分析了在均匀杂波回波功率服从 Gamma分布条件下 SAR点目标检测 ,推导了点目标虚警概率和检测概率与阈值系数关系 ,提出了检测点目标阈值系数选择根据和方法。在杂波均值估计方面 ,提出了以全局均值代替局部动态均值。实际测试结果表明所提出的检测方法在检测效果和计算量方面都优于双参数恒虚警检测算法 The detection of SAR point target under the condition that the uniform clutter echo power is subject to Gamma distribution is analyzed. The relationship between the point-target false alarm probability and the detection probability and the threshold coefficient is deduced. The basis and method of threshold selection of the target point of the detection point are proposed. In the aspect of clutter average estimation, a global average is proposed to replace local dynamic mean. The actual test results show that the proposed detection method is superior to the two-parameter CFAR detection algorithm