Undifferenced ionospheric-free ambiguity resolution using GLONASS data from inhomogeneous stations
Undifferenced ionospheric-free ambiguity resolution using GLONASS data from inhomogeneous stations
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使用来自非均匀站的 GLONASS 数据进行无差异的无电离层模糊度解析
DOI：
10.1007/s10291-017-0691-9
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发表时间：
2017
期刊：
影响因子：
4.9
通讯作者：
Liu Jingnan
中科院分区：
文献类型：
--
作者：
Zhao Qile;Li Xiaotao;Liu Yang;Geng Jianghui;Liu Jingnan
GLONASS频分多址信号使得模糊度解算（AR）相当困难，因为：（1）不同的卫星使用不同的波长，以及（2）伪距频率间偏差（IFB）不能通过简单的函数精确地建模。在这项研究中，AR方法的基础上的电离层自由组合的波长约为5.3厘米的GLONASS精密单点定位（PPP）的评估。这种方法简化了GLONASS AR，因为伪距IFB无关紧要，并且可以在非均匀接收器上启用PPP-AR。对来自欧洲165个台站的一个月的全球轨道导航卫星系统数据进行了处理，以适应不同的网络规模和不同的观测期。我们发现，89.9%的分数部分的电离层自由模糊度同意在± 0.15个周期的一个小网络（半径= 500公里），而77.6%的一个大网络（半径= 2000公里）。在3小时GLONASS的情况下，只有静态PPP解决方案的小网络，可靠的AR可以实现固定的GLONASS模糊度的数量占所有候选模糊度的97.6%。东、北、上分量相对于日解的均方根值分别由1.0、0.6、1.2cm提高到0.4、0.4、1.1cm。当GPS PPP-AR同时进行时，定位性能可以显著改善，使得GLONASS模糊度固定率在小时解的情况下从74.4%上升到95.4%。最后，我们引入模糊固定GLONASS轨道，重新尝试GLONASS PPP-AR与模糊浮动轨道的上述解决方案相比。我们发现，模糊度固定轨道导致明显更好的协议之间的电离层无模糊度小数部分的情况下，大网络，即80.5%的小数部分落在± 0.15个周期相比，模糊浮动轨道的74.6%。我们的结论是，高效率的GLONASS电离层自由PPP-AR是可以实现的情况下，几个小时的数据时，GPS PPP-AR也完成了，模糊度固定的GLONASS轨道将大大有助于PPP-AR在广泛的地区。
GLONASS frequency division multiple access signals render ambiguity resolution (AR) rather difficult because: (1) Different wavelengths are used by different satellites, and (2) pseudorange inter-frequency biases (IFBs) cannot be precisely modeled by means of a simple function. In this study, an AR approach based on the ionospheric-free combination with a wavelength of about 5.3 cm is assessed for GLONASS precise point positioning (PPP). This approach simplifies GLONASS AR because pseudorange IFBs do not matter, and PPP-AR can be enabled across inhomogeneous receivers. One month of GLONASS data from 165 European stations were processed for different network size and different durations of observation periods. We find that 89.9% of the fractional parts of ionospheric-free ambiguities agree well within ± 0.15 cycles for a small network (radius = 500 km), while 77.6% for a large network (radius = 2000 km). In case of the 3-hourly GLONASS-only static PPP solutions for the small network, reliable AR can be achieved where the number of fixed GLONASS ambiguities account for 97.6% within all candidate ambiguities. Meanwhile, the RMS of the east, north and up components with respect to daily solutions is improved from 1.0, 0.6, 1.2 cm to 0.4, 0.4, 1.1 cm, respectively. When GPS PPP-AR is carried out simultaneously, the positioning performance can be improved significantly such that the GLONASS ambiguity fixing rate rises from 74.4 to 95.4% in case of hourly solutions. Finally, we introduce ambiguity-fixed GLONASS orbits to re-attempt GLONASS PPP-AR in contrast to the above solutions with ambiguity-float orbits. We find that ambiguity-fixed orbits lead to clearly better agreement among ionospheric-free ambiguity fractional parts in case of the large network, that is 80.5% of fractional parts fall in ± 0.15 cycles in contrast to 74.6% for the ambiguity-float orbits. We conclude that highly efficient GLONASS ionospheric-free PPP-AR is achievable in case of a few hours of data when GPS PPP-AR is also accomplished, and ambiguity-fixed GLONASS orbits will contribute significantly to PPP-AR over wide areas.
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影响因子：
4.4
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