Standalone GNSS Receiver Cycle-Slip Detection and Repair
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Solution Overview
Problem
Current GNSS receivers face challenges in achieving centimeter-level accuracy without relying on reference stations or network services, which are costly and complex, and often require lengthy convergence times due to limitations in error mitigation and ambiguity resolution.
Innovation Solution
A standalone GNSS receiver generates and uses reference data from a precisely surveyed coordinate to perform real-time kinematic positioning, allowing for centimeter-level accuracy by saving pseudo-range and carrier phase measurements at a reference epoch and using them for subsequent epochs, with ambiguity resolution and error mitigation techniques to maintain accuracy even after signal lock is reacquired.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference stations or reference receivers are used for position correction, then positioning accuracy is improved, but device complexity and operational costs increase
Solution Approach 1:
The rover receiver performs self-correction by detecting and repairing its own carrier-phase cycle slips using internally stored reference measurements from a precisely surveyed coordinate, eliminating the need for external reference stations or network services
Solution Approach 2:
The system creates a local copy of reference measurements (pseudo-range and carrier phase) at a precisely surveyed coordinate, which the rover uses to detect and repair cycle slips without needing continuous connection to external reference stations
2Measurement precision
If reference stations with network services are deployed, then positioning accuracy is improved, but operational costs increase
Solution Approach 1:
The rover receiver independently detects and repairs carrier-phase cycle slips using its own stored reference measurements, eliminating the need for paid network RTK services or external reference station infrastructure
Solution Approach 2:
The system uses a simple, inexpensive approach of storing reference measurements locally and performing self-correction, replacing the need for expensive continuous network services or reference station deployments
3Measurement precision
If ambiguity resolution techniques are implemented, then positioning accuracy is improved, but convergence time increases
Solution Approach 1:
The system pre-stores reference pseudo-range and carrier phase measurements at a precisely surveyed coordinate, preparing the data needed for rapid cycle slip detection and repair when signal lock is reacquired
Solution Approach 2:
The cycle slip detection and repair process identifies and corrects errors in real-time when signal lock is reacquired, rapidly restoring centimeter-level accuracy without requiring lengthy convergence periods
Data Source
AI summary
A method of determining position includes observing a first signal from a first source at a first epoch. The method includes observing a second signal from the first source at a second epoch. The method includes observing a third signal from a second source at the first epoch. The method includes observing a fourth signal from the second source at the second epoch. The method includes generating a first set of comparison data based on the first signal and the second signal. The method includes generating a second set of comparison data based on the third signal and the fourth signal. The method includes determining whether cycle-slip exists based on the first set of comparison data and the second set of comparison data. The method includes determining a current position of a standalone global navigation satellite system (GNSS) receiver in response to a determination that cycle-slip does not exist.