A comparotive study of GPS P3 and GPS L3

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI:10.1109/FREQ.2005.1574016

Gun Li, Bian Li, S. Dong

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引用次数: 3

Abstract

More recently, GPS carrier phase measurement using geodetic receivers is widely conducted for accurate time and frequency comparisons. Time transfer experiments were conducted using the Ashtech Z12T receivers whose internal frequency is provided by an external 20 MHz clock and an external 1 pps (pulse per second) of a reference clock. The results of time comparison has shown that the stability of time transfer using carrier phase is better than that of GPS common-view time transfer using GPS C/A or P3. The self-developed processing software was used to the cycle slip detection and ambiguity resolution determination. The objective of this paper is to compare the GPS P3 and GPS L3 time transfer. The GPS P3 and L3 data have been obtained using an Ashtech Z12T at NTSC and an Ashtech ZIIX3 at NICT. The main results and analysis are given in Section 3 and Section 4. For a long baseline comparison, the RMS of L3 is better than that of P3. The stability of frequency of L3 is better than that of P3 for short term tau>6d, however, for tau< 6d the stability of L3 and P3 is almost at the same level

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GPS P3与GPS L3的比较研究

最近，GPS载波相位测量使用大地测量接收机被广泛用于精确的时间和频率比较。时间传递实验使用Ashtech Z12T接收机进行，其内部频率由外部20 MHz时钟和外部1 pps(脉冲每秒)参考时钟提供。时间对比结果表明，利用载波相位进行时间传递的稳定性优于利用GPS C/A或P3进行GPS共视时间传递的稳定性。采用自行开发的处理软件进行周跳检测和模糊度分辨。本文的目的是比较GPS P3和GPS L3的时间传递。GPS P3和L3数据是使用NTSC的Ashtech Z12T和NICT的Ashtech ZIIX3获得的。第三节和第四节给出了主要结果和分析。在长基线比较中，L3的RMS优于P3。短期tau>6d时，L3的频率稳定性优于P3，但在tau< 6d时，L3与P3的稳定性基本相同

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Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.

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