WO2011022894A1

WO2011022894A1 - Method for controlling communication distance and radio frequency reading device

Info

Publication number: WO2011022894A1
Application number: PCT/CN2009/074661
Authority: WO
Inventors: 孙迎彤; 沈爱民; 罗魏熙; 余运波
Original assignee: 国民技术股份有限公司
Priority date: 2009-08-24
Filing date: 2009-10-28
Publication date: 2011-03-03
Also published as: CN101996301A; CN101996301B

Abstract

A method for detecting a distance is disclosed, the method includes the steps of: transmitting a detection signal with a set power at a certain point; receiving a reflection signal on the detection signal for an object to be detected at the certain point; detecting a field strength variation value of the reflection signal; according to a corresponding relationship between the field strength variation value of the reflection signal and the distance between the object to be detected and the certain point, determining the distance between the object to be detected and the certain point. By this method for detecting the distance, it is capable of detecting the distance between the object to be detected and the certain point conveniently.

Description

Communication distance control method and radio frequency card reading device

The present invention relates to the field of communications, and in particular, to a method for controlling a communication distance and a radio frequency card reading device. Background technique

A user identification module card such as a SIM (Subscr iber Ident I ty Module) card used in mobile communication technology (for example, the user identification module card may also be a USIM card or a UIM card, etc.) as a user identification device of the mobile communication terminal is widely used. With the development of science and technology, various intelligent circuit modules are added in the body of the user identification module card such as the SIM card of the ordinary mobile communication terminal by various methods, so that the modified user identification module card has the function of the basic user identification module card. There are other functions that are closer to life, and RF user identification module cards (such as RF SIM cards) are one of them.

The high-frequency RF IC card device described in the Chinese patent No. 200710124354. 7 adopts active radio frequency technology, and can have mobile payment functions such as electronic wallet or consumer application functions such as mobile communication terminal access control. However, in some of the payment application functions, the wireless communication distance must be controlled within a small range, otherwise it may cause erroneous operations, such as public transportation, subway, etc., if the passenger holds the RF IC card device away from the card reading device. Very close, but do not want to swipe the card, and the distance control of the card reading device is not accurate enough, it will be wrongly swiped, so how to achieve effective communication distance control is a key technical problem that needs to be solved.

At present, the existing radio frequency subscriber identity module card communication distance control technology adopts the following methods: using calibration technology to attenuate the transmission power of the radio frequency subscriber identification module card, so that the signal strength of the radio frequency signal reaching the card reader is moderate; or the radio frequency user identification module The card uses a certain power to transmit RF signals. The signal strength detection threshold is set by the card reader to determine whether the distance control requirement is satisfied. This method can solve the distance control problem, but requires strict calibration of each mobile communication terminal with the RF subscriber identity module card to meet the communication distance control requirements. This method has high requirements for the calibration system. Summary of the invention

One technical problem to be solved by the present invention is to provide a distance detecting method for detecting the distance between an object to be detected and a fixed point.

In order to solve the above technical problem, the present invention provides a distance detecting method for transmitting a detection signal at a set power at a fixed point, and receiving a reflected signal of the detection signal on the detection signal at the fixed point, and detecting a field of the reflected signal. The strong change value determines a distance between the object to be detected and the fixed point according to a correspondence between a field strength change value of the reflected signal and a distance between the object to be detected and the fixed point.

Further, the above method may further have the following feature: the detecting the field strength change value of the reflected signal is specifically: detecting a total field strength value of the detection signal received at the fixed point, and the field strength change value of the reflected signal is equal to The difference between the total field strength value and the field strength value of the directly coupled signal, the direct coupling signal being the detection signal received at the fixed point without the object to be detected.

In order to solve the above technical problem, the present invention further provides a distance detecting device, including: a transmitting module, configured to transmit a detection signal at a set power at a fixed point;

a receiving module, configured to receive a reflected signal of the detection signal on the detection signal at the fixed point; and a detecting module, configured to detect a field strength change value of the reflected signal;

The distance determining module is configured to determine a distance between the object to be detected and the fixed point according to a correspondence between a field strength change value of the reflected signal and a distance between the object to be detected and the fixed point.

