2019 Volume 8 Issue 2 Pages 32-37
Space Time Adaptive processing (STAP) has been proposed to suppress the clutter in the airborne radar. In STAP covariance matrix of the received signal is employed to carry out the processing. This is often estimated by making use of returns from neighboring range bins of interest. In many simulation results, independent and identically distributed (IID) samples are assumed for the clutter. It is said that the more samples we consider in sample covariance matrix, the better signal-to-interference plus noise ratio (SINR) is achieved in STAP. However, we have found the optimum sample size to achieve maximum SINR in real circumstance. In this paper, we discuss the violation of IID assumption resulting in degradation of SINR using real sea clutter data observed by S-band side-looking airborne radar. The existence of the optimum samples is shown here.