多载频混沌相位编码雷达信号处理研究

雷达波形设计与信号处理是现代雷达研究领域的热点。文中用具有弱结构性的混沌二相码对正交频分复用雷达信号的相位进行调制得到一种多载频混沌相位编码雷达信号,推导了该信号脉冲压缩的输出表达式,用分段FFT脉压法对该信号进行脉压,比较了该信号和多载频巴克码相位编码信号的脉压效果,并对该信号的接收处理过程进行了仿真。仿真结果表明:多载频混沌相位编码雷达信号具有更优异的脉压性能,能够实现在信噪比很低的情况下多目标的精确测距和测速,同时由于其灵活的结构、复杂的调制方式及类噪声的特性,提高了雷达的低截获性能。

A Study on Multi-carrier Chaotic Phase Coded Radar Signal Processing

Radar waveform design and signal processing is a current research focus of modern radar system. Chaotic binary codes with weak structure characteristic are used to modulate the phase of OFDM pulse train signal so as to design a new multi-carrier chaotic phase coded (MCPC_Chaos) pulse train signal. The matched filter's output expression of the designed signal is derived and the segment FFT method is used to complete pulse compression. The pulse compressed result of multi-carrier Barker code phase coded signal is compared with the designed signal. Also the signal processing procedure of MCPC_Chaos is simulated. Simulation results show that MCPC_Chaos signal has more excellent pulse expression result and can realize range and velocity measurement of multi-target in low signal to noise ratio condition. Besides that, the LPI performance of radar is improved due to the complex modulation mode, flexible structure and random-like property of this signal.