Simulation And Optimization Of Spaceborne Microwave Scatterometer

Spaceborne microwave scatterometer can effectively measure wind speed and direction of sea surface. It can provide global, all-day, high-accuracy, high-resolution and short cycle of sea surface wind data. This article focuses on the system simulation of pencil beam conically scanning scatterometer and factors which impact on the backscattering coefficient measurement accuracy, and explores the way to improve system performance.This article discusses in detail the structure of the scatterometer simulation system, and then defines the function of each module. According to the scatterometer measuring principle, we choose the backscattering coefficient standard deviation K p as the study object, and summed up the algorithms.In this paper, we simulate and analyze microwave scatterometer precision model from two perspectives. On the one hand, under the same resolution, when change the scatterometer's signal bandwidth, we come to the results of different input wind field. Also we analyze how the signal to noise ratio (SNR) of the returned signal from sea surface and the number of independent samples of backscattering measurement impact K p.In addition, we also introduce the wind retrieval evaluation parameter- FoM which can further analyze the impacts of K p on the wind vector retrieval accuracy. According to the simulation results, the scatterometer systems with best performances have been selected to compare with SeaWinds scatterometer.On the other hand, when change the spatial resolution, we get the conclusion that the accuracy of backscattering coefficient measurement and the wind vector retrieval accuracy will change with the resolution. These conclusions above could offer references for the design and realization of next generation of spaceborne microwave scatterometer.