A magnetometer array has been installed aboard the SCARAB submersible to enable it to detect and track buried undersea telephone cable. Four three‐axis magnetometers sense the magnetic field of a 25‐Hz current applied to the cable. The magnetometer signals are filtered, amplified, digitized, and multiplexed onto SCARAB's umbilical cable for transmission to the control ship. A shipborne minicomputer processes these signals in real time to determine the cable location, which is continuously displayed to SCARAB's operator on a graphics terminal. This paper describes the development and capabilities of the system. Among the topics discussed are a history of the cable‐locating problem, an analysis of the factors governing the achievable 25‐Hz signal level, a description of the magnetic noise spectrum and its sources, and a discussion of the signal‐processing techniques. We also examine the dependence of system performance on signal and noise levels.
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