利用匹配追踪算法提取变电站内路径损耗参数

Extracting Path Loss Parameters in Substation by Using Matching Pursuit Algorithm

为了衡量变电站内电磁环境对无线通信设备的干扰,尤其是对无线信道的干扰,采用频域测量方法在110 k V和220 k V变电站内分别对430 MHz和470 MHz通信频段电磁波路径损耗进行了测量。针对变电站内电磁环境相对复杂的情况,提出了一种利用匹配追踪算法滤除噪声,提取路径损耗参数的方法。根据测量信号的特征,构建了与测量信号匹配而对噪声不敏感的高斯脉冲原子库。与常规的Gabor原子库相比,基于构建的高斯脉冲原子库的匹配追踪算法比传统的基于Gabor原子库的匹配追踪算法运算速度要快3~4倍,提高了匹配追踪算法的运算速度,减少了计算时间,获得了较好的降噪和信息提取的效果,为变电站内布置无线通信设备提供了理论依据和指导意义。

In order to evaluate the interference of electromagnetic environment to the wireless communica-tion equipment in the substation,especially to wireless channel,the frequency domain method is used to measure the electromagnetic wave path loss of 430 MHz and 470 MHz in the 110 kV and 220 kV substation respectively. For the condition that the electromagnetic environment of substation is complex relatively, a method is proposed to eliminate noise and extract the path loss parameters based on matching pursuit（MP） algorithm. According to the characteristics of the test signal,Gauss pulse atomic library is constructed, which matches with test signal and is not sensitive to noise. Compared with Gabor atomic l ib ra ry,the speed of matching pursuit algorithm based on Gauss pulse atomic library is faster than that of the MP algorithm based on Gabor atomic library three to four times. The Gauss pulse atomic library improves the calculation speed of MP algorithm and reduces the computing time. The MP algorithm gets a good effect of information extraction and noise elimination,which provides a theoretical basis and guidance for the wireless communi-cation equipment placed in the substaion.