Coastal sea-surface wave measurements using software-based GPS reflectometers in Lanyu, Taiwan

Lung Chih Tsai, Shin Yi Su, Hwa Chien, Chao Han Liu, Harald Schuh, Jens Wickert, Mohamad Mahdi Alizadeh

Research output: Contribution to journalArticlepeer-review

Abstract

A low-cost transportable software-based global positioning system reflectometry (GPS-R) scheme, which can measure sea-surface wave frequency, period, and speed, is proposed and described. We designed and implemented an appropriate software receiver to acquire and track GPS-R L1-band C/A code signals in near real time. At Lanyu, Taiwan, a research platform has been built with two software-based GPS-R receivers overlooking the seas in the east-northeast and southwest directions. Additionally, we propose applying the maximum entropy method for the spectral analyses of recorded time series of GPS-R signal acquisition data and derive the mean frequencies, periods, and speeds of random sea-surface waves. The derived sea-surface wave frequencies have been compared and validated against buoy measurements and Weather Research and Forecasting (WRF) model data around Lanyu Island. The results show that the buoy wave heights and the modeled WRF wave heights have linear correlation coefficients of 0.64 and 0.47, respectively, with the GPS-R wave frequency measurements. The observed coastal sea area has a maximum horizontal distance of approximately 20 km from station Lanyu (22.037°N, 121.559°E). Thus, the corresponding mapping products of the sea-surface wave period and speed are presented with wave propagation footprints of the first Fresnel zone sizes.

Original languageEnglish
Article number133
JournalGPS Solutions
Volume25
Issue number4
DOIs
StatePublished - Oct 2021

Keywords

  • GNSS reflectometry
  • GPS L1-band C/A code signal acquisition
  • Random sea-surface wave measurement
  • Software-based GPS/GNSS receiver

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