Phased Array Lei Daheng False Alarm Performance Study

This paper first studies our nation's certain type of Radar's MGO-CFAR detector , mainly analyzing the detector's performance under homogeneous background, multiple targets situation and clutter edge situation. We derive the analytic expressions of false alarm probabilities and detection probabilities under various situations. Also, we drew the detector's various performance curves by using MATLAB. The result shows that the MGO-CFAR detector has good detection ability under homogenous background .The detection ability of the MGO-CFAR detector is only a little bit worse than that of the CA-CFAR detector. But its detection performance is not so good under multiple targets situation. The MGO-CFAR detector's detection performance degrades dramatically when there is one interfering target in the reference window. Taking account of the concept of ordered statistics, this paper presents MOSOS-CFAR detector for avoiding the original detector's flaws. In the forth and back windows ,the MOSOS-CFAR detector uses the ordered statistics as the background cutter power level of the two windows, and the sum of the forth and back local estimation as the total estimation of background clutter power level. the various performance of the MOSOS-CFAR detector was analyzed. The result shows that the MOSOS-CFAR detector has good performance under the homogenous background, almost the same as that of the MGO-CFAR detector; good performance against clutter edge, excellent performance under multiple targets situation, the detector's detection performance dropped not much when the interfering target is less than R-k1-k2.