CERIM GNSS Integrity Monitoring via Wireless Ranging Collaboration
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Solution Overview
Problem
Current GNSS integrity monitoring systems face challenges in detecting satellite faults quickly and accurately, especially in safety-of-life navigation applications, where delays can lead to significant positioning errors and safety risks, and existing solutions like SBAS and RAIM have limitations in sensitivity and coverage.
Innovation Solution
A system of mobile GNSS receivers with wireless communication capabilities, performing Collaboration-Enhanced Receiver Integrity Monitoring (CERIM) by sharing ranging measurements and using fault detection algorithms to quickly identify satellite faults, providing fast and sensitive integrity verification without fixed infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SBAS is used for integrity monitoring, then sensitivity is improved, but alert time increases due to indirect communication path causing delay
Solution Approach 1:
The patent uses geostationary satellites as intermediaries to transmit integrity monitoring data directly to users, eliminating the need for ground-based master stations and reducing communication delays while maintaining high sensitivity through continent-scale receiver networks
Solution Approach 2:
The patent transitions from ground-based to space-based communication by using geostationary satellites, adding a spatial dimension to the integrity monitoring system that enables direct satellite-to-user communication and reduces alert time
2Loss of time
If RAIM is used for integrity monitoring, then alert time is reduced, but sensitivity decreases due to single receiver measurements
Solution Approach 1:
The patent combines measurements from multiple distributed receivers across a continent-scale network, merging their data to achieve both fast alert times and high sensitivity by processing measurements from many receivers simultaneously
Solution Approach 2:
The patent creates a universal integrity monitoring system that can serve multiple users across large geographic areas simultaneously, with each receiver contributing to the collective detection capability while maintaining individual autonomy
3Measurement precision
If GBAS is used for integrity monitoring, then both sensitivity and alert time are improved, but coverage area is limited to localized regions
Solution Approach 1:
The patent divides the coverage area into multiple overlapping zones served by different geostationary satellites, allowing each satellite to handle a specific region while collectively providing continent-scale or global coverage
Solution Approach 2:
The patent expands from local ground-based coverage to continent-scale or global coverage by utilizing geostationary satellites in space, adding a spatial dimension that enables wide-area service without requiring dense ground infrastructure
4Reliability
If ground segment monitoring is used, then system health is maintained, but fault detection is delayed due to status indicator lag
Solution Approach 1:
The patent performs preliminary integrity monitoring by continuously collecting and processing measurements from multiple receivers before faults can cause significant positioning errors, enabling early detection and alerting users proactively
Solution Approach 2:
The patent implements real-time feedback by continuously monitoring satellite signals through distributed receivers and immediately alerting users when anomalies are detected, creating a closed-loop system that responds dynamically to changing conditions
Data Source
AI summary
Systems and methods are disclosed herein for verifying the quality of global navigation satellite system (GNSS) measurements. The system includes a GNSS receiver, a wireless communications device, and a fault detection processor. The GNSS receiver includes a GNSS antenna for receiving signals from a plurality of global navigation satellites and a processor for calculating a ranging measurement for each of the global navigation satellites from the GNSS receiver to the global navigation satellite. The wireless communications device receives ranging measurements from at least one other GNSS receiver. The fault detection processor performs a fault detection algorithm to determine if there is an anomaly affecting the ranging measurements of the GNSS receiver and the at least one other GNSS receiver.