基于频率分集-MIMO体制的高速平台雷达动目标检测关键技术研究

The moving target detection of high-speed platform radar has important application value in national defense and national economy areas. However, when the radar works in looking-down mode, the problem of non-stationary clutter with range ambiguity, the problem of range migration, Doppler migration and angle migration of the clutter and the problem of electromagnetic jamming will arise, which make the clutter suppression and target detection performance deteriorate rapidly. By using the frequency diversity MIMO system, the targets, the deceptive jamming or the clutter with different ranges will have different receiving frequencies and transmitting frequencies, which is very helpful for separation of range ambiguity signal and suppression of deceptive jamming. In addition, the frequency diversity MIMO system can also deal with the problem of beam crossing, and can realize unambiguous parameter estimation with single pulse repetition frequency. Therefore, it is of great significance to carry out related theoretical research. This project focuses on the key issues in the signal processing of moving target detection for high-speed platform frequency diversity MIMO radar, including the problem of waveform design, the problem of non-stationary 3D range ambiguity clutter suppression with range and velocity walking, the problem of clutter suppression with dimensional reduction and the problem of active electromagnetic jamming suppression. This project will lay the foundation of theory and algorithms for moving target detection of high-speed platform frequency diversity MIMO radar.

高速平台雷达运动目标检测技术在国防和国民经济建设中具有重要应用价值。但雷达下视工作会面临距离模糊非平稳杂波问题、杂波距离走动、多普勒走动和角度走动问题以及电磁干扰问题，从而使杂波抑制和目标检测性能急剧恶化。通过采用频率分集-MIMO体制，不同距离的目标、欺骗干扰和杂波具有不同的收、发空间频率，该特性非常有利于高速平台雷达距离模糊信号的分离和欺骗干扰的抑制。此外，频率分集-MIMO体制还可解决目标波束跨越问题，并可在单一重频下实现无模糊目标参数估计。因此开展相关理论研究具有重要意义。本课题将围绕高速平台频率分集-MIMO雷达动目标检测在信号处理方面的关键问题，开展相应的波形设计方法研究、存在距离和速度走动的距离模糊非平稳三维杂波抑制及其降维方法研究、有源电磁干扰抑制方法研究，为高速平台频率分集-MIMO雷达动目标检测奠定理论和算法基础。

高速平台雷达运动目标检测技术在国防和国民经济建设中具有重要应用价值。但雷达下视工作会面临距离模糊非平稳杂波问题、杂波距离走动、多普勒走动和角度走动问题以及电磁干扰问题，从而使杂波抑制和目标检测性能急剧恶化。通过采用频率分集-MIMO体制，不同距离的目标、欺骗干扰和杂波具有不同的收、发空间频率，该特性非常有利于高速平台雷达距离模糊信号的分离和欺骗干扰的抑制。此外，频率分集-MIMO体制还可解决目标波束跨越问题，并可在单一重频下实现无模糊目标参数估计。因此开展相关理论研究具有重要意义。本课题围绕高速平台频率分集-MIMO雷达动目标检测在信号处理方面的关键问题，突破了相应的波形设计、存在距离和速度走动的距离模糊非平稳三维杂波抑制、以及有源电磁干扰抑制等关键技术，为高速平台频率分集-MIMO雷达动目标检测奠定了理论和算法基础。