Technology And Algorithms Of Stratosphere Isar Platform Imaging On The Motion Object

With the development of signal processing technology and micro-electronics, the technology of radar is improving constantly, and radar is applied at many fields. The platform of radar is no longer restricted to ground-base, and is extended to high latitude space, such as airborne platform and satellite platform. However, with the increasing of demand for radar, the orbit of radar is becoming to scarce resources gradually, Stratosphere space provides good choice to solve the problem. Moreover, because of the unique environment character of stratosphere, the research of stratosphere radar platform is paid attention to by various countries’research institution, providing a new subject in radar imaging fields. In this paper, the critical technology and algorithm of stratosphere ISAR is studied, and the methods to solve the problems of stratosphere ISAR are proposed, the mainly tasks are as follow:1. The research of stratosphere ISAR imaging principle is accomplished. The stratosphere ISAR imaging model is set up, and ISAR rotate target model is derivated theoretically. Through theoretical analysis of rotate model, the range resolution and azimuth resolution is deduced, and the principle of radar imaging is grasped.2. Through the research of the rotate principle, the range alignment of RD imaging is discussed. The mainstream range alignment is analyzed theoretically, and the advantage of all kinds of algorithms is compared through simulation. 3. The imaging interference disturbed by the change of state and the separation of disturbed data are researched. The ISAR signal model is set up at the state of target motion state is changed, and through the analysis of echo data, the simple and practicable algorithm of getting rid of disturbed signal is proposed. Moreover, imaging effect of rejecting the disturbed data is showed by the simulation, proving the effectiveness.4. The stratosphere ISAR disturbing model is improved. Through the analysis of stratosphere environment, setting the radar signal parameter and establishing the stratosphere ISAR disturbing model. For the translational motion of platform, the platform translational speed is set based on the stratosphere atmosphere wind velocity. Through the theoretical analysis and simulation the effect for the imaging is verified.