多载波混沌频率编码雷达信号设计与分析

Design and Analysis of Multi-carrier Chaotic Frequency Coded Radar Signal

近年来,正交频分复用(OFDM)技术在雷达波形设计中的应用受到广泛关注。在OFDM技术的基础上,使用混沌序列对子载波上的码元进行频率编码调制,得到一种基于混沌序列的多载波随机频率编码雷达信号,波形设计参数更多。通过仿真对该信号的自相关性能、互相关性能和抗干扰性能进行分析,同时进一步研究了波形参数对信号自相关性能的影响。仿真结果表明:文中设计的信号相比混沌相位编码OFDM信号有着更低的自相关旁瓣,同时还具有良好的互相关性能和抗干扰性能。

The application of orthogonal frequency division multiplexing(OFDM)technology in radar waveform design has received widespread attention in recent years. Based on OFDM technology, chaotic sequences is used to modulate the frequency of the symbols on sub-carriers, and a multi-carrier random frequency-coded radar signal based on chaotic sequence is obtained with more waveform design parameters. Then the auto-correlation performance, cross-correlation performance and anti-jamming performance of the signal are analyzed through simulation, and the effect of waveform parameters on the signal auto-correlation performance is further studied. Simulation results show that the signal designed in this paper has lower auto-correlation side-lobe than the chaotic phase coded OFDM signal, and also has good cross-correlation performance and anti-jamming performance.