共查询到18条相似文献,搜索用时 203 毫秒
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南京主城区MapInfo数据在车载GPS导航中的应用 总被引:1,自引:0,他引:1
南京主城区地理数据库系统应用在车载GPS导航系统中,具有十分广泛的作用。主要介绍了在MapInfo平台上组建南京主城区地理信息系统的方法及其在车载GPS导航中的应用。 相似文献
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HYPACK导航系统在海洋资源勘探中的应用 总被引:3,自引:0,他引:3
介绍了HYPACK综合导航系统的功能特点、系统配置、操作方法及在海洋勘探中的应用。同时对该系统在运行中可能面对的问题,如差分GPS信号不稳定时采取的措施并对勘探取样中导航定位的难点逐一加以描述,提出行之有效的解决方法。 相似文献
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长河二号导航系统(国外称罗兰—C系统)是我国耗资数亿元引进建设的大型、远程、高精度无线电导航系统。在不能完全依赖美方控制的GPS导航系统状况下,建设和维护使用好我国自主控制的“长河二号导航系统”具有十分重要意义。 ACCUFLX6500固态发射机是长河二号导航 相似文献
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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
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Abstract During May 1985, a comprehensive GPS and acoustic navigation data set was collected off the Monterey, California coast. Three types of GPS units, a LORAN‐C, and a Miniranger operated concurrently with an OCEANO acoustic system to resolve state‐of‐the‐art accuracies for at‐sea geodetic positioning. This report details the acoustic system which displayed baseline errors of only ±0.25 m over distances to 2600 m. Unfiltered point‐to‐point acoustic navigation errors had a standard deviation of ± 1.25 m, which included ship motion errors in addition to surveying errors. Ninety percent of the stations had navigation standard deviations below ±0.75 m The experiment showed that sub‐meter acoustic surveying is the state‐of‐the‐art. 相似文献
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This paper reports the development and experimental evaluation of two in situ least squares techniques for estimating the alignment matrix of Doppler sonars commonly used for precision navigation of oceanographic submersibles. Most previously reported methods addressed the problem of single degree-of-freedom heading alignment using bottom-lock Doppler sonar data and global positioning system (GPS) navigation data. This paper reports and evaluates two techniques for three degree-of-freedom calibration of attitude and Doppler sonar sensors using sensor data available to vehicles at full ocean depth. The first technique provides a general linear least squares estimate of the alignment matrix. The second technique results in a least squares alignment matrix estimate constrained to the group of rotation matrices. The performance of these estimates is evaluated with a laboratory remotely operated vehicle (ROV) and a field-deployed autonomous underwater vehicle (AUV). Experimental results are reported which demonstrate that Doppler navigation employing the reported alignment calibration techniques significantly improves navigation precision. The experiments show that the latter technique provides calibration estimates that improve Doppler navigation precision not only on the calibration data set itself, but also provide improved precision over a wide variety of vehicle trajectories other than the calibration data set. 相似文献
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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
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