Ground-based Synthetic Aperture Radar System, Data Acquisition And Control

Synthetic aperture radar, SAR for short, means the imaging pattern of radar moving and target by imaging put. It uses small aperture antenna transmitting and receiving wide-band microwave signal, and synthesizes large antenna aperture by special diversity which can gain high range and cross-range resolution. As initiative radar, SAR has the characteristics of immune to illumination and weather changing, which can all weather and all time observe and gain information penetrate through the earth's surface and vegetation. This dissertation, based on scientific research item, is focused on the ground SAR system. The main contributions are as follows,(1)Join in designing and implementing a set of synthetic aperture microwave imaging system in X band with stepped frequency continuous wave to realize high range resolution and high azimuth resolution based on synthetic large aperture by system moving on track. The imaging system can be applied to the imaging of outdoor full-size target.(2)Design and implement a system controlling card and a data collecting card in the system. The two card assort with each other and successful finish a lot of work such as: data collecting, locomotion controlling, frequency controlling and so on.(3) In this paper, the problem of carrier feed-through in continuous wave system which limits the detection range of the radar system is analyzed in detail. The active method of feed-through nulling in continuous wave radar systems is investigated theoretically . By experiment, we get better result and system performance.