基于MIMO雷达的重复线性冗余多载波相位编码信号抗间歇采样干扰研究

该文基于雷达信号时域间断采样获得间歇采样和重复干扰（ISRJ）的原理，提出了一种基于多输入多输出（MIMO）雷达和多载波相位编码（MCPC）雷达信号的新型重复线性冗余（RLR）波形，即RLR-MCPC信号。从波形设计的角度出发，对于采用MCPC多相编码结构的信号，采用混沌序列对每个码片进行时域编码。此外，在时频域中，一些码片通过重复线性排列进行冗余编码。频域上，每个子载波都包含冗余编码，时域上，脉内任意时间段都包含冗余编码。在MIMO雷达中，雷达信号按子载波分成多路通道进行传输，在每路通道中对接收信号进行处理，保证间歇采样不论在时域中如何采样，都会在某一路通道上采样到冗余信息，从而与匹配滤波器失配。所以，RLR处理使信号具有抗间歇采样转发干扰（ISRJ）的特性，能有效抑制ISRJ假目标的干扰。结果表明，在该文设计的典型参数下，经过脉冲压缩后的RLR-MCPC信号的SJR改善因子比MCPC信号优化了2.5~3 dB。 

Research on Multi-Carrier Phase Code Signal Against Interrupted Sampling Repeater Jamming Based on MIMO Radar

? ?Based on the principle that Intermittent Sampling and Repeater Jamming （ISRJ） is obtained by discontinuous sampling of radar signal in time domain， a novel Repetitive Linear Redundancy （RLR） waveform based on Multiple Input Multiple Output （MIMO） radar and Multi-Carrier Phase Code （MCPC） radar signal is proposed， namely RLR-MCPC signal. From the point of view of waveform design， chaotic sequences are used to encode each chip in time domain for the signal with MCPC multiphase coding structure. Moreover， in the time-frequency domain， some chips are redundantly coded by repeated linear arrangement. In the frequency domain， each subcarrier contains redundant coding. And in the time domain， any time period in the pulse contains redundant coding. In MIMO radar， the radar signal is divided into multiple channels for transmission according to subcarriers. Then， the received signal is processed in each channel. Ensure that the intermittent sampling， whether in time domain or frequency domain， will sample redundant information in a channel. So it cannot match the matched filter. Therefore， the RLR processing makes the signal have the characteristics of anti-Interrupted Sampling and Repeater Jamming （ISRJ）， which can availably restrain the interference of ISRJ false target. Under the typical parameters designed in this paper， the results indicate that the SJR improvement factor of RLR-MCPC signal after pulse compression is higher by 2.5~3 dB compared with the MCPC signal.