Coordinate transformation method aiming at mobile platform positioned near south and north poles of earth

Abstract

The invention provides a coordinate transformation method aiming at a mobile platform positioned near the south and north poles of the earth and aims at providing a coordinate transformation method. The coordinate transformation method is little influenced by the movement and positioning errors of the mobile platform, is strong in operability, is based on building of a new airborne geographical rectangular coordinate system and is simple and easy. The coordinate transformation method can be realized by the following scheme that the new airborne geographical rectangular coordinate system is defined, the current position A of the mobile platform is set as an origin, the X axis is set as the intersected line of a plane P1 and a plane P2, the P1 is the plane which passes through the point A and is parallel to XZ planes in an ECEF coordinate system, the P2 is the horizontal plane of the point A, the forward direction adopts the forward direction of the X axis in the ECEF coordinate system, the Z axis is vertical to the P2 and is downward, and the Y axis, the X axis and the Z axis form a right-handed coordinate system; an included angle formed by the projection of the forward direction of the plane axis and the forward direction of the X axis of a new airborne geographical rectangular coordinate system is defined as a new yaw angle; the new geographical rectangular coordinate system and the yaw angle are utilized for finishing the coordinate transformation.

Description

technical field [0001] The invention relates to a method for converting the position vector of a measurement target between an airborne Cartesian coordinate system and an Earth-centered Earth-fixed (abbreviated as ECEF) Cartesian coordinate system when a mobile platform drives into the vicinity of a polar region. Background technique [0002] The coordinate transformation of the target position vector is a very basic content in the field of aeronautical information processing. It is generally transferred from the airborne spherical coordinate system (ie distance, azimuth and pitch angle) to the airborne rectangular coordinate system (the origin of the coordinates is the center of mass of the aircraft, X Axis parallel to the front of the nose, Y-axis perpendicular to the right wing, Z-axis perpendicular to the X and Y axes pointing to the belly of the aircraft), and then transferred to the airborne geographic Cartesian coordinate system (generally using the North East Cartesia...

AI Technical Summary

Problems solved by technology

[0009] The task of the present invention is to aim at the deficiencies of the above-mentioned prior art, to provide a mobile platform less affected by the movement and positioning errors, with strong operability, based on the construction of a new airborne geographic rectangular coordinate system, simple and easy to understand Coordinate transformation method to solve the conversion problem of measuring target position vector between the airborne rectangular coordinate system and the ECEF rectangular coordinate system, and reduce the influence of the continuous change of the true north direction caused by the movement of the mobile platform or positioning error

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