非连续谱MCPC信号处理研究

Discontinuous spectra MCPC signal processing

摘要:

通常高频段寂静频带呈随机断续分布,为充分利用高频段资源,本文采用MCPC(Multi-carrier Phased-coded)信号形式设计非连续谱信号．对随机断续谱MCPC信号的目标回波公式进行了推导,并分析非连续MCPC信号在不同信噪比、doppler情况下性能．基于快速傅里叶变换提出多载频非连续MCPC信号处理流程．首先进行速度处理,将不同载频速度信息统一,再通过IFFT将不同载频的距离信息进行相参综合处理．并针对非连续频谱信号产生较高旁瓣等级,设计目标函数,利用凸优化理论求解最小二乘滤波器,对相参综合处理距离维信号进行旁瓣抑制处理,较好解决了高频雷达距离分辨力差及随机断续谱较高旁瓣问题．

Abstract:

To fully exploit discontinuous spectra, this paper adopts MCPC (Multi-carrier Phased-coded) signal structure to design discontinuous spectra waveform. The signal adopts cycle complementary P4 coded, the echo expression of the random discontinuous spectra MCPC signal is deduced, and the signal performance in different SNR, Doppler is analyzed. Based on the fast Fourier transform, we propose the processing algorithm flow of discontinuous spectra MCPC signal. The algorithm does the velocity processing, unifies the velocity information under different carrier frequencies, and then by IFFT coherent synthesizes different frequencies range information. For the higher PSL problem generated by discontinuous spectra, we design objective function, use CVX toolbox to solve the least square filter coefficients, and then restrain sidelobes level that coherent processing generating. 