Noise Removal Using Multi-Channel Coherence

摘要

In this report we show how magnetic noise occurring on an ocean floor magnetometer can be reduced using a collocated pressure sensor and a separate more distant magnetometer. To achieve this, a multi-channel coherence technique is applied to the measurement data. The removal of magnetic noise on ocean floor magnetometers has several applications, including mine warfare systems and ocean surveillance systems. Decreasing the background magnetic noise by 10-20 dB will allow the detection of a vessel magnetic field with amplitude the same order of magnitude as the background field, and with frequency content similar to that of the background field.