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Target Positioning Accuracy Analysis Using Geo-referenced Sidescan Sonar Data, RMS TDP Builds 2 and 3

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Technical Report

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Defence R and D Canada Atlantic Dartmouth, NS

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U The Remote Minehunting System Technology Demonstrator Project RMS TDP was a three-year program with the goal of providing recommendations to the Canadian Navy on semi-submersible-based minehunting technology. A key component of the project was a series of sea trials during which ongoing improvements to design and operation were tested. During the second and third of these trials, Builds 2 and 3, a quantity of sidescan sonar data over deployed and pre-existing target arrays was collected. The subsequent analysis of this data provides a method for assessing the RMS performance in meeting the critical initial specifications on target positioning accuracy of 10 m rms. U The results of this analysis using geo-referenced sonar data show positioning accuracy that meets the specifications, with Build 2 having a positioning accuracy of 5 m rms, and Build 3, marginally larger at 7-8 m rms. An important difference between the results for the Builds is that for Build 2, the sidescan sonar data were geo-referenced using a simple straight-cable model to determine towfish position, where the Build 3 analysis used towfish position determined by an onboard Inertial Navigation System INS. The only slightly poorer positioning accuracy for Build 3 is due to observed wander of the towfish INS, however attaining this level of positioning accuracy with any such system is noteworthy.

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