Frequency-agility anti-interference signal coherent accumulation method for frequency block coding

A technology of group coding and frequency coding, applied in the fields of radar, radar anti-jamming, and target detection, it can solve the problems such as the inability of coherent accumulation of frequency agile signals and the occurrence of false peaks, so as to improve the anti-jamming performance, solve false peaks, and free waveforms. high degree of effect

Pending Publication Date: 2022-05-24
XIDIAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and propose a method for coherent accumulation of frequency-agile anti-jamming signals with frequency block coding, which is used to solve the problems in the prior art that the frequency-agile signals cannot be coherently accumulated or accumulated Solve the problem of false peaks, while improving the degree of freedom of the waveform

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  • Frequency-agility anti-interference signal coherent accumulation method for frequency block coding
  • Frequency-agility anti-interference signal coherent accumulation method for frequency block coding
  • Frequency-agility anti-interference signal coherent accumulation method for frequency block coding

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[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] refer to figure 1 , the present invention comprises the steps:

[0034] Step 1) Perform frequency group coding on the pulse signal:

[0035] The frequency agile signals generated by the frequency agile radar in a coherent processing time are divided into M groups on average, each group contains N pulses, and the carrier frequency of each pulse is frequency-coded to obtain a composition consisting of M groups of frequency-coded pulses. The set F of , where M=32 and N=64 are taken in this embodiment, and the carrier frequency of the nth frequency code pulse of the mth group in F is f mn =f 0 +g mn Δf, m=1,2,...,M,n=1,2,...,N,f 0 is the reference carrier frequency, Δf is the minimum frequency hopping interval, g mn is the frequency code value of the nth frequency code pulse of the mth group, and the pulse frequency code value ...

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Abstract

The invention provides a frequency-agility anti-interference signal phase-coherent accumulation method for frequency block coding, and solves the problem that phase-coherent accumulation of frequency-agility signals cannot be realized or false peaks appear after accumulation in the prior art while improving the degree of freedom of waveforms. The method comprises the following implementation steps: firstly, performing frequency block coding on pulse signals; then preprocessing the echo signal of each pulse after frequency coding, and performing speed traversal processing on each preprocessed echo signal; coherent projection processing is carried out on each signal after speed traversal; and finally, accumulating all signals after coherent projection to realize frequency agility anti-interference signal coherent accumulation. According to the method, the agile freedom degree of the frequency agile anti-interference waveform is increased, coherent accumulation of the frequency agile anti-interference waveform is achieved, and the anti-interference performance and the target detection performance of a frequency agile system radar are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a coherent accumulation method of frequency agile frequency blocking anti-jamming signals, which can be used in the fields of radar anti-jamming, target detection and the like. Background technique [0002] Frequency agile radar is a pulse radar that transmits frequency agile signals, the carrier frequency of which can be randomly agile within a certain range or quickly hop according to a designed law. Frequency agile radar can reduce the interception probability of jammers and effectively suppress cross-pulse forwarding deception jamming and narrow pulse aiming suppressing jamming because the parameters of the frequency agile signal it transmits change rapidly; at the same time, the frequency agile signal emitted by frequency agile radar The frequency hopping bandwidth is large, and the instantaneous narrow bandwidth can be synthesized into a large bandwidth, so the range resolution...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282G01S7/292G01S7/295G01S7/36
CPCG01S7/282G01S7/292G01S7/295G01S7/36Y02A90/10
Inventor 李亚超王宇王家东张盼张鹏张磊郭亮张志军
Owner XIDIAN UNIV
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