TJS-2 geostationary satellite orbit determination using onboard GPS measurements
TJS-2 geostationary satellite orbit determination using onboard GPS measurements
复制标题
TJS-2 利用星载 GPS 测量数据确定地球静止卫星轨道
DOI：
10.1007/s10291-018-0750-x
复制
发表时间：
2018
期刊：
影响因子：
4.9
通讯作者：
Li Wenwen
中科院分区：
文献类型：
--
作者：
Jiang Kecai;Li Min;Wang Meng;Zhao Qile;Li Wenwen
本研究分析了地球远端GPS卫星跟踪信号的星载数据质量，并利用30小时和3天轨道弧长的码和载波相位观测值确定了地球静止卫星的轨道。分析结果表明，星载接收机可跟踪6-8颗GPS卫星，最小载噪比为24 dB Hz，最大载噪比为45 dB Hz。对于位于导航星座上方的高空平台上的GPS接收机，地球的阻挡和弱信号强度通常会导致分段GPS信号跟踪和模糊度参数的数量增加。单个GPS卫星可被连续跟踪少至几分钟，长至3小时。此外，考虑仰角的负符号反映了研究中GPS卫星在接收器下方被跟踪的事实。GPS卫星主要出现在-53 °至-83 °的仰角范围内，精度值的衰减可能达到10或100以上。此外，它被观察到，当一个信号遭受大气折射，其他GPS信号同时跟踪的接收机经历强烈的系统误差的代码观测。基于单频码和载波相位测量，30小时轨道确定弧之间的重叠比较的平均3D均方根（RMS）值为2.14米。然而，我们发现载波相位残差中也存在一些偏差，这导致轨道精度差。为了消除偏差的影响，我们为每个GPS卫星建立了一个校正序列。校正后，平均3D RMS降至0.99 m，改善了53%。
This study analyzes the quality of onboard data of tracking signals from GPS satellites on the far side of the earth and determines the orbit of the geostationary satellite using code and carrier phase observations with 30-h and 3-day orbit arc length. According to the analysis results, the onboard receiver can track 6–8 GPS satellites, and the minimum and maximum carrier to noise spectral densities were 24 and 45 dB-Hz, respectively. For a GPS receiver on a high-altitude platform above the navigation constellations, the blocking of the earth and a weak signal strength usually cause a piece-wise GPS signal tracking and an increase in the number of ambiguity parameters. Individual GPS satellites may be continuously tracked for as little as several minutes and as long as 3 h. Moreover, considering the negative sign of elevation angles reflects the fact that GPS satellites are tracked below the receiver in the study. GPS satellites appear mainly in the elevation angle range of − 53° to − 83°, and dilution of precision values could reach ten or one hundred and more. Also, it is observed that when a signal suffers from atmospheric refraction, other GPS signals tracked simultaneously by the receiver experience strong systematic errors in the code observations. Based on single-frequency code and carrier phase measurements, the mean 3D root mean square (RMS) value of the overlap comparisons between 30-h orbit determination arcs is 2.14 m. However, we found that there were also some biases in the carrier phase residuals, which contributed to poor orbit accuracy. To eliminate the effects of the biases, we established a correction sequence for each GPS satellite. After corrections, the mean 3D RMS was reduced to 0.99 m, representing a 53% improvement.