CAJ | 학술논문

针时在相干积累期间发生距离走动的分布式目标检测问题,提出了一种广义似然算法及其改进算法.该算法采用广义似然函数准则与极大似然方法对不同预设速度下各个距离单元的信号进行估计,得到了两步广义似然比检测算子.进一步利用目标相邻强散射单元特性和相邻预设速度相关性,推导出改进的三步广义似然算法,随后证明了这两种算法的恒虚警率性.对两类飞机实测数据的多个实验结果表明,当目标发生距离走动的情况下,该算法性能相对与传统的非相干积累算法有明显提高.
침시재상간적루기간발생거리주동적분포식목표검측문제,제출료일충엄의사연산법급기개진산법.해산법채용엄의사연함수준칙여겁대사연방법대불동예설속도하각개거리단원적신호진행고계,득도료량보엄의사연비검측산자.진일보이용목표상린강산사단원특성화상린예설속도상관성,추도출개진적삼보엄의사연산법,수후증명료저량충산법적항허경솔성.대량류비궤실측수거적다개실험결과표명,당목표발생거리주동적정황하,해산법성능상대여전통적비상간적루산법유명현제고.
Two detection schemes for a spatially distributed range walking target during the coherent processing interval (CPI) are proposed.The first detector,two-step generalized likelihood rate test (2S-GLRT),is acquired by estimating the signal from every range cell at different given velocity with the generalized likelihood function(GLF) criterion and maximum likelihood (ML) method.Furthermore,the second detector,improved three-step generalized likelihood rate test (I3S-GLRT),is derived by utilizing the characteristic of strong scattering cells relevant to the target's scattering geometry and the correlation of adjacent given velocities.For both 2S-GLRT and I3S-GLRT,the detectors have the constant false alarm rate(CFAR).Finally,experimental results for measured data of two planes illustrate that the proposed algorithms achieve the visible performance improvement comparing with a conventional non-coherent integration algorithm in the presence of range walking.