一种提高空间伪码扩谱测距精度的实用方案

应用伪码时延的码元整周期数进行粗测距，将接收端伪码信号进行锁相提纯及差额测相技术对伪码时钟信号相移精确测量以达到精测距．这一提高空间伪码扩谱测距精度的实用方案，在计时时钟频率仅为30MHz的条件下，测距精度优于0．3m，量化误差小于0．2m，并具有测距范围大和通用性强等特点．

A Practical Method to Improve Space Spread-spectrum PN Code Ranging Accuracy

The number of integral periods of PN code delay element time was used to measure the distance roughly, PLL was used to purify PN code clock signals of receiving terminal, and the difference frequency phase measurement technique was used to accurately measure phase shift of PN code clock signals and to finally accurately measure the distance. The ranging accuracy may be better than 0.3m and the quantization error may be better than 0.2m while the timing clock frequency is as low as 30MHz. This method also has characteristics of wide range of distance measurement and powerful versatility .