A tamper-resistant method for an electronic device and a corresponding electronic device

Abstract

The application discloses a kind of anti-disassembly method for electronic equipment and corresponding electronic equipment, comprising the following steps: setting reference surface, installing electronic equipment;Ultrasonic sensor obtains the distance data of ultrasonic sensor and reference surface different position and compares distance data with initial value, obtains the distance change state of electronic equipment in current data acquisition period;Acceleration sensor records the space posture information collected in different data acquisition periods and compares with initial value respectively, obtains the posture change state of electronic equipment in current data acquisition period;With microprocessor, the corresponding distance change state and posture change state in electronic equipment in the same data acquisition period are analyzed, and whether electronic equipment is disassembled is judged.The method solves the problem of poor stability and poor judgment sensitivity in the existing anti-disassembly method, has the advantages of anti-interference, more intelligent result judgment, and higher alarm accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic device anti-disassembly, in particular to an anti-disassembly method for electronic device and corresponding electronic device. BACKGROUND

[0002] Traditional electronic devices mostly adopt mechanical structure to prevent disassembly, for example, a protruding part is arranged on the device shell, and a button is arranged on the corresponding position of the PCB, the output interface of the button is connected with the IO interface of the micro control unit in the PCB by pressing the button with the protruding part on the shell. Once the device is disassembled by a person, the protruding part of the device shell will be separated from the contact surface of the button, and then the output interface of the button and the IO interface of the micro control unit in the PCB are disconnected, so that the input state of the IO interface in the micro control unit changes, and the PCB alarms immediately. Although this mechanical anti-disassembly structure has low cost and low energy consumption, it has many limitations in use. On the one hand, the device reliability is poor, because the button is pressed to different heights, it may cause the button to be triggered by mistake during transportation or installation, and the device alarm is false; on the other hand, the button is at risk of being stuck, and once the button is stuck, the anti-disassembly structure of the device will be directly disabled.

[0003] In addition, another anti-disassembly method is to use infrared device, which emits infrared rays to the outside, receives the reflected probe light, and analyzes whether the device is moved or disassembled by a person, but this method is limited by the use scene, and often alarms due to false judgment of infrared. In order to prevent this situation, a more intelligent anti-disassembly method is extremely needed.

[0004] It can be seen that the above-mentioned existing anti-disassembly method has certain defects in use stability and judgment sensitivity, and needs to be further improved. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an anti-disassembly method for electronic device and corresponding electronic device, which solves the problems of poor stability and poor judgment sensitivity in the existing anti-disassembly method, and overcomes the shortcomings of the prior art.

[0006] To solve the above technical problems, the present application provides an anti-disassembly method for electronic device, which comprises an ultrasonic sensor, an acceleration sensor and a microprocessor, and the anti-disassembly method comprises the following steps:

[0007] After the electronic device is installed in place, the reference surface of the ultrasonic sensor is set;

[0008] The ultrasonic sensor emits a plurality of ultrasonic beams A to the reference surface at different angles j , and receives the reflected sound waves a reflected by the reference surfacej To obtain distance data P between the ultrasonic sensor and the reference surface at different positions. j The ultrasonic sensor records the distance values ​​P acquired by each ultrasonic beam within different data acquisition cycles according to a preset data acquisition cycle. jt And set the initial value P for the distance data of each ultrasonic beam. j0 The collected distance data P jt With initial value P j0 Comparisons are made to obtain the distance change status of the electronic device within the current data acquisition cycle, where t = 0, 1, 2, ..., n; t represents n different data acquisition cycles, and j represents different ultrasonic beams emitted by the ultrasonic sensor.

