基于地面频率控制的北斗系统载波伪码相关性设计

Design of Relativity between Carrier and Code Based on Frequency Control in Compass RDSS System

为了提高北斗系统RDSS/RNSS组合用户机的RDSS信号时延测量精度,提出一种基于地面频率控制的载波伪码相关性设计方法。该方法根据地面测量控制中心及标校站的观测数据,实时调整RDSS出站信号频率,使得用户机可以采用载波伪码相关性技术提高伪距测量精度。通过分析卫星实测数据,理论得出该方法可以提高伪码测距精度2.7dB。具体设备实验结果表明,该方法的伪码速率控制精度可以达到1.35×10-4Hz,满足控制精度要求。该方法还适用于提高站间时间同步等类似卫星转发式系统的延迟测量精度。

In order to improve the delay measurement precision of RDSS signal,a method utilizing the relativity between carrier and code is proposed. According to the observation data in the Measure Control Center( MCC) and calibration stations,the frequency of RDSS out-station signal is adjusted in real time,and the user receiver can use the relativity between carrier and code to improve the measurement precision. By analyzing the satellite data in practice,in theory the method can improve the pseudo-code ranging accuracy 2. 7dB. The experimental results with specific equipments show that the pseudo-code rate precision can reach 1. 35× 10- 4Hz,which meets the accuracy requirement. The method also can be applied to the similar satellite transponder systems,such as the time synchronization system between stations and so on.