Abstract
On platform attitude measurement: The integration of platform attitude measurements with existing geophysical platforms was done regularly in all airborne geophysical platforms equipped with the Geonics EM‐18 VLF system where roll and pitch compensation was done with a gyroscope‐derived signal (Geonics 1982 Catalog, EM‐18 data sheet). Also, the integration of full platform attitude measurement (pitch, yaw, and roll) with a geophysical platform was done as an example by SGC. Their platform carried, among others, a three‐component magnetometer (SGC TRIX‐03 data sheet) and a RAMA‐style VLF system (Granar, 1981). Pendulum‐based systems have also been used in both fixed wing aircrafts and helicopter towed birds. Current developments in platform attitude measurements include multiple GPS antennas and receivers with measuring tolerances lower than one degree (among others, NASA, 1992).
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