With the distance detecting method of the present invention, the distance between the object to be detected and the fixed point can be easily detected. Another technical problem to be solved by the present invention is to provide a control method for communication distance, which reduces calibration requirements and prevents accidental mis-wiping.

In order to solve the above technical problem, the present invention provides a communication distance control method, including: Step a, detecting whether the mobile communication terminal enters the farthest detection range, and if so, triggering the RF user identification module card of the mobile communication terminal to transmit the second The radio frequency signal, and recording the field strength value Rmaxdi s of the second radio frequency signal transmitted by the radio frequency subscriber identity module card when the mobile communication terminal is at the farthest detection point, and the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting after the recording RF signal, perform step b, otherwise repeat step a;

Step b, detecting whether the mobile communication terminal enters the short-range detection range, and if so, triggering the radio frequency subscriber identity module card of the mobile communication terminal to transmit the second radio frequency signal, and recording the radio frequency user identification of the mobile communication terminal at the close-range detection point The field strength value Rc losedi s of the second radio frequency signal transmitted by the module card is recorded, so that the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting the second radio frequency signal, and step c is performed, otherwise step b is repeated;

Step c, determining whether the difference between Rc losedi s and Rmaxdi s is greater than a preset dynamic threshold value M, and if so, triggering the radio frequency subscriber identity module card of the mobile communication terminal to transmit a second radio frequency signal, and recording the second radio frequency signal The field strength value, step d is performed, otherwise the distance control process is ended; step d, obtaining the distance control threshold value Pgate of the mobile communication terminal, determining whether the field strength value of the second radio frequency signal is greater than the distance control threshold The difference between the value Pgate and the threshold adjustment value Pgate_adj, if yes, initiates the card swiping process, otherwise the current distance control process ends.

Further, the above method may further have the following feature. In the step a, the farthest detection range is preset by the radio frequency card reading device, and the farthest detection point is a point on the edge of the farthest detection range.

Further, the above method may also have the following features, the detection process in the step a includes: Step a 1 , preset echo detection mean MDavg;

Step a2, presetting the farthest detection distance threshold MDmaxd is , MDmaxd is based on the measurement The minimum field strength change value that can be detected by the echo detection obtained by the test;

Step a3, real-time receiving the first radio frequency signal emitted by the radio frequency card reading device and the reflected signal of the first radio frequency signal by the mobile communication terminal, and obtaining the real time field strength value MDrt of the first radio frequency signal at the moment;

Step a4, determining whether the difference between the real-time field strength value MDrt and the echo detection mean value MDavg is greater than the farthest detection distance threshold MDmaxdis, and if so, determining that the mobile communication terminal enters the farthest detection range, otherwise determining that the mobile communication terminal does not enter the farthest distance examination range.

Further, the above method may further have the following feature. In the step b, the short-range detection range is preset by the radio frequency card reading device, and the close-distance detection point is a point on the edge of the close-range detection range.

Further, the above method may also have the following features, the detection process in the step b includes: Step bl, preset echo detection mean MDavg;

Step b2, preset the proximity detection distance, and detect the typical field strength change value of the first RF signal received by the RF card reader relative to the echo detection mean MDavg, which is called the close detection threshold MDclosedis;

Step b3, real-time receiving the first radio frequency signal emitted by the radio frequency card reading device and the reflected signal of the first radio frequency signal by the mobile communication terminal, and obtaining the real time field strength value MDrt of the first radio frequency signal at the moment;

Step b4, determining whether the difference between the real-time field strength value MDrt and the echo detection mean value MDavg is greater than the close-range detection threshold MDclosedis, and if so, determining that the mobile communication terminal enters the short-range detection range, otherwise determining that the mobile communication terminal does not enter the close-range detection range.

Further, the foregoing method may further have the following features. In the step c, the method for determining the dynamic threshold value M is: selecting a set number of mobile communication terminals, the set number is sufficient to correctly reflect all mobile communication terminals. Statistical law, respectively test the second RF signal field strength value of each mobile communication terminal at the farthest detection point and the close distance detection point, and calculate the mobile communication terminal at the farthest point The difference between the second RF signal field strength at the detection point and the second RF signal field strength at the proximity detection point, wherein the smallest difference is selected as the M value.

