; s3, calculating a sidelobe shadow judgment threshold T r Is defined by the range of (2); s4, according to the signal-to-noise ratio A of the main lobe signal and the protection channel signal of the signal processing end in the step S2 and the sidelobe concealment judgment threshold T in the step S3 r Performing side lobe hiding threshold judgment; the invention uses the low gain protection channel of the antenna to realize the side lobe shadow, greatly reduces the hardware implementation difficulty of the side lobe shadow, uses the signal to noise ratio to judge, has smaller influence by environment and has wider application range.

Description

Method for side lobe concealment based on unbalanced receiving system
Technical Field
The invention relates to the field of radar detection, in particular to a method suitable for side lobe concealment of an unbalanced receiving system.
Background
The main beam width of the antenna occupies a very small portion of its pattern and more spatial energy is received into the system from the antenna side lobes. Clutter interference in the presence of side lobes can seriously affect the accuracy of the measurement of the target angle. The removal or attenuation of sidelobe interference is an important task for radar target detection.
With the development of signal processing technology, many methods for reducing the side lobe influence have been proposed. However, the conventional sidelobe concealment method has higher requirement on the gain of the auxiliary antenna, and the gain of the sidelobe of the main antenna needs to be slightly larger than that of the main antenna but is far smaller than that of the main antenna. When the side lobe gain is larger, the design difficulty of the auxiliary antenna with proper size and gain is larger. Therefore, the sidelobe concealment method which has no strict requirement on the gain of the auxiliary antenna, small calculated amount and realizable engineering is provided, and has important significance for accurately detecting the target of the radar system.
Disclosure of Invention
The invention aims to provide a sidelobe concealment method which has no strict requirement on the gain of an auxiliary antenna, is small in calculated amount and can be realized by engineering.
In order to achieve the above object, the present invention provides a method for side lobe concealment based on an unbalanced receiving system, comprising the following steps:
s1, constructing a radar test system;
s2, calculating a signal-to-noise ratio A of a main lobe signal and a protection channel signal of a signal processing end;
s3, calculating a sidelobe shadow judgment threshold T r Is defined by the range of (2);
s4, according to the signal-to-noise ratio A of the main lobe signal and the protection channel signal of the signal processing end in the step S2 and the sidelobe concealment judgment threshold T in the step S3 r And (3) carrying out side lobe concealment threshold judgment.
The step S1 specifically includes: in a darkroom capable of receiving and transmitting microwave signals, an antenna with a protection channel is arranged on a turntable, the rear end of the antenna is connected with a radar signal processor, and the antenna is connected with a radar system.
Wherein, the ratio of signal to noise ratio of the main lobe signal and the protection channel signal of the signal processing endWherein G is m For the receiving gain of the main lobe channel of the array plane, < + >>To protect the noise amplitude of the channel for the array plane, G p Receive gain for the plane protection channel, +.>Is the noise amplitude of the main lobe channel of the array surface.
Wherein, the ratio A=of the signal to noise ratio of the main lobe signal and the protection channel signal at the signal processing end
Wherein,is echo signal V 0 Radio frequency signal amplitude after array plane main lobe channel gain amplification, image frequency rejection mixer mixing, filtering amplification and automatic gain control>Noise amplitude of main lobe channel of signal processing end, < >>Is echo signal V 0 Radio frequency signal amplitude after array plane protection channel gain amplification, image frequency rejection mixer mixing, filtering amplification and automatic gain control>Protecting the noise amplitude of the channel for the signal processing end, G AGC For the link gain from the array plane to the signal processing end, < >>Is echo signal V 0 Radio frequency signal amplitude amplified by gain of array plane main lobe channel +.>Is echo signal V 0 The amplitude of the radio frequency signal is amplified by the gain of the array protection channel.
Wherein, the sidelobe hiding judgment threshold T r In the range T rl <T r <T rh ， Wherein G is sn Receiving gain of nth sidelobe of main lobe of array surface, G s1 And receiving gain of a first side lobe of the array main lobe.
If the ratio A of the signal to noise ratio of the main lobe signal and the protection channel signal at the signal processing end in step S2>T rh Judging that the main lobe is intercepted; if the signal-to-noise ratio A of the main lobe signal and the protection channel signal at the signal processing end in step S2<T rl And judging that the side lobe is intercepted.
And for each frame of signal, calculating the signal-to-noise ratio A of the main lobe signal and the protection channel signal at the signal processing end in sequence, and performing sidelobe concealment threshold judgment.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention uses the low gain protection channel of the antenna to realize the side lobe shadow, thereby greatly reducing the hardware implementation difficulty of the side lobe shadow; the method has low complexity of the processing process, small overall calculation amount, saving of information processor resources and easy realization; according to the method, the transmitting state of each TR channel can be rapidly judged according to the energy of echo signals of the main lobe channel and the protection channel, and the real-time performance is high; the method uses the ratio of the signal to the noise to make the judgment, has smaller influence by the environment and has wider application range.
Drawings
FIG. 1 is a flow chart of a method for side lobe concealment based on an unbalanced receiving system according to the present invention;
FIG. 2 is a schematic diagram of antenna channel gains for an unbalanced reception system;
fig. 3 is a schematic diagram of a sidelobe concealment test system for an unbalanced reception system.
Detailed Description
The technical scheme, constructional features, achieved objects and effects of the embodiments of the present invention will be described in detail below with reference to fig. 1 to 3 in the embodiments of the present invention.