[0009] The accelerometer records the spatial attitude information F collected in different data acquisition cycles according to the data acquisition cycle. t (x,y,z); the initial value F0(x,y,z) for pre-acquiring spatial attitude information, and the subsequent acquired spatial attitude information F t (x,y,z) are compared with the initial value F0(x,y,z) to obtain the attitude change state of the electronic device in the current data acquisition cycle, where t=0,1,2,...,n; t represents n different data acquisition cycles, and x,y,z represent acceleration values ​​in different directions in the electronic device;

[0010] The microprocessor is used to analyze the distance and attitude changes of the electronic device within the same data acquisition cycle, and to determine whether the corresponding electronic device has been disassembled within the current data acquisition cycle.

[0011] As an improvement of the present invention, the ultrasonic sensor will collect the distance data P jt With initial value P j0 The specific method of comparison is as follows:

[0012] First, according to different ultrasonic beams A j Initial value P of the medium distance value j0 Count the number of items and record the initial value P. j0 The number is m,

[0013] Different ultrasonic beams A j Distance values ​​P collected at different data acquisition periods jt Each with the corresponding ultrasonic beam A j initial value P j0 The comparison was performed, and the distance value P that exceeded the comparison error was... jt Count the number of items k.

[0014] According to different data acquisition periods, the distance change state in the corresponding data acquisition period is obtained as k / m*100%.

[0015] As a further improvement of the application, the acceleration sensor compares the spatial posture information F t The specific method of (x, y, z) and the initial spatial value F0(x, y, z) is:

[0016] In different data acquisition periods, the spatial posture information F t (x, y, z) is compared with the calibrated initial value F0(x, y, z): the acceleration values in each direction in the collected spatial posture information are compared with the corresponding acceleration values in each direction in the initial value, the number of acceleration values in each direction in the spatial posture information that exceeds the comparison error in the current data acquisition period is counted, and the posture change state of the electronic device in the current data acquisition period is obtained.

[0017] As an improvement of the application, the initial value P j0 The acquisition method is: the ultrasonic sensor selects at least three distance values of the initial position from the distance values P jt recorded by the ultrasonic sensor in different data acquisition periods, and obtains the corresponding average value, and the obtained average value is taken as the initial value P j0 .

[0018] As a further improvement of the application, the comparison error set in the ultrasonic sensor is 0-1%, and the comparison error set in the acceleration sensor is 0-10%.

[0019] As an improvement of the application, the specific steps of the microprocessor judging whether the corresponding electronic device in the current data acquisition period is disassembled are:

[0020] When the distance change state of the ultrasonic sensor in a certain data acquisition period is greater than the preset distance threshold P 阀 , that is, k / m*100%>P 阀 , and the duration of the distance change state is greater than or equal to 5s, the next step is performed.

[0021] The posture change state collected by the acceleration sensor in the same data acquisition period is continuously judged, and when the acceleration values of any two directions change, it can be judged that the current electronic device is disassembled.

[0022] As a further improvement of the application, the specific steps of the microprocessor judging whether the corresponding electronic device in the current data acquisition period is disassembled are:

[0023] When the distance change state of the ultrasonic sensor in a certain data collection period reaches 100%, and the duration of the distance change state is less than 5s, the next step is performed;

[0024] The posture change state collected by the acceleration sensor in the same data collection period is determined, and when the acceleration values in each direction do not change, it is determined that the current electronic device is not disassembled;

[0025] Meanwhile, according to the distance data corresponding to each ultrasonic beam collected by the ultrasonic sensor in the current data collection period, the distance data corresponding to each ultrasonic beam collected in the current data collection period is replaced by the initial value P of each ultrasonic beam j0 .

[0026] As a further improvement of the present application, the specific steps of the microprocessor for determining whether the corresponding electronic device is disassembled in the current data collection period are:

[0027] When the distance change state of the ultrasonic sensor in a certain data collection period reaches 100%, and the duration of the distance change state is greater than or equal to 5s, the next step is performed;

[0028] The distance data corresponding to each ultrasonic beam collected by the ultrasonic sensor in the current data collection period is continuously determined, and if the distance data is less than 10cm, it is determined that the current electronic device is disassembled, and if not, the distance data corresponding to each ultrasonic beam in the current data collection period is continuously monitored.

