基于极化及时频特征的辐射计射频干扰检测方法研究

项目名称： 基于极化及时频特征的辐射计射频干扰检测方法研究

项目编号： No.61501234

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 吴礼

作者单位： 南京理工大学

项目金额： 21万元

中文摘要： 辐射计在被动遥感、公共安全等领域有着广泛应用，但在复杂电磁环境下其易遭受射频干扰，降低了辐射计的测量精度，甚至威胁到辐射计系统的正常工作。针对这一问题，本项目首先对辐射计射频干扰作用机理进行研究，建立信号系统模型，研究干扰信号极化特征表征方法，确定干扰功率与亮温贡献之间对应关系。开展基于极化特征的辐射计射频干扰检测方法研究，主要包括典型目标极化辐射传输模型、干扰信号的极化特性分析及基于干扰、目标极化特征差异的射频干扰检测方法研究。开展基于时频特征的辐射计射频干扰检测方法研究，优化时频分析算法参数，提取信号时频特征并设计判断准则以实现射频干扰检测。分析这两种辐射计射频干扰检测方法性能并完成干扰检测方法实验验证。预期研究成果将突破现有检测方法的局限性，提高辐射计射频干扰的检测性能，为辐射计射频干扰检测新方法研究及辐射计新体制设计提供新的思路和途径。

中文关键词： 辐射计；射频干扰；极化；时频分析；辐射特性

英文摘要： The radiometer has been applied in the wide fields like passive remote sensing, public security, but it is susceptible to be interrupted by the radio frequency interference in the harsh electromagnetic environment, which could deteriorate the measurement accuracy. In the worst case, the radiometer cannot even work normally. In view of the problem, this project studies the mechanism of radiometer radio frequency interference which involves building the signal system models, polarization characteristics representation, and determination of the contribution to radiometer brightness temperature caused by interference power. Also this project studies the radiometer radio frequency interference detection method based on polarization characteristics, including the polarized radiative transfer model of typical targets, polarization characteristics of interference and detection methods based on the polarization difference between the radio frequency interference and targets. The research also investigates the radio frequency interference detection method based on signal time-frequency characteristics, which is concerned about time-frequency analysis algorithm optimization, features extraction, and criterion design to implement the radio frequency interference detection. The performances of the both radiometer radio frequency interference detection methods are analyzed and verified by experiments. The research is expected to break through the limitations of current single detection method and improve the detection performance of the radiometer radio frequency interference. Also it can provide new ideas and references for the research of radiometer radio frequency interference detection methods and radiometer system design.

英文关键词： Radiometer ;Radio Frequency Interference Detection;Polarization;Time-Frequency Analysis;Radiation Characteristics