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Anti-co-frequency asynchronous interference method based on interference spectrum and mtd filter amplitude and phase characteristics

A technology of asynchronous interference and characteristics, applied in the field of anti-co-frequency asynchronous interference based on the amplitude and phase characteristics of the interference spectrum and MTD filtering, and suppressing the same-frequency asynchronous interference, it can solve the problem of interference or target misjudgment, the difference threshold setting cannot take into account, The problem of missed alarms, etc., can achieve the effect of eliminating interference or target misjudgment, eliminating target missed alarms, and suppressing same-frequency asynchronous interference.

Active Publication Date: 2018-11-23
WUHAN BINHU ELECTRONICS
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Problems solved by technology

[0006] The present invention provides an anti-co-frequency asynchronous interference method based on the interference spectrum and MTD filter amplitude-phase characteristics, which solves the existing radar anti-asynchronous interference method because the difference threshold setting cannot take into account both strong and weak interference, and the interference and the target are at the same distance The problem of interference or target misjudgment and target missing alarm caused by the simultaneous existence of units can effectively suppress the same frequency and asynchronous interference while effectively detecting the target

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  • Anti-co-frequency asynchronous interference method based on interference spectrum and mtd filter amplitude and phase characteristics
  • Anti-co-frequency asynchronous interference method based on interference spectrum and mtd filter amplitude and phase characteristics
  • Anti-co-frequency asynchronous interference method based on interference spectrum and mtd filter amplitude and phase characteristics

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[0029] Glossary: ​​MTD: Moving Target Detection

[0030] PD: Pulse Doppler

[0031] FIR: Finite Impulse Response Transverse Filter

[0032] Fr: radar working repetition frequency

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] The working principle of the present invention is: in the radar of MTD or PD system, the output of Doppler filter bank can reflect the spectral feature of Doppler domain to a certain extent, when there is asynchronous interference, will produce similar impulse response , in the entire Doppler domain, the amplitude of all Doppler filter output signals should be a fixed value, and the target signal generally only appears in a few adjacent Doppler channels, so, considering the noise or target Existence, when it is detected that more than a certain number of Doppler filter output amplitudes exceed the specified conventional detection threshold, it can be judged...

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Abstract

The present invention relates to a method for common frequency asynchronous interference resistance in the radar signal processing field, especially to a common frequency asynchronous interference resistance method based on the interference spectrum and the MTD filtering amplitude-phase characteristics which can be widely applied in the radar signal processing system. According to the invention, the analysis of spectrum for the asynchronous interference is completed through the MTD filter amplitude-phase characteristics, the time-frequency two-dimensional combination detection is realized through combination of each channel frequency domain information on the basis of each Doppler channel time domain detection in the MTD processing process, and the effective inhibition of the common frequency asynchronous interference is completed while effectively detecting targets so as to basically eliminate the problems of interference or target misjudgement and target false dismissal.

Description

technical field [0001] The invention relates to a method for suppressing co-frequency and asynchronous interference in the field of radar signal processing, in particular to a method for resisting co-frequency and asynchronous interference based on interference spectrum and MTD filter amplitude and phase characteristics, which can be widely used in radar signal processing systems. Background technique [0002] Radar anti-jamming refers to the general term for all tactical and technical measures that destroy and disrupt the enemy's radar to detect one's own target information. For radar, except useful signals with target information, other kinds of useless signals are interference. Modern warfare is usually a five-dimensional integration of "sea, land, air, sky, and electricity". Radar networking or radar formation operations often occur, but one of the biggest problems often faced in this way is the mutual interference between radars. The more radars there are, the The clos...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/36G01S7/41
Inventor 黄志华李青史光曜徐晓
Owner WUHAN BINHU ELECTRONICS
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