Hybrid GNSS Positioning With Wireless Ranging for Height Accuracy
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Solution Overview
Problem
Satellite positioning systems, such as GPS, suffer from low measurement accuracy in the height direction and are influenced by environmental factors, particularly in high-place work environments.
Innovation Solution
A system comprising a mobile wireless device and a fixed wireless device, utilizing satellite positioning for initial position measurement, calculating distances between the devices based on communication propagation time, and correcting clock and phase deviations to enhance position specification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite positioning system is used to measure worker position, then positioning coverage is provided, but measurement accuracy in height direction deteriorates
Solution Approach 1:
The patent combines satellite positioning system with wireless communication-based distance measurement to create a hybrid positioning system. The satellite system provides broad coverage while the wireless distance measurement (using propagation time of communication signals between mobile and fixed devices) supplements height accuracy, resolving the contradiction between coverage and precision.
Solution Approach 2:
The patent introduces wireless communication as an intermediary mechanism between the mobile device and fixed reference points. By measuring propagation time of communication signals, the system creates an additional measurement dimension that compensates for satellite positioning weaknesses in height direction, improving overall measurement reliability.
2Adaptability or versatility
If satellite positioning system is used for position measurement, then outdoor positioning is enabled, but measurement accuracy decreases in complex environments
Solution Approach 1:
The patent creates a dynamic positioning system that adapts to environmental conditions by switching between satellite positioning and wireless communication-based measurement. In environments where satellite signals are weak or inaccurate, the system dynamically uses communication propagation time measurement to maintain positioning accuracy, thus resolving the contradiction between environmental adaptability and measurement precision.
3Measurement precision
If distance is calculated using propagation time of communication, then positioning accuracy is improved, but time deviation between internal clocks affects measurement precision
Solution Approach 1:
The patent implements a feedback mechanism where the mobile device transmits its calculated position information back to the server. The server uses this feedback to adjust and correct time deviation between internal clocks of mobile and fixed devices, thereby improving the reliability of time synchronization and maintaining distance measurement precision.
Solution Approach 2:
The patent replaces complex hardware time synchronization mechanisms with a software-based correction system. Instead of requiring physically synchronized clocks, the system uses communication signals to measure propagation time and calculates time deviations, then applies software corrections to maintain measurement precision.
Data Source
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AI summary
An object of the present invention is to provide a novel system. Provided is a system comprising a mobile wireless device, and a fixed wireless device fixed at a predetermined position, the system comprising a satellite-based position measurer that measures a position of the mobile wireless device by a satellite positioning system; a wireless device distance calculator that calculates a distance between the mobile wireless device and the fixed wireless device on a basis of a propagation time of communication between the mobile wireless device and the fixed wireless device; and a position specifier that specifies the position of the mobile wireless device on a basis of the position measured by the satellite-based position measurer and the distance calculated by the wireless device distance calculator. Also, provided is a system comprising a mobile wireless device, and a fixed wireless device fixed at a predetermined position, the system comprising a satellite distance calculator that calculates a distance between a satellite and the mobile wireless device by a satellite positioning system; a wireless device distance calculator that calculates a distance between the mobile wireless device and the fixed wireless device on a basis of a propagation time of communication between the mobile wireless device and the fixed wireless device; and a position specifier that specifies a position of the mobile wireless device on a basis of the distance calculated by the satellite distance calculator and the distance calculated by the wireless device distance calculator.