摘要
星载微波散射计可以提供全球、全天候的海面风场数据,是能够同时测量海面风速和风向的有源微波遥感系统。扇形波束圆锥扫描体制微波散射计是一种新型体制的微波散射计,这类散射计采用多普勒滤波来提高方位分辨率。文章首先介绍了扇形波束圆锥扫描微波散射计的基本概念,在此基础上分析了天线圆锥扫描速度的范围及其对驻留时间的影响;随后结合卫星轨道参数和地球椭球模型,仿真分析了天线扫描区域内的多普勒特性,根据系统参数,仿真分析了方位多普勒滤波后的分辨率。
Spaceborne microwave scatterometers are active microwave remote sensors capable of measuring near-surface vector winds(both speed and direction) over the global oceans under all-weather conditions.A Rotating,Fanbeam scatterometer(RFSCAT) is a new microwave scattermeter concept.In this paper,Doppler discrimination is applied to improve azimuth resolution of the Rotating,Fanbeam scatterometer.The basic concept of RFSCATS is introduced and based on the concept the speed range of antenna conically scanning is analyzed with its influence on the target dwelling time.Subsequently combined with satellite orbit parameters and earth ellipsoid model Doppler characteristics in the antenna scanning field is simulated and analyzed.According to system parameters the simulation and analysis of azimuth Doppler discrimination resolution is given.
出处
《空间电子技术》
2012年第2期32-36,共5页
Space Electronic Technology
关键词
微波散射计
扇形波束
圆锥扫描
多普勒滤波分辨率
Microwave scatterometer
Fanbeam
Conically scanning
Doppler discrimination resolution