It should be noted that, the drawings are in very simplified form and all use non-precise proportions, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any modification of structure, change of proportion or adjustment of size, without affecting the efficacy and achievement of the present invention, should still fall within the scope covered by the technical content disclosed by the present invention.
It is noted that in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
A method for side lobe concealment based on an unbalanced receiving system, as shown in fig. 1, comprising the following steps:
s1, constructing a radar test system;
as shown in fig. 3, an antenna with a protection channel is mounted on a turntable in a darkroom capable of receiving and transmitting microwave signals, and the rear end of the antenna is connected with a radar signal processor and connected with a radar system.
S2, calculating a signal-to-noise ratio A of a main lobe signal and a protection channel signal of a signal processing end for each frame signal;
the protection channel is a passive channel on an antenna, as shown in fig. 2, the gain has no special requirement, the special requirement that the gain is slightly larger than the gain of a main antenna sidelobe and is far smaller than the gain of a main lobe is not required, and the gain of the protection channel can be smaller than the gain of the sidelobe of an array part, but the gain of the protection channel does not meet the gain requirement of a conventional sidelobe hiding method, and the main lobe and the auxiliary lobe cannot be identified directly through amplitude values of the main lobe and the protection channel, so that the signal-to-noise ratio A of a main lobe signal and a protection channel signal at a signal processing end is calculated for identification.
Receiving antenna echo signal V at antenna main lobe 0 When the protection channel synchronously receives the echo signal V 0 Echo signal V received by the antenna main lobe and the protection channel 0 The echo signal V enters a signal processing end through the frequency mixing, the filtering amplification and the automatic gain control of different array surface channel amplification, the image rejection mixer 0 The amplitude of the radio frequency signal amplified by the gain of the main lobe channel of the array surface isEcho signal V 0 The amplitude of the radio frequency signal amplified by the gain of the array plane protection channel is +.>And->After the frequency mixing, the filtering amplification and the automatic gain control of the image rejection mixer, the amplitude of the radio frequency signal becomes +.>And->Entering the signal processing end.
In particular, the method comprises the steps of,G m g is the receiving gain of the main lobe channel of the array surface p Receive gain for the plane protection channel, +.>G AGC The ratio A of the signal to noise ratio of the main lobe signal and the protection channel signal of the signal processing end is as follows:
wherein,noise amplitude of main lobe channel of signal processing end, < >>Noise amplitude for the front main lobe channel, +.>Protecting the noise amplitude of the channel for the signal processing side, < >> The noise amplitude of the channel is protected for the array plane.
Taking a specific embodiment as an example, after the image rejection mixer mixes, filters and amplifies and automatic gain controlThe intermediate frequency signal amplitude of the main lobe and the protection channel are respectivelyAnd->The noise amplitudes are respectivelyAnd->Thus, the signal-to-noise ratio A= 25.5484 of the main lobe signal and the protection channel signal of the signal processing end is calculated.
S3, calculating a sidelobe shadow judgment threshold T r Is defined by the range of (2);
in order to remove clutter interference existing in side lobes, calculating theoretical maximum value T of signal to noise ratio of main lobe signal and protection channel signal at signal processing end rh And theoretical minimum value T rl ：
Thereby T is provided with rl <T r <T rh Wherein G is sn Receiving gain of nth sidelobe of main lobe of array surface, G s1 And receiving gain of a first side lobe of the array main lobe.
The theoretical maximum value T rh And theoretical minimum value T rl The calculation logic of (1) is:
from the following componentsAvailable (I)>Thereby->
In a specific embodiment, the receiving gain G of the main lobe channel of the array plane m Reception gain G of first side lobe of main lobe of array surface s1 Reception gain G of n-th sidelobe of main lobe of array plane of 12db sm Noise amplitude of the front main lobe channel of the array =8dbNoise amplitude of array protection channel>Thereby calculating and obtaining the theoretical maximum value T of the signal to noise ratio of the main lobe signal and the protection channel signal of the signal processing end rh And theoretical minimum value T rl The method comprises the following steps of: t (T) rh ＝17.9448，T rl = 7.144, thereby obtaining a sidelobe concealment decision threshold T r Is in the range of 7.144<T r <17.9448。
S4, according to the signal-to-noise ratio A of the main lobe signal and the protection channel signal of the signal processing end in the step S2 and the sidelobe concealment judgment threshold T in the step S3 r For each frame of signal, carrying out side lobe hiding threshold judgment;
with side lobe concealment decision threshold T r For reference, if the ratio A of the signal to noise ratio of the main lobe signal and the protection channel signal at the signal processing end in step S2>T rh The target signal is the main lobe direction, the main lobe interception is judged, and the subsequent searching and tracking processing is executed; if the signal-to-noise ratio A of the main lobe signal and the protection channel signal at the signal processing end in step S2<T rl And if the target signal is in the side lobe direction, judging that the target signal is in the side lobe interception mode, and no subsequent signal processing operation is executed, so that side lobe shadow is realized.
In this embodiment, the main lobe signal and protection of the signal processing end are calculatedThe signal-to-noise ratio A= 25.5484 of the channel signal is larger than the sidelobe concealment judgment threshold T r Therefore, the target signal is in the main lobe direction, the main lobe interception is judged, and the subsequent search and tracking processing is executed.
And for each frame of signal, calculating the signal-to-noise ratio A of the main lobe signal and the protection channel signal at the signal processing end in sequence, and carrying out sidelobe concealment threshold judgment.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims (7)

