广播卫星电视接收机对SMAP卫星L波段微波辐射计的射频干扰特征分析

该文通过融合SMAP卫星L波段交叉极化亮温，建立基于密度和强度空间分布特征的多重迭代聚类射频干扰(RFI)检测识别算法。分析并提取日本典型RFI源(广播卫星电视接收机)密度和累积强度的时空分布和变化特征。电视接收机作为典型的RFI源，主要分布在日本城市化水平和范围均相对较大的区域(条状或面状)，局部区域内分布点圆状RFI(可能为微波辐射基站)，导致局地化RFI累积强度具有很高的水平。同时，在日本其他区域也检测到独立分布的点圆状RFI，干扰强度和范围相对局限。2018年开始，日本RFI整体分布范围和强度能级呈下降趋势。典型RFI源特征分析对于我国建立RFI检测、识别及抑制模型具有重要意义。

Analysis of RF Interference Characteristics of Broadcasting Satellite TV Receivers to SMAP Satellite L-Band Microwave Radiometer

Based on the fusion of SMAP satellite L-band cross-polarized brightness temperature, a multi-iteration clustering Radio Frequency Interference (RFI) detection and recognition algorithm based on its spatial distribution of density and intensity is established, and the spatial and temporal distribution and variation characteristics of the density and cumulative intensity of typical Japanese RFI sources (broadcast satellite TV receivers) are analyzed and extracted. As a typical RFI source, TV receivers are mainly distributed in areas with relatively large urbanization level and range (stripes or planes), with dotted RFI sources (possibly microwave radiation base stations) distributed in local areas, resulting in local areas with high RFI levels. In other areas where the urbanization level and scope are relatively small, the dot-round RFI sources are also detected, but the interference intensity and range are relatively limited. Beginning in 2018, the overall RFI distribution range and intensity level showed a downward trend. This work is of great significance to the establishment of RFI detection, identification and suppression models in China.