| 摘要: |
| 为实现扩频带宽大于跳频间隔、干扰信号强度较大及存在信道噪声时直扩/跳频（DS/FH）信号参数精确估计，提出了一种结合图像处理算法与时频分析技术的DS/FH信号参数估计方法。该方法首先利用时频分析算法提取DS/FH信号的时频分布图，然后结合干扰分量在时频图中的图像特征，利用图像处理的开运算与闭运算剔除了图像中的孤立干扰点及“空洞”干扰点。特别地，为抑制复杂的毛刺干扰信号提出了一种迭代相关匹配算法。最后通过分析图像像素位置与时频参数的对应关系完成DS/FH信号的参数估计。仿真实验表明，该方法可以有效消除干扰信号的影响，准确快速提取混合扩频信号的时频参数。 |
| 关键词: DS/FH信号 参数估计 图像处理 时频分析 |
| DOI： |
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| 基金项目: |
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| Parameters estimation of DS/FH signal based on image processing and time-frequency analysis |
| XI You-you,LI Zhi-gang,WANG Miao |
| () |
| Abstract: |
| The spread spectrum bandwidth of DS/FH(Direct Sequence/Frequency Hopping) signal to be estimated is greater than that of the FH interval,meanwhile，the energy of jamming signal and noise signal is greater than that of DS/FH signal.In order to estimate the parameters of DS/FH signal accurately, a novel method is presented. The method combines the image processing algorithm and the time-frequency analysis technology. First, it gets the time-frequency distribution of the DS/FH signal with time-frequency analysis; second, it removes the isolated points and the “hole” point with the closing operation and open operation of image processing algorithm. In particular, an iterative correlation matching algorithm is presented to restrain the burr interference. Finally, the parameter estimation is realized by analyzing the image pixel locations and time-frequency parameters. Simulation results show that the method can effectively eliminate the influence of interference signals and estimate the time-frequency parameters of hybrid spread spectrum signal quickly and accurately. |
| Key words: DS/FH signal parameter estimation image processing time-frequency analysis |
《电讯技术》编辑部 