KR20020008226A - Magnetic Field ID using the Variation of Magnetic Field in Different frequencies. - Google Patents

Abstract

One of the main causes of congestion on highways is the suspension of vehicles during the fare settlement process at toll gates. As a method to solve this problem, an automatic fare settlement method through identification of a unique ID of a vehicle has been considered. That is, the introduction of a system that automatically calculates and charges a fare even when the vehicle runs without stopping at the toll gate. There are various ways to identify IDs, such as using barcodes, using RF (Radio Frequency), using IC cards, using magnetic tapes, etc. . Because the vehicle must run without stopping, it is difficult to apply contact identification methods or too short an identifiable distance. So the usual method is to use RF, but the cost of RF ID module will be increased because wide frequency band and high cost are needed to handle multiple vehicles at the same time. Automatic toll settlement at Tollgate is good, but if Tollgate users have to invest a lot, it will be difficult to spread. Therefore, there is a need for a reasonable distance and a cheap module. MF ID is a new module that can satisfy both.

When applied to the highway fee unmanned settlement system, the MF ID Reader recognizes the unique ID from the MF ID module installed in the vehicle passing through the toll gate and automatically calculates the fare. Due to the structural characteristics of the MF ID, the module is very inexpensive compared to the RF ID, which facilitates widespread diffusion.

Description

Magnetic Field ID using the Variation of Magnetic Field in Different frequencies.

There are many ways to use RF (Radio Frequency), IC card, magnetic tape, etc.

Makes a lot of difference. Since the IC card method and the magnetic tape method are contact type, the present invention

It is not suitable for the information transfer method of the moving object intended by. At the same time for RFID

It can recognize multiple cards, enables high-speed recognition, and has a long sensing distance.

It can be easily applied depending on the conditions, it does not need to be inserted into the card reader, and there is no need for mechanical contact, so errors caused by friction, moisture, dust, snow, rain, etc.

There is no. However, the RF module is frequency multiplied or

Since spread spectrum method must be applied, it is still quite expensive to apply.

Follow the crowd.

In the figure of Figure 2 will be described the communication between the contactless ID reader (MF ID Reader # 1, # 2 ....) and the billing system. 1: N consisting of Master-Slave

In the multilateral communication, if the master knows the slave's ID at the initial stage, the master can designate the slave to perform data communication and control the integrated network communication format. That is, by allocating one communication channel from master to slave to communication channel from master to slave and one from communication channel from slave to master, only two frequencies can be used to exchange data with N slaves. To be able.

In the MF card attached to the vehicle, the magnetic field generating transformer of the characteristic frequency that is spaced apart from each other is a signal source, and this transformer is arranged at regular intervals in parallel with the traveling direction of the driving vehicle. Even if the position is fixed, the MFID attached to the vehicle naturally reads the internal magnetic field change of the MFID when the vehicle runs and passes, thus reading the interval between frequencies. This is an unequal interval

It is the same concept of space layout as reading bar-codes arranged with. This concept contrasts with the method of transmitting the data corresponding to a specific code or ID in the RF method with a time interval for transmitting a series of data strings.

1 illustrates a method for arranging a transformer for generating an MFID to which the present invention is applied.

2 illustrates a highway fare settlement system related to a method of applying MFID.

3 is a unique ID that appears when passing through the toll gate using the MFID

The discrimination process is shown.

As shown in the example of FIG. 2, an MFID reader device is installed on a road surface for each lane at a gate where several vehicles enter. In this case, the driving vehicle will pass over the MFID Reader.

As it passes, the fare settlement system knows the individual ID for each vehicle. Afterwards, the fare settlement system sends down data to each vehicle along with the individual ID of each vehicle (downward channel), and each vehicle uploads data in the time domain allocated by the fare settlement system (upstream channel), thereby preventing interference with each other. prevent.

As shown in FIG. 1, the MF ID generates 268,435,456 (16 도, n = 7) different IDs at 8 frequencies as a method of recognizing a magnetic field change of various frequencies arranged at different positions according to the IDs. (7 are involved in ID generation from F1 to F7 except F0 which recognizes the start and end) In other words, 16 ID recognition sections are created in the horizontal line and 7 different frequencies are applied to the vertical line to apply 268,435,456 Can generate ID In the first line, the transformer oscillating to F0 is placed on both sides to set the reference position.

In the second to eighth lines, transformers F1 through F7 are arranged.The transformers F1 through F7 can display 16 numbers each, and there are 7 transformers (F1 through F7), so there are 268,435,456 ( 16ⁿ, n = 7) can be generated.

By the way, the number of IDs can also be generated by adjusting the number of transformers.

It is adjustable. In addition, MFID can recognize the maximum distance of 1m, so

When used, MFID can be used regardless of the type of vehicle. In addition, MFID has directivity, so when applied to roads, one MFID reader is installed in each lane so that the vehicles in other lanes are not disturbed at all. As shown in FIG. 1, when eight types of oscillation frequencies F0 to F7 are supplied to an audio transformer (OPT), eight types of magnetic fields having different frequencies appear. The transformer with this magnetic field

If you randomly place 16 blanks each, you can get as many as 16 powers of 16.

Can generate ID However, since F0 is always used as a frequency to indicate the start and end points, the actual number of available IDs corresponds to a power of 16.

In this way, the number of IDs increases by 16 times as the number of transformers increases.

Because the vehicle must run without stopping, it is difficult to apply contact identification methods or too short an identifiable distance. So the usual method is to use RF, but the cost of RF ID module will be increased because wide frequency band and high cost are needed to handle multiple vehicles at the same time. Automatic toll settlement at the tollgate is good, but it will be difficult to spread if an individual has to invest a lot. Therefore, the present invention can establish a 1: N communication network by assigning one frequency to each of the uplink channel and the downlink channel by using the MFID. Therefore, in 1: N communication network

The number for establishing simultaneous communication occurring at any time must have N different frequency channels, and even if the number of simultaneous communication is limited, the allocation of many frequency channels must be required. In contrast, MFID is an important means of forming a simple network configuration using only two frequency channels.

The card's identification distance can be up to 1m while realizing low price, so it can be attached to the vehicle and can be easily read even at high speed.

Claims (1)

Magnetic Field ID (MF ID) is generated based on the transformer arrangement method from F1 to F7 based on the transformer oscillating at F0 according to the change of magnetic field at different frequencies. That is, the ID of the magnetic field method of reading the data by the change of the magnetic field, the main source of generating the magnetic field is a transformer, which is applied to the transformer. The frequency of the magnetic field varies with frequency. In addition, the magnetic field applied to the transformer uses a frequency range that does not saturate, and the efficiency is high when applied to an object moving at a faster speed than other methods because the magnetic field has a long distance and a fast response speed. In this case, the transformer uses 7 and the different IDs make 16ⁿ (n = 7). Here, using 10 transformers, we can create 16ⁿ (n = 10) different IDs. If 12 batches of 20 transformers are used, IDs can be made in quantities of 20ⁿ (n = 12).