A crossover adjustment for improving sea surface height mapping from in-situ high rate ship-borne GNSS data using PPP technique

Jinyun Guo*, Zhenghua Dong, Zhengguang Tan, Xin Liu, Chuanfa Chen, Chein-way Hwang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Ship-borne global navigation satellite system (GNSS) technique can overcome the weakness of satellite altimetry and tide gauge in measuring sea surface heights (SSHs) over coastal seas. Ship-borne GNSS technique can be used to calibrate SSHs determined by the satellite altimetry and tide gauge. The ship-borne GNSS data are processed with the single-epoch precise point positioning (PPP) method to estimate SSHs which are filtered by the Gaussian filter to weaken and/or remove effects of sea wind and wave field. Tidal corrections are also taken into consideration to improve SSHs. One crossover adjustment method is put forward to calculate the bias and drift along the ship route and assess the accuracy of SSHs. We processed the in-situ ship-borne GPS data over the offshore sea around Keelung to compute precisely SSHs with the single-epoch PPP. Statistical results of SSH differences of crossover points indicate that the root mean squares error of SSHs determined by the ship-borne GPS is up to level of 12.9 cm over the offshore sea ~30 km far away to land.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalContinental Shelf Research
Volume125
DOIs
StatePublished - 15 Aug 2016

Keywords

  • Crossover point adjustment
  • Offshore sea surface height
  • Ship-borne GNSS
  • Single-epoch precise point positioning
  • Tidal correction

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