共查询到16条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
随着北斗卫星导航系统的建成与运行,目前已形成多系统导航定位的局面。基于短基线,首先对密林地区的GPS、BDS、GLONASS的卫星可见性以及伪距观测值的质量进行了简单的评价,然后分析了密林地区GPS、BDS、GLONASS单系统、双系统及三系统组合模式下单点定位及伪距差分定位性能。结果表明:在密林地区,GNSS多系统组合能够明显提高定位精度,GPS/BDS组合定位的精度优于GPS/GLONASS、BDS/GLONASS组合,而GPS/BDS/GLONASS的定位精度最高。 相似文献
5.
6.
7.
8.
9.
北斗二代卫星导航系统定位精度分析方法研究 总被引:5,自引:0,他引:5
卫星导航系统的定位精度主要受观测量的精度和卫星的空间几何分布两方面的影响,GPS等相同轨道分布的卫星导航系统一般采用几何精度因子(GDOP)来分析定位精度。我国的北斗二代卫星导航系统是由三类异质卫星组成的混合星座导航系统,不同轨道卫星定轨误差不同,用户所得到的观测量精度也不相同,因此精密定位精度计算和分析时必须要考虑这种差异。引入了加权几何精度因子(WGDOP),利用模拟观测数据对北斗二代卫星导航系统的定位精度进行了分析。外部检核计算结果表明,精密定位计算时顾及观测量精度差异可进一步提高定位精度。 相似文献
10.
11.
12.
13.
为提高我国海洋环境监测技术水平,保障海洋环境信息安全,文章基于我国自主研发的北斗卫星导航系统,设计海洋环境监测系统。研究结果表明:基于北斗卫星导航系统的海洋环境监测系统包括北斗海洋环境监测终端和海洋信息综合服务平台2个部分,具有实时定位、实时监测、数据处理、信息预警、电子围栏、数据总览和用户管理7项功能;终端集成微控制单元和传感器等模块,平台包括服务器等硬件和数据处理等软件;经实地部署和严格测试,系统功能和性能均达到设计要求,且安全、稳定、方便和实用。 相似文献
14.
Walter J. Senus 《Marine Geodesy》2013,36(3):263-288
The current accuracy of sea‐going and airborne gravity measurements is not bounded by the precision of the gravimeter but by the precision with which external parameters such as vehicle velocity (speed), azimuthal heading, and geographic position can be determined. Uncertainties in these parameters are summed up in the Eötvös correction in the reduction of the measured data. This work investigates the suitability of baseline navigation systems, in particular Loran‐C and Omega, to further reduce the uncertainty of the Eötvös correction. Emphasis is placed on the velocity measurement error. A new algorithm is developed which derives velocity based upon the change in hyperbolic (or circular) grid readings, as opposed to the standard change in geographic position technique. A comparative analysis shows the new algorithm to be as precise as the currently used conventional calculation. Further, this simplified technique is accompanied with a 20‐fold reduction in computational complexity. Application of the results presented in this paper to the Loran‐C and Omega systems shows a velocity determination capability of 0.1 knot over a six minute integration time, and 0.05 knot for a 15 minute integration time for Loran‐C. The minimum error attainable in Omega is 0.1 knot when determined over a 17 minute measurement time. Further precision can be gleaned by applying the calculated error as a correction to subsequent velocity calculations. 相似文献
15.