Further, the above method may further have the following features. In the step d, the threshold adjustment value Pgate-adj is used to adjust the distance control threshold Pgate, and the value of the threshold adjustment value Pgate_adj satisfies the following principles: 1) is larger than the typical dispersion of channel transmission Value; 2) greater than the calibrator calibration error; 3) less than the Pgate value; 4) using Pgate - Pgate.adj as the threshold, the corresponding distance does not exceed the nearest neighbor user distance required by the application.

Further, the foregoing method may further have the following features. Before the step a, the method further includes: Step e: calibrating the mobile communication terminal on the radio frequency card reading device, acquiring a distance control threshold value Pgate of the mobile communication terminal, and saving to The mobile communication terminal is in the radio frequency subscriber identity module card.

Further, the above method may further have the following features, and the step e includes:

Step el, placing the mobile communication terminal at a set distance from the radio frequency card reading device; step e2, the radio frequency subscriber identity module card on the mobile communication terminal transmits the radio frequency signal according to the set power;

Step e3, the radio frequency card reading device receives the radio frequency signal transmitted by the radio frequency subscriber identity module card, and detects the field strength values of the n radio frequency signals (Pantl, ···, Pantn);

In step e4, the sum of the n field strength values is the distance control threshold value Pgate, that is, Pgate=Pantl + Pant2 + —+?&ntn, or the sum of the partial field strength values is the distance control threshold value Pgate, that is, Pgate= m/n* (Pantl + Pant2 + •••+Pantn) , n>m.

In order to solve the above technical problem, the present invention further provides a radio frequency card reading device, comprising: a main processing module, an interface module respectively connected to the main processing module, a radio frequency transceiver module, and an echo detection radio frequency receiving module, and a first antenna connected to the radio frequency transceiver module and a second antenna connected to the echo detection radio frequency receiving module, wherein:

The radio frequency transceiver module is configured to transmit a first radio frequency signal through the first antenna, that is, an echo detection radio frequency signal, receive a second radio frequency signal transmitted by the mobile communication terminal, and detect a field strength of the second radio frequency signal Value, sent to the main processing module;

The echo detection radio frequency receiving module is configured to receive the first radio frequency signal in the non-swipe state through the second antenna, and detect the field strength value of the first radio frequency signal, and send the field strength value to the main processing module;

The main processing module is configured to analyze whether the communication distance of the mobile communication terminal can be swiped according to the field strength values of the first radio frequency signal and the second radio frequency signal, and if yes, perform a card swipe process, otherwise the card is not swiped;

The interface module is configured to implement communication between the main processing module and the upper system of the radio frequency card reading device. The invention can reduce the calibration requirement, and can also limit the maximum communication distance of the radio frequency subscriber identification module card to prevent the accidental accidental brushing problem. DRAWINGS

1 is a schematic structural view of a radio frequency card reading device of the present invention;

2 is a flow chart of a control method of the communication distance of the present invention;

3 is a schematic diagram of a control method of a communication distance according to the present invention;

Figure 4 is a schematic diagram of the structure of a radio frequency SIM card. detailed description

The principles and features of the present invention are described in the following description with reference to the accompanying drawings.

The invention firstly proposes a method for detecting the distance between an object to be detected and a fixed point by using an echo. The main idea of the distance detecting method of the present invention is: transmitting a detection signal at a set power at a fixed point, and receiving a to-be-detected at the fixed point. Detecting a field strength change value of the reflected signal, determining a value of the field strength change value of the reflected signal and a distance between the object to be detected and the fixed point, and determining the object to be detected and the fixed point The distance between them.

The detecting the field strength change value of the reflected signal may specifically: detecting the received at the fixed point Detecting the total field strength value of the signal, the field strength change value of the reflected signal is equal to the difference between the total field strength value and the field strength value of the directly coupled signal, wherein the direct coupled signal is the detection received at the fixed point without the object to be detected signal.

Correspondingly, the present invention provides a distance detecting device for implementing the above-described distance detecting method. The distance detecting device of the present invention comprises a transmitting module, a receiving module, a detecting module and a distance determining module, wherein the transmitting module is used at a fixed point Receiving a detection signal at a set power; receiving module for receiving a reflected signal of the detection signal on the detection signal at the fixed point; detecting module for detecting a field strength change value of the reflected signal; and determining, by the distance determining module, the reflection The correspondence between the field strength change value of the signal and the distance between the object to be detected and the fixed point determines the distance between the object to be detected and the fixed point.