[0029] As a further improvement of the present application, the data collection period interval is set to 1s.

[0030] In addition, the present application also discloses an electronic device, which comprises an ultrasonic sensor, an acceleration sensor, a microprocessor and an internal storage unit thereof, the microprocessor is in communication connection with the ultrasonic sensor and the acceleration sensor, and the data transmitted by the ultrasonic sensor and the acceleration sensor is stored in the internal storage unit of the microprocessor;

[0031] The microprocessor loads the computer program to enable the electronic device to perform the above-mentioned anti-disassembly method.

[0032] After adopting such design, the present application at least has the following advantages:

[0033] The anti-disassembly method of the present application measures the distances from the device to different points on the reference surface by periodically emitting multi-angle ultrasonic beams by the ultrasonic sensor, and compares the newly detected distance data with the initial data one by one, and combines the directional acceleration values x, y, z periodically obtained by the acceleration sensor, and compares the newly obtained directional acceleration values with the initial values. In the present application, by comprehensively analyzing and judging the data obtained by combining the ultrasonic sensor and the acceleration sensor, it can be accurately judged whether the electronic device is disassembled, and it can intelligently identify whether the current electronic device is disassembled by human or environmental interference, the result of the judgment is more intelligent, and the accuracy of triggering the alarm is higher. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the following will be further described in detail in combination with the drawings and specific embodiments.

[0035] Figure 1 is the ranging principle diagram of the ultrasonic sensor in the embodiment of the present application.

[0036] Figure 2 is the installation structure schematic diagram of the electronic device and the ultrasonic sensor and the acceleration sensor in the embodiment of the present application.

[0037] Figure 3 is the state schematic diagram of the ultrasonic beam located on the reference surface in the embodiment of the present application.

[0038] Figure 4 is the flowchart of the anti-disassembly method in the embodiment of the present application.

[0039] In the drawings, the reference signs are as follows:

[0040] 1-electronic device; 2-ultrasonic sensor; 3-reference surface; 4-point formed by the ultrasonic beam emitted to the reference surface; 5-acceleration sensor. DETAILED DESCRIPTION

[0041] The examples of the embodiments described in the present application are shown in the drawings, wherein the same or similar reference signs represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] See Figures 1-3 As shown, this embodiment 1 specifically discloses a method for preventing disassembly of electronic devices. The electronic device 1 includes an ultrasonic sensor 2, an accelerometer 5, and a microprocessor, such as... Figure 4 As shown, this anti-disassembly method includes the following steps:

[0044] The first step is to install the electronic device 1 in place and set the reference surface 3 of the ultrasonic sensor 2. It should be noted that in this embodiment, the reference surface 3 can be the ground or a flat plate, etc. In actual use, the reference surface 3 will not be a completely flat surface, and there may be different objects on it.

[0045] The second step is to combine Figure 1 The schematic diagram of ultrasonic ranging shows that the ultrasonic sensor includes a computing unit, a transmitter, and a receiver. When the ultrasonic sensor performs ranging, the computing unit executes a transmission program, driving the transmitter to emit multiple ultrasonic beams towards the obstacle. The ultrasonic beams are blocked by the obstacle, forming reflected beams, which are reflected back to the receiver. The receiving processing program in the computing unit processes the signal at the receiver. Preferably, according to the ultrasonic ranging principle d = c * T / 2, where c is the speed of sound in the medium and T is the time interval between the ultrasonic signal being emitted and received, the computing unit finally obtains the corresponding distance data. In this embodiment, ultrasonic sensor 2 emits multiple ultrasonic beams A at different angles towards reference surface 3. j And receive the reflected sound wave a from reference surface 3. j Acquire distance data P between ultrasonic sensor 2 and reference surface 3 at different positions. j In this embodiment, the ultrasonic sensor 2 converts electrical energy into acoustic energy through the piezoelectric effect and emits several ultrasonic beams at different angles toward the reference surface 3. The emitted beams are designed to avoid concentrating at a single point, and are distributed evenly across multiple points within the maximum measurement distance and the reference surface area. The distribution structure of the points 4 formed by the ultrasonic beams emitting onto the reference surface in this embodiment is as follows: Figure 3 As shown; in this embodiment, the ultrasonic sensor 2 records the distance values ​​P acquired by each ultrasonic beam within different data acquisition cycles according to a preset data acquisition cycle. jtThe preferred data acquisition cycle is set to 1 time / s, and the initial value P of the distance data for each ultrasonic beam is set. j0 In this embodiment, the initial value P of the ultrasonic sensor 2 j0 The method for obtaining the distance value P is as follows: the ultrasonic sensor 2 obtains the distance value P from different data acquisition periods. jt Select at least three distance values ​​from the initial position and obtain their average values. Use the average value as the initial value P. j0 .

