利用定标站对旋转扫描扇形波束散射计的信号频率估计  

Signal Frequency Estimation for Rotating Fan-beam Scatterometer Using Ground Calibration Station

作　　者：朱金台[1,2] 董晓龙[1] 云日升[1] 

机构地区：[1]中国科学院空间科学与应用研究中心中国科学院微波遥感技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《宇航学报》2014年第10期1189-1197,共9页Journal of Astronautics

基　　金：国家自然科学基金(41006109);国家自然科学基金(41206167)

摘　　要：该文基于中法海洋卫星(Chinese-French Oceanic Satellite,CFOSAT)雷达散射计系统参数,给出了可行的在轨Doppler预补偿方法并利用地面定标站实现对RFSCAT信号频率的估计。对比了3种信号频率估计方法,通过仿真分析表明,可达到优于0.05k Hz的频率估计精度。仿真结果表明,通过把估计的频率与Doppler预补偿查找表和Doppler频率进行比较,可实现对RFSCAT在轨Doppler预补偿状态及生命周期内的载频漂移监测。Based on system parameters of the rotating fsn-beam scatterometer （RFSCAT） onboard Chinese-French oceanic satellite （CFOSAT）,a proper Doppler pre-compensation algorithm for RFSCAT is given and RFSCAT signal frequency is estimated using Ground Calibration Station （GCS）.Three frequency estimation algorithms are compared and their frequency estimation accuracies are better than 0.05 kHz.The data used in this paper is acquired by GCS during satellite passing overhead.Analysis of data received by GCS,the scatterometer Doppler compensation frequency and the Doppler frequency shift are examined for deviation from nominal values,and simulations result show that it is able to monitor and determine the scatterometer carrier frequency drift over its life cycle.

关 键 词：旋转扫描扇形波束散射计 地面定标站 Doppler预补偿 频率估计 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]