Study On Digital Receiver In SAR Based On Software Defined Radio

The trend of synthetic aperture radar is a small-scale and intelligent radar with multiplefrequency bands, multiple polarizations and multiple modes in the future. It is possible togreatly improve the performance and flexibility of synthetic aperture radar by introducingsoftware defined radio into it. The dissertation the application of software defined radio insynthetic aperture radar in system level and studies deeply digital receiver based onsoftware defined radio. The dissertation includes some engineering implement studyrelating to practically application and forward looking research on current hot topics. Themain works and innovations of this dissertation are as follows:[1] All algorithms of digital quadrature demodulation are divided into two classes.With-mixer algorithms and mixer-free algorithms are proposed according to a newcriterion. The computation cost and performance of different digital quadraturedemodulation algorithm at the same echo signal are analyzed. Provide a designreference for synthetic aperture radar receiver by suggesting optimum algorithm.[2] The conventional Hilbert quadrature demodulation algorithm is improved. Theimproved algorithm enhances algorithm efficiency greatly.[3] The digital intermediate frequency receiver architecture of synthetic aperture radar isproposed based on four different digital receiver architectures. The appropriatesoftware and hardware design is implemented. The simulation and verification showthat the performance of digital receiver in synthetic aperture radar is better than that ofanalog receiver.[4] A digital radio frequency receiver theme with great flexibility is proposed.[5] The theory of software defined radio is introduced into synthetic aperture radar. The architecture of synthetic aperture radar based on software defined radio is analyzed andsuggested. The realization of the architecture is discussed.