Modified joint domain localized reduced-rank STAP

Among reduced-rank STAP methods, the joint domain localized (JDL) method is a relatively effective beam-Doppler domain method. However, there are two restrictions placed on this method which circumscribe its performance. One is that the transformation is equivalent to the 2D DFT, the other is that the target steering vector must be one column of the transformation. This paper points out that these two restrictions are not necessarily optimal cases, and presents a modified JDL method via changing the relative locations of each angle and Doppler in the transformation matrix. Simulation results demonstrate that these new structures are more data-efficient as well as more computationally efficient, and 4 channels can achieve similar performance to 9 channels in the original JDL method. Moreover, they are more tolerant to the non-ideal real environment