基于脉内LFM-Costas频率步进的抗间歇采样干扰方法  

Anti-intermittent sampling jamming method based on intra-pulse LFM-Costas frequency stepping

作　　者：张建中 穆贺强[1] 文树梁[1] 廖胜男 沙明辉 ZHANG Jianzhong;MU Heqiang;WEN Shuliang;LIAO Shengnan;SHA Minghui(Beijing Institute of Radio Measurement, Beijing 100854, China;The Second Academy ofChina Aerospace Science and Industry Corporation Limited, Beijing 100854, China)

机构地区：[1]北京无线电测量研究所,北京100854 [2]中国航天科工集团第二研究院,北京100854

出　　处：《系统工程与电子技术》2019年第10期2170-2177,共8页Systems Engineering and Electronics

摘　　要：线性调频(linear frequency modulation,LFM)分段脉压对抗间歇采样干扰时,子脉冲顺序步进,使得采样子脉冲与相邻子脉冲脉压后,残余信号积累从而形成干扰带;干扰抑制时信号不连续采样,产生谐波分量。针对这两个问题,提出一种基于脉内Costas频率步进的LFM波形抗间歇采样干扰方法。该波形综合LFM和Costas编码的优点,具有理想图钉型的模糊函数,不仅可以抑制干扰带,还可以大大降低谐波分量,最终提高抗干扰性能。理论推导和仿真分析验证了该方法的有效性。When linear frequency modulation (LFM) segmented pulse compression used to oppose the intermittent sampling jamming, the sub-pulses are sequentially stepped. After the sampling sub-pulses and the adjacent sub-pulses compress, the residual signals accumulate to form an interference band. When suppressing and interfering signals to sample continuously, harmonic components are produced. Aiming at these two problems, an anti-intermittent sampling method based on intra-pulse Costas frequency stepping LFM waveform is proposed. The waveform combines the advantages of LFM and Costas-coding, has an ideal ambiguity function of pin type. It can not only suppress the interference band, but also greatly reduce the harmonic components, ultimately improve the anti-jamming performance. The validity of the method is verified by theoretical deduction and simulation analysis.

关 键 词：间歇采样 分段脉压 抗干扰方法 频率步进 COSTAS编码 

分 类 号：TN974[电子电信—信号与信息处理]