Wave and tide inversion algorithm based on GNSS technology

Abstract

Along with the construction and development of Global Navigation Satellite System (GNSS) technology, GNSS has been widely and increasingly used in the ocean field, such as offshore wind retrieval, sea ice observation, sea state monitoring et al. Researchers from National Ocean Technology Center take advantage of GNSS satellites signal Doppler shift to measure the buoy state, then inverse the wave spectrum, and calculate the wave characteristic values; Furthermore, GNSS receiver and GNSS Ground-based Augmentation System (GBAS) is used to measure the real-time height of the buoy, then the tide data is extracted through a low-pass filter and a tide revised. Presently, both of the inversion algorithms have passed the laboratory and field test, the results are summarized as follows: the measured wave data is in good consistency with the reference instruments and the tide accuracy of measurement can arrive at centimeter-level. Recently, researchers are concentrating on further improvement of simultaneous inversion algorithm.