Accession Number : AD1017870

Title :   Absolute Positioning Using The Earth's Magnetic Anomaly Field

Descriptive Note : Technical Report,01 Sep 2014,15 Sep 2016

Corporate Author : AFIT WPAFB United States

Personal Author(s) : Canciani,Aaron J

Full Text :

Report Date : 15 Sep 2016

Pagination or Media Count : 264

Abstract : Achieving worldwide alternatives to GPS is a challenging engineering problem. Current GPS alternatives often suffer from limitations such as where and when the systems can operate. Navigation using the Earth's magnetic anomaly field, which is globally available at all times, shows promise to overcome many of these limitations. We present a navigation filter which uses the Earth's magnetic anomaly field as a navigation signal to aid an inertial navigation system (INS) in an aircraft. The filter utilizes highly-accurate optically pumped cesium (OPC) magnetometers to make scalar measurements of the Earth's magnetic field and compare them to a map using a marginalized particle filter approach. We demonstrate navigation accuracy of 13 meters DRMS with a high quality magnetic anomaly map at low altitudes with real flight data. We conduct a simulation over the continental United States to predict accuracies with respect to variables like location and altitude. Finally, we address the problem of map availability by presenting a method for a self-building magnetic anomaly model.

Descriptors :   Magnetic anomalies , Magnetic anomaly detection , Magnetic navigation , Magnetic fields , Inertial navigation , aircraft , Kalman filtering , Navigational aids , Global positioning system

Distribution Statement : APPROVED FOR PUBLIC RELEASE