Optimal CPI selection based on doppler spread and image contrast

Radar systems often allow for long dwell time on target. This can be achieved by using either wide beam antennas or by means of tracking systems. Long observation times are useful because they increase the probability to form effective Radar images. In fact, Radar images of non-cooperative moving targets strongly depend on the target's motions and often they are hard to interpret due to the particular image projection plane formed. Moreover, the image focus depends on the same motions. Therefore, it becomes essential to select a suitable time window in order to obtain an effective Radar image. This paper proposes a new technique for optimal time window selection. The proposed method is meant to combine different image quality parameters, namely Image Contrast (IC) and Doppler Spread (DS) and is tested by using real Radar data.