RTK Positioning Using Integer Ambiguity Relay
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Solution Overview
Problem
The real-time kinematic (RTK) positioning method requires a lengthy initializing process and data reception time to calculate position coordinates, which prolongs the overall positioning time due to the need for determining integer ambiguity and receiving GPS correction data.
Innovation Solution
The system employs a first electronic device to calculate and transmit integer ambiguity and GPS correction data to a second electronic device, allowing the second device to skip the initializing process and directly use the received data for positioning, thereby shortening the positioning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the initializing process is executed to determine integer ambiguity, then positioning accuracy is improved, but positioning time is prolonged
Solution Approach 1:
The first electronic device performs the initializing process and determines integer ambiguity in advance. This preliminary action allows the second electronic device to skip the time-consuming initialization and directly use the pre-determined integer ambiguity value, thereby reducing positioning time while maintaining accuracy.
Solution Approach 2:
The first electronic device acts as an intermediary that performs the complex initialization process and shares the determined integer ambiguity with the second electronic device. This mediator approach allows the second device to avoid redundant initialization while still achieving accurate positioning.
2Measurement precision
If GPS correction data is received from a fixed station, then positioning accuracy is improved, but data reception time is prolonged
Solution Approach 1:
The second electronic device receives and uses the integer ambiguity data copied from the first electronic device. This copying approach allows the second device to avoid re-receiving and processing the full GPS correction data, reducing data reception time while maintaining positioning accuracy.
3Loss of time
If the initializing process is skipped, then positioning time is shortened, but positioning reliability may be compromised
Solution Approach 1:
The system establishes a feedback mechanism where the first electronic device provides the determined integer ambiguity to the second electronic device. This feedback ensures that the second device receives accurate initialization information without needing to perform its own initialization, thereby maintaining reliability while reducing time.
Data Source
AI summary
A navigation satellite system includes a first electronic device that decides, based on received GNSS correction data, integer ambiguity in a difference between a first carrier phase of a first radio wave received by a fixed station and a second carrier phase of a second radio wave received by the first electronic device to calculate a path difference between the first radio wave and the second radio wave. The system also includes a second electronic device that calculates, based on the GNSS correction data, a difference between a third carrier phase of a third radio wave received by the second electronic device and the first carrier phase received from the first electronic device and calculates, by using the integer ambiguity, a path difference between the first radio wave and the third radio wave to calculate second relative coordinates of the second electronic device with respect to the fixed station.