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首页> 外文会议>Saint Petersburg International Conference on Integrated Navigation Systems; 20040524-26; Saint Petersburg(RU) >REAL-TIME KINEMATIC POSITIONING WITH NASA'S INTERNET-BASED GLOBAL DIFFERENTIAL GPS (IGDG)
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REAL-TIME KINEMATIC POSITIONING WITH NASA'S INTERNET-BASED GLOBAL DIFFERENTIAL GPS (IGDG)

机译：使用NASA基于互联网的全球差分GPS（IGDG）进行实时运动定位

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摘要

The Global Differential GPS (GDGPS) system developed by JPL aims at seamless global real-time positioning at the dm accuracy level for dual-frequency receivers either static or mobile, anywhere and at any time. The GDGPS system relies on GPS data transmitted in real-time to a central processing center at JPL from a global network of permanently operating GPS dual-frequency receivers. At the processing center, the Internet-based Global Differential GPS (IGDG) system, the heart of JPL's GDGPS, generates and disseminates over the open Internet special 1-second global differential corrections (IGDG corrections) to the GPS broadcast ephemerides. The IGDG corrections enhance the accuracy of GPS broadcast orbits and clocks down to the dm level and are the key-factor in high-precise real-time positioning of a stand-alone receiver. An independent experimental verification of the dm positional accuracy of IGDG system was carried out, by means of both a static and a kinematic test in the Netherlands. In the static test, the means of the position coordinates, taken over individual days of data, agree with the known reference at the 1-2 cm level confirming that the IGDG position solutions are free of systematic biases. The standard deviation of individual real-time position solutions turned out to be 10 cm for the horizontal components and 20 cm for the vertical component. In the kinematic test, carried out with a small boat, the means of coordinate differences with an accurate ground-truth trajectory, are at 1-2 dm level over the almost 3 hour period; the standard deviations of individual positions were similar to values found in the static test, 10 cm for the horizontal components, and 20 cm for the vertical component. More than 99% of the IGDG-corrections were received in the field with the nominal interval of 1 second, using a GPRS cellular phone. The latency of the corrections was generally 7 to 8 seconds.
机译：JPL开发的全球差分GPS（GDGPS）系统旨在以dm精度无缝无缝全球实时定位，无论何时何地都可以为静态或移动双频接收器提供服务。 GDGPS系统依赖于GPS数据，该数据是从永久运行的GPS双频接收机的全球网络实时传输到JPL的中央处理中心的。在处理中心，基于互联网的全球差分GPS（IGDG）系统是JPL GDGPS的核心，它通过开放的Internet生成并向GPS广播星历表分发特殊的1秒钟全球差分修正（IGDG修正）。 IGDG校正可将GPS广播轨道和时钟的精确度提高到dm级，并且是独立接收器高精度实时定位的关键因素。通过在荷兰的静态和运动学测试，对IGDG系统的dm位置精度进行了独立的实验验证。在静态测试中，在每一天的数据中获取的位置坐标均值与1-2厘米级别的已知参考值一致，从而确认IGDG位置解没有系统性偏差。各个实时位置解的标准偏差水平分量为10 cm，垂直分量为20 cm。在用小船进行的运动学测试中，在近3小时的时间内，具有精确的地面真实轨迹的坐标差的平均值为1-2 dm；各个位置的标准偏差与静态测试中的值相似，水平分量为10厘米，垂直分量为20厘米。使用GPRS蜂窝电话，在野外以1秒的标称间隔接收了超过99％的IGDG校正。校正的等待时间通常为7到8秒。

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