2018年,西藏地区新建了30个全球卫星导航系统(GNSS)连续运行参考站(CORS),安装了国产南方接收机和天线,实现了无人值守、高可靠性的实时数据采集与传输。为评估新建成的西藏CORS站运行情况,以及国产GNSS接收机的工作性能,采用数理统计...2018年,西藏地区新建了30个全球卫星导航系统(GNSS)连续运行参考站(CORS),安装了国产南方接收机和天线,实现了无人值守、高可靠性的实时数据采集与传输。为评估新建成的西藏CORS站运行情况,以及国产GNSS接收机的工作性能,采用数理统计的方法分析了新建成的西藏CORS 2019年GNSS观测数据质量,并与中国大陆构造环境监测网络工程西藏地区CORS站的数据质量进行比对。通过分析可以看出,两个CORS网观测数据质量总体上差距不大,南方SOUTH NET S9接收机的性能基本满足CORS的应用需求,但相比于天宝(Trimble)NETR8/9系列接收机,还存在一些不足,主要表现为稳定性欠佳。展开更多
When an aircraft moves under a low carrier-to-noise ratio （CNR） or at a high speed, increasing the sensitivity of global navigation satellite system （GNSS） receiver is a goal quite hard to achieve. A novel acquisi...When an aircraft moves under a low carrier-to-noise ratio （CNR） or at a high speed, increasing the sensitivity of global navigation satellite system （GNSS） receiver is a goal quite hard to achieve. A novel acquisition scheme assisted with micro-electro-mechanical-sensor （MEMS） inertial navigation system （INS） is presented to estimate the Doppler caused by user dynamics relative to each satellite ahead of time. Based on tightly coupled GNSS/INS estimation algorithm, MEMS INS Doppler error that can be achieved is first described. Then, by analyzing the mean acquisition time and signal detection probability, the MEMS INS-assisted acquisition capabilities in cold, warm and hot starts are quantitatively determined and compared with the standard GNSS acquisition capability. The simulations and comparisons have shown that： the acquisition time in cold start can be shortened by at least 23 s, the time in warm start can be shortened to i s and the acquisition capability is improved 95%, and the reaequisition time in hot start can be shortened by around 0.090 s and the capability can be enhanced 40%. The results demonstrate the validity of the novel method.展开更多
文摘2018年,西藏地区新建了30个全球卫星导航系统(GNSS)连续运行参考站(CORS),安装了国产南方接收机和天线,实现了无人值守、高可靠性的实时数据采集与传输。为评估新建成的西藏CORS站运行情况,以及国产GNSS接收机的工作性能,采用数理统计的方法分析了新建成的西藏CORS 2019年GNSS观测数据质量,并与中国大陆构造环境监测网络工程西藏地区CORS站的数据质量进行比对。通过分析可以看出,两个CORS网观测数据质量总体上差距不大,南方SOUTH NET S9接收机的性能基本满足CORS的应用需求,但相比于天宝(Trimble)NETR8/9系列接收机,还存在一些不足,主要表现为稳定性欠佳。
基金the National High Technology Research and Development Program (863) of China(No.2009AA12Z322)
文摘When an aircraft moves under a low carrier-to-noise ratio （CNR） or at a high speed, increasing the sensitivity of global navigation satellite system （GNSS） receiver is a goal quite hard to achieve. A novel acquisition scheme assisted with micro-electro-mechanical-sensor （MEMS） inertial navigation system （INS） is presented to estimate the Doppler caused by user dynamics relative to each satellite ahead of time. Based on tightly coupled GNSS/INS estimation algorithm, MEMS INS Doppler error that can be achieved is first described. Then, by analyzing the mean acquisition time and signal detection probability, the MEMS INS-assisted acquisition capabilities in cold, warm and hot starts are quantitatively determined and compared with the standard GNSS acquisition capability. The simulations and comparisons have shown that： the acquisition time in cold start can be shortened by at least 23 s, the time in warm start can be shortened to i s and the acquisition capability is improved 95%, and the reaequisition time in hot start can be shortened by around 0.090 s and the capability can be enhanced 40%. The results demonstrate the validity of the novel method.
