相控阵雷达恒虚警性能研究

【作者】 李晓林；

【导师】 陈杰美；

【作者基本信息】 电子科技大学 ， 信号与信息系统， 2003， 硕士

【摘要】 本论文首先对我国某型号雷达中的MGO-CFAR检测器进行分析论证，重点分析了MGO-CFAR检测器在均匀背景杂波、多目标环境和杂波边缘环境中的性能。通过数学推导，得出了MGO-CFAR检测器在各种环境中的检测概率、虚警概率表达式，并用MATLAB编程，绘出了检测器的各种性能曲线。分析认为，MGO-CFAR检测器在均匀背景杂波中有着良好的检测能力，其检测能力只比CA-CFAR检测器有很小的损失。在杂波边缘环境中控制虚警能力优秀，远好于CA-CFAR检测器。但在多目标环境中的检测性能较差，当参考滑窗中有一个干扰目标时，MGO-CFAR的检测能力就已经严重下降。基于原来检测器的缺点，结合有序统计量概念，论文提出了MOSOS-CFAR检测器。MOSOS-CFAR检测器在前后滑窗分别采用有序统计量来表示前后滑窗的背景杂波功率水平，再将前后局部估计相加作为总的背景杂波功率水平估计。计算分析了MOSOS-CFAR检测器的各种性能，分析表明，MOSOS-CFAR检测器在均匀背景杂波中的检测性能良好，和MGO-CFAR检测器的检测性能相近；抗杂波边缘能力良好，但是略差于MGO-CFAR检测器；在多目标环境中的检测性能优秀，当干扰目标数少于R-k1-k2时，检测器的检测性能下降很少。更多还原

【Abstract】 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.更多还原