Based on the above distance detecting method, the present invention also proposes a radio frequency card reading device and a communication distance control method.

1 is a schematic structural view of a radio frequency card reading device of the present invention. As shown in FIG. 1, the radio frequency card reading apparatus 100 of the present invention includes a main processing module 101, an interface module 102 connected to the main processing module 101, a radio frequency transceiver module 103 and an echo detection radio receiving module 104, and a radio frequency transceiver. The first antenna 106 connected to the module 103 and the second antenna 105 connected to the echo detecting radio frequency receiving module 104. The first antenna 106 is a multi-directional antenna, and the second antenna 105 is a unidirectional antenna. The radio frequency transceiver module 103 is configured to transmit the first radio frequency signal by using the first antenna 106, that is, the echo detection radio frequency signal 201, receive the second radio frequency signal transmitted by the mobile communication terminal, and detect the field strength value of the second radio frequency signal, and send The main processing module 101 is configured to receive the first radio frequency signal in the non-swipe state through the second antenna 105, that is, the echo detection radio frequency signal, and detect the field strength value of the first radio frequency signal (the first The field strength value of a radio frequency signal is equal to the superposition value of the reflected signal 202 of 201 and 201, and is sent to the main processing module 101. The main processing module 101 is configured to analyze the mobile according to the field strength values of the first radio frequency signal and the second radio frequency signal. Whether the communication distance of the communication terminal can be swiped, if yes, the card swipe process is performed, otherwise the card is not swiped; the interface module 102 is used to implement the upper processing system of the main processing module 101 and the radio frequency card reading device 100 (such as the information of each radio frequency reading device) On Level PC) communication.

The invention realizes the distance control by using the echo detection principle. The principle of the echo detection is as follows: When the mobile communication terminal terminal 300 is not close to the radio frequency card reading device, the echo detection radio frequency receiving module 104 detects from the antenna 105 that the radio frequency transceiver module 103 is received by the antenna 106. A direct coupled signal 201 (ie, the aforementioned first radio frequency signal) is sent, and the signal intensity average is stable on a certain radio frequency card reading device; when the mobile communication terminal 300 approaches the radio frequency card reading device, the reflected signal is superimposed on the antenna 105. 202 (202 is a reflected signal generated by the signal 201 being reflected by the mobile communication terminal), and the first radio frequency signal received by the echo detection radio receiving module 104 becomes stronger as the distance of the mobile communication terminal is close, and the first can be established according to the statistical characteristics. The relationship between the field strength change value of a radio frequency signal and the distance (ie, the distance of the mobile communication terminal from the radio frequency card reading device), thereby indirectly obtaining the distance value of the mobile communication terminal from the radio frequency card reading device. In order to stabilize the distance detection, the filtering method is used to filter the noise jitter. The filtering algorithm uses the mean value of the detected field strength within the settable time length as the field strength mean of the mobile communication terminal, and the mobile communication terminal is close to the field strength. The change is relative to the mean.

