GNSS Reference Station Handover via Dual-Station Data Processing
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Solution Overview
Problem
Conventional GNSS positioning systems face interruptions and inefficiencies when the baseline between a rover and a reference station increases, leading to loss of high-accuracy navigation due to the need for time-consuming initialization with new reference stations, especially when using virtual reference stations.
Innovation Solution
The method involves receiving and processing data from both the current and new reference stations simultaneously, allowing for a smooth transition and continuous high-accuracy navigation by solving integer ambiguities for the new reference station during a short overlap period, thereby avoiding interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the baseline between rover and reference station increases, then the rover can move to new locations, but high-accuracy navigation is lost due to time-consuming initialization with new reference stations
Solution Approach 1:
The system performs preliminary actions by receiving and processing data from both current and new reference stations simultaneously before the handover is needed. The new reference station data is prepared in advance during an overlap period, so when the baseline exceeds the threshold, the transition to the new reference station can occur immediately without time-consuming initialization.
Solution Approach 2:
The system dynamically adjusts the reference station configuration by introducing a transition period where both current and new reference stations are active simultaneously. This dynamic approach allows the system to adapt to the rover's movement by smoothly switching between reference stations based on baseline threshold conditions, maintaining continuous high-accuracy navigation.
2Reliability
If data from both current and new reference stations is processed simultaneously, then seamless handover is achieved, but processor load increases
Solution Approach 1:
The system applies partial action by processing data from both reference stations simultaneously only during the limited overlap/transition period when handover is occurring. For the majority of time when the rover is within the baseline threshold of the current reference station, only the current reference station data is processed, thus reducing overall processor load while maintaining navigation continuity during critical transition moments.
Solution Approach 2:
The system uses periodic action by activating the dual reference station data processing only during specific transition periods when the baseline threshold is exceeded. This periodic activation rather than continuous operation reduces the overall processor load while ensuring reliability is maintained during the critical handover moments when it is most needed.
3Ease of operation
If the overlap period for processing both reference stations is extended, then handover smoothness improves, but power consumption increases
Solution Approach 1:
The system uses partial action by maintaining the overlap period long enough to ensure smooth handover (sufficient for solving integer ambiguities) but not excessively long to waste energy. The overlap period is optimized to be just sufficient for the critical handover function, avoiding unnecessary extension that would increase power consumption without additional benefit.
Solution Approach 2:
The system changes the parameter of overlap period duration to optimize the balance between handover smoothness and power consumption. By adjusting this time parameter, the system achieves sufficient smoothness for maintaining navigation accuracy while minimizing the energy consumed during the transition period.
Data Source
AI summary
For supporting a change of a reference station, first data that is valid for a first reference station is provided for transmission to a device, then data that is valid for the first reference station and data that is valid for a second reference station is provided for transmission to the device in parallel for a limited time, and finally data that is valid for the second reference station is provided for transmission to the device. The data for the first reference station and the data for the second reference station include measurements on satellite signals. At a receiving end, the respectively received data can be provided for a positioning of a device comprising a satellite signal receiver.