The Key Technologies For Synthetic Aperture Radar Study

Synthetic Aperture Ladar (SAL) is a kind of imaging laser radar utilizing synthetic aperture techniques to obtain high resolution image without the installation of large optics. Compared with Synthetic Aperture Radar (SAR) using microwave as radiating source, SAL can achieve dramatic improvement in both resolution and time to record an image due to its shorter radiative wavelength.SAL is a new type of radar systems with the synthetic aperture radar and laser radar technology, The research in this field is still in the initial stage at home and abroad,This thesis gives a preliminary study on the basic imaging principle of vertical side-looking strip-mode SAL. In vertical side-looking strip-mode SAL, only the azimuth resolution of output images results from aperture synthesis, while the range resolution is obtained by pulse compression techniques. In this thesis, the structure of the overall system be analyzed and designed, the main components be alternated, at the same time ,the main parameters of the system be calculated, and access to the basic principles of imaging and imaging algorithm. Vertical side-looking strip-mode SAL adopts deramp compression and azimuth matched filter imaging algorithm. Based on the theory and imaging algorithm obtained, imaging performance of dot targets is simulated numerically by means of Matlab software for this mode SAL's. Moreover, the imaging characteristics of this mode SAL's systems are presented. the key techniques in developing a practical SAL system are also discussed briefly.The work in this thesis will paved the way for the researches of SAL development both theoretically and experimentally. Although there probably exist some technical difficulties in developing a SAL system for long range application at present, experimental imaging SAL systems will be implemented in the near future.