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Handheld GPS Receiver Accuracy

机译:手持式GPS接收器精度

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摘要

Officially, the Global Positioning System has two levels of service: the Precise Positioning Service (PPS) which is afforded to the United States military, allied military forces and some other U.S. government agencies, and the Standard Positioning Service (SPS), available to all users worldwide. Currently, the SPS is provided by way of the Coarse/Acquisition (C/A) 1.023 megachip per second pseudorandom noise (PRN) code on the GPS L1 frequency at 1575.42 MHz. The vast majority of GPS receivers now in existence, including virtually all civil-use handheld receivers, are SPS receivers which determine their positions by tracking the L1 C/A-code. SPS policy initially dictated a predictable positioning accuracy of 100 meters, at the 95 percent confidence level, horizontally and 156 meters (95 percent) vertically. SPS positioning accuracy was purposely degraded to this level through the use of Selective Availability (SA). When SA was removed on May 2, 2000, SPS accuracy improved greatly, approaching that of the PPS.
机译:正式地,全球定位系统提供两个级别的服务:向美国军队,盟军和其他一些美国政府机构提供的精确定位服务(PPS),以及向所有人提供的标准定位服务(SPS)全球用户。当前,SPS是通过在1575.42 MHz的GPS L1频率上以粗略/获取(C / A)1.023兆码/秒的伪随机噪声(PRN)码提供的。现在存在的绝大多数GPS接收器,包括几乎所有民用手持式接收器都是SPS接收器,它们通过跟踪L1 C / A代码来确定其位置。 SPS策略最初要求水平(水平95%)和垂直156米(95%)时可预测的定位精度为100米。通过使用选择性可用性(SA),SPS的定位精度故意降低到了这一水平。 2000年5月2日删除SA后,SPS准确性大大提高,接近PPS。

著录项

  • 来源
    《GPS World》 |2003年第2期|p.46-51|共6页
  • 作者

    Christian Tiberius;

  • 作者单位

    Department of Geodesy at the Delft University of Technology (TU Delft) in Delft, The Netherlands;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 测绘学;
  • 关键词

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