混沌多时编码调相雷达波形设计

Radar Waveform Design of Joint Phase Modulation Based on Chaos and Multi-Times

单一调制的雷达信号的波形简单、变化少,使得雷达信号更容易被截获,抗干扰性能也较差。针对这一问题,设计了一种混沌多时编码与相位调制相结合的波形产生方法。首先根据线性调频信号的参数并按照多时编码规则产生一系列相位,每个相位状态持续时间不同;再对相位用混沌序列进行编码,使每个子脉冲具有不同的相位状态。仿真结果表明,两种混沌多时编码调相雷达信号的自相关旁瓣峰值最大值分别达到-27.92dB和-27.60dB,相比于只加入混沌编码调相的信号或多时编码信号,其相关性得到了极大提升。结果表明,混沌多时编码调相信号既继承了相位调制信号的优点,优化了功率谱,使其变得更平坦,同时又具有良好的抗噪声干扰性能和正交性,波形也更加复杂多变,是一种理想的雷达信号。

The single modulation radar waveform has low complexity, which limits the low interception and anti- interference performance of radar. The joint phase modulation based on chaos and multi-times in radar waveform is proposed to solve this problem. Firstly. the muhi-times encoding is generated by the parameters of LFM signal and the duration of each phase is different. Then, the chaotic sequence is used to encode the phase, which makes each sub-pulse have different phase states. Simulation results show that the maximum ACF values of the two signals through different chaotic and multi-times coding modulations reach --27.92 dB and 27.60 dB respectively. Its correlation performance has been greatly improved. The experimental results show that the joint phase modulation based on chaos and multi-times in radar waveform inherits the advanta- ges of phase modulated signals, and optimizes the power spectrum, and increases the ability to counter noise and interference. The waveform has more complexity.