1. A method for side lobe concealment based on an unbalanced receiving system, comprising the steps of:
s1, constructing a radar test system;
s2, calculating a signal-to-noise ratio A of a main lobe signal and a protection channel signal of a signal processing end;
s3, calculating a sidelobe shadow judgment threshold T r Is defined by the range of (2);
s4, according to the signal-to-noise ratio A of the main lobe signal and the protection channel signal of the signal processing end in the step S2 and the sidelobe concealment judgment threshold T in the step S3 r And (3) carrying out side lobe concealment threshold judgment.
2. The method for side lobe concealment based on an unbalanced receiving system as claimed in claim 1, wherein said step S1 is specifically: in a darkroom capable of receiving and transmitting microwave signals, an antenna with a protection channel is arranged on a turntable, the rear end of the antenna is connected with a radar signal processor, and the antenna is connected with a radar system.
3. The method for side lobe concealment based on an unbalanced receiving system as claimed in claim 1, wherein said signal processing side main lobe signal andsignal to noise ratio of protection channel signalWherein G is m For the receiving gain of the main lobe channel of the array plane, < + >>To protect the noise amplitude of the channel for the array plane, G p Receive gain for the plane protection channel, +.>Is the noise amplitude of the main lobe channel of the array surface.
4. The method for side lobe concealment based on an unbalanced receiving system as claimed in claim 3, wherein the signal-to-noise ratio of the main lobe signal and the protection channel signal at the signal processing end is
Wherein,is echo signal V 0 Radio frequency signal amplitude after array plane main lobe channel gain amplification, image frequency rejection mixer mixing, filtering amplification and automatic gain control>Noise amplitude of main lobe channel of signal processing end, < >>Is echo signal V 0 Radio frequency signal amplitude after array plane protection channel gain amplification, image frequency rejection mixer mixing, filtering amplification and automatic gain control>Protecting the noise amplitude of the channel for the signal processing end, G AGC For the link gain from the array plane to the signal processing end, < >>Is echo signal V 0 Radio frequency signal amplitude amplified by gain of array plane main lobe channel +.>Is echo signal V 0 The amplitude of the radio frequency signal is amplified by the gain of the array protection channel.
5. The method for side lobe concealment based on an unbalanced receiving system as claimed in claim 1 wherein said side lobe concealment decision threshold T r In the range T rl <T r <T rh ， Wherein G is sn Receiving gain of nth sidelobe of main lobe of array surface, G s1 And receiving gain of a first side lobe of the array main lobe.
6. The method for side lobe concealment in an unbalanced reception system as claimed in claim 5, wherein if the signal to noise ratio A of the main lobe signal and the guard channel signal of the signal processing end in step S2 is>T rh Judging that the main lobe is intercepted; if the signal-to-noise ratio A of the main lobe signal and the protection channel signal at the signal processing end in step S2<T rl And judging that the side lobe is intercepted.
7. The method for side lobe concealment based on an unbalanced receiving system as claimed in claim 1 wherein for each frame of signal, the signal-to-noise ratio a of the main lobe signal and the protection channel signal at the signal processing end is calculated in turn and the side lobe concealment threshold decision is made.
CN202311097204.7A 2023-08-29 2023-08-29 Method for side lobe concealment based on unbalanced receiving system Pending CN117129948A (en)

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Application Number Priority Date Filing Date Title
CN202311097204.7A CN117129948A (en) 2023-08-29 2023-08-29 Method for side lobe concealment based on unbalanced receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311097204.7A CN117129948A (en) 2023-08-29 2023-08-29 Method for side lobe concealment based on unbalanced receiving system

Publications (1)

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CN117129948A true CN117129948A (en) 2023-11-28

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