Abstract:

The geomagnetic field vector is a function of the satellite’s position. Autonomous LEO satellite navigation can be achieved based on the measurement data of the onboard threeaxis magnetometers. Because of the indefinitness and long-term variableness existing in the magnetic field, the navigation precision is limited when only using a single magnetometer. A new method of modifying the magnetic Gauss parameter and calibrating the magnetometer model error based on magnetic information is presented. Firstly, the integer measurement model of three-axis magnetometer is established. The mathematical models of the magnetic Gauss parameter and threeaxis magnetometers are deduced, which connects with magnetic information. The optimal estimate of error parameters is obtained by an advanced filter method. Secondly, the LEO satellite is analyzed by the magnetic field. The integrated navigation method and algorithm are designed and simulated. Finally three results of computer simulation show that the proposed method can not only improve the navigation precision and convergence but also perfectly be applied to engineering practice.