BeiDou GNSS Buoy Positioning for Low-Cost Real-Time Sea Surface Measurement
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Solution Overview
Problem
Existing GNSS-based sea surface measurement methods face high communication and service costs due to the need for real-time data transmission and additional differential correction services, limiting their application to offshore and distant-sea scenarios, and they struggle with low real-time positioning accuracy and high costs in achieving centimeter-level precision.
Innovation Solution
A BeiDou/GNSS-based method using a dual-frequency GNSS receiver and PPP-B2b service to perform real-time precise point positioning, calculating sea surface parameters directly on the buoy without additional differential correction services, utilizing broadcast ephemeris and satellite signals to achieve centimeter-level accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time data transmission and additional differential correction services are used to achieve high positioning accuracy, then measurement precision is improved, but communication cost and service cost increase significantly
Solution Approach 1:
The buoy performs autonomous precise point positioning calculations using onboard computational resources and freely available satellite broadcast ephemeris data, eliminating the need for external differential correction services and reducing communication dependencies. The system processes GNSS observation data locally to achieve centimeter-level positioning accuracy independently.
Solution Approach 2:
The system uses freely available broadcast ephemeris data from GNSS satellites as a substitute for expensive differential correction services. By utilizing publicly accessible satellite orbit and clock information, the buoy achieves high-precision positioning without requiring paid correction data streams or continuous communication with shore-based reference stations.
2Measurement precision
If all buoy GNSS observations are sent back to data processing center for real-time calculation, then positioning accuracy is improved, but communication bandwidth requirement increases
Solution Approach 1:
The data processing function is extracted from the remote data processing center and relocated to the buoy itself. The buoy contains onboard computational capabilities that perform precise point positioning calculations locally, eliminating the need to transmit large volumes of raw GNSS observation data to shore-based processing centers and reducing communication bandwidth requirements.
Solution Approach 2:
The buoy autonomously processes its own GNSS observation data using onboard computational resources to generate positioning results. This self-processing approach eliminates the need for continuous data transmission to external processing centers, reducing communication bandwidth consumption while maintaining high positioning accuracy.
3Stability of the object's composition
If additional devices such as floating blanket, control system, and power supply system are mounted to stabilize GNSS antenna, then antenna level stability is improved, but device complexity increases
Solution Approach 1:
The complex stabilization system including floating blankets, inflatable boats, and additional control systems is removed. The invention achieves antenna level stability through the buoy's inherent design characteristics and simple mechanical structure, eliminating the need for elaborate stabilization mechanisms while reducing overall system complexity.
Solution Approach 2:
The system replaces expensive and complex stabilization equipment with a simple, cost-effective buoy design that achieves sufficient antenna stability through its basic floating structure. The solution accepts minor short-term fluctuations in exchange for dramatically reduced system complexity and cost.
Data Source
AI summary
A Beidou/GNSS-based real-time high-precision sea surface measurement method and a buoy, wherein by using free-to-use broadcast ephemeris freely broadcast by GNSS satellites, precise point positioning of China's Beidou satellites, and other high-precision service space signals, real-time centimeter-level element information comprising time, longitude, latitude, water level, wave height, wave period, wave direction, sea surface current velocity and direction, atmospheric water vapor content, and the like can be directly obtained. The information can be stored locally in a buoy or transmitted back by communication, and is suitable for real-time high-precision sea surface measurements in offshore and far-sea scenarios.