Estimation Of Target Movement Parameters In Synthetic Aperture Radar

The publication presents a technique of detecting moving objects observed by a Synthetic Aperture Radar. Movement of the target introduces certain changes to the echo structure in SAR system. Those changes decrease SAR performance and in order to detect moving target correctly a two-dimensional Doppler filter should be applied. 2D Doppler techniques usually have high computational costs, which connected with large amount of data processed by SAR makes them difficult to implement it real-time systems. The authors propose to apply a simple 2D Doppler filter as a pre-processor and a source of an a priori information for further MTI processing. The technique of determining target´s movement parameters based on a phenomenon of Range Migration is also presented. The authors show, that movement of the target changes the range migration curves and the shape of the curve can be used to estimate the target velocity. The estimates can be used to match SAR processing to a target echo.