摘要
为提高混响限制下检测器的宽容性,采用理论分析和实验研究了一种基于随机时间扩展失真(TSD)对信道建模的方法.分析了基于该模型对信道建模来修正介质传播造成的影响,根据广义似然比检测(GLRT)准则推出的一种最优检测器——分段拷贝相关积分器(RCI).采用线性调频(LFM)发射信号通过仿真以及对实际数据的处理对分析结果进行了验证.研究结果表明:在混响限制条件下,采用TSD对信道建模,RCI检测器可以提高混响背景下主动声纳的检测性能.研究结论为水下失真信道中信号检测问题的解决提供一个有效途径.
In order to improve detection performance in reverberation, this study concentrated on the approach that based on modeling the channel distortion as random time spreading distortion （TSD）. The influence on revising medium propagating under this model is analysised. The generalized likelihood ratio test （GLRT） yields a optimal detector. This detector is the replica correlation integration （RCI） dectector, which incoherently averages after replica correlation. This study used the numerical simulations and experimentations based on linear frequency modulated （LFM） signal to demonstrate the accuracy of the analysis. The result shows that the RCI detector can improve detection performance in reverberation when the channel distortion is modeled as TSD. The research conclusion provides an effective way for distortion channel signal detection in shallow water.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2013年第6期807-812,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(11176031)
西南科技大学青年科研基金资助项目(07zx3105)
