The High Resolution SAR Image Generating And Application In Target Identification

The Synthetic Aperture Radar (SAR) has broad application in ground target recognition. In normal, the SAR image varying with the observation angle or radar band width, as a result large number of SAR imaging under different condition was used for better identification. Due to the constraints of objective condition, acquisitions of so many SAR images is impossible, Simulated SAR image is one of the most important data source for target recognition. Thereby study of SAR image simulating under different condition have important realistic meaning.Based on the needing of SAR image identification, many simulating methods for SAR image were studied in this paper, and then the simulated images were applied in target recognition. The main content of this paper was concluded as following:(1) The paper studied the simulated SAR image produce technology based on rotating target mode. Firstly, the consistency between SAR imaging and rotate target imaging is analyzed. According to the characteristic of narrow angle mode and wide angle mode, different processing algorithm is analyzed. The data is simulated based on software Radbase. And the simulated SAR image is got under this scheme.(2) The paper modified the generalized coherent imaging algorithm. A imaging algorithm which can avoid the shading effect is proposed. And the problem of shading is solved by this way. The meaning of simulating SAR image is to supply data source for target recognition. But shading effect made the target SAR image is sensitive to the look angle. The paper used the modified coherent process to get the complete SAR image. Thus the image in the template base will be relative intact. So the sensitive to the angle can be reduced. The efficiency to create database will be improved.(3) Base on simulated SAR images coherence, a template database design scheme is proposed. The simulated SAR image could construct SAR image database, which was utilized for target recognition. First, the method about image detection and target recognition by simulated image was analyzed, based on which the scale of SAR image template database was studied, and the simulated method for optimal template database was proposed.In this paper, the SAR image generating method was studied in detail, which is important for target recognition based on SAR images. The study result is expected to serve in application of ground target recognition in future high resolution space borne SAR system, at least be of help for target recognition database construction.