AIR-GROUND INTEGRATED EARTH MAGNETIC FIELD COMBINED OBSERVATION METHOD AND SYSTEM

摘要

An air-ground integrated earth magnetic field combined observation method and system. The method comprises: before an earth magnetic field measurement task is started, determining a model parameter of a local earth magnetic field model by using earth magnetic field information collected by a mobile ground station (S101); when the earth magnetic field measurement task is being executed, obtaining a dynamic model along the flight route by using earth magnetic field information collected by an airborne part on a flight route and the model parameter (S102); obtaining a measurement error model along the flight route by using an attitude measurement error, acquired by the airborne part, during the flight of an aircraft with a predetermined attitude (S103); and obtaining, by using the dynamic model and the measurement error model, an estimate, in a geographical coordinate system, of the earth magnetic field information collected on the flight route (S104). By means of the method, measurement precision of an earth magnetic field vector represented in a geographical coordinate system can be improved, and abnormality detection of the earth magnetic field can be performed.