基于Walsh码的波束标校信号功率误差测量算法

Measurement Error of Calibration Signal Power Based on Walsh Code

介绍了基于能量测向体制的移动通信卫星系统波束指向测量原理,给出了基于Walsh码的波束标校信号功率误差测量算法流程。对Walsh码的自相关特性、互相关特性及捕获特性进行了分析,选择了捕获性能良好的Walsh码字,并对选定码字的相关特性进行了仿真,给出了选定的Walsh码字在同步及非同步情况下的相关特性,仿真结果和理论分析结果吻合。分析了定时恢复误差、载波恢复误差对功率误差测量的影响。给出了基于Walsh码的标校信号功率误差测量结果,测试结果表明测量误差满足系统指标要求,Walsh码可以作为标校信号使用。

This paper first introduces the theory of the orientation measurement and the arithmetic flow of the beam calibration power measure error in the mobile satellite communication system.Then it analyzes the self-correlation characteristic,mutual correlation characteristic and capture characteristic of the Walsh code,according to the correlation characteristic of Walsh code.And the Walsh code number is selected which has perfect capture characteristic,simulation of the self and mutual correlation characteristic is done to validate the conclusion.It also analyzes the carry error and timing error affects to the measure error based on the selected code.Given the test results of the power error,test results show Walsh code can be used as the calibration signal.