What is the accuracy of DGPS?
What is the accuracy of DGPS?
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DOI：
10.1017/s037346330500322x
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发表时间：
2005-05-01
影响因子：
2.4
通讯作者：
Hill, C
中科院分区：
文献类型：
--
作者：
Monteiro, LS;Moore, T;Hill, C
一般来说，参考站计算差分校正，该差分校正在该特定历元（校正年龄为零）对该精确位置（零基线）有效。然而，DGPS用户可能位于远离参考站200 nm的地方，并且参考站补偿的一些误差随空间而变化，即卫星星历、对流层和电离层误差。因此，随着间隔距离的增加，在基准站计算的校正值会出现一定的精度下降，因为基准站数据与用户的相关性会降低。误差随着与信标距离的增加而增加，这是由于基准站和用户无法看到相同的卫星，通常称为缺乏通视性。随着距离的误差增长是决定DGPS精度的最重要因素，但令人惊讶的是，很少有人做评估it. US官方文件和IALA的状态，可实现的精度下降约1米，每150公里（80纳米）的距离从广播网站，但这个值是基于理论预测，早在1993年。为了估计具有真实的数据的误差增长，在南-北方向上，沿沿着葡萄牙海岸线以大约50 nm的间隔从萨格雷广播站放置6个DGPS接收器。本文介绍了试验的结果。
In general, a Reference Station calculates differential corrections which are valid for that exact location (zero baseline) at that particular epoch (age of corrections zero). However, DGPS users may be located as far as 200 nm away from the Reference Station and some of the errors compensated for by the Reference Station vary with space, namely satellite ephemeris, tropospheric and ionospheric errors. Therefore, the corrections calculated at the Reference Station suffer certain accuracy degradation as the separation distance increases, because of a decreasing relevance of the Reference Station data to the user. The error growth with increasing distance to the beacon is accentuated by the inability of Reference Station and user to see the same satellites, commonly termed the lack of intervisibility. The error growth with distance is the most important factor determining DGPS accuracy, but surprisingly very little has been done to assess it. US official documents and IALA state that the achievable accuracy degrades at an approximate rate of I m for each 150 km (80 nm) distance from the broadcast site, but this value is based on a theoretical prediction, made back in 1993. To estimate the error growth with real data, 6 DGPS receivers were placed along the Portuguese coastline at approximately 50 nm intervals from Sagres Broadcast Station, in a South - North direction. This paper describes the results of the trial.