Clutter Identification based on sparse recovery with dynamically changing dictionary sizes for cognitive radar

Yuansheng Zhu; Yijian Xiang; Satyabrata Sen; Ervin Sejdic; Arye Nehorai; Murat Akcakaya

doi:10.1117/12.2520154

13 May 2019 Clutter Identification based on sparse recovery with dynamically changing dictionary sizes for cognitive radar

Yuansheng Zhu, Yijian Xiang, Satyabrata Sen, Ervin Sejdic, Arye Nehorai, Murat Akcakaya

Author Affiliations +

Proceedings Volume 10989, Big Data: Learning, Analytics, and Applications; 109890L (2019) https://doi.org/10.1117/12.2520154
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

Existing radar algorithms assume stationary statistical characteristics for environment/clutter. In practical scenarios, the statistical characteristics of the clutter can dynamically change depending on where the radar is operating. Non-stationarity in the statistical characteristics of the clutter may negatively affect the radar performance. Cognitive radar that can sense the changes in the clutter statistics, learn the new statistical characteristics, and adapt to these changes has been proposed to overcome these shortcomings. We have recently developed techniques for detection of statistical changes and learning the new clutter distribution for cognitive radar. In this work, we will extend the learning component. More specifically, in our previous work, we have developed a sparse recovery based clutter distribution identification to learn the distribution of the new clutter characteristics after the detected change in the statistics of the clutter. In our method, we have built a dictionary of clutter distributions and used this dictionary in orthogonal matching pursuit to perform sparse recovery of the clutter distribution assuming that the dictionary includes the new distribution. In this work, we propose a hypothesis testing based approach to detect whether the new distribution of the clutter is included in the dictionary or not, and suggest a method to dynamically update the dictionary. We envision that the successful outcomes of this work will be of high relevance to the adaptive learning and cognitive augmentation of the radar systems that are used in remotely piloted vehicles for surveillance and reconnaissance operations.

Conference Presentation

Citation Download Citation

Yuansheng Zhu, Yijian Xiang, Satyabrata Sen, Ervin Sejdic, Arye Nehorai, and Murat Akcakaya "Clutter Identification based on sparse recovery with dynamically changing dictionary sizes for cognitive radar", Proc. SPIE 10989, Big Data: Learning, Analytics, and Applications, 109890L (13 May 2019); https://doi.org/10.1117/12.2520154

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