Satellite Navigation Receiver Seamless RTK to Precise Positioning Mode Switching
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Solution Overview
Problem
Satellite navigation receivers experience abrupt transitions and reduced accuracy when switching between real-time kinematic (RTK) mode and precise positioning mode due to RTK signal interruptions, limiting outage periods and requiring improved seamless switching methods.
Innovation Solution
The system employs a satellite navigation receiver capable of processing RTK correction data and precise positioning data to determine offset vectors, allowing for smooth transitions between modes and extended outage periods by using RTKX mode, which includes a quality evaluator and mode controller to select appropriate offset vectors from various sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver transitions from RTK mode to precise positioning mode due to RTK signal interruption, then the receiver can continue providing position estimates, but the transition causes abrupt jumps or discontinuities in position and accuracy is reduced
Solution Approach 1:
The patent introduces an intermediary mechanism (offset vector calculation and application) between RTK mode and precise positioning mode to bridge the two positioning methods. By calculating offset vectors from precise positioning solutions and applying them to compensate position jumps, the system smoothly transitions between modes while maintaining accuracy, resolving the contradiction between reliability and measurement precision.
2Measurement precision
If the receiver limits the maximum time period for RTK signal outage to maintain accuracy, then position accuracy is preserved during brief outages, but the receiver cannot support extended outage periods
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing offset vectors from precise positioning solutions during periods when RTK signal is available. These pre-computed offset vectors are then retrieved and applied during extended outages, allowing the receiver to maintain accuracy without requiring continuous RTK signal, thus supporting extended outage periods while preserving position accuracy.
3Reliability
If the receiver switches to a location-determining mode with reduced accuracy after maximum outage time, then the receiver can continue providing position estimates, but accuracy is significantly reduced
Solution Approach 1:
The patent implements feedback by continuously monitoring RTK signal availability and dynamically adjusting the positioning mode based on signal conditions. The system uses feedback from precise positioning solutions to calculate and apply offset vectors that compensate for position jumps, allowing the receiver to maintain high accuracy even during extended outages without resorting to reduced accuracy modes, thus preserving both reliability and measurement precision.
Data Source
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AI summary
A system or method uses an offset vector to provide seamless switching between a real-time kinematic (RTK) mode and a precise positioning mode. A correction wireless device (14, 114, 214) is adapted to receive, at the reference receiver (30), a precise signal encoded with precise correction data. A precise positioning estimator (120) of the reference receiver (30) is arranged to determine a precise position based on the measured carrier phase of the received satellite signals and the received precise correction data in a precise correction mode. At the reference receiver (30), an offset module (130) can determine a base offset vector between the precise position and a reference RTK position for the reference receiver (30). At the reference receiver (30), a wireless communications device (14, 114, 214) is capable of transmitting, via an RTK signal, RTK correction data.