返回散射扫频特殊电离图的信息提取  

A Method of Signal Extraction in Especial Backscatter Ionogram

作　　者：华彩成[1] 冯静[1] 李雪[1] 郭延波[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107

出　　处：《中国电子科学研究院学报》2015年第1期43-48,共6页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金青年科学基金项目(61302006);国防技术基础项目(JSJC2013210C054);国防技术基础项目(H312023D003)

摘　　要：根据返回散射电离图中噪声和干扰的时统特性提出了一套算法,用于特殊状态下(强底噪、D层吸收增强)的返回散射电离图有效信息的提取。算法首先利用频率域滤波技术,采用巴特沃斯低通滤波器对图像进行过滤处理,使得同频干扰信息得到抑制,然后利用矩形窗去噪和自适应中值滤波器对电离图进行去噪处理,并且对处理后的电离图进行补偿,得到了返回散射电离图干净有效的信号区域,并利用返回散射电离图频率和距离的相关性,将前沿描迹给出。结果显示,该算法对返回散射特殊电离图中的信号部分提取有较好的效果。According to the Timing of Noise and Co-channel interference in backscatter ionogram,a algorithm is proposed to extract effective message from ionogram in especial state（ strong background noise,the D layer enhancement of absorbency）. The algorithm utilizes the low-pass filter to process the ionogram in the frequency field to make the Co-channel interference message inhibited,and de-noises on rectangular window and adaptive median filter. The effective signal region of backscatter ionogram can be obtained with Compensating Methods for the ionogram. The frontal tracing curve is given according to the pertinence between distance and frequency. The results demonstrate the effectiveness of this algorithm in terms of obtaining the signal in especial ionogram.

关 键 词：频率域 巴特沃斯低通滤波器 自适应中值滤波器 前沿描迹 

分 类 号：TN011[电子电信—物理电子学]