CAJ | 학술논문

大气密度模型对以载人飞船为代表的低轨航天器精密定轨及轨道预报有很大影响。在载人航天工程中使用的大气密度模型对于地磁指数和太阳辐射流量的输入有两种方式，即输入固定值和输入分段值。利用MSIS90模型，通过天宫一号目标飞行器的轨道数据分析对比了不同参数输入方式，不同数据长度以及不同地磁指数对定轨和轨道预报的影响。结果表明，数据弧段短且地磁变化不大时，输入固定值的方式获得的轨道预报精度较高；长弧段定轨和长期轨道预报的场合下输入分段值的方式预报精度高，稳定性好，适用范围广，操作更简单。
대기밀도모형대이재인비선위대표적저궤항천기정밀정궤급궤도예보유흔대영향。재재인항천공정중사용적대기밀도모형대우지자지수화태양복사류량적수입유량충방식，즉수입고정치화수입분단치。이용MSIS90모형，통과천궁일호목표비행기적궤도수거분석대비료불동삼수수입방식，불동수거장도이급불동지자지수대정궤화궤도예보적영향。결과표명，수거호단단차지자변화불대시，수입고정치적방식획득적궤도예보정도교고；장호단정궤화장기궤도예보적장합하수입분단치적방식예보정도고，은정성호，괄용범위엄，조작경간단。
Thermosphere density model plays an important role in low Earth satellites orbit determination and forecasting. There are two ways to input geomagnetic and solar radiation parameters when using thermosphere models, namely, fixed parameters input and variable parameters input. Using MSIS90 model and Tiangong-1 orbit data, the precision of orbit determination and forecasting is analyzed with different input methods of parameters, different length of data and different geomagnetic parameters. Results show that the method of fixed parameters input is better with less observation data in geomagnetic quiet condition. However, in long-term orbit forecasting with more observation data, the method of variable parameters input is more accurate and easier to operate.