Tide level measuring method based on SNR (signal to noise ratio) data of continuously operating GNSS (global navigation satellite system) station

Abstract

The invention provides a tide level measuring method based on SNR (signal to noise ratio) data of a continuously operating GNSS (global navigation satellite system) station. The method comprises the following steps: establishing an interference model for a direct signal of a shore-based GNSS station and a right-handed circular polarization reflected signal after reflection by sea surface; generating an SNR data file according to a standard RINEX file to obtain SNR data waveforms; performing fitting processing on the SNR data waveforms with the interference model to obtain the height of an effective reflecting surface of each GNSS satellite in each rising or falling process; performing summation on the height of the effective reflecting surface obtained in each rising or falling process of each GNSS satellite in a predetermined period and sea surface height obtained by a tide level measuring instrument, and taking an arithmetic mean value to obtain the mean height between the phase center of an GNSS antenna and the zero-meter sea surface; calculating the difference between the mean height of the phase center of the GNSS antenna away from the zero-meter sea surface and the height of the effective reflecting surface of each GNSS satellite in the rising or falling process to obtain the tide level. The tide level measuring method is simple, and measuring results are accurate.

Description

Technical field [0001] The invention relates to a method for measuring tide level, in particular to a method for measuring tide level based on signal-to-noise ratio data of continuously operating GNSS stations, belonging to the field of marine hydrology. Background technique [0002] Tide level is the basic element of ocean hydrology and one of the main parameters that most intuitively reflect the ocean conditions in ocean data. Coastal tide level changes are directly related to ships entering and leaving ports, marine and coastal engineering design, tidal flat reclamation, tidal power generation, etc. The determination of average sea level and depth datum level, tide table making, storm tide forecast, earthquake forecast, etc. also require tide level data as in accordance with. [0003] Different tide level measurement methods are suitable for different measurement environments and purposes, and have their own limitations. For example, the water gauge measurement method has a low...

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Problems solved by technology

[0005] but, It is difficult to lock the reflected signal when the wind speed is high and the sea surface is rough, and two sets of GPS equipment will increase the cost; the method of Larson et al. is cumbersome to process SNR data, and the cumulative error in the final result is large; Rodriguez-Alvarez The methods such as require special GPS receiving equipment, and cannot take advantage of the widely existing continuous operation GNSS station network for measuring crustal movement, thus limiting the wide-scale application and promotion

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