Wi-Fi Beacon Frame Transmission of GNSS Correction Data
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Solution Overview
Problem
Current methods for communicating real-time kinematic (RTK) corrections from base stations to GNSS receivers are limited by the need for frequency coordination, licensing requirements, and the inability to operate in all geographic areas, as well as requiring secure authentication and association with a single base station.
Innovation Solution
The use of Wi-Fi beacon frames to transmit GNSS correction data, which eliminates the need for frequency allocation and licensing, allows for connectionless delivery, and enables operation in the Industrial, Scientific and Medical (ISM) bands, allowing multiple base stations to synchronize and transmit correction data to a rover without the need for secure authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional frequency-coordinated methods are used to transmit correction data, then reliable communication is achieved, but frequency allocation and licensing requirements limit operational flexibility and geographic coverage
Solution Approach 1:
The patent uses Wi-Fi beacon frames as an intermediary communication vehicle to transmit RTK correction data. Instead of using dedicated frequency-coordinated channels, the correction data is embedded within standard Wi-Fi beacon frames that operate in unlicensed ISM bands, eliminating the need for frequency allocation while maintaining reliable data delivery through the structured beacon frame format
Solution Approach 2:
The patent makes the Wi-Fi beacon frame serve multiple functions: it continues to provide standard Wi-Fi network identification and synchronization functions while simultaneously carrying RTK correction data in its information elements. This multi-functionality allows the same communication infrastructure to serve both wireless networking and precision positioning purposes without requiring separate dedicated channels
2Adaptability or versatility
If secure authentication and association with a single base station are required, then data security is improved, but the system cannot support multiple base stations and connectionless delivery
Solution Approach 1:
The patent extracts the authentication and association requirements from the communication protocol. By placing correction data in Wi-Fi beacon frames, the system eliminates the need for rover-to-base-station authentication handshakes and continuous association maintenance, allowing any rover within range to receive corrections from any transmitting base station without secure connection establishment
Solution Approach 2:
The beacon frame-based system allows base stations to autonomously transmit correction data without requiring rover initiation or authentication requests. The rovers independently receive and process beacon frames from multiple base stations without needing to establish secured connections, enabling self-service operation that supports multiple base stations simultaneously
Data Source
AI summary
Techniques for transmitting global navigation satellite system (GNSS) correction data to a rover. GNSS signals are wirelessly received by a base station from one or more GNSS satellites. GNSS correction data is generated by the base station based on the GNSS signals. A beacon frame is formed by the base station to include a frame header, a frame body, and a frame check sequence (FCS). The frame body is formed to include the GNSS correction data. The beacon frame is wirelessly transmitted by the base station for receipt by the rover. The rover wirelessly receives the beacon frame. The GNSS correction data is extracted by the rover from the beacon frame. A geospatial position of the rover is calculated based on the GNSS correction data.