Detection and Discrimination of Small Munitions using Giant Magnetoresistive (OMR) Sensors.

摘要

This effort focused on characterizing the noise floor of giant magnetoresistive (GMR) sensors and evaluating their performance in detecting small (81 mm) munitions. A GMR sensor allows data acquisition over a broadband frequency spectrum in a single coverage, thus providing the capability of measuring responses presently requiring both a magnetometer and frequency domain or time domain electromagnetic induction sensor. Both the Honeywell and NVE GlvIR sensors studies have similar operating range, sensitivity, and noise levels. The additional featurs available on the Honeywell sensors make them the GMR sensors of choice. The performance characteristics of a single GMR sensor were studied, both as a static magne6tic field resolution of just than 10 nT, performed similarly to a cesium vapor magnetometer. When tested in dynamic mode for measuring the response of a single-tum copper coil, multi-tum copper coil, and solid copper sphere, the GlvJR sonar measured a distinct decay response for each target.