Does the Depth Sensor [with AHRS] have immunity against temporary magnetic interference? – Transcript
Sometimes we’ll get asked about temporary, magnetic interference when working around steel structures. For example; how will that affect the heading? In terms of magnetics any steel structures won’t affect the pitch and roll at all but a prolonged exposure to a magnetic source will affect the heading. Within the ISD4000 Depth Sensor it’s got three accelerometers, three gyroscopes and three magnetometers. One of each in the kind of X Y and Z planes.
These all fuse together and an output of that fusion algorithm is heading, pitch and roll. The heading is based on magnetic North so when it first powers up the magnetometers find where North is and heading is aligned to that and the gyros and accelerometers help stabilise that heading so if you have a temporary magnetic interference and maybe come up close to a pipeline that’ll affect the magnetometers but the gyroscopes and accelerometers don’t register any change.
They hold the original heading. If you sit there for a long time it will slowly drift round but you have a limited amount of protection from a temporary magnetic interference. If you require heading pitch and roll with a higher level of immunity for magnetic effects then we have our ISM3D heading pitch and roll sensor which is based on a higher grade accelerometers and gyroscopes, it’s worth checking out.
We hope that helps answer your question; Does the Depth Sensor [with AHRS] have immunity against temporary magnetic interference? If you want any more information on the ISD4000 Depth Sensor you’ll find the latest data sheet, manuals, demonstration videos and more technical information on our ISD4000 product Page
or you can drop us an email at support@impactsubsea.co.uk we’ll answer any technical questions that you have.
