Joint Waveform and Receiver Design for Co-Channel Hybrid Active-Passive Sensing With Timing Uncertainty
Joint Waveform and Receiver Design for Co-Channel Hybrid Active-Passive Sensing With Timing Uncertainty
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DOI：
10.1109/tsp.2020.2964194
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发表时间：
2019-08
影响因子：
5.4
通讯作者：
Fangzhou Wang;Hongbin Li
中科院分区：
文献类型：
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作者：
Fangzhou Wang;Hongbin Li
我们考虑一个混合有源-无源雷达系统，采用无线源作为无源照射器的机会（IO）和同信道有源雷达发射机在同一频带工作，以寻求频谱效率。混合系统可以利用无源雷达的优势（例如，能量效率、双/多基地配置和空间分集）以及有源雷达的那些（专用发射机、灵活的发射波束操纵、针对感测优化的波形等）。为了减轻雷达和通信信号之间的相互干扰和位置引起的定时不确定性，我们提出了两种设计的雷达波形和接收滤波器的联合优化。第一个是最大-最小（MM）准则，其在定时不确定性间隔上优化最坏情况的性能度量，并且另一个是加权和（WS）准则，其形成延迟不确定性间隔内的每个延迟处的性能度量的加权和。这两个设计标准的结果在非凸约束优化问题，解决了顺序凸规划方法。当定时不确定性消失时，这两种设计变得相同，并允许更简单的解决方案。数值结果表明，所提出的混合计划的性能与传统的有源和无源雷达系统相比。
We consider a hybrid active-passive radar system that employs a wireless source as a passive illuminator of opportunity (IO) and a co-channel active radar transmitter operating in the same frequency band to seek spectral efficiency. The hybrid system can take advantage of the strengths of passive radar (e.g., energy efficiency, bi-/multi-static configuration, and spatial diversity) as well as those of active radar (dedicated transmitter, flexible transmit beam steering, waveform optimized for sensing, etc.). To mitigate the mutual interference and location-induced timing uncertainty between the radar and communication signals, we propose two designs for the joint optimization of the radar waveform and receive filters. The first is a max-min (MM) criterion that optimizes a worst-case performance metric over a timing uncertainty interval, and the other a weighted-sum (WS) criterion that forms a weighted sum of the performance metric at each delay within the delay uncertainty interval. Both design criteria result in nonconvex constrained optimization problems that are solved by sequential convex programming methods. When timing uncertainty vanishes, the two designs become identical and admit a simpler solution. Numerical results are presented to demonstrate the performance of the proposed hybrid schemes in comparison with conventional active-only and passive-only radar systems.