Assisted GPS and SBAS Hybrid Positioning System
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Solution Overview
Problem
Current GPS systems face inaccuracies and unreliability in aviation and weak signal reception due to obstructions, which existing Satellite Based Augmentation Systems (SBAS) and Assisted GPS systems address partially but not comprehensively.
Innovation Solution
A communication system integrating a mobile station and a reference station that processes GPS and SBAS signals to provide combined GPS data, including satellite almanac, ephemeris, clock error information, and ionospheric corrections, to improve positioning accuracy and signal strength, enabling better satellite error correction and integrity monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS receivers are used for aviation positioning, then positioning function is provided, but positioning accuracy and reliability are insufficient
Solution Approach 1:
The patent combines SBAS correction data with assisted GPS data to create a hybrid positioning system. The mobile station receives both SBAS correction terms and assisted GPS almanac/ephemeris data, merging these data sources to achieve both high accuracy and reliability in aviation positioning applications.
Solution Approach 2:
The system serves multiple functions simultaneously: it provides standard GPS positioning, SBAS-based differential correction, and assisted GPS functionality all through a single mobile station receiver, making the system universally applicable to various positioning needs including aviation.
2Reliability
If GPS signals are received in obstructed environments, then positioning is attempted, but signal reception is weak due to obstructions
Solution Approach 1:
The system performs preliminary actions by receiving and storing assisted GPS data (almanac, ephemeris, clock corrections) through the cellular network before GPS signal acquisition is attempted. This preliminary data preparation enables faster acquisition and more reliable positioning even when GPS signals are weak or obstructed.
Solution Approach 2:
The cellular network acts as an intermediary, delivering GPS assistance data to the mobile station when direct GPS signal reception is difficult. This intermediary data path bypasses the obstruction problem affecting direct satellite-to-receiver signals.
3Measurement precision
If SBAS correction data is used to improve accuracy, then positioning precision increases, but system complexity increases
Solution Approach 1:
The mobile station is designed with multi-functionality to handle both standard GPS processing and SBAS correction processing, as well as assisted GPS data reception. By consolidating these functions in a single integrated receiver, the system achieves high precision without proportionally increasing complexity.
Data Source
AI summary
A communication system includes a reference station and a mobile station. The reference station is operable to: receive GPS signals; generate GPS assisting data from the received GPS signals; receive SBAS signals; obtain SBAS data from the received SBAS signals; combine the GPS assisting data and the SBAS data to produce combined GPS data; and transmit the combined GPS data via a terrestrial wireless communication. The mobile station is operable to: receive the GPS signals; receive the combined GPS data via the terrestrial wireless communication; and generate positioning data from the mobile received GPS signals and the combined GPS data.