Collection and Analysis of Multi‐Sensor Ordnance Signatures withMTADS

Abstract

The Multi‐sensor Towed Array Detection System (MTADS) has been used to record the total‐field magnetometer and pulsed‐induction signatures of a range of ordnance under conditions of depth and orientation expected to be encountered at typical ranges. The MTADS Data Analysis System has been used to perform analyses of the measured signatures. In all cases, the magnetic anomalies are well fit by a model based on a magnetic dipole. Accurate positions and depths are obtained from this model although a range of sizes result depending on the orientation of the ordnance. The modified pulsed‐induction sensors used in the MTADS array have the sensitivity to detect small and intermediate ordnance at depths below the detection limit of the magnetometer array. The EM anomaly fitting algorithm, which is based on a sphere model, is not as successful at estimating the depth and size of the ordnance. We have developed a preliminary, prolate spheroid model that better represents the measured ordnance signatures. We are dev...