Determination of differential code biases with multi-GNSS observations
Determination of differential code biases with multi-GNSS observations
复制标题
通过多 GNSS 观测确定差分代码偏差
DOI：
10.1007/s00190-015-0867-4
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发表时间：
2016-03-01
影响因子：
4.4
通讯作者：
Tan, Bingfeng
中科院分区：
文献类型：
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作者：
Wang, Ningbo;Yuan, Yunbin;Tan, Bingfeng
为了更好地了解全球导航卫星系统的差分码偏差(DCB)，根据国际GNSS服务(IGS)的多GNSS实验(MGEX)的观测结果，将IGGDCB方法扩展到估计全球定位系统(GPS)、GLONASS、北斗导航卫星系统(BDS)和伽利略(Galileo)的频内和频间偏差。在IGGDCB方法中，局地电离层总电子含量是用广义三角级数(GTS)函数来模拟的，而不是使用全球电离层模型或先验电离层信息。将IGGDCB方法估计的DCB与欧洲轨道确定中心(CODE)和德国航空航天中心(DLR)的DCB产品以及两年(2013年和2014年)的广播定时群延时(TGD)参数进行了比较。结果表明，本工作得到的GPS和GLONASS内频偏与DLR估计的精度水平相同(相对于编码乘积，两个星座的精度分别约为0.1和0.2-0.4 ns)。24个月期间估计的基于IGGDCB的频率间偏差的精度水平分别为GPS约0.29 ns，GLONASS约0.56 ns，BDS约0.36 ns，Galileo约0.24 ns。在这里，GPS和GLONASS偏差的精度相对于代码的乘积进行了评估，而BDS和伽利略的偏差则与DLR的估计进行了比较。此外，基于IGGDCB的分布式卫星的月稳定指数分别为0.11(GPS)、0.18(GLONASS)、0.17(BDS)和0.14(伽利略)ns。
In order to better understand the differential code biases (DCBs) of global navigation satellite system, the IGGDCB method is extended to estimate the intra- and inter-frequency biases of the global positioning system (GPS), GLONASS, BeiDou navigation satellite system (BDS), and Galileo based on observations collected by the multi-GNSS experiment (MGEX) of the international GNSS service (IGS). In the approach of IGGDCB, the local ionospheric total electronic content is modeled with generalized triangular series (GTS) function rather than using a global ionosphere model or a priori ionospheric information. The DCB estimated by the IGGDCB method is compared with the DCB products from the Center for Orbit Determination in Europe (CODE) and German Aerospace Center (DLR), as well as the broadcast timing group delay (TGD) parameters over a 2-year span (2013 and 2014). The results indicate that GPS and GLONASS intra-frequency biases obtained in this work show the same precision levels as those estimated by DLR (about 0.1 and 0.2–0.4 ns for the two constellations, respectively, with respect to the products of CODE). The precision levels of IGGDCB-based inter-frequency biases estimated over the 24-month period are about 0.29 ns for GPS, 0.56 ns for GLONASS, 0.36 ns for BDS, and 0.24 ns for Galileo, respectively. Here, the accuracies of GPS and GLONASS biases are assessed relative to the products of CODE, while those of BDS and Galileo are compared with the estimates of DLR. In addition, the monthly stability indices of IGGDCB-based DCBs are 0.11 (GPS), 0.18 (GLONASS), 0.17 (BDS), and 0.14 (Galileo) ns for the individual constellation.