Sensor Control for Information Gain in Dynamic, Sparse and Partially Observed Environments
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We present an approach for autonomous sensor control for information gathering under partially observable, dynamic and sparsely sampled environments. We consider the problem of controlling a sensor that makes partial observations in some space of interest such that it maximizes information about entities present in that space. We describe our approach for the task of Radio-Frequency (RF) spectrum monitoring, where the goal is to search for and track unknown, dynamic signals in the environment. To this end, we develop and demonstrate enhancements of the Deep Anticipatory Network (DAN) Reinforcement Learning (RL) framework that uses prediction and information-gain rewards to learn information-maximization policies in reward-sparse environments. We also extend this problem to situations in which taking samples from the actual RF spectrum/field is limited and expensive, and propose a model-based version of the original RL algorithm that fine-tunes the controller using a model of the environment that is iteratively improved from limited samples taken from the RF field. Our approach was thoroughly validated by testing against baseline expert-designed controllers in simulated RF environments of different complexity, using different rewards schemes and evaluation metrics. The results show that our system outperforms the standard DAN architecture and is more flexible and robust than several hand-coded agents. We also show that our approach is adaptable to non-stationary environments where the agent has to learn to adapt to changes from the emitting sources.
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