基于时频重排-Hough变换的多分量Chirp信号的检测与参数估计  

Detection and Parameters Estimation for Multi-Component Chirps Based on Reassigned BTFD-Hough Transform

作　　者：于凤芹[1] 徐美华[2] 曹家麟[2] 

机构地区：[1]江南大学控制科学与工程研究中心,江苏无锡214122 [2]上海大学机械电子与自动化学院,上海200072

出　　处：《信号处理》2005年第6期585-588,共4页Journal of Signal Processing

基　　金：江苏省自然科学基金资助项目(项目编号:BK2002068)

摘　　要：针对BTFD-Hough算法因交叉项形成伪尖峰引起的误检测;而平滑交叉项又造成参数估计精度降低和运行 时间增加的问题,本文提出了对BTFD进行时频重排再结合Hougb变换的多分量Chirp信号检测与参数估计的改进方法, 仿真实验结果表明,该方法不仅有效地检测多分量Chirp信号并估计其参数,还降低了H0ugIl变换时间,同时也改善了抗 噪声性能。Because of the false detection resulted from the cross-term interference and the lower accuracy of parameter estimation and the increased time due to the decline time-frequency concentration for reducing the cross-term in BTFD-Hough transform, the improved method of the detection and parameters estimation for multi-component chirps is proposed in this paper, which by applying reassignment method to bilinear time-frequency distributions of the signal before thanking to the principal of the detecting the linear of Hough transform. The simulation results have showed that the method is not only of accurate estimation parameter and short execution time, but also good at reducing noise.

关 键 词：检测与参数估计 时频重排 HOUGH变换 双线性时频分布(BTFD) 多分量CHIRP信号 

分 类 号：TN911.23[电子电信—通信与信息系统] TP391.41[电子电信—信息与通信工程]