Mining Vehicle Collision Avoidance Using EM Pulse and RF Signals
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Solution Overview
Problem
Existing electromagnetic (EM)-based distance measuring systems for mining vehicles are inefficient due to low EM frequencies, leading to slow data transmission and limited transmitter identification, and are unsuitable for underground applications where GPS is unavailable.
Innovation Solution
A system using high RF signals synchronously emitted with EM pulses, received by a unit with a magnetic field receiver and RF transceiver, allowing for faster proximity detection and collision avoidance by determining distances based on magnetic field strength, and integrating an on-board navigation system with beacons for position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EM-based distance measuring systems use low EM frequencies for proximity detection, then the system can detect objects within the environment, but the transmission of data on the carrier signal takes a long time and reduces the number of transmitters that can be reliably identified within a given space and time
Solution Approach 1:
The system uses periodic EM pulses instead of continuous low-frequency carrier waves. Each pulse is a short burst of high-frequency energy that carries distance information through time-of-flight measurement, while identity information is transmitted separately through RF signals. This periodic pulsed action dramatically reduces the time each transmitter occupies the channel, allowing many more transmitters to be identified reliably within the same time period.
Solution Approach 2:
The system performs preliminary negotiation of transmission slots before actual distance measurement. Transmitters and receivers exchange identity information and schedule their communication slots in advance, allowing the EM pulses to be sent without waiting for carrier signal data transmission. This preliminary coordination eliminates the time bottleneck of low-frequency data transmission while maintaining reliable transmitter identification.
2Reliability
If EM-based distance monitoring systems negotiate transmission slots in real-time to avoid on-air collisions, then collision avoidance is achieved, but in environments with fluid numbers of randomly moving transmitters, this problem becomes unmanageable and limits the number of simultaneous transmitters to a small few
Solution Approach 1:
The system performs preliminary negotiation of transmission slots before actual distance measurement. Transmitters and receivers exchange identity information and schedule their communication slots in advance, allowing the EM pulses to be sent without waiting for carrier signal data transmission. This preliminary coordination eliminates the time bottleneck of low-frequency data transmission while maintaining reliable transmitter identification.
Solution Approach 2:
The system replaces the mechanical negotiation process of traditional EM systems with a more efficient protocol. Instead of continuous real-time slot negotiation that creates bottlenecks, the system uses pre-negotiated slots combined with pulse-based distance measurement that doesn't require ongoing communication during the measurement process itself, dramatically increasing the number of simultaneous transmitters.
3Measurement precision
If EM-based distance measuring systems use low EM frequencies for distance measurement, then the system can measure relative distances between objects, but the time needed for measuring distances is quite long and may not be suitable for vehicles moving at higher speeds
Solution Approach 1:
The system uses periodic EM pulses instead of continuous low-frequency carrier waves. Each pulse is a short burst of high-frequency energy that carries distance information through time-of-flight measurement, while identity information is transmitted separately through RF signals. This periodic pulsed action dramatically reduces the time each transmitter occupies the channel, allowing many more transmitters to be identified reliably within the same time period.
Solution Approach 2:
The system changes the frequency parameter from low-frequency continuous waves to high-frequency pulsed signals. By using high-frequency EM pulses for distance measurement, the system achieves faster measurement cycles that can keep up with vehicles moving at higher speeds, while maintaining accurate distance measurement through precise time-of-flight calculation.
4Measurement precision
If GPS tracking is used to determine the position of vehicles within an area for collision avoidance, then position determination is achieved for above ground applications, but GPS tracking is not available underground, rendering such systems unsuitable for underground mining applications
Solution Approach 1:
The system replaces GPS satellite-based positioning with a localized EM pulse and RF signal system. Instead of relying on external satellite signals that cannot penetrate underground, the system uses local transmitters and receivers that emit EM pulses and RF signals, with distance calculated through time-of-flight measurement and magnetic field strength analysis. This substitution makes the system fully adaptable to underground mining environments while maintaining position determination accuracy.
Solution Approach 2:
The system introduces local transmitters and receivers as intermediary devices that provide positioning functionality in environments where GPS is unavailable. These intermediaries emit EM pulses and RF signals that propagate through the underground environment, allowing position determination without direct satellite contact, thus extending adaptability to subterranean applications.
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
This system significantly reduces transmission time, allows more vehicles to operate simultaneously, and provides effective proximity detection and collision avoidance in underground environments without relying on GPS.
Implementation Method 1
a receiver unit disposed off-board the mining vehicle in a mine receiving the EM pulse and the RF signal, where the receiver unit includes a magnetic field receiver
Implementation Method 2
one or more transceiver devices configured to emit an electromagnetic (EM) pulse and a radio frequency (RF) signal from the mining vehicle
Implementation Method 3
the control unit is configured to determine a distance between the mining vehicle and the receiver unit based on the EM pulse and the RF signal that are received
Data Source
AI summary
A mining vehicle control system includes a detection unit configured to determine a proximity of a monitored mining vehicle to a first mining vehicle and a controller configured to determine first protection lines that linearly project from the first mining vehicle and second protection lines that linearly project from the monitored mining vehicle. The first protection lines are determined based on a moving speed of the first mining vehicle. The second protection lines are determined based on a moving speed of the monitored mining vehicle. The controller is configured to direct the first mining vehicle to change movement of the first mining vehicle responsive to intersection of one or more of the first protection lines with one or more of the second protection lines.