Radar anti-interference method by utilizing polarization cancellation

A radar and auxiliary channel technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of main lobe distortion, difficulty in frequency domain filtering, and low efficiency of anti-interference methods, so as to improve the signal-to-noise ratio and detection ability Effect

Inactive Publication Date: 2015-03-04
WUHAN BINHU ELECTRONICS
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Problems solved by technology

Large time-width signals, coherent accumulation, burn-through mode, etc. all belong to the anti-jamming method of "striving energy". Since radar echoes are two-way propagation, and interference signals are one-way propagation, the efficiency of "striving energy" anti-jamming methods is relatively Low
For blocking or aiming noise suppressio

Method used

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  • Radar anti-interference method by utilizing polarization cancellation
  • Radar anti-interference method by utilizing polarization cancellation
  • Radar anti-interference method by utilizing polarization cancellation

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[0021] Glossary: ​​Standard comparator: a device that can transmit radar signals with lower power.

[0022] This system requires the radar to include a dual-polarized antenna and a superheterodyne receiver with at least two channels. Such as Figure 4 When the radar is working, the waveform generator generates the transmission waveform, which is amplified by the power of the transmitter and transmitted from the H antenna. The circulator in the figure is a duplex device. The echo signal and interference enter the two receivers from the H antenna and the V antenna. After the receiver’s mixing and down-conversion, the 15MHz IF signal is transmitted to the signal processing system.

[0023] For the problem of the consistency of the amplitude and phase of the H receiving channel and the V receiving channel, the hardware configuration of the present invention can also add a standard comparator. Align the transmitter antenna of the comparator at the normal direction of the radar receiver...

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Abstract

The invention relates to the field of radar signal processing and especially relates to a radar anti-interference method by utilizing polarization cancellation. In the method, through determining a cancellation main channel and an accessory channel, and then, by utilizing the main channel and the accessory channel as well as channel weight coefficients thereof, no-interference signals are obtained after cancellation. The method is especially suitable for escort self-defense noise interference and general clutter interference; signal-to-clutter-noise ratio of the system can be greatly improved, detection of follow-up radar signal processing is convenient, and detection capability of the radar can be effectively improved under the complex electromagnetic environment.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a radar anti-jamming method using polarization cancellation. Background technique [0002] Noise suppressing jamming is a commonly used jamming method, which floods the target echo with high-power noise, making it impossible for the radar to detect the target. The main ways to combat noise-suppressive interference include the use of large-time-width signals with high duty ratios (high average power), coherent accumulation, burn-through operating modes, etc., as well as adaptive sidelobe cancellation technology, narrow-band filtering, etc. filtering method. Large time-width signals, coherent accumulation, burn-through mode, etc. all belong to the anti-jamming method of "striving energy". Since the radar echo is two-way propagation, and the interference signal is one-way propagation, the anti-jamming method of "striving energy" is more efficient Low. For blocking or aiming...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/32G01S7/36
Inventor 孙大伟姜立新张建明王洪军施龙飞
Owner WUHAN BINHU ELECTRONICS
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