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Method for detecting departure of non-contact type CPU card from radio frequency field

一种非接触式、射频场的技术，应用在智能卡领域，能够解决干扰卡片操作状态等问题，达到实现检测的效果

Active Publication Date: 2012-10-10
FEITIAN TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of detecting the non-contact CPU card, the inventor found at least the following problems in the prior art: After the card search is activated, the In the gap of data interaction, it is impossible to detect whether the card is in the radio frequency field in real time
The usual method is to redo the card search operation, but this will interfere with the original operating state of the card

Method used

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  • Method for detecting departure of non-contact type CPU card from radio frequency field
  • Method for detecting departure of non-contact type CPU card from radio frequency field
  • Method for detecting departure of non-contact type CPU card from radio frequency field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] See figure 1 , Embodiment 1 provides a method for detecting that the card leaves the radio frequency field, which specifically includes:

[0123] Step 101: Power on the card reader to initialize;

[0124] In this embodiment, the card is initially marked as 0 in the radio frequency field.

[0125] Step 102: Receive an instruction, and determine whether a valid instruction is received;

[0126] If yes, go to step 110; if no, go to step 103.

[0127] In this embodiment, the card reader receives the instruction sent from the buffer in the USB interrupt pipe mode. If the first byte of the instruction is within the preset range (0x01-0x03), it means that a valid instruction has been received. For example, if the first byte of the received command is 0x01, then a valid command is received. If the card reader does not receive or the first byte of the received instruction does not meet the preset value, the received instruction is not a valid instruction.

[0128] Step 103: Determine wh...

Embodiment 2

[0249] Referring to Figures 2(1) and 2(2), Embodiment 2 provides a method for detecting the card leaving the radio frequency field, which specifically includes:

[0250] Step 201: Power-on initialization of the card reader;

[0251] Turn on timed interrupts.

[0252] In this embodiment, the card is initially marked as 0 in the radio frequency field.

[0253] Step 202: Receive an instruction;

[0254] In this embodiment, the instruction received by the card reader may be a notification card seeking instruction, APDU instruction, or extended instruction sent by the host computer.

[0255] Step 203: Determine whether a valid instruction is received;

[0256] If yes, go to step 204; if no, go to step 213.

[0257] The judgment method is the same as step 102 in the first embodiment.

[0258] Step 204: Determine the instruction type;

[0259] In this embodiment, if the first byte of the instruction received by the card reader is 0x01, which is a notification instruction for finding a card, then st...

Embodiment 3

[0383] Referring to Figures 3(1) and 3(2), Embodiment 3 provides a method for detecting the card leaving the radio frequency field, which specifically includes:

[0384] Step 301: Power on the card reader to initialize;

[0385] Open communication interruption.

[0386] In this embodiment, the instruction flag is initially 0, and the card is initially 0 in the radio frequency field.

[0387] Step 302: Determine whether the instruction flag is 1;

[0388] If yes, go to step 311; if no, go to step 303.

[0389] Step 303: Judge whether the card has a flag of 1 in the radio frequency field;

[0390] If yes, go to step 304; if no, go to step 311.

[0391] Step 304: Perform a detection card operation;

[0392] In this embodiment, the specific card detection operation is the same as step 104 in Embodiment 1.

[0393] Step 305: Determine whether the card detection command response is successfully received;

[0394] If yes, go to step 306; if no, go to step 308.

[0395] In this embodiment, the specifi...

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Abstract

The invention discloses a method for detecting departure of a non-contact type CPU (central processing unit) card from a radio frequency field, relating to the field of intelligent cards, to solve the problem that the departure of the CPU card from the radio frequency field cannot be detected in real time. The method comprises the steps of receiving and judging whether effective instructions sent by an upper computer is received, and then carrying out corresponding operations according to the received instructions. If the received instruction is a notice on card searching, the card searching operation is carried out, and whether the returned information is received is judged; the information of card number of the non-contact type card is acquired according to the returned information; if the received instruction is an APDU (application protocol data unit) instruction, then the card is judged to be marked in the radio frequency field, if the card is in the radio frequency field, then the card detection operation is carried out, and the operation result is transmitted to the upper computer, and if the card is not in the radio frequency field, then the card searching operation is carried out.

Description

technical field [0001] The invention relates to the field of smart cards, and relates to a method for detecting that a non-contact CPU card leaves a radio frequency field. Background technique [0002] Contactless card, also known as radio frequency card, is composed of IC chip and induction antenna, which are packaged in a standard PVC card, and the chip and antenna have no exposed parts. It is a new technology developed in the world in recent years. It successfully combines radio frequency identification technology and IC card reader technology, which ends the problem of passive (no power supply in the card) and contact-free. It is an electronic A major breakthrough in the field of devices. The card is close to the surface of the reader at a certain distance (usually 5-10mm), and the data is read and written through the transmission of radio waves. [0003] Radio frequency identification uses radio frequency to perform non-contact two-way transmission of data between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
CPCG06K7/00G06K7/10128G06K7/10366
Inventor 陆舟于华章
Owner FEITIAN TECHNOLOGIES
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