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Low frequency magnetic field based no-parking toll collection system

A technology of parking charging and low-frequency magnetic field, which is applied to instruments, inductive record carriers, computer parts, etc., and can solve the problems of inability to effectively receive signals and low radiation intensity of far-field fields.

Inactive Publication Date: 2008-12-31
高英
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of information security, it is required that the radiation intensity of the far field should be as small as possible, so that the radio receiver with conventional receiving sensitivity (typically -120dBm) cannot effectively receive it outside the controllable distance of the toll station (typically 100m) Signal

Method used

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  • Low frequency magnetic field based no-parking toll collection system
  • Low frequency magnetic field based no-parking toll collection system
  • Low frequency magnetic field based no-parking toll collection system

Examples

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Embodiment Construction

[0042]The implementation of information transmission between the mobile terminal 2 and the fixed terminal 4 in the proximity induction field of low-frequency electromagnetic waves by means of inductive coupling reception and active transmission, for example figure 1 shown. In this implementation example, 125kHz sine wave is selected as the low-frequency carrier signal (wavelength λ=2400m), and 3.9kb / s (bit time t=256μs) Manchester code (ManchesterCode) is selected to perform amplitude keying (ASK) modulation on the carrier signal. The vehicle-mounted mobile terminal 2 is arranged at the central position under the chassis of the automobile 1, and the fixed terminal 4 is arranged at the central position of the lane on the road surface 7 to ensure that the fixed terminal and the mobile terminal have a relatively long effective coupling time when the vehicle passes by. In order to obtain the best coupling effect, in the arrangement of the mobile terminal and the fixed terminal, it...

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Abstract

The invention relates to a method for carrying out information exchange by fully utilizing a near zone induction field of low-frequency electromagnetic wave in a non-stop car charging system. The system of the invention realizes that a car mounted mobile terminal 2 is arranged under a chassis of an automobile 1; a fixed terminal of a charging site is arranged above a carriageway surface 7; the mobile terminal and the fixed terminal mutually carry out the information transfer by the method of transmitting with a low-frequency magnetic field and receiving with inductance coupling in the near zone induction field of low-frequency electromagnetic wave; the fixed terminal 4 transmits the low-frequency magnetic field 3 by a transmitter coil 5 and the mobile terminal 2 receives the low-frequency magnetic field by a receiving coil 6; the transmission of the low-frequency magnetic field in the mobile terminal 2 and the receiving of the low-frequency magnetic field in the fixed terminal are completed respectively by inside corresponding inductance coils. The information exchange between the fixed terminal and the mobile terminal is carried out by a half duplex mechanism of the fixed terminal call and mobile terminal response. The design method provided by the invention achieves the purposes of high communication reliability, excellent information security and outstanding economical efficiency.

Description

technical field [0001] The invention relates to a method for information interaction using a low-frequency magnetic field in a near-area induction field of low-frequency electromagnetic waves in a car non-stop charging system. This is a design and implementation method of a non-stop charging system with high communication reliability, good information security and outstanding economy. The content of the present invention can be widely applied to the design of non-stop toll collection systems in roads, parking lots and the like. Background technique [0002] With the rapid growth of the number of vehicles, the load of various public roads and traffic facilities also shows a continuous growth trend, and congestion often occurs, especially near the toll stations of ordinary roads, expressway entrances, and exits. . The inefficient operation of toll stations is the direct cause of nearby congestion and low vehicle passing rates. Although the road traffic management department...

Claims

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Application Information

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IPC IPC(8): G07B15/00G06K7/00G07B15/06
Inventor 高英
Owner 高英
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