宇航学报

宇航学报 ›› 2014, Vol. 35 ›› Issue (8): 961-968.doi: 10.3873/j.issn.1000-1328.2014.08.014

• 电子信息 • 上一篇    下一篇

基于定标站的旋转扫描扇形波束散射计在轨定标方法

朱金台，董晓龙   

  1. 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
  • 收稿日期:2013-07-02 修回日期:2013-10-21 出版日期:2014-08-15 发布日期:2014-08-25
  • 基金资助:

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

An In Orbit Calibration Method for Rotating Fan Beam Scatterometer Base on Ground Calibration Stations

ZHU Jin tai,  DONG Xiao long   

  1. 1.The CAS Key Laboratory of Microwave Remote Sensing, Center for Space Science and Applied Research,
    Chinese Academy of Sciences， Beijing 100190，China；  2. University of Chinese Academy of Sciences， Beijing 100049，China
  • Received:2013-07-02 Revised:2013-10-21 Online:2014-08-15 Published:2014-08-25

PDF

748

摘要：

RFSCAT具有较宽刈幅并能够对同一个风单元提供较多的方位角和入射角观测组合，提高风场反演精度。为了达到设计的风场反演精度，必须对散射计进行在轨外定标。该文基于中法海洋卫星（Chinese French Oceanography Satellite, CFOSAT）雷达散射计的系统参数，给出了一种利用地面定标站(Calibration Ground Station，CGS)对RFSCAT进行在轨外定标的定标方法，并利用仿真数据进行验证。该方法能够达到0.01°的姿态角估计精度和0.1〖KG*9〗dB天线方向图估计精度，实现对RFSCAT天线方向图在轨监测和验证。

关键词: 雷达散射计, 旋转扫描扇形波束散射计, 在轨定标, 地面定标站

Abstract:

Compared with other available scatterometers, the RFSCAT can provide a wider swath and more observation combinations of azimuth/incident angels for a wind vector cell (WVC), and have been proved to be able to improve the inversion accuracy of wind field. Accuracy of the inversed wind vector over the near ocean surface depends on the accuracy of radar cross section (σ 0) measurement. For this purpose, accurate in orbit calibration is required. In this paper, according to the systematic parameters of the Chinese French Oceanography Satellite (CFOSAT) RFSCAT, a method for external calibration of RFSCAT based on Ground Calibration Stations (CGSs) is proposed, and is verified by simulations. The technique is used to determine satellite attitude estimation accuracy up to 0.01° and antenna gain estimation accuracy up to 0.1〖KG*9〗dB, which is able to monitor and verify its antenna gain pattern in orbit.

Key words: Radar scatterometer, Rotating fan beam scatterometer (RFSCAT), In orbit calibration, Ground calibration station (CGS)

中图分类号: