Bistatic Linear Array 3d Imaging Sar Technologies

"One-active"linear three-dimensional imaging synthetic aperture radar is a new system of SAR (SAR: Synthetic Aperture Radar) , which overcomes the shadow effect of the traditional two-dimensional imaging SAR system, and images the 3D (3D:three-dimensional) observed region, which suits for the 3D imaging of complex scene. Bistatic Synthetic Aperture Radar (BiSAR) system is a extension of the traditional monostatic SAR system. Comparing with the the traditional monostatic SAR system, it has such advantages : abundant infoumation of objective,long operating distance strong anti-interference and so on. The bistatic-based two linear arrays 3D imaging SAR extends the"one-active"linear 3D imaging SAR into the bistatic system,it inherits the merits of"one-active"linear 3D imaging SAR and BiSAR.Thus,it has a very important role in civil applications and military applications. It is a research focus of radar imaging domain.This paper mainly researches the imaging theories, imaging algorithms and the optimization of the antenna array of the bistatic-based two linear arrays 3D imaging SAR system. The main contents are as follows:1. First we introduce the echo model and basic imaging condition of the"one-active"linear array 3D imaging SAR system. Then introduce the echo model and fundamental mapping of the bistatic-based two linear arrays 3D imaging SAR system, and obtain the 3D imaging condition.2. We study the equivalence synthesis principle of MIMO array antenna base on the PCA and the Pattern of antenna; Research 3D imaging algorithms of the bistatic-based two linear arrays 3D imaging SAR system, and simulate with it to validate the feasibility of this system. Analyse the system resolutions of the bistatic-based two linear arrays 3D imaging SAR system and compare it with the other three-dimensional imaging Bistatic SAR systems.3. Found space ambiguity function of the bistatic-based two sparse linear arrays 3D imaging SAR system, and derive the cross-range 2-D ambiguity function (AF) when the antenna phase center track (APCT) is periodic function or random function base on the antenna phase center track affect the main-side lobe characteristics, and present the cross-range 2-D AF of some typical function, analyze the characteristics of mainlobe and sidelobe. Demonstrate the optimal antenna phase center track is quadratic distribution at minimum variance criteria.4. As the grating-lobe problem of the"one-active"linear array 3D imaging SAR system, we describe a method which uses anti-phase of symmetrical elements to decrease the grating-lobe, First we analyze of the grating-lobe problem of linear array antenna and obtain the conventional method to reduce the grating-lobe. Then describe the method and present the echo model, analyze the grating-lobe of this method and compare it with the"one-active"linear array 3D imaging SAR system, and simulate a scatterer to validate the feasibility of it. At last we derive the case that use multiple pairs of anti-phase of symmetrical elements.