在当今信息化时代，通信、雷达等各种军用和民用电子设备的广泛应用，形成了时域高度密集、频域严重重叠、空域相互交织的复杂多变电磁环境，电子侦察机侦收时频混叠信号的概率显著提高。为了准确获取感兴趣的信号或发现重大干扰、威胁信号，对侦察机侦收的时频混叠信号进行分离，提取有用信号蕴含信息，成为电子侦察领域具有重要研究意义的项目。同时，单天线侦察机不仅可以降低设备造价，而且能够减小设备体积增强灵活性。在此背景下，本课题针对复杂电磁环境下单天线接收时频混叠信号的分离理论与方法展开研究。利用时频混叠信号在过采样后的时间结构信息，重点攻研单天线接收时频混叠信号的建模、分离和重构技术，突破现有多通道技术对时频混叠信号分离的限制，为侦察装备在实际的复杂电磁环境下对时频混叠信号的有效分离和信息获取提供理论基础和方法。

In nowadays information era, the types of communication or radar electronic equipment for both military and civilian applications are increasing significantly, which leads to various communication and radar signals overcrowded in time domain, overlapped in frequency domain and intertwined in space domain shaping a more complicated electromagnetic environment. As a result, the interception probability of time-frequency overlapped signals has been improved for electronic reconnaissance equipment. In order to accurately capture the interested signal or discover the interference signal, separating these time-frequency overlapped signals and extracting the information implied in the useful signal have become a research task with significant for electromagnetic surveillance domain. Meanwhile, the electronic reconnaissance equipment with single antenna not only reduced the cost but can reduce the equipment volume and improve its flexibility. Taking this background in to consideration, this project focuses on time-frequency overlapped signal separation theory and method research for single-antenna electronic reconnaissance in complex electromagnetic environment. Using the time structural information of the original time-frequency overlapping signals’ oversampling result, it will focus on modeling, identification and reconstruction technique for time-frequency overlapped signal from single antenna. So as to break through the limitation of existing multi-channel signal separation technique for time-frequency overlapped signals, and to provide effective separation and information capture theory and methods for time-frequency overlapped signals interpreted by reconnaissance equipment in actual complex electromagnetic environment.