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中文摘要：
针对距离扩展目标所占据的各距离单元输出的信杂比在统计意义上不同的一般情况,在分析基于顺序统计的广义似然比检测（generalized likelihood ratio test based on order statistics,OS-GLRT）的基础上提出了两种改进的检测器。第一种是修正的OS-GLRT,它采用或规则,将所有可能的有效距离单元数量得到的OS-GLRT的结果进行融合后做出判决,所得到的修正的OS-GLRT无需有效距离单元数量等目标先验信息。第二种是结合双门限（dual threshold,DH）技术,通过设置固定的第一门限对有效距离单元数目进行估计,动态的第二门限形成最终的判决。与同类检测器相比,新检测器不需要距离扩展目标的先验信息,具有较好的鲁棒性。
英文摘要：
Aiming at the difference existing at each statistical range cells＇ output signal to clutter ratio,the range-spread target detection method based on range-cell-selecting is investigated.Firstly,the generalized likelihood ratio test based on order statistics（OS-GLRT） is analysed,then two kinds of modified range-cell-selecting detectors based on OS-GLRT are proposed.The first one adopts the rule of OR and fuses the decision results of all OS-GLRT to make a final decision,where the OS-GLRT includes all assumptions about the number of valid range cells.The modified OS-GLRT does not need any information about the number of valid range cells of range-spread targets.The second one is based on dual threshold（DH） technique,which uses a fixed primitive threshold to estimate the number of valid range cells and a dynamic secondary threshold to judge.Compared with the common detectors,the novel detectors need not know any prior information on range-spread targets and they are much more robust.
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