关于海洋大数据技术开发平台研究

基于星载船舶自动识别系统（automatic identification system, AIS）法拉第旋转角的测量原理，提出一种计算全球电离层电子总含量（total electron content, TEC）的新方法。通过“天拓五号”卫星上搭载的AIS接收机和极化天线，利用极化天线接收到的功率信息计算出法拉第旋转角，通过TEC与法拉第旋转角之间的转换关系反演出TEC值，并基于Kriging方法估算出的TEC值进行区域TEC地图的构建。结果表明，利用本文方法测量出的TEC值与IGS探测到的TEC值最大误差比例为10%左右，误差一般在0.3～0.8 TECU，估计值与IGS探测到的TEC值最大相差1.5 TECU。估算结果与IGS探测得到的TEC值具有很好的一致性，验证了本文方法的可行性。

Ionospheric sounding and tomography using automatic identification system (AIS) and other signals of opportunity

Based on the measurement principle of the Faraday rotation angle of the automatic identification system (AIS) of spaceborne ships in this paper, a new method is proposed for calculating the global ionospheric total electron content (TEC). Through the AIS receiver and polarized antenna mounted on the “Tiantuo-5” satellite, the Faraday rotation angle is calculated using the power information received by the polarized antenna, and the TEC value is inverted through the conversion relationship between the TEC and the Faraday rotation angle, and the regional TEC map is constructed based on the TEC values estimated by the Kriging method. The results show that the maximum error ratio between the TEC value measured by this method and the TEC value detected by IGS is about 10%, and the general range of error is between 0.3−0.8 TECU, and the maximum difference between the estimated value and the TEC value of IGS is 1.5 TECU. The estimated result is in good agreement with the TEC value detected by IGS, which verifies the feasibility of this method.