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The World Magnetic Model and Inertial Sensor Systems

The World Magnetic Model (or WMM) is a large spatial-scale representation of the earth’s magnetic field that impacts the accuracy of compasses, especially Digital Magnetic Compasses (DMCs) – a type of inertial sensor. The WMM is the standard model used for navigation. The model is used by the US Department of Defense, the UK Ministry […]

Sparton Releases Updated Firmware

Improved In-Field Calibration, Superior Performance! Sparton Navigation and Exploration has released new firmware for its industry-leading inertial systems. These firmware upgrades (Version 4.2.10) improve the in-field calibration for Sparton’s AHRS-8, GEDC-6E, and DC-4E. The updated firmware will provide users with the following features: Improved 3D in-field calibration for enhanced accuracy Created a new in-field calibration […]

Setting Our Sights with the New and Improved Website

Welcome and thank you for visiting our new and improved website – www.spartonnavex.com.  We are excited for this launch and hope you are as well.  This website offers some great improvements for the user experience.  Some of those highlights are: Responsive design that adapts for any screen resolution, including mobile Easy, intuitive navigation More streamlined […]

In-Field Calibration

Inertial systems do not recalibrate on their own if the magnetic environment changes. The magnetic environment is unpredictable and depends on so many factors that it would not be practical to have the inertial system perform recalibrations continuously during operation. If the inertial system calibration is performed in a poor magnetic environment, the inertial system measurements will be poor.

Operational Compensation Cosiderations

Operational Compensation Considerations

The operational environment of the device will present a wide variety of magnetic anomalies that must be considered. Traditional inertial system compensation procedures cannot predict or correct for external environmental magnetic disturbances. The operational environment will include local magnetic disturbances occurring naturally and from manmade objects.

Compensation for Magnetic Disturbances

Compensation for Magnetic Disturbances Ideally, during the integration process, the magnetic interferences from application components have been minimized by careful material sections and placement of components. The platform size and weight limitations will of course limit how magnetically quiet the device can be. The inertial system on-board calibration and adaptive compensation can be used to […]

Evaluation of Magnetic Disturbances

Evaluation of Magnetic Disturbances Product-specific integration guidelines for the inertial system are unique for each application. It is difficult to calculate or predict the magnetic profile of each component in order to provide specific guidelines to the designers. Also, application packaging and weight constraints make it impossible to create an ideal magnetic environment for the […]

Magnetic Field Distortions

Batteries Since batteries are magnetic they must be kept as far away from the inertial system as possible. For handheld applications containing batteries, placement and orientation of the batteries must be considered. Batteries are of particular concern because their magnetic fields distortion may vary over their life and can even vary from battery to battery. […]

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