摘要
K波段微波测距系统(KBR)是低-低卫星跟踪卫星模式(SST-LL)重力测量卫星最关键的测量设备,其性能直接影响反演的地球时变重力场模型。超稳定振荡器(USO)作为整个KBR系统的频率基准,其稳定度对KBR系统测距精度有着重要影响。本文根据双向测量载波相位对比原理构建KBR仿真系统,利用幂率法模拟不同频率稳定度下的USO噪声误差,馈入到KBR仿真系统中进行仿真。结果表明,利用该模型当USO频率稳定度的阿伦方差达到1×10-12/s时,可满足公布的GRACE卫星KBR系统10μm的测距误差要求。
The K Band Ranging System （KBR） is the most important instrument of the gravity measurementsatellite of Low-Low Satellite-Satellite Tracking （SST-LL） mode, which directly affects the Earth time-variation gravity model. As the frequency standard of the KBR system, the stability of Ultra Stable Oscillator （USO） has a great influence on the whole performance of the KBR. Firstly, based on the dual one-way ranging principle, a system structure was designed for high precision KBR measurement simulation in the paper. Secondly, the Power-Law method was used to simulate the noise of USO with different Allan variances and the system error due to the USO stability was estimated with the experimental results. The result showed that the errors requirements of KBR in GRACE（10μm） could be achieved when the Allan variance（1s） of USO is 1 × 10- 12/s.
出处
《测绘科学》
CSCD
北大核心
2014年第6期8-11,89,共5页
Science of Surveying and Mapping
