Determination of optimum parameters for measuring sea level using GNSS Interferometric Reflectometry: A Case study of Port Klang, Malaysia

Abstract

This paper presents a new approach of measuring sea level height using Global Navigation Satellite Systems GNSS Interferometric Reflectometry (GNSS-IR) by method of Signal to Noise Ratio (SNR) data analysis from a single geodetic receiver. The study location was selected at Port Klang Tide Gauge (PKTG) station, Malaysia. The purpose of this study was to identify the optimum criteria for the parameters involved to get the best accuracy of reflected heights. The accuracy of reflected height derived from SNR information is strongly dependent on the value of parameters used for quality control. The parameters involved shall achieve the best possible frequency correlated with the sea surface. There are 5 parameters were identified such as estimation of the satellite's azimuth and elevation angle, identify noise frequency range, selection of frequency amplitude power, and calculation of the peak frequency to noise ratio using the Lomb-Scargle periodogram (LSP). The optimum value of each parameter is important to get accurately selected reflector heights and then produce a quality local sea level time series.