[0046] Then the collected distance data P jt With initial value P j0 By comparison, the distance change status of electronic device 1 within the current data acquisition cycle is obtained, where t = 0, 1, 2, ..., n; t represents n different data acquisition cycles, and j represents different ultrasonic beams emitted by the ultrasonic sensor;

[0047] Furthermore, in this embodiment, the ultrasonic sensor 2 will collect the distance data P. jt With initial value P j0 The specific method of comparison is as follows:

[0048] First, according to different ultrasonic beams A j Initial value P of the medium distance value j0 Count the number of items and record the initial value P. j0 The number is m,

[0049] Different ultrasonic beams A j Distance values ​​P collected at different data acquisition periods jt Each with the corresponding ultrasonic beam A j initial value P j0 The comparison was performed, and the distance value P that exceeded the comparison error was... jt The number of statistical tests k is calculated. In this preferred embodiment, the comparison error set in the ultrasonic sensor 2 is 0-1%.

[0050] The distance change within the corresponding data collection period is obtained as k / m×100% according to different data collection periods.

[0051] Third, the accelerometer 5 records the spatial attitude information F collected in different data acquisition cycles according to the data acquisition cycle. t (x,y,z); the initial value F0(x,y,z) for pre-acquiring spatial attitude information, and the subsequent acquired spatial attitude information F t(x,y,z) are compared with the initial value F0(x,y,z) to obtain the attitude change state of electronic device 1 in the current data acquisition cycle, where t=0,1,2,...,n; t represents n different data acquisition cycles, and x,y,z represent acceleration values ​​in different directions in the electronic device;

[0052] More specifically, in this embodiment, the accelerometer 5 compares the spatial attitude information F t The specific method for finding (x,y,z) and the initial value F0(x,y,z) is as follows:

[0053] Spatial attitude information F during different data acquisition cycles t The acceleration values ​​(x, y, z) are compared with the calibrated initial value F0(x, y, z): the acceleration values ​​in each direction of the acquired spatial attitude information are compared with the corresponding acceleration values ​​in each direction of the initial value, and the number of acceleration values ​​in each direction that exceed the comparison error in the spatial attitude information within the current data acquisition cycle is counted to obtain the attitude change state of electronic device 1 within the current data acquisition cycle. The comparison error set in the accelerometer 5 is 0-10%.

[0054] The fourth step involves using a microprocessor to analyze the corresponding distance and attitude changes in electronic device 1 within the same data acquisition cycle, and determining whether electronic device 1 has been disassembled within the current data acquisition cycle.

[0055] The specific method by which the microprocessor determines whether the corresponding electronic device 1 has been disassembled during the current data acquisition cycle is as follows:

[0056] Method 1:

[0057] When the distance change of ultrasonic sensor 2 within a certain data acquisition period exceeds the preset distance threshold P 阀 That is, k / m × 100% > P 阀 In this embodiment, a distance threshold P is preferred. 阀 If the percentage is 95% and the duration of the distance change state is greater than or equal to 5 seconds, proceed to the next step.

