基于码相关测距的MPSK性能分析

Analysis Performance of MPSK Based on Ranging Using Code Correlation

以8PSK为例介绍了MPSK信号的调制方式和解调系统。针对要求的系统提出了一种新的码相关测距方法,即利用解相关峰来控制起止计时脉冲。并设计了对应的解调系统框图。在此测距方法的基础上,对8PSK和BPSK进行了信噪比和精度的理论对比分析和实验仿真。仿真结果表明:在信噪比方面,同样的采样频率下,8PSK相对于BPSK信噪比下降很大;在精度上,8PSK相对于BPSK有所提高。为8PSK用于码相关测距提供了一定的借鉴和参考。

The modulate mode and demodulate system of MPSK signal with taking 8PSK for an example at the first brush are introduced. It proposed a new way to ranging using code correlation according to demanded system. This way controls the timer pulse through calculating the correlation peak. It also designed demodulate system frame. The difference between 8PSK and BPSK on Signal-to-Noise and precision in theory based on the proposed ranging way is analyzed and simulated. Simulation results indicate that 8PSK decline so much relative to BPSK in the same sample frequency at the SNR aspect. 8PSK improves precision relative to BPSK. The scheme is intended to provide reference and help for 8PSK in ranging using code correlation.