ITRS/J2000坐标转换误差及其对掩星反演的影响分析

分别对ITRS/J2000转换过程中的极移/潮汐章动、常数偏差矩阵等误差造成的影响进行分析，并分析季节变化、太阳活动、地磁活动等对坐标转换精度的影响。对2019年的IGS精密星历数据进行ITRS地固系转J2000惯性系坐标分析表明，潮汐章动造成的坐标转换误差为0.44 m，春季坐标转换误差(0.23 mm)是其他季节的约3倍；常数偏差矩阵对坐标转换误差可造成1.7 m的影响。对中性大气掩星反演的轨道转换加入误差改正项进行分析表明，潮汐章动和常数偏差矩阵对反演的温度产品分别造成0.09 K和0.19 K的误差影响。建议在进行GNSS无线电掩星反演中采用潮汐章动的高频改正，并且在ITRS/J2000转换过程中推荐将常数偏差矩阵进行旋转处理。

Analysis of ITRS to J2000 Coordinate System Conversion Error and Its Influence on Occultation Inversion

We analyze the influence of errors such as pole shift, tidal nutation, and constant deviation matrix in the process of ITRS to J2000, and analyze the impact of seasonal changes, solar activities, geomagnetic activities, etc. on the accuracy loss of coordinate conversion. The coordinate analysis of the IGS precision ephemeris data of 2019 shows that the coordinate conversion error caused by the tide and nutation is 0.44 m, the spring coordinate conversion error is 0.23 mm, and the spring coordinate conversion error is about 3 times that of summer, autumn and winter. The constant deviation matrix can affect the coordinate conversion error by 1.7 m. The error correction term is added to the orbit conversion of the neutral atmosphere occultation inversion. The tidal nutation and the constant deviation matrix cause the error effects of 0.09 K and 0.19 K respectively on the inverted temperature products. It is recommended to use the high frequency correction of tidal nutation in the inversion of GNSS radio occultation, and it is recommended to perform a constant deviation matrix for rotation processing during the conversion of ITRS to J2000.