[0058] Continue to judge the attitude change status collected by the accelerometer 5 within the same data acquisition cycle. When the acceleration values ​​in any two directions change, it can be determined that the current electronic device 1 has been disassembled.

[0059] Method 2:

[0060] When the distance change of ultrasonic sensor 2 reaches 100% within a certain data acquisition cycle, and the duration of the distance change is less than 5 seconds, proceed to the next step.

[0061] When the acceleration sensor 5 collects the posture change state in the same data collection period, if the acceleration value in each direction does not change, it can be judged that the current electronic device 1 is not disassembled;

[0062] Meanwhile, according to the distance data corresponding to each ultrasonic beam collected by the ultrasonic sensor 2 in the current data collection period, the distance data corresponding to each ultrasonic beam collected in the current data collection period is replaced by the initial value P corresponding to each ultrasonic beam j0 .

[0063] Method three:

[0064] When the distance change state of the ultrasonic sensor 2 in a certain data collection period reaches 100%, and the duration of the distance change state is greater than or equal to 5s, the next step is performed;

[0065] Continue to judge whether the distance data corresponding to each ultrasonic beam of the ultrasonic sensor 2 in the current data collection period is less than 10cm, if yes, it is judged that the current electronic device 1 is disassembled, if not, the distance data corresponding to each ultrasonic beam in the current data collection period is continuously monitored.

[0066] The above anti-disassembly method will not be disturbed by the reference surface or the movement of the object in the reference surface, that is, when the object reflection surface is smaller than the area covered by the ultrasonic beam, there will be no false alarm, because the distance change state of the object in a single data collection period is always less than the preset distance threshold P 阀 , which will not trigger the alarm condition. When a special situation occurs, for example, the entire reference surface 3 moves and each distance data changes, but the acceleration sensor 5 does not change, according to the above judgment, false alarm will not occur. Therefore, this method can intelligently identify whether it is disassembled by human or environmental interference, and more intelligently trigger the alarm.

[0067] The anti-disassembly method in the embodiment solves the problems of easy damage, false alarm and great influence of environmental factors of the traditional anti-disassembly device. In the embodiment, the ultrasonic sensor 2 is used as the primary intelligent detection means, and the acceleration sensor is used for judgment. It can intelligently judge whether it is disassembled or caused by environmental factors to trigger the alarm. In addition, the ultrasonic sensor 2 used in the embodiment has no high requirement on installation conditions, only a reference surface is required, which is easy to install, low in construction cost and strong in adaptability

[0068] Further, the embodiment also provides an electronic device, which comprises an ultrasonic sensor, an acceleration sensor, a microprocessor and an internal storage unit thereof, the microprocessor is in communication connection with the ultrasonic sensor and the acceleration sensor, and the data transmitted by the ultrasonic sensor and the acceleration sensor is stored in the internal storage unit of the microprocessor;

[0069] The microprocessor loads the computer program to make the electronic device execute the above-mentioned anti-disassembly method.

[0070] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Those skilled in the art can make some simple modifications, equivalent changes or modifications by using the disclosed technical content, which are all within the protection scope of the present application.

