摘要
Wigner-Ville分布对于单分量LFM信号有很好的时频聚集性,但WVD是二次型变换,故对信号环境中复杂的多LFM信号不可避免的存在交叉项的干扰。HT可以消除交叉项的影响,能够很好的对多个LFM信号进行检测,但存在大信号淹没小信号的现象。提出二值HT能够很好的解决上述问题,为多LFM信号的检测技术提供理论依据。
The Wigner-Ville Distribution has high time-frequency concentration and is usually used to detect LFM signal, but because it is bilinear, it brings cross terms when applied to multiple LFM signal, which degrades the performance of detection. Utilizing the property in the detecting lines of Hough transform, the Wigner-Hough transform can suppress the cross terms and estimate parameter of signals. When the signal diverge greatly, small signals are easily masked by the large signals, it is difficult to measure the signals at the same time. Here a method based on binary Hough Transform is proposed, which can avoid the problems of larger signals mask small signals and detect all signals with different energy at the same time. The simulated results show the method has good performance and high practical value.
出处
《舰船电子工程》
2009年第4期73-76,共4页
Ship Electronic Engineering
关键词
信号检测
线性调频
时频分布
霍夫变换
signal detection, linear frequency modulation, time-frequency distribution, Hough transform
