Research On The Inversion Algorithms Of Synthetic Aperture Microwave Radiometer

In order to increase the space resolution of microwave radiometer, synthetic aperture technology is introduced.The basic theory of synthetic aperture used in microwave radiometer is introduced according to interferometry principle. The principle of general case inversion algorithms is presented. The errors are grouped according to the analysis of impact of system imperfections on synthetic aperture microwave radiometer in the given literature. Then Fourier transform inversion algorithm and Backus-Gilbert inversion algorithm are expatiated. The performances between Fourier transform inversion algorithm and Backus-Gilbert inversion algorithm are compared by means of numerical simulation, the results show the validity of BG inversion algorithm.Synthetic aperture radiometer inversion algorithm module is designed and programmed by Visual C++ language. The module is open, and it's adapts to analyse and validate the performance of various inversion algorithms. It is a part of the microwave radiation detecting simulation system.Two new inversion algorithms are presented. One is named a priori information based inversion algorithm, which eliminates the effect of atmosphere background radiation by using the information exploited from the application environment. The simulated results show that the effect of atmosphere background radiation is cleared up. The other is suitable to deal with the situation of losing baselines, which replaces the losing data by approximate visibilities. Point source and extended source are used as the background respectly in the experiment and theory analysis. The experiment results show that the quality of reconstruction image is improved.