Summary of Ground Magnetic Tests of TD100 UAV


  1. Nelson, J.B.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);Aeromagnetic Solutions Incorporated, Gloucester ON (CAN)
Magnetic contamination in the UAV was identified and quantified using a Forster Magnetoscop fluxgate sensor. Mounting hardware such as screws, nuts, lock washers, etc. that were found to be magnetic were replaced with magnetically-quieter components. In particular, a very magnetic lock washer was found in the wingtip. It has been removed. However, this points out that care must be taken when removing or mounting the accelerometers and servos as if a screw or lock washer falls into the inner wing, it may slide around in flight creating magnetic noise that cannot be compensated with the Tolles and Lawson algorithm. Also, a brass bolt used in the wingpod was found to be magnetic and because of its proximity to the magnetometer, it would have caused significant problems in trying to obtain good compensation. It was replaced with a nonmagnetic variant. The accelerometers are quite close to the wingpod and as such, care should be taken to ensure that the mounting screws for the accelerometer are magnetically clean. The GPS grounding planes are quite magnetic and Tony Matthews of Brican Flight Systems has agreed to replace them with Copper foil. Four very magnetic screws were found inside the fuselage, and Tony Matthews has indicated that they will be replaced with stainless steel screws.
Magnetic noise;magnetic testing
Report Number
DRDC-RDDC-2015-C352 —
Date of publication
01 Oct 2015
Number of Pages
Electronic Document(PDF)

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