USO-KBR测距系统建模与仿真  

Modeling and Simulation for USO-KBR Ranging System

作　　者：辛宁[1,2] 邱乐德[2] 张立华[1] 丁延卫[1] 覃政[1] 

机构地区：[1]航天东方红卫星有限公司,北京100094 [2]中国空间技术研究院,北京100094

出　　处：《航天器工程》2012年第5期91-96,共6页Spacecraft Engineering

基　　金：国家重大科技专项工程

摘　　要：K频段微波测距(KBR)系统是低-低卫星跟踪卫星(SST-LL)重力测量卫星的关键载荷之一,其性能直接影响地球重力场空间变化率的测定结果,而KBR系统中超稳振荡器(USO)的稳定度对KBR系统整体测距精度有着重要影响。文章根据双向测量载波相位对比原理和USO幂率谱模型,对KBR系统进行了建模。首先,描述了测距系统的基本原理、系统功能组成及适用于KBR系统的数学模型;然后,利用Matlab软件对"重力恢复和气候实验"(GRACE)卫星的KBR系统进行了仿真。仿真结果表明,采用该模型和方法后获得的双向测距中误差(RMSE)为9.81μm,与公布的GRACE卫星KBR系统10μm的中误差相符。文章为KBR系统的工程设计提供了仿真分析工具,可为工程应用提供设计参考。The K band ranging （KBR） system is one of the most important instruments of the low-low satellite-satellite tracing （SST-LL） gravity measurement satellite which directly affects the Earth gravity field space resolution. The stability of ultra stable oscillator （USO） has a great influence on the whole performance of the KBR. Based on the dual one-way ranging principle and USO power law model, a system structure is presented for high precision KBR measurement sim- ulation. The basic principle, function composition and appropriate mathematical models used in the simulation are studied, and a simulation system is proposed to simulate KBR of GRACE with Matlab. The result shows that the root mean square error（RMSE） of dual one-way ranging is 9.81μm, which is the same as that of KBR in GRACE （10μm）. The model can be considered as a simulation and analysis tool for KBR system design and a reference for the project application.

关 键 词：重力测量卫星 低-低卫星跟踪卫星 K频段微波测距系统 超稳振荡器 仿真 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] V474.2[自动化与计算机技术—计算机科学与技术]