Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue 7: 795 - 802

DOI: https://doi.org/10.11947/j.AGCS.2016.20150638

Improved Water Level Retrieval from Epoch-by-Epoch Single and Double Difference GNSS-R Algorithms

  • WANG Nazi ,
  • BAO Lifeng ,
  • GAO Fan
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  • 1. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of Space Science, Shandong University, Weihai 264209, China

Received date: 2015-12-18

  Revised date: 2016-04-07

  Online published: 2016-07-28

Supported by

The National Natural Science Foundation of China(Nos.41321063;41274050;41374021)

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Abstract

GNSS-R is a new technology for monitoring the water level with high efficiency. Compared with conventional water level measurement technique, such as satellite altimetry and tide gauges, GNSS-R can observe more reflected points with high temporal and spatial resolution and unaffected by the influence of the plate vertical motion. This paper presented an improved cGNSS-R altimetry algorithm based on single difference to derive the reflector heights epoch-by-epoch, which can enhance the temporal and spatial resolution of surface height measurements, furthermore, the other algorithm based on the double differenced carrier phase measurements was also presented in this paper. By using the observed data of cGNSS-R altimetry experiment conducted on Qinghe bridge of East Lake, Wuhan, the reflector heights between the reflected antenna and the lake surface were given to prove the above mentioned algorithms, and the precision were ±2~±4 cm. The results show that the proposed algorithms based on single and double difference which are used for water level retrieval can sufficiently decrease the influences due to clock error, ionospheric and tropospheric error.

Key words： global navigation satellite system reflectometry (GNSS-R); reflected signals; single difference; double difference; water level height

Cite this article

WANG Nazi , BAO Lifeng , GAO Fan . Improved Water Level Retrieval from Epoch-by-Epoch Single and Double Difference GNSS-R Algorithms[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(7) : 795 -802 . DOI: 10.11947/j.AGCS.2016.20150638

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