应用于皮卫星的地球磁场测量系统设计

摘要

设计了一种应用于皮卫星的地球磁场测量系统.分析了影响所设计磁强计测量准确度的各种因素,并通过置位/复位脉冲、信号处理电路以及电桥补偿的方法提高其准确度.为了测试地球磁场的真实大小,对磁强计进行了标定因数校正实验.考虑到皮卫星运行的复杂环境,对该系统进行了动态响应实验.实验结果表明设计的磁强计准确度高,测量误差(1σr)为10-8 Tesla,在10°/s角速度旋转的情况下能正常工作,能够满足皮卫星的要求.%The measurement system of the Earth magnetic field for pico-satellites is presented. It analyzes the various factors affecting the measurement accuracy of the magnetometer and improves its accuracy by set/reset pulses, signal processing and bridge offset voltage compensation. In order to measure the actual value of the earth magnetic field and test the dynamic response of the magnetometer,the relevant experiments are executed. The result shows that the meas urement error of the system can reach as low as 10~8 Tesla,and the system can work well in the condition of spinning on the speed of 10°/s, which proves that the design can meet the requirements of pico-satellites.