Multi-Constellation GNSS Augmentation via Reference Station Integrity Monitoring
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Solution Overview
Problem
Multi-constellation global navigation satellite systems (GNSS) face challenges such as low signal availability due to blockages, reliability concerns with foreign systems, susceptibility to spoofing, and interference, which affect navigation accuracy and availability, especially in urban areas.
Innovation Solution
A system comprising reference stations that monitor and analyze integrity and performance data from multiple GNSS, transmitting augmentation and assistance information to user navcom equipment via an operation center, enabling reliable navigation data from multiple satellite systems, including foreign-owned systems like Glonass, Galileo, and Compass, and providing differential corrections and integrity verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-constellation GNSS is used to increase the number of available satellites, then availability and performance are improved, but reliability and susceptibility to spoofing increase
Solution Approach 1:
A ground-based reference station system acts as an intermediary between multiple GNSS constellations and the user receiver. The reference stations monitor signal integrity, verify authenticity, and provide correction data that filters out spoofed signals before they reach the user, enabling safe use of multiple constellations including foreign systems
Solution Approach 2:
The system implements continuous feedback loops where reference stations monitor GNSS signals, analyze integrity metrics, and transmit correction/verification data back to user receivers in real-time. This feedback mechanism enables dynamic verification of satellite signal authenticity and ongoing detection of spoofing attempts across all monitored constellations
2Ease of operation
If GPS signals are used in urban areas, then navigation is provided, but signal blockage by structures reduces availability
Solution Approach 1:
The system merges data from multiple independent GNSS constellations (GPS, Glonass, Galileo, Compass) to provide redundant positioning solutions. When GPS signals are blocked in urban canyons, the combined multi-constellation data maintains sufficient satellite visibility for continuous navigation operation
Solution Approach 2:
Ground-based reference stations perform preliminary signal verification and correction before data reaches user receivers. By pre-processing signals and removing problematic components at the reference station level, the system ensures that only validated navigation data is transmitted to users, maintaining reliability even when satellite visibility is marginal
3Productivity
If foreign GNSS systems are used to multiply the number of satellites, then availability is improved, but susceptibility to spoofing and interference increases
Solution Approach 1:
The reference station system serves as a trusted intermediary that verifies the authenticity of signals from all GNSS constellations before they are used for positioning. The ground-based infrastructure validates foreign satellite signals against known ephemeris data and integrity metrics, filtering out spoofed signals at the source rather than requiring verification at each user receiver
Solution Approach 2:
The system enables user receivers to self-verify signal authenticity by providing them with reference data and integrity verification tools. Users can independently assess the reliability of received signals from multiple constellations using correction data and integrity indicators transmitted by the reference station network
Data Source
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AI summary
A multi-constellation GNSS augmentation and assistance system may include a plurality of reference stations. Each reference station may be adapted to receive navigation data from a plurality of different global navigation satellite systems and to monitor integrity and performance data for each different global navigation satellite system. An operation center may receive the integrity and performance data transmitted from each of the plurality of reference stations. A communication network may transmit a message from the operation center to navcom equipment of a user for augmentation and assistance of the navcom equipment.