Claims

1. A tamper-proofing method for an electronic device including an ultrasonic sensor, an acceleration sensor, and a microprocessor, characterized by, The anti-disassembly method comprises the following steps: After the electronic device is installed in place, a reference surface of the ultrasonic sensor is initially set; The ultrasonic sensor emits ultrasonic beams A toward the reference surface at different angles. j and receive the reflected sound wave a from the reference surface. j To obtain distance data P between the ultrasonic sensor and the reference surface at different positions. j The ultrasonic sensor records the distance values ​​P acquired by each ultrasonic beam within different data acquisition cycles according to a preset data acquisition cycle. jt And set the initial value P for the distance data of each ultrasonic beam. j0 The collected distance data P jt With initial value P j0 Comparisons are made to obtain the distance change status of the electronic device within the current data acquisition cycle, where t = 0, 1, 2, ..., n; t represents n different data acquisition cycles, and j represents different ultrasonic beams emitted by the ultrasonic sensor. The acceleration sensor records the spatial posture information F collected in different data collection periods respectively t (x,y,z); the initial value F0(x,y,z) of the pre-collected spatial posture information is compared with the subsequently collected spatial posture information F t (x,y,z) respectively, to obtain the posture change state of the electronic device in the current data collection period, wherein t=0, 1, 2,..., n; t respectively represents n different data collection periods, and x, y, and z respectively represent different direction acceleration values in the electronic device. The microprocessor analyzes the corresponding distance change state and the posture change state in the electronic device in the same data collection period, and judges whether the corresponding electronic device in the current data collection period is disassembled; The ultrasonic sensor acquires distance data P jt with the initial value P j0 The specific method for comparison is: First, the different ultrasonic beams A j The initial value P of the middle distance value j0 The number of initial values P j0 The number of initial values P The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A j The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A jt The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A j The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A j0 The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A jt The distance values P collected in different data collection periods are compared with the initial values P of the corresponding ultrasound beams A The distance change state in the corresponding data collection period is k / m*100%, which is obtained according to different data collection periods; The specific steps for the microprocessor to judge whether the corresponding electronic device in the current data collection period is disassembled are as follows: When the distance change state of the ultrasonic sensor in a certain data collection period is greater than a preset distance threshold P 阀 , i.e., k / m x 100% > P 阀 , and the duration of the distance change state is greater than or equal to 5 s, the next step is performed. Continue to judge the posture change state collected by the acceleration sensor in the same data collection period, and when the acceleration values of any two directions change, it can be judged that the current electronic device is disassembled; The specific steps for the microprocessor to judge whether the corresponding electronic device in the current data collection period is disassembled are as follows: When the distance change state of the ultrasonic sensor in a certain data collection period reaches 100%, and the duration of the distance change state is less than 5s, the next step is performed; Judge the posture change state collected by the acceleration sensor in the same data collection period, and when the acceleration values of each direction do not change, it can be judged that the current electronic device is not disassembled; Meanwhile, according to the distance data corresponding to each ultrasonic beam collected by the ultrasonic sensor in the current data collection period, the distance data corresponding to each ultrasonic beam collected in the current data collection period is replaced with the initial value P corresponding to each ultrasonic beam j0 .

2. The tamper-evident method of claim 1, wherein, The acceleration sensor compares the spatial posture information F t The specific method of (x, y, z) and the initial value F0(x, y, z) is: The spatial posture information F t (x,y,z) respectively with the calibrated initial value F0(x,y,z): comparing the acceleration values in each direction in the collected spatial posture information with the corresponding acceleration values in each direction in the initial value, counting the number of acceleration values in each direction in the spatial posture information in the current data collection period that exceed the comparison error, to obtain the posture change state of the electronic device in the current data collection period.

3. The tamper-evident method of claim 1, wherein, The initial value P in the ultrasonic sensor j0 The acquisition method is that the ultrasonic sensor obtains the distance value P of different data acquisition periods jt At least three distance values of the initial position are selected, and the corresponding average value is obtained, and the average value is taken as the initial value P j0 .

4. The tamper-evident method of claim 2, wherein, The comparison error set in the ultrasonic sensor is 0-1%, and the comparison error set in the acceleration sensor is 0-10%.

5. The tamper-evident method of claim 1, wherein, The specific steps for the microprocessor to judge whether the corresponding electronic device in the current data collection period is disassembled are as follows: When the distance change state of the ultrasonic sensor in a certain data collection period reaches 100%, and the duration of the distance change state is greater than or equal to 5s, the next step is performed; Continue to judge whether the distance data corresponding to each ultrasonic beam of the ