GLONASS pseudorange inter-channel biases considerations when jointly estimating GPS and GLONASS clock offset
GLONASS pseudorange inter-channel biases considerations when jointly estimating GPS and GLONASS clock offset
复制标题
联合估计 GPS 和 GLONASS 时钟偏移时的 GLONASS 伪距通道间偏差考虑因素
DOI：
10.1007/s10291-017-0630-9
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发表时间：
2017-10-01
期刊：
影响因子：
4.9
通讯作者：
Liu, Teng
中科院分区：
文献类型：
--
作者：
Chen, Yongchang;Yuan, Yunbin;Liu, Teng
频分多址技术引起的信道间偏差（ICBs）会影响GLONASS系统的时钟偏移估计。分析了ICBs对GPS/GLONASS联合钟差估计的影响。提出了一种有效的GPS/GLONASS卫星钟差联合估计方法，用于产生30 s钟差产品。在估计过程中，测试了以下三种ICB处理策略：计算每个GLONASS信号信道的ICB，计算每个GLONASS卫星的ICB和忽略ICB。不同策略下ICBs的行为在统计学上是稳定的。随后，使用不同的ICB策略的时钟偏移产品进行了评估。评估表明，在估计时钟偏移时，考虑ICB是很重要的。此外，为每个GLONASS卫星估计一个ICB比为每个GLONASS信号信道估计一个ICB更好，因为使用前一种策略，与来自国际GNSS服务分析中心的产品相比，时钟偏移产品表现得更平滑，并且具有更高的精度。此外，使用基于每个全球轨道导航卫星系统卫星一个国际民用波段的时钟偏移量进行精确单点定位，具有最高的定位精度。
GLONASS clock offset estimation is affected by the inter-channel biases (ICBs) caused by frequency division multiple access technique. The effect of ICBs on joint GPS/GLONASS clock offset estimation is analyzed. An efficient approach for joint estimation of GPS/GLONASS satellite clock offset is applied to the generation of 30-s clock offset products. During the estimation, the following three ICB handling strategies were tested: calculating ICBs for each GLONASS signal channel, calculating ICBs for each GLONASS satellite and neglecting ICBs. The behavior of ICBs under different strategies was statistically stable. Subsequently, the clock offset products using different ICB strategies were evaluated. The evaluation shows that consideration of the ICB is important when estimating the clock offset. Furthermore, estimating one ICB for each GLONASS satellite is better than estimating one for each GLONASS signal channel because, with the former strategy, the clock offset products behave more smoothly and have higher accuracy compared with products from the International GNSS Service Analysis Center. In addition, precise point positioning, using clock offsets based on one ICB for each GLONASS satellite, has the highest positioning accuracy.