在地磁场中测定卫星磁矩方法的研究

本文给出了在地磁场中测量卫星磁矩的环境磁场作图法。通过采用原位和斜置(或倒置)的重复测量、对测量探头和参考探头的输出作差值处理、使探头沿地磁场东西取向和试验体转置90°以保持它与探头的相对高斯态不变等方法,较好地解决了在地磁场中磁测碰到的两个主要技术难题:分离永磁矩和感磁矩,有效地抑制地磁场的噪声。并由试验表明,对于磁矩在500mA-m2以上的卫星,由该法给出的测量相对误差不大于10%。 

RESEARCH ON METHODS FOR DETERMINING THE MAGNETIC MOMENT OF A SATELLITE IN EARTH'S MAGNETIC FIELD

Magnetic design and test should be considered in the design and making of a satellite,because the magnetic torques resulting from the interaction between the magnetic properties of the satellite and the ambient magnetic field tend to disturb its attitude.This paper presents the ambient field mapping method to determine a satellite magnetic moment.Its main point is to acquire experimentally and deduce mathematically the magnetic field data of a satellite in the limited region in earth's field.In order to do that,we must overcome two main difficulties: separating permanent moment from induced moment;effectively inhibiting noise of earth's field.This method has resolved these problems by using the following techniques in a better way:1,repeating measurement at original and inclined (or inverse) position.2,obtaining the difference between the outputs from the measuring probe and the reference probe.3,let the axis of the probe direct to the earth's field east,turning the test subject over 90° of angle to keep relative magnetic state between it and the probe.The results that have been attained by analysis and test indicate that the error is not more than 10% for magnetic moment above 500 mA-m2.It can be expected that the precision can be increased after improvement.