2 is a flow chart of a control method of the communication distance of the present invention. The control method of the communication distance of the present invention is completed by the above-mentioned radio frequency card reading device 100, and the interaction process between the radio frequency card reading device 100 and the mobile communication terminal 300 is as shown in FIG. We use the RF SIM card as an example to illustrate the structure of the RF subscriber identity module card. 4 is a schematic structural view of a radio frequency SIM card. The radio frequency SIM card 301 is a subscriber identity module with radio frequency wireless communication function, including a card body and an integrated circuit in the card body. The card body is provided with an interface that can be matched with the SIM card holder of the mobile communication terminal, and the integrated circuit in the card body includes The central processing unit 3011, the radio frequency SIM card memory 3012 connected to the central processing unit 3011, the radio frequency transceiver circuit 3014 and the interface circuit 3013, and the radio frequency transceiver antenna 3015 connected to the radio frequency transceiver circuit 3014, by means of the interface circuit 3013 and the radio frequency SIM card body The upper interface, the radio frequency SIM card 301 is connected to the circuit board of the mobile communication terminal 300. The radio frequency SIM card 301 can communicate with the mobile communication terminal 300 to implement the standard functions of the conventional SIM card, and can also be connected to the peripheral processing device (for example, the radio frequency card reading device 100) within a short distance through the radio frequency transceiver circuit 3014 and the radio frequency transceiver antenna 3015. Communication, on The communication content and process are specifically processed by the central processing unit 3011 in the radio frequency SIM card 301. When necessary, the central processing unit 3011 sends an instruction to the mobile communication terminal according to a standard protocol through the data line on the SIM card holder of the mobile communication terminal 300. Control the screen display and keyboard input of the mobile communication terminal. The radio frequency SIM card 301 is mostly used for the mobile communication terminal 300. In addition to having all the functions of the conventional SIM card, the mobile communication terminal can also have smart cards such as a bus pass card, an access pass card, a credit card, a micro payment card, and a time card. The function, and the information generated during the use of various smart cards can be directly displayed on the screen of the mobile communication terminal, and the user can complete various operations through the keyboard of the mobile communication terminal.

As shown in FIG. 2, the control method of the communication distance of the present invention includes:

Step 210: Calibrate the mobile communication terminal on the radio frequency card reading device, obtain the distance control threshold value Pgate of the mobile communication terminal, and save it to the radio frequency subscriber identification module card of the mobile communication terminal;

The calibration process is a one-time process before the mobile communication terminal 300 is used, and the card reading operation can be performed on the RF card reader device 100 after calibration. Each mobile communication terminal corresponds to a distance control threshold Pgate. The distance control thresholds of different mobile communication terminals may be different. Therefore, each mobile communication terminal must be calibrated to obtain its own Pgate value.

This step is a preparation work of the radio frequency card reading device before the distance control is performed. After obtaining the distance control threshold value Pgate of the mobile communication terminal, it is saved in the radio frequency subscriber identification module card of the mobile communication terminal, and the subsequent movement is performed. During the distance control process of the communication terminal, the radio frequency card reading device acquires the distance control threshold value Pgate of the mobile communication terminal, and the radio frequency card reader uses the Pgate value of the mobile communication terminal during the communication process with the current mobile terminal, until Another mobile communication terminal establishes communication. This step only needs to be performed once, and this step does not need to be repeated during the subsequent distance control.

Step 210 can be accomplished by substeps 211 through 214 below:

Step 211: Place the mobile communication terminal at a set distance from the radio frequency card reading device; Step 212: The radio frequency subscriber identity module card on the mobile communication terminal transmits the radio frequency signal according to the set power.

Step 213, the radio frequency card reading device receives the radio frequency signal transmitted by the radio frequency subscriber identity module card, and detects the field strength values of the n radio frequency signals (Pantl, ···, Pantn);

Step 214, taking the sum of the n field strength values as the distance control threshold value Pgate, that is, Pgate= Pantl + Pant2 + •• Pantn, or taking the sum of the partial field strength values as the distance control threshold value Pgate, that is, Pgate= m /n* (Pantl + Pant2 + •••+Pantn) , n>m.

For example, the radio frequency transceiver module 103 of the radio frequency card reading device sequentially receives the respective receiving antennas on the first antenna 106, receives the radio frequency signals sent by the radio frequency SIM card, and detects n antenna field strength values (Pantl, ..., Pantn). The distance control threshold Pgate is defined as the sum of the respective field strength values Pgate= Pantl + Pant2 + -·+?Άηίη, or the sum of partial field strength values, such as Pgate= m/n* (Pantl + Pant2 + •••+ Pantn), n>m.

