基于MATLAB/SIMULINK的海面回波模拟器仿真与分析

星载雷达高度计是一种重要的对海洋进行精确测量的主动式微波遥感器。因为高度计能够有效地测量卫星到海面的高度、海面有效波高和海面后向散射系数,它在海洋大地水准面研究和海洋应用研究的诸多方面得到了广泛的应用。海面回波模拟器能够接收和处理高度计信号,产生海面回波波谱来调制高度计信号,最后精确延时后发射回高度计,是在地面对高度计进行测试和定标的一种有效手段。由于功能的全面性,回波模拟器是一个复杂度不亚于高度计本身的系统,因此,对回波模拟器的分析和仿真对于指导它的设计、确定它的精度以及定标的效果有着重要意义。介绍了回波模拟器的结构,分析了海面回波波谱的产生原理并设计了回波模拟器的SIMULINK仿真模型,给出并分析了仿真结果。

MATLAB/SIMULINK Based Analysis and Simulation of Return Signal Simulator

Spaceborne radar altimeter is an important active microwave remote sensor which is able to measure the oceans with high accuracy.As altimeter is able to measure the height,SWH and backscattering coefficient,it has been widely used in various aspects of ocean research.Sea surface return signal simulator(RSS) receives and processes the chirp signal transmitted by radar altimeter.It then generates sea surface wave spectrum to modulate the altimeter chirp and retransmits the modulated signal back to the altimeter,after precisely controlled delay of time.RSS is an effective way for altimeter prelaunch test and calibration.RSS is a highly complex system with comprehensive functions,and thus the simulation and analysis have significant meaning for its design,precision analysis and calibration application.This thesis introduces the structure of RSS,analyses the sea echo spectrum generation principle,designs a SIMULINK model for RSS and gives the simulation result.