基于预编码的正交频分复用雷达通信一体化信号设计

针对正交频分复用(orthogonal frequency division multiplexing,OFDM)雷达通信一体化信号中的通信信息影响其探测性能的问题,提出一种基于预编码的OFDM雷达通信一体化信号形式.利用具有较好相关特性的伪随机序列对一体化信号的通信信息进行预编码,以提高一体化信号的模糊函数性能,进而提升其探测能力.特别地,选取m序列、gold序列和Kasami序列进行预编码,并分析了扩展因子的影响和这3种序列的特点和适用环境.仿真结果表明,取相同扩展因子时,分别采用这3种序列进行预编码,不同程度地增加了OFDM一体化信号的峰值旁瓣比,将提升OFDM一体化信号的目标检测能力.

Design of OFDM Integrated Signal for Radar and Communication Based on Precoding

Aiming at the problem that the communication information in OFDM integrated signal for radar and communication affects its detection performance, a OFDM integrated signal for radar and communication based on precoding is proposed. The communication information of the integrated signal is precoded by using the pseudo-random sequence with better correlation characteristics, so as to improve the performance of the ambiguity function of the integrated signal and its detection ability. Especially, m sequence, gold sequence and kasami sequence are selected for precoding, and the influence of expansion factor, the characteristics and applicable environment of these three sequences are analyzed. The simulation results show that with the same expansion factor, these three sequences are used for precoding, which can increase the peak to side lobe ratio of the OFDM integrated signal and improve the target detection ability of the OFDM integrated signal.