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Wireless communication performance test channel simulation system for maglev traffic across steel sleepers

A wireless communication and test channel technology, which is applied in wireless communication, vehicle wireless communication services, large-scale transport vehicles, etc., can solve problems that cannot be simulated and cannot be fully applied to medium and low-speed maglev communication systems, and achieve accurate testing and The effect of the assessment

Active Publication Date: 2021-10-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the simulation mode and the hardware of the program-controlled computer, this instrument and method cannot be fully applied to the low-to-medium speed maglev communication system described above.
The laying method of the leaky cable in the medium and low speed maglev system is different from that of the traditional maglev traffic. The fluctuation of wireless signal attenuation due to the shelter of the sleeper cannot be completely simulated by the traditional program-controlled attenuation channel instrument.

Method used

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  • Wireless communication performance test channel simulation system for maglev traffic across steel sleepers
  • Wireless communication performance test channel simulation system for maglev traffic across steel sleepers
  • Wireless communication performance test channel simulation system for maglev traffic across steel sleepers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, see figure 1 and figure 2 , a wireless communication performance test channel simulation system for maglev traffic crossing steel sleepers, comprising two cylindrical shells 2, 4 with slots, and a fan-shaped rotatable metal baffle is placed between the two shells 2, 4 3. The metal baffle 3 is externally connected to the motor and the reducer 1. The motor and the reducer 1 communicate through the serial port of the control computer 11, and send instructions to rotate at a constant speed, rotate at a variable speed and stop rotating. During the rotation, the baffle 3 will block the two-layer shell The slits of 2 and 4 form a wireless communication channel that can be changed inside and outside the cylinder; the transmitting antenna 5 is placed inside the instrument cylinder, and the radiation direction is aligned with the slit outward, and the radio frequency line 9 is used to communicate with the external signal The transmitter 7 is connected to form a...

Embodiment 2

[0039] This embodiment is basically the same as Embodiment 1, especially in that:

[0040] In this embodiment, the control computer 11 controls the motor and the reducer 1 to drive the baffle 3 to rotate at a constant speed, rotate at a variable speed, and stop rotating, and periodically block the signal to form a wireless communication that can change between the inside of the cylinder and the outside of the cylinder. channel.

[0041] When the metal baffle 3 rotates, the space between the transmitting antenna 5 and the receiving antenna 6 will be blocked by the baffle 3, and the signal will be blocked to varying degrees as the metal baffle 3 rotates. This scene simulates a vehicle antenna The process of crossing the steel sleeper; when the metal baffle 3 is in other positions due to the rotation away from the gap 12, there is no shelter between the transmitting and receiving antennas. This scene simulates the scene when the vehicle-mounted antenna is located between two stee...

Embodiment 3

[0044] This embodiment is basically the same as the previous embodiment, and the special features are:

[0045] In this embodiment, the test is simulated when the distance between steel sleepers is fixed or the train runs at a constant speed. Such as figure 1 As shown in the figure, place the transmitting antenna in the instrument, connect the signal transmitter with a radio frequency line, transmit a fixed bandwidth signal, receive it by the receiving antenna placed outside the instrument, and connect it to the spectrum analyzer with a radio frequency line. The control computer runs as figure 2 In the program shown, input the initial speed (such as 5 revolutions / s), input the acceleration 0, and the program running time is 100 seconds. After the calculation of this program, the control motor will drive the baffle to rotate at a constant speed for 100 seconds at a speed of 5 revolutions per second. During the running time, the baffle rotates at a constant speed, and the baf...

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Abstract

The invention discloses a wireless communication performance test channel simulation system for maglev traffic crossing a steel sleeper, belonging to the field of maglev traffic communication. Two-layer cylindrical shell with slots is adopted, and a fan-shaped rotatable metal baffle is placed between the two shells. The metal baffle is externally connected to a motor and a reducer. The motor and the reducer communicate through the serial port of the control computer, and send instructions to rotate at a constant speed or at a variable speed. During the rotation, the baffle will cover the slits and periodically block the signal to form a wireless communication channel that can change between the inside of the cylinder and the outside of the round tube, simulating the situation that the transmitting and receiving antennas are blocked by sleepers when the train is running. Simulate the change of the wireless channel when the maglev traffic crosses the steel pillow, and test the reliability and quality of various business transmissions in the maglev traffic multi-service communication system in the laboratory. By changing the signal transmission mode and measurement method of the wireless channel instrument, the achieve the purpose of simulation.

Description

technical field [0001] The invention relates to a wireless communication performance test channel simulation system for maglev traffic crossing a steel sleeper, belonging to the field of maglev traffic communication. Background technique [0002] Maglev transportation adopts wireless communication system to carry CBTC (Communication Based Train Control, communication-based train control), data services of train operation status monitoring, or simultaneously carry wireless train dispatching, CCTV (Closed-Circuit Television, closed-circuit television monitoring system), PIS (Passenger Information System, passenger information system), emergency text and other services. In order to ensure the stability and quality of train-ground communication, it is necessary to measure the wireless channel of train-ground communication to determine the transmission delay, packet loss rate and throughput of the uplink and downlink of the system when the train is running. [0003] In the mediu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391H04W4/42H04W4/44H04W24/06
CPCH04W24/06H04B17/3912H04W4/42H04W4/44
Inventor 郑国莘张红可
Owner SHANGHAI UNIV
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