GNSS RTK Integer Ambiguity Transfer Between Reference Stations
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Solution Overview
Problem
The initialization of integer ambiguity solutions when switching from one reference station to another in GNSS RTK positioning is time-consuming and results in a period of poor accuracy, especially when the current reference station becomes distant and a new one becomes more attractive.
Innovation Solution
A method where a location node determines the relationship between a first and a second reference station based on spatial information and compares their integer ambiguity levels. An indication is then transmitted to the wireless device to determine if the integer ambiguity level of the first reference station is transferable to the second, allowing for quicker reinitialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device reinitializes integer ambiguity solution when switching from one reference station to another, then positioning can be maintained, but the reinitialization process is time-consuming and results in a period of poor accuracy
Solution Approach 1:
The location node determines and stores the relationship between reference stations and their integer ambiguity levels in advance. When a wireless device needs to switch reference stations, the pre-determined relationship information is immediately available, eliminating the need for time-consuming reinitialization and maintaining continuous positioning accuracy.
Solution Approach 2:
The location node acts as an intermediary that manages the integer ambiguity level information between reference stations and wireless devices. It determines the relationship between different reference stations and provides this information to wireless devices, enabling them to transfer ambiguity levels without reinitialization.
2Adaptability or versatility
If the wireless device uses a new reference station when the current one becomes distant, then positioning coverage is extended, but the integer ambiguity solution must be reinitialized causing temporary accuracy loss
Solution Approach 1:
The system pre-determines and stores the integer ambiguity level relationships between multiple reference stations. When a wireless device needs to switch to a new reference station, the pre-stored relationship information allows immediate transfer of the ambiguity solution, maintaining positioning accuracy during the transition and enabling seamless reference station switching.
Data Source
AI summary
According to one aspect of the disclosure, a location node configured to communicate with a wireless device is provided. The location node includes processing circuitry configured to: receive spatial information; determine the wireless device relationship between a first reference station and a second reference station based at least in part on the spatial information; compare a first integer ambiguity level of the first reference station with a second integer ambiguity level of the second reference station, the second reference station corresponding to a current reference station of the wireless device; and transmit an indication of an applicability of the first integer ambiguity level of the first reference station to the second integer ambiguity level of the second reference station for position estimation, the indication being based on the comparison of the first integer ambiguity level with the second integer ambiguity level.