Communication distance control method and radio frequency card reading device
A control method and radio frequency card reading technology, which is applied in the field of communication, can solve the problem of high calibration system requirements, achieve the effect of reducing calibration requirements and preventing accidental misuse
Active Publication Date: 2012-10-03
NATIONZ TECH INC
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Problems solved by technology
This method can solve the distance control problem, but requires strict calibration for each mobile communication terminal with a radio frequency subscriber identification module card to meet the communication distance control requirements. This method has high requirements for the calibration system
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[0041] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0042]The present invention first proposes a method for detecting the distance between the object to be detected and a fixed point by using echo. The reflection signal of the object to the detection signal, detect the field strength change value of the reflection signal, and determine the distance between the object to be detected and the fixed point according to the corresponding relationship between the field strength change value of the reflection signal and the distance between the object to be detected and the fixed point distance between.
[0043] Wherein, detecting the field strength change value of the reflected signal may specifically be: detecting the total field strength value of the detection signal rece...
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The invention relates to a communication distance control method and a radio frequency (RF) card reading device. The communication distance control method comprises the steps of judging whether the difference between Rclosedis and Rmaxdis is greater than a preset dynamic threshold value M or not; if yes, triggering the RF user identification module card of the mobile communication terminal to send a second RF signal; if the field intensity value of the second RF signal is greater than the difference between a distance control threshold value Pgate and a threshold adjusting value Pgate_adj, starting the card swiping process. The Rclosedis is the field intensity value of the second RF signal sent by the RF user identification module card of the mobile communication terminal during detection at a near-distance point and the Rmaxdis is the field intensity value of the second RF signal sent by the RF user identification module card of the mobile communication terminal during near-distance detection during detection at a furthest point. According to the invention, the alignment requirements can be lowered and the maximum communication distance of the RF user identification module card is limited. Therefore, accidental card mis-swiping accidents can be avoided.
Description
technical field [0001] The invention relates to the communication field, in particular to a communication distance control method and a radio frequency card reading device. Background technique [0002] SIM (Subscriber Identity Module, Subscriber Identity Module) cards and other subscriber identity module cards used in mobile communication technology (for example, subscriber identity module cards can also be USIM cards or UIM cards, etc.), are widely used as subscriber identity devices for mobile communication terminals . With the development of science and technology, various intelligent circuit modules are added to SIM cards and other SIM cards of ordinary mobile communication terminals through various methods, so that the modified SIM card has basic SIM card functions. , and other functions that are closer to life, radio frequency subscriber identification module card (such as radio frequency SIM card) is one of them. [0003] The Chinese patent No. 200710124354.7 descr...
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IPC IPC(8): G06K7/00H04B5/48
CPCH04B17/0057G01S13/003H04W64/00G01S13/08H04B17/318
Inventor 孙迎彤余运波沈爱民罗魏熙
Owner NATIONZ TECH INC