摘要
针对复线性调频信号在多径条件下的循环相关检测问题进行研究。利用循环平稳信号的循环相关特性,分析了多径条件下复线性调频信号的循环相关特性,在此基础上从连续和离散两方面构造了基于循环自相关包络的检测统计量,然后分析了检测性能,推导了检测统计量的输出信噪比表达式,从中可看出输出信噪比较输入信噪比和单径条件下的输出信噪比都有了较大提高。最后采用计算机从输出信噪比和虚警概率两方面进行了仿真,得到了基于循环自相关包络检测统计量的检测性能曲线,仿真试验验证了本文的结论。
The problem of detecting the complex linear frequency modulation （LFM） in multipath based on cyclic correlation is discussed. The cyclic statistics of the complex LFM is analyzed, and the detector based on the cyclic correlation amplitude is constructed using the continuous and discrete signals. The detector properties are then analyzed and the output signalnoise ratio （SNR） of the detector is deduced, The result shows that the output SNR is higher than both the input SNR and the single-path output SNR. Finally, the character ofthe detector is obtained from the output SNR and the probability of false alarm through the computer simulation. The simulation is in agreement with the analytic results.
出处
《数据采集与处理》
CSCD
北大核心
2006年第2期193-197,共5页
Journal of Data Acquisition and Processing
关键词
循环相关
线性调频
多径
检测
cyclic correlation
linear frequency-modulated
multipath
detection
