Abstract:

Under homogeneous and heterogeneous environments, the VI-CFAR detector is outstanding and robust on the detection performance and the control ability of false alarm. However, the detection performance of the VI-CFAR degrades extremely if the interfering targets are not confined to a single half of the reference windows. To overcome this problem, the paper presents an improved MVICFAR detector, which replaces the SOCFAR by the OSCACFAR and the OSSOCFAR. It can solve both the interfering target occurring randomly in the reference windows and the number of interfering targets exceeding the maximum numbers of resisting interfering targets in a single half of the reference windows. In this paper, we also analyze the variation characteristics of the statistic VI under the different number of interfering targets and under the different signalnoise rate. The analysis is helpful to design and assess the maximum number of resisting interfering targets in VItype CFAR detectors. The simulation results show that the MVICFAR is more robust under multitargets environments and its processing time is only half of the other improved VICFAR detectors.

Key words: constant false alarm rate detection;variability index;ordered statistic VI;improved VI;modified VI;homogeneous environments;nonhomogeneous environments