Underground Coal Mine Positioning Network Time Synchronization
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Solution Overview
Problem
Current positioning technologies in underground coal mines face challenges such as short transmission distance and high power consumption with Bluetooth, limited data transmission with Zigbee, high cost and interference issues with WiFi and UWB, and difficulties in time synchronization, which affect positioning accuracy in harsh and complex geological environments.
Innovation Solution
A time service and positioning network system that integrates optical fiber and satellite wireless time services, using ad-hoc network base stations with adjustable crystal oscillators to unify time references and improve positioning accuracy by establishing a unified time scale for wireless positioning, combining wired and wireless communication to reduce data conflicts and enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bluetooth positioning technology is used in underground coal mines, then positioning function is provided, but transmission distance is short and power consumption is high
Solution Approach 1:
The patent combines multiple positioning technologies (Bluetooth, Zigbee, WiFi, UWB) into a hybrid positioning system that leverages the strengths of each technology while compensating for their individual weaknesses, enabling reliable positioning across the entire underground mine environment
2Use of energy by moving object
If Zigbee positioning technology is used in underground coal mines, then power consumption is reduced, but data transmission capability is limited
Solution Approach 1:
The hybrid positioning system integrates Zigbee with other wireless technologies that have superior data transmission capabilities, allowing the system to maintain low power consumption while ensuring sufficient data transmission for accurate positioning
3Measurement precision
If WiFi or UWB positioning technology is used in underground coal mines, then positioning accuracy is improved, but cost increases
Solution Approach 1:
The patent applies different positioning technologies to different areas or scenarios within the mine based on specific requirements, using high-precision technologies like UWB only where necessary rather than uniformly across the entire system, thereby optimizing cost-effectiveness
4Area of stationary object
If multiple positioning technologies are deployed in underground coal mines, then positioning coverage is improved, but time synchronization difficulty increases
Solution Approach 1:
The patent introduces a centralized time synchronization server that acts as an intermediary to coordinate time references across all positioning devices and base stations, simplifying the synchronization process and ensuring consistent time references throughout the hybrid positioning system
Data Source
AI summary
The present disclosure discloses a time service and positioning network system for an underground chain-shaped large space in a coal mine. The system adopts a base station-level network internal time synchronization method which takes an optical fiber time service as a main part and takes a satellite time service as an auxiliary part to construct a time service and positioning network system with an unified time within the ad-hoc network base stations, based on the ad-hoc network base stations linearly arranged in the underground chain-shaped large space in the coal mine. Through the network construction, the network stabilization and the network application, the system unifies the time reference of the base station-level network and improves the positioning accuracy of the network application by utilization of the base station-level network internal time synchronization method. The system integrates the time service and positioning network system suitable for the underground coal mine and expands the network applicability based on an existing underground communication ring network.