On the recognition of compromise in sensing systems: rewired acoustic arrays and distorted route estimation and classification

摘要

A group of acoustic arrays that provide direction of approach estimates also supports classification of vehicles using the beams formed during that estimation. Successful simultaneous tracking and classification has demonstrated the value of such a sensing resource as an unattended ground sensor (UGS) installation. We now consider potential attacks on the integrity of such an installation, describing the effect of compromised acoustic arrays in the data analysis and tracking and classification results. We indicate how these can be automatically recognized, and note that calibration methods intended for deployment time can be used for recovery during operation, which opens the door to methods for recovery from the compromise without re-configuring the equipment, using abductive reasoning to discover the necessary re-processing structure.rnBy rotating an acoustic array, the tracking stability and implied path of an entity can be distorted while leaving the data and analysis from individual arrays self-consistent. Less structured modifications such as exchanging microphone connections impact the basic data analysis. We examine the effect of these classes of attack on the integrity of a set of unattended acoustic arrays, and consider the steps necessary for detection, diagnosis, and recovering an effective sensing system. Understaning these steps plays an important part in reasoning in support of balance of investment, planning, operation and post-hoc analysis.