DMSS 2018 Abstracts

Full Papers
Paper Nr: 1

A Set of Optimal Looks on a Symmetric Target


Bao Nguyen

Abstract: In this paper, we identify a set of multiple looks from symmetry that optimize the expected probability of detection in a mine hunting operation or in a search & rescue mission. We assume that the target exhibits mirror symmetry, i.e., that the left hand side of a target is the mirror image of the right hand side of the same target. In addition, it is assumed that the cross section is maximal at the interface between the left hand side and the right hand side and decreases monotonically as we move away from the interface. The optimal strategy consists of choosing aspect angles to inspect a target to ensure that the probability of detection is maximal. This is generally an NP-hard problem in the sense that to find the optimal angles in n dimensions normally consumes a lot of computational power. Fortunately, in this problem, we are use a novel combination of variational calculus and symmetry principles to determine analytically the locally optimal angles. The solutions will help the operators plan for an effective strategy in a mine hunting operation or in a search and rescue mission. Such a strategy is robust as most targets of interest possess approximate mirror symmetry along one or more axes. For example, a human body or a canoe or a mine when cut in half yield approximately such symmetry.

Paper Nr: 2

Non-autonomous Area Coverage and Coordination of a Multi-agent System for Harbor Protection Applications


Suruz Miah, Bao Nguyen, Alex Bourque and Davide Spinello

Abstract: We propose optimal strategies to develop an automated layered defence system for protecting structured environments, illustrated here by a typical harbor. The harbor is modeled as a two-dimensional environment, with a cooperative set of autonomous mobile agents to be deployed as the defence system. Optimal deployment is measured in a well-known area coverage metric, that encodes agents’ sensing performance and a weight measure defined on the harbor, which allows to represent a priori and time varying risk field. The time-varying risk field allows to model several interesting scenarios. In this work, we consider the case of area surveillance against moving targets or external threats penetrating through the perimeter. We present a feedback control law for the platoon of surveying agents that implies the emergency of locally optimal configurations, that adapt to time evolving harbor environments.

Paper Nr: 3

A Simultaneous Cyber-attack and a Missile Attack


Bao U. Nguyen

Abstract: We model a missile defence scenario where the red force infects the blue force command and control systems while at the same time launching re-entry vehicles toward the blue force. As a result, the blue force missile defence system is weakened due to loss of time, loss of engagement opportunities, loss of network centric capabilities etc. The impacts of the cyber-attack on missile defence metrics are determined through a number of key measures of effectiveness such as the probability of raid negation and the expected number of targets neutralized.