Step 220: detecting whether the mobile communication terminal enters the farthest detection range, and if yes, triggering the radio frequency subscriber identity module card of the mobile communication terminal to transmit the second radio frequency signal, and recording the radio frequency subscriber identification module of the mobile communication terminal at the farthest detection point The field strength value Rmaxdis of the second radio frequency signal transmitted by the card is recorded, so that the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting the second radio frequency signal, and step 230 is performed. Otherwise, it is continued to detect whether the mobile communication terminal enters the farthest detection range, that is, Step 220 is repeated, wherein the farthest detection range is preset by the radio frequency card reading device, and the farthest detection point is a point on the edge of the farthest detection range;

The detection process of step 220 can be accomplished by the following sub-steps 221 to 224:

Step 221, preset the echo detection mean MDavg;

In the case that there is no mobile communication terminal or other echo object around the radio frequency card reading device, the radio frequency transceiver module 103 of the radio frequency card reading device transmits the echo detection radio frequency signal 201 through the antenna fixed on the first antenna 106 (ie, the first radio frequency signal) The main processing module 101 detects the non-swipe operation state by the echo detection radio frequency receiving module 104, and obtains the non-swipe operation status. The wave detects the average field strength of the RF signal 201, which is set to the echo detection mean MDavg.

Step 222, preset a farthest detection distance threshold MDmaxdis, MDmaxdis is a minimum field strength change value that can be detected according to the echo detection obtained by the test;

Step 223: In actual operation, the RF receiving module 104 and the second antenna 105 receive the first radio frequency signal emitted by the radio frequency card reading device and the reflected signal of the mobile radio terminal to the first radio frequency signal. The real-time field strength value MDrt of the first radio frequency signal at the moment;

Step 224: Determine whether the difference between the real-time field strength value MDrt and the echo detection mean MDavg (MDrt-MDavg) is greater than the farthest detection distance threshold MDmaxdis. If yes, determine that the mobile communication terminal enters the farthest detection range, otherwise determine the mobile communication. The terminal did not enter the farthest detection range.

In other embodiments of the invention, step 220 may not be included, but step 230 may proceed directly to step 230.

Step 230: Detect whether the mobile communication terminal enters a short-range detection range, and if yes, trigger a radio frequency subscriber identity module card of the mobile communication terminal to transmit a second radio frequency signal, and record the radio frequency user identification of the mobile communication terminal at a close-range detection point. The field strength value Rclosedis of the second radio frequency signal transmitted by the module card is recorded, so that the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting the second radio frequency signal, and step 240 is performed, otherwise, it is continued to detect whether the mobile communication terminal enters the short-range detection range. , that is, step 230 is repeated, wherein the short-range detection range is preset by the radio frequency card reading device, and the short-distance detection point is a point on the edge of the close-range detection range;

The detection process of step 230 can be accomplished by the following sub-steps 231 to 233:

Step 231, preset the echo detection mean MDavg, this step is the same as step 221; Step 232, preset the proximity detection distance, and detect the first RF signal received by the RF card reader relative to the echo detection mean MDavg Typical field strength change, The short-range detection threshold value MDc 10 s ed is , the value satisfies MDclosedis > MDmaxd is; Step 233, real-time receiving the first radio frequency signal emitted by the radio frequency card reading device and the mobile communication terminal to the first radio frequency signal a reflected signal, obtaining a real-time field strength value MDr t of the first radio frequency signal at the moment;

Step 234, determining whether the difference between the real-time field strength value MDrt and the echo detection mean MDavg (MDrt-MDavg) is greater than the near-majority detection; and the threshold value MDclosedis(MDrt - MDavg)

< MDclosedis ), if yes, it is determined that the mobile communication terminal enters the close range detection range, otherwise it is determined that the mobile communication terminal does not enter the close range detection range.

Step 240: Determine whether the difference between Rclosedis and Rmaxdis is greater than a preset dynamic threshold M. If yes, trigger the radio frequency subscriber identity module card of the mobile communication terminal to transmit a second radio frequency signal, and record the field strength of the second radio frequency signal. Values, step 250 is performed, otherwise step 270 is performed; in other embodiments of the invention, step 240 may not be included, but step 250 is directly entered into step 230.

The dynamic threshold value M in this step can be tested by a large number of different types of mobile communication terminals, and is statistically analyzed and set according to experience. Specifically, the method for determining the M value is: selecting a set number of mobile communication terminals, the set number satisfies the statistical rule that can correctly reflect all mobile communication terminals, and respectively tests each mobile communication terminal at the farthest detection point and near Calculating a difference between the second RF signal field strength value at each of the mobile communication terminals at the farthest detection point and the second RF signal field strength value at the close distance detection point from the second RF signal field strength value at the detection point The value, where the smallest difference is selected as the M value.

