Advance stagger scheduling of pulses in cognitive radar networks

Wang, H.; Liao, Kang; Ouyang, Shan; Bai, Zijian

doi:10.1049/icp.2021.0658

Cited by 2 publications

(1 citation statement)

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“…Scheduling has been applied to the mutual interference problem in radar networks [24], with the goal of reducing pulse collisions within a CRN. While this method was shown to be effective and feasible, it relies on pre-allocation of resources which can fail to perform optimally in a dynamic environment where the mean SINR in each channel can vary in time.…”

Section: Organizationmentioning

confidence: 99%

Hybrid Cognition for Target Tracking in Cognitive Radar Networks

Howard¹,

Buehrer²

2023

Preprint

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This work investigates online learning techniques for a cognitive radar network utilizing feedback from a central coordinator. The available spectrum is divided into channels, and each radar node must transmit in one channel per time step. The network attempts to optimize radar tracking accuracy by learning the optimal channel selection for spectrum sharing and radar performance. We define optimal selection for such a network in relation to the radar observation quality obtainable in a given channel. This is a difficult problem since the network must seek the optimal assignment from nodes to channels, rather than just seek the best overall channel. Since the presence of primary users appears as interference, the approach also improves spectrum sharing performance. In other words, maximizing radar performance also minimizes interference to primary users. Each node is able to learn the quality of several available channels through repeated sensing. We model the independent radar nodes as cognitive agents as well as the central coordinator and assume that information can be exchanged between the radars and the coordinator. Importantly, each part of the network acts as an online learner, observing the environment to inform future actions. We show that in interference-limited spectrum, where the signal-to-interference-plus-noise ratio can vary across channels and nodes, a cognitive radar network is able to use information from the central coordinator in order to reduce the amount of time necessary to learn the optimal channel selection. We also show that even limited use of a central coordinator can eliminate collisions, which occur when two nodes select the same channel. We provide several reward functions which capture different aspects of the dynamic radar scenario and describe the online machine learning algorithms which are applicable to this structure. In addition, we study varying levels of feedback, where central coordinator update rates vary. We compare our algorithms against baselines and demonstrate dramatic improvements in convergence time over the prior art. A network using hybrid

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Section: Organizationmentioning

confidence: 99%