Bistatic Sar Imaging Software Based On Idl Design And Realization

Bistatic Synthetic Aperture Radar is a kind of new radar system, its transmitter and receiver are installed on different platforms, with the advantages of operating long range, the security, anti-interference and anti-interception, is paid more and more attention to by various countries. However, in our country, the application of bistatic SAR data, imaging processing and analysis of data visualization are still at a relatively low level. The representative of the fourth generation of visual languages IDL is utilized to develop a kind of imaging software for bistatic SAR, which can imaging and visual analysis to the data of bistatic SAR, there is a very obvious meaning to domestic bistatic SAR research and application of IDL in bistatic SAR field. The main work of this paper is as follows:First of all, the mechanism and algorithm of imaging of bistatic SAR are correspondingly researched and analyzed, which is regarded as the base of imaging software development. In mechanism of imaging, the geometry models and the echo models of the bistatic SAR are set up under wanton flight mode at first; range history, the characteristic of Doppler and the characteristic of spatial resolution are analyzed in detail. In algorithm of imaging, the bistatic RD and BP algorithm are studied under Translationally Invariant mode, provide the principles of two kinds of algorithms, and provide two Doppler parameters estimation methods for RD algorithm: the principle of the greatest contrast and based on minimum entropy algorithm for the Discrete Fourier algorithm.Secondly, the research on the mechanism and algorithm of bistatic imaging SAR is regarded as the foundation, the function demand of imaging software is analyzed and confirmed. Direct against the function demand for the software, the overall frame of the software is designed, and the five major function module are separately designed with combination of the characteristic of IDL, and they are Encrypt and guide module, import module, top management module , data processing module and export module. To utilize the methods of the GUI design and data input, Encrypt and guide module, import module and top management module are provided with the concrete design plan; Combining the theory and algorithm of bistatic SAR and the characteristic of data processing of IDL, the generating program of the emulation data have been improved, the data processing procedure of RD algorithm and BP algorithm is also afforded; finally the export module is finished to utilize the object graphic system of IDL, including the design of imaging display system, image process system , data acquisition and analysis system and data reservation system.Finally, each chief function of imaging software are realized and has been shown through the concrete examples. The function realized includes: to utilize RD algorithm and BP algorithm to carry on theory emulation and imaging based on measured data under Translationally Invariant mode, debug every algorithm step by step and display results, data processing and data analysis.