短波复杂信道下跳频信号的参数估计  

Parameter Estimation of Frequency Hopping Signals Under Complex High Frequency Channels

作　　者：李琰[1] 王露[1] 李天昀[1] 葛临东[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《信息工程大学学报》2011年第2期168-173,共6页Journal of Information Engineering University

摘　　要：提出一种可以有效克服短波复杂信道环境影响的高精度跳频信号参数估计方法。首先使用短时傅里叶变换(STFT)做信号的时频谱图,并通过图像处理方法对谱图进行预处理;然后提取谱图的时频脊线,用形态学平滑消除时频脊线的畸变,通过一阶差分获得跳变位置;结合信号的时域信息精确估计跳变点位置,完成信号整体跳变定时;最后在信号整体跳变定时的基础上,对信号逐跳进行定时调整和精确测频。实验结果表明该方法切实有效,计算量小,参数估计精度高。This paper Proposes a high accuracy parameter estimation method,which can be applied to the complex high frequency environment.Firstly,Short Time Fourier Transform（STFT） is used to derive the time-frequency spectrograph,which is pre-treated with image processing techniques.Then the time-frequency backbone curve of the spectrograph is extracted,the distortion of which is eliminated by introducing the mathematic morphology smooth techniques,while the jump position is acquired through first order difference.Finally,combining the time domain information of the signal,the jump sample is precisely estimated,and the hop timing is acquired,based on which the each-hop timing adjustment and precise frequency estimation are finished.Experimental results show that the proposed method is effective with low complexity and high accuracy.

关 键 词：短波 跳频 参数估计 形态学 

分 类 号：TN911.23[电子电信—通信与信息系统]