摘要
对接收到的跳频信号进行时频分析是跳频信号参数估计的重要步骤。利用重排方法对信号的时频谱图进行重排,有效地抑制了交叉干扰项,提高了信号的时频聚集性并且改善了信号时频谱图的可读性。对跳频信号的Gabor谱进行重排,能够在低信噪比条件下估计出跳频信号的跳频周期、跳变时刻和跳频频率等参数。仿真结果表明,与Gabor谱方法比较,采用重排Gabor谱方法对跳频信号进行分析,提高了跳频信号的跳频周期和跳变时刻估计的准确性。
It is an important approach to make time-frequency analysis of received FH signals in order to estimate the parameters of FH signals. The method of reassignment time-frequency spectrum reduces or completely removes the cross-terms and diffuses other signal components, enhances the time- frequency aggregation of the signals and improves the readability of time-frequency representation. With reassignment Gabor spectrum method of FH signals, the method can estimate its transmission parameters such as hop duration, hop timing and hopping frequency at low SNR. Simulation result shows that reassignment Gabor spectrum method of HF signals improves the accuracy of parameter estimation such as hop duration and hop timing compared with Gabor spectrum method.
出处
《电子信息对抗技术》
2009年第3期11-14,18,共5页
Electronic Information Warfare Technology
关键词
跳频信号
时频分析
重排
参数估计
frequency-hopping signals
time-frequency analysis
reassignment
parameter estimation
