Radiating Cable Positioning System With Dual-End GNSS Signal Injection
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Solution Overview
Problem
Existing indoor positioning systems using radiating cables are imprecise and lack continuous positioning between indoor and outdoor environments, requiring specific applications and being prone to service disruptions.
Innovation Solution
A positioning system along a radiating cable that generates synchronized GNSS signals at both ends, allowing users to maintain continuous positioning without interruptions by simulating open-sky conditions, using a configuration file with visibility masks, navigation data, and clock synchronization to eliminate propagation differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single GNSS signal generator is used at one end of the radiating cable, then the system cost is reduced, but the positioning precision along the cable deteriorates and service continuity between indoor and outdoor environments is disrupted
Solution Approach 1:
The system divides the radiating cable into two sections with signal injection points at both ends. Each end has its own GNSS signal generator that creates signals propagating in opposite directions, allowing precise positioning along the entire cable length while maintaining service continuity between indoor and outdoor environments.
Solution Approach 2:
The system pre-calculates and stores visibility masks and navigation data in configuration files before operation. This preliminary preparation enables the dual-end signal generators to quickly establish accurate positioning without service disruption when transitioning between indoor and outdoor environments.
2Ease of operation
If signal intensity measurement is used to determine position along the cable, then positioning capability is achieved, but measurement precision deteriorates due to power variations and interference
Solution Approach 1:
Instead of measuring signal intensity to determine position, the system inverts the approach by injecting synchronized GNSS signals at both ends and using the time difference of arrival (TDOA) of these known signals to calculate position. This eliminates the precision problems associated with RSSI measurements while maintaining positioning capability.
3Measurement precision
If multiple GNSS generators are distributed along the cable to improve positioning precision, then positioning accuracy improves, but device complexity and system cost increase
Solution Approach 1:
The system segments the cable into two sections with injection points at each end, achieving precise positioning throughout the entire cable length. This segmentation approach provides accurate positioning without the complexity and cost of distributing multiple generators along the entire cable.
4Measurement precision
If sections are discretized with independent GNSS generators to achieve spatial resolution, then positioning precision improves, but interference increases when sections are close together
Solution Approach 1:
The system assigns different characteristics to signals from each end - specifically, signals from opposite ends are designed to be distinguishable by the receiver. This local differentiation allows spatial resolution along the cable while minimizing interference between adjacent signal sources.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise user positioning along the radiating cable with minimal service disruption, maintaining continuous operation between indoor and outdoor environments without the need for additional applications or increased system costs.
Implementation Method 1
a cable positioning system radiant (leaky feeder) in which the position of a terminal is determined
Data Source
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AI summary
The present invention relates to a positioning system and method along a cable. The positioning system (100) comprises, besides the radiating cable (110), generation means (120) for generating first and second GNSS signals, first injection means (131) for injecting the first GNSS signals at a first end of the cable, and second injection means for injecting the second GNSS signals at the second end of the cable. The first (second) GNSS signals are defined as those that would be received at a point situated at a first (second) virtual end of the cable, in an open-sky configuration, from a first (second) set of satellites visible in a first (second) cone of visibility.