Three-axis magnetometer closed loop test system and method based on dynamic earth magnetic field simulation

Abstract

The invention relates to a three-axis magnetometer closed loop test method and system based on dynamic earth magnetic field simulation. A three-axis magnetometer is placed inside an enclosed earth magnetic field simulator to shield interference of an external environment electromagnetic field and a local earth magnetic field; a high-precision IGFR earth magnetic field model is adopted, the earth magnetic field intensity of an aircraft on a track is calculated according to the track information of the aircraft, and the intensity is converted into current outputs to drive the earth magnetic field simulator to generate a corresponding magnetic field; the three-axis magnetometer measures the intensity of the magnetic field generated by the earth magnetic field simulator in real time and outputs the intensity to a spaceborne computer to assist other attitude sensors in conducting attitude and navigation solution; and magnetron currents and control instructions needed for attitudes are also calculated. In this way, closed loop control is formed. A corresponding relation between simulator drive currents and the magnetic field intensity of the simulator is calibrated through the high-precision three-axis magnetometer, and external interference is compensated by means of correction. During a closed loop simulation test process, the precision of the magnetic field generated by the simulator is increased by means of real-time monitoring and dynamic closed loop correction.

Description

technical field [0001] The invention belongs to the technical field of ground simulation test and test of an aircraft attitude and orbit control system, in particular to a three-axis magnetometer closed-loop simulation test system and method based on dynamic geomagnetic field simulation. Background technique [0002] As a sensitive component for geomagnetic field measurement, the three-axis magnetometer not only has the characteristics of low power consumption, light weight, and long life, but also has the advantage of not being limited by sunlight. It is widely used in aircraft three-axis attitude determination and navigation, and can also As a redundant measurement sensitive component, the aircraft attitude measurement accuracy and navigation accuracy are improved. The earth's magnetic field is distributed within tens of thousands of kilometers above the earth, and it decays rapidly with the increase of the orbital height. The earth's magnetic field at the middle and low...

AI Technical Summary

Problems solved by technology

The magnetic shielding method can provide a fairly stable weak magnetic environment, but the construction requires high-permeability alloys, the cost is high, and the magnetic field cannot be controlled, and the uniformity of the generated magnetic field is not ideal.

The Helmholtz coil current method can generate zero magnetic field and stable magnetic field in a certain area of ​​the coil system by adjusting the current in the coil, but it is affected by the coil size, coil size deviation, shape deviation, installation error, coil winding Due to the influence of processing and installation errors such as deviation, the magnetic fields generated in the three axis directions are coupled, and the uniformity and linearity are poor

The magnetic environment simulation equipment used for the entire star, such as the dynamic magnetic field simulation equipment of IABG in Germany and Goddard Aerospace Center in the United States, as well as the CM1 and CM2 magnetic field simulation equipment in my country, are difficult to be installed in the attitude and orbit control system due to the huge project and high cost. Promoted in level semi-physical simulation experiments

Images