School of Geomatics, Liaoning Technical University, Fuxin 123000, China.
Sensors (Basel). 2013 Apr 3;13(4):4514-26. doi: 10.3390/s130404514.
The GNSS derived Zenith Tropospheric Delay (ZTD) plays today a very critical role in meteorological study and weather forecasts, as ZTDs of thousands of GNSS stations are operationally assimilated into numerical weather prediction models. Recently, the Chinese BeiDou Navigation Satellite System (BDS) was officially announced to provide operational services around China and its neighborhood and it was demonstrated to be very promising for precise navigation and positioning. In this contribution, we concentrate on estimating ZTD using BDS observations to assess its capacity for troposphere remote sensing. A local network which is about 250 km from Beijing and comprised of six stations equipped with GPS- and BDS-capable receivers is utilized. Data from 5 to 8 November 2012 collected on the network is processed in network mode using precise orbits and in Precise Point Positioning mode using precise orbits and clocks. The precise orbits and clocks are generated from a tracking network with most of the stations in China and several stations around the world. The derived ZTDs are compared with that estimated from GPS data using the final products of the International GNSS Service (IGS). The comparison shows that the bias and the standard deviation of the ZTD differences are about 2 mm and 5 mm, respectively, which are very close to the differences of GPS ZTD estimated using different software packages.
GNSS 导出的天顶对流层延迟 (ZTD) 在气象研究和天气预报中发挥着非常关键的作用，因为成千上万的 GNSS 站的 ZTD 正在业务上被同化到数值天气预报模型中。最近，中国的北斗导航卫星系统 (BDS) 正式宣布在中国及其周边地区提供业务服务，并且被证明在精确导航和定位方面非常有前途。在本贡献中，我们专注于使用 BDS 观测来估计 ZTD，以评估其用于对流层遥感的能力。利用一个距离北京约 250 公里、由 6 个配备 GPS 和 BDS 接收器的站组成的本地网络。使用精密轨道在网络模式下处理 2012 年 11 月 5 日至 8 日收集的数据，使用精密轨道和时钟在精密点定位模式下处理。精密轨道和时钟是由一个跟踪网络生成的，该网络在中国的大部分站和全球的几个站都有。所得到的 ZTD 与使用国际 GNSS 服务 (IGS) 的最终产品从 GPS 数据估计的 ZTD 进行了比较。比较表明，ZTD 差异的偏差和标准偏差约为 2 毫米和 5 毫米，分别与使用不同软件包从 GPS ZTD 估计的差异非常接近。
