Research On BP Algorithm For Missile-Borne Bistatic SAR

Synthetic Aperture Radar (SAR), which has the characteristic of long range,all-weather and day/night can enhance radar’s information acquisition capability,especially the battlefield awarenceess ability,and has great value in both civilian and military applications, which undoubtedly is a radar guidance system represents a major breakthrough and innovation.Traditional single base SAR the transmitter and receiver are installed on the same platform, and shared a pair of antennae, therefore its image and vector direction of flight are inconsistent, so that they do not attack the target, which makes the SAR imaging technique and its application in missile guidance to certain restrictions. Therefore, in order to improve missile guidance accuracy, breaking the radar seeker prior to target areas depending on the imaging technology has become the need of resolving key issues. Monostatic Synthetic Aperture Radar (SAR) systems reach their limits if a two-dimensional resolution is desired for a forward-looking geometry, so they can not be used during the terminial phase of a missile engagement. Bistatic SAR systems offer an alternative to handle this problem, with the transmitter operates as a separated illuminator while the receiver is arranged in a forward-looking mode.The primary contributions of this dissertation,which is dovoted to the above aspects,are summarized as below:In this paper,the theory of forward-looking bistatic SAR imaging guided system is discussed in brief firstly.Then based on she mode with a bistatic geometry and the system parameters,it analyzes the characteristic of SAR echo,Doppler,resolution.After that.it analyzes the SPECAN imaging algorithm is applied to bistatic synthetic aperture radar guidance on the possibilities, including the basic principles of the algorithm, application conditions, implementation steps, and use optical image inversion simulate the actual radar echo data, complex targets on the ground imaging simulation, verification of the correctness of the algorithm SPECAN,This article discusses the classic time-domain imaging principle of BP algorithm and image processing steps and the use of an optical image inversion simulate the actual radar echo data, a target on the ground complex imaging simulation to verify the correctness of the BP algorithm. BP and SPECAN imaging algorithms and conducted a comprehensive analysis and comparison, in order for SAR images have broader application, the paper also discusses the SAR image geometric correction principle and implementation steps.Finally, this paper summarizes the work done, and made some follow-up to continue in-depth discussion.