Study Of Range And Azimuth Ambiguities In Synthetic Aperture Radar

With the development of space-borne synthetic aperture radar (SAR), the minimum antenna area constraint turns out to be an important limitation to wide swath high resolution radar image. The antenna's length is needed to be long to avoid range ambiguity, while the antenna's cross length is needed to be long to avoid azimuth doppler ambiguity. A compromise must be made between the wide swath and high azimuth resolution in designing space-borne SAR. In order to break through the minimum antenna area constraint, we must be in face of the range and azimuth ambiguities. The aim of this paper is to study how to solve the range and azimuth ambiguities so as to obtain high quality image.Firstly, the origins of range and azimuth ambiguities and some basic problems about them is studied. Then, some ideas of solving range and azimuth ambiguities are given. Under the condition without azimuth ambiguity and that without range ambiguity, we propose a method to solve the range ambiguity and a method to solve the azimuth ambiguity separately. Lastly, the method presented in this dissertation is applied to the processing of real data of air-borne SAR , the results show the validity of the method.