Multi-GNSS Rover Receiver Synchronization for Positional Accuracy
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Solution Overview
Problem
Existing GNSS guidance systems are limited to tracking and utilizing signals from a single satellite network, which restricts the potential for increased positioning accuracy and can result in less accurate position data due to satellite signal obstruction, such as by buildings or trees, as the rover receiver may not have a clear view of multiple satellites.
Innovation Solution
A system and method that enables a vehicle to detect and synchronize satellite signals from multiple GNSS networks using a base station transceiver, allowing the rover receiver to reallocate and track satellites in view, thereby increasing positional accuracy by ensuring multiple satellites are visible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rover receiver tracks satellites from a single GNSS network, then the system complexity is reduced, but the positional accuracy deteriorates due to satellite signal obstruction
Solution Approach 1:
The patent segments the satellite tracking function by dividing the receiver operations into base receiver (which tracks all available satellites from multiple networks) and rover receiver (which receives and processes differential corrections). This allows the rover to benefit from multiple GNSS networks without directly tracking satellites itself, resolving the contradiction between accuracy and complexity
Solution Approach 2:
The base receiver acts as an intermediary that collects satellite signals from multiple GNSS networks, computes differential corrections, and transmits them to the rover receiver. This intermediary approach enables the rover to achieve high positional accuracy through multiple satellite networks without the complexity of directly tracking and processing signals from all networks itself
2Measurement precision
If the rover receiver tracks more satellites from multiple GNSS networks, then the positional accuracy improves, but the difficulty of detecting and measuring satellite signals increases
Solution Approach 1:
The base receiver performs preliminary actions by pre-tracking all available satellites from multiple GNSS networks and pre-computing differential corrections before transmitting them to the rover. This preliminary processing eliminates the need for the rover to perform complex signal detection and measurement across multiple networks, resolving the contradiction between accuracy and detection difficulty
3Reliability
If the rover receiver uses standalone GPS system, then the device complexity is reduced, but the reliability deteriorates due to positioning errors from satellite clock reference, orbit location, ionosphere, and troposphere
Solution Approach 1:
The patent merges the base receiver and rover receiver into a coordinated differential positioning system. The base receiver with known coordinates provides differential corrections that compensate for errors in satellite clock reference, orbit location, ionosphere, and troposphere affecting the rover receiver. This merging approach improves positioning reliability without significantly increasing the complexity of the rover receiver itself
Data Source
AI summary
A differential global navigation satellite system (DGNSS)-based guidance system which is capable of utilizing satellites from multiple GNSS networks, for example in a real time kinematic (RTK) system. The remote rover receiver and the base station transceiver periodically synchronize to ensure that the satellites being tracked by the rover receiver correspond with those tracked by the base station transceiver. This ensures that redundant position data is filtered out and an accurate GNSS position of the rover unit can be determined. The ability to use satellites from different GNSS networks increases the accuracy of the positioning system and increases the chance of multiple satellites being available to a receiver under a greater number of circumstances.