Step 250: Obtain a distance control threshold value Pgate of the mobile communication terminal, and determine whether the field strength value of the second radio frequency signal is greater than a difference between the distance control threshold value Pgate and the threshold adjustment value Pgate_ad j. If yes, execute step 260. Otherwise, step 270 is performed;

The method for obtaining the distance control threshold Pgate of the mobile communication terminal may be that the radio frequency card reading device sends a read distance control threshold to the radio frequency subscriber identity module card of the mobile communication terminal. After the request of the value Pgate, the radio frequency subscriber identity module card of the mobile communication terminal transmits the distance control threshold value Pgate to the radio frequency card reading device after receiving the read request.

The threshold adjustment value Pgate_adj in this step is used to adjust the distance control threshold Pgate, and the threshold adjustment value Pgate_adj is also set according to the actual test experience. Specifically, the value of the threshold adjustment value Pgate_adj satisfies the following principles: 1) is larger than the typical discrete value of the channel transmission, for example, the typical discrete value is 3 dB, and the Pgate_adj value must be greater than 3 dB; 2) is greater than the calibrator calibration error, for example, the calibration error is 2dB, Pgate-adj value must be greater than 3dB; 3) less than Pgate value; 4) Pgate-Pgate-adj is used as the threshold, echo detection control is not used, and the corresponding distance does not exceed the nearest neighbor user distance required by the application. For example, the distance of the queue.

Step 260, starting the card swiping process;

Step 270: The card scanning process is not started, and the distance control process is ended.

When the mobile communication terminal is very close, the effect of adjusting the value is basically equivalent to the threshold not controlling. The adjusted threshold can always be swiped when the channel transmission parameter is discrete within a certain range. At the same time, the threshold can also be avoided when there is no control at all. In the vicinity, the mobile communication terminal triggers echo detection, and the distant mobile communication terminal (such as mobile phone) is accidentally brushed due to no control at all.

The radio frequency subscriber identity module card in the present invention may include a radio frequency SIM card, a radio frequency UIM card, and a radio frequency USIM card.

The frequency band in which the radio frequency card reading and receiving device transmits and receives radio frequency signals may be an ultra high frequency SHF frequency band, a very high frequency VHF frequency band or a very high frequency UHF frequency band. Of course, the radio frequency SIM card also works in a corresponding frequency band, that is, an operating frequency band of the radio frequency SIM card. It is consistent with the operating frequency band of the RF card reader.

The invention can reduce the calibration requirement, and can also limit the maximum communication distance of the radio frequency subscriber identification module card to prevent the accidental accidental brushing problem.

Step 220 and step 230 may also be performed according to the situation. The distance control process after the tube is: the field strength of the mobile communication terminal transmitting the radio frequency signal satisfies the card threshold of step 210, and the card reader echo detection circuit is started, and the detection is started. Is there a mobile communication terminal that enters the proximity detection range, such as If the mobile communication terminal enters the short-range detection range, the mobile communication terminal is started to transmit the second radio frequency signal, and the radio frequency card reading device detects the second radio frequency signal, and the second radio frequency signal is stronger than (Pgate-Pgate-adj), and the card is allowed to be swiped, and vice versa. No card is allowed.

The barreling process is relatively weak in preventing accidental mis-wiping and can be used in applications where the flow density is not very high.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A distance detecting method, characterized in that a detection signal is transmitted at a set power at a fixed point, and a reflected signal of the detection signal to the detection signal is received at the fixed point, and a field strength change value of the reflected signal is detected. Determining a distance between the object to be detected and the fixed point according to a correspondence between a field strength change value of the reflected signal and a distance between the object to be detected and the fixed point.

The distance detecting method according to claim 1, wherein the detecting the field strength change value of the reflected signal is specifically: detecting a total field strength value of the detected signal received at the fixed point, the reflected signal The field strength change value is equal to the difference between the total field strength value and the field strength value of the directly coupled signal, and the direct coupled signal is the detection signal received at the fixed point without the object to be detected.

3. A distance detecting device, comprising:

a transmitting module, configured to transmit a detection signal at a set power at a fixed point;

A control method for communication distance, characterized in that it comprises:

Step a, detecting whether the mobile communication terminal enters the farthest detection range, and if so, triggering the radio frequency subscriber identity module card of the mobile communication terminal to transmit the second radio frequency signal, and recording the radio frequency subscriber identification module of the mobile communication terminal at the farthest detection point The field strength value Rmaxd is of the second radio frequency signal transmitted by the card, after recording, the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting the second radio frequency signal, and step b is performed, otherwise step a is repeated;

Step b, detecting whether the mobile communication terminal enters the short-range detection range, and if so, triggering the radio frequency subscriber identity module card of the mobile communication terminal to transmit the second radio frequency signal, and recording the radio frequency user identification of the mobile communication terminal at the close-range detection point Field strength of the second RF signal emitted by the module card The value Rc losedi s , after recording, the radio frequency subscriber identity module card of the mobile communication terminal stops transmitting the second radio frequency signal, and performs step c, otherwise repeating step b;

The method for controlling a communication distance according to claim 1, wherein in the step a, the farthest detection range is preset by a radio frequency card reading device, and the farthest detection point is a farthest detection. The point on the edge of the range.

The method for controlling the communication distance according to claim 1, wherein the detecting process in the step a includes:

Step a 1 , preset echo detection mean MDavg;

Step a2, preset the farthest detection distance threshold MDmaxd i s , MDmaxd i s is the minimum field strength change value that can be detected according to the echo detection obtained by the test;

Step a3, real-time receiving the first radio frequency signal emitted by the radio frequency card reading device and the reflected signal of the first radio frequency signal by the mobile communication terminal, and obtaining the real time field strength value MDr t of the first radio frequency signal at the moment;

Step a4, determining whether the difference between the real-time field strength value MDr t and the echo detection mean MDavg is greater than the farthest detection distance threshold MDmaxdi s, and if so, determining that the mobile communication terminal enters the farthest detection range, otherwise determining that the mobile communication terminal does not enter The farthest detection range.

The control method of the communication distance according to claim 1, wherein in the step b, the short-range detection range is preset by a radio frequency card reading device, and the short-distance detection point is a close-range detection. The point on the edge of the range.

The control method of the communication distance according to claim 1, wherein the detection process in the step b includes:

Step bl, preset echo detection mean MDavg;

The method for controlling the communication distance according to claim 1, wherein in the step c, the method for determining the dynamic threshold value M is: selecting a set number of mobile communication terminals, the set quantity is satisfied It can correctly reflect the statistical rules of all mobile communication terminals, and test the second RF signal field strength values of each mobile communication terminal at the farthest detection point and the close distance detection point respectively, and calculate the mobile communication terminal at the farthest detection point. The difference between the second RF signal field strength value and the second RF signal field strength value at the close detection point, wherein the smallest difference is selected as the M value.

The control method of the communication distance according to claim 1, wherein in the step d, the threshold adjustment value Pgate_adj is used to adjust the distance control threshold Pgate, the threshold adjustment value.

The value of Pgate_adj satisfies the following principles: 1) greater than the typical discrete value of channel transmission; 2) greater than the calibration error of the calibrator; 3) less than the Pgate value; 4) using Pgate-Pgate-adj as the threshold, the corresponding distance does not exceed the application The nearest neighbor user distance required.

The method for controlling the communication distance according to any one of claims 4 to 10, wherein the step a further comprises: step e, the mobile communication terminal is installed in the radio frequency card reading device The distance control threshold value Pgate of the mobile communication terminal is obtained and saved in the radio frequency subscriber identity module card of the mobile communication terminal.

The method for controlling a communication distance according to claim 11, wherein the step e comprises:

A radio frequency card reading device, comprising: a main processing module, an interface module respectively connected to the main processing module, a radio frequency transceiver module and an echo detection radio receiving module, and a first connection with the radio frequency transceiver module An antenna and a second antenna connected to the echo detecting radio frequency receiving module, wherein:

The radio frequency transceiver module is configured to transmit the first radio frequency signal by using the first antenna, that is, the echo detection radio frequency signal, receive the second radio frequency signal transmitted by the mobile communication terminal, and detect the field strength value of the second radio frequency signal, and send the field strength value to the main processing module. ;

The interface module is configured to implement communication between the main processing module and the upper system of the radio frequency card reading device.