Coherent Accumulation Algorithm for Frequency Group Coding Signal
王家东 1张伟科 2张盼3
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作者信息
1. 西安电子科技大学前沿交叉研究院,西安 710071
2. 中国人民解放军96901部队,北京 100094
3. 西安电子科技大学雷达信号处理全国重点实验室,西安 710071
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摘要
针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法.以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗干扰能力.同时针对频率捷变信号相位非相参带来的主瓣展宽和旁瓣抬高问题,设计了对应编码信号的相参处理方法.首先对回波脉压后的信号进行高分辨距离补偿,然后通过速度遍历插值和距离一致性校正实现脉组内相参处理,最后利用编码信号载频序列的优势实现脉组间相参处理.在仿真实验中,对构建的编码信号相较于LFM信号在抗干扰方面的优越性进行了验证,同时验证了所提相参处理方法相较于基于压缩感知的稀疏重构算法的有效性.
Abstract
In this paper,a method based on frequency group coding signal is proposed.Based on the linear frequency modulation(LFM)signal,the frequency group coding signal is constructed,which makes the pulse carrier frequency sequence of the transmitting signal a certain randomly.The anti-interference ability of the waveform is guaranteed.At the same time,a coherent processing method for the corresponding encoded signal is designed to address the issues of main lode broadening and side lode lifting problems caused by non coherent phase of frequency agile signals.Firstly,high-resolution distance compensation is applied to the compressed signal of the echo pulse,and then intra pulse coherence processing is achieved through velocity interpolation traversal and distance consistency correction.Finally,the advantages of the coding signal carrier frequency sequence are used to realize the intergroup coherent accumulation of the pulse group.In the simulation experiment,the coding signal of the building is verified compared with the advantages of LFM signal in the anti-interference,and the validity of the proposed method is compared to the sparse reconstruction algorithm based on compressive sensing.
关键词
捷变频/频率分组编码/相参积累/抗干扰/目标检测
Key words
frequency agility/frequency group coding/coherent accumulation/anti-jamming/target detection
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