扩频系统多通道相位差测量技术

Multi-Channel Phase Difference Measurement Based on Spread Spectrum System

论述了扩频无线电信号侦收和测向等应用领域中,在多通道天线和接收机后端采用数字处理手段,在低信噪比下实现多通道相位差精确提取的方法。阐述了多通道相位差提取的基本工程模型、中频信号采样处理方法、普通ASK调制信号的相位差提取方法,以及BPSK调制的扩频信号的相位差提取方法,给出了基于MATLAB7.0.1平台的仿真图形和结果。该技术已在工程中成功实现。

The method of acquiring the phase difference of multi - channel in case of low SNR（Signal - to- Noise Ratio） is discussed,by means of using digital processing technique at the back - end of RF antenna and receiver. The method can usually be used in some applications, such as wireless signal detecting or direction measurement. The basic engineering model of multi - channel phase measurement is described as well as the process of A/D sampling on intermediate frequency（IF）, the method of acquiring phase difference on ASK modulated signal ,and the method of acquiring phase difference on BPSK modulated spread spectrtnn signal. Simulation based on Matlab7.0.1 is provided. The technique discussed in this paper has been successfully applied in project.