CAJ | 학술논문

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。
위실현확빈대관대우도빈간격、간우신호강도교대급존재신도조성시직확/도빈( DS/FH )신호삼수정학고계，제출료일충결합도상처리산법여시빈분석기술적DS/FH신호삼수고계방법。해방법수선이용시빈분석산법제취DS/FH신호적시빈분포도，연후결합간우분량재시빈도중적도상특정，이용도상처리적개운산여폐운산척제료도상중적고립간우점급“공동”간우점。특별지，위억제복잡적모자간우신호제출료일충질대상관필배산법。최후통과분석도상상소위치여시빈삼수적대응관계완성DS/FH신호적삼수고계。방진실험표명，해방법가이유효소제간우신호적영향，준학쾌속제취혼합확빈신호적시빈삼수。
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 no-vel method is presented. The method combines the image processing algorithm and the time-frequency a-nalysis 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 pres-ented 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 e-liminate the influence of interference signals and estimate the time-frequency parameters of hybrid spread spectrum signal quickly and accurately.