Uwb Sar System Design And Implementation

Ultra-Wideband-Synthetic-Aperture-Radar (UWB SAR) has been proven to be a significant contribution in the battlefield reconnaissance because of it's ability to penetrate the foliage and ground to detect the concealed targets. The purpose of this thesis is to present system designing framework for high resolution UWB SAR, which is detailed as following:1. UWB SAR system design considerations were performed. Chirp and Impulse waveform choices are examined. UWB Radar (UWBR) antenna is studied. The radar equation is developed to fit in with UWB SAR. The UWB SAR system parameters and its configuration are proposed.2. The UWBR system error compensation is studied. The Phase Stationary Principles (PSP) and the Paired Echo Principles (PEP) are firstly reviewed. The error tolerable levels and the error budget are secondly determined. System error model is introduced to analyze the effects of various error sources. A new method to compensate system error is proposed to actual UWBR system.3. Wide Angle (WB) SAR imaging algorithm is discussed. Range Migration Algorithm (RMA) and BackProjector Algorithm (BPA) are studied. A new experiment method, Bi-static SAR, to solve LFM radar range 'dead' area as well as its imaging algorithm are presented. The feasibility of the experiment method is confirmed by excellent experiment results. A interpolation method, which is widely used in WB SAR imaging, is proposed to improve the computing efficiency. The particularities of UWB/WB SAR are discussed at last.4. Motion compensation (MC) technique of UWB SAR is studied. Phase errors are mainly concern in UWB/WB SAR because they degrade image quality. Chapter 5 discusses phase errors and allocates the phase error budget, the motion accuracy of radar platform is proposed further. A rail UWB SAR system testbed is designed and constructed. The MC methods in rail-UWB SAR as well as airborne UWB SAR is introduced.