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。
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.
出处
《电讯技术》
北大核心
2014年第8期1071-1076,共6页
Telecommunication Engineering
关键词
DS
FH信号
参数估计
图像处理
时频分析
DS/FH signal
parameter estimation
image processing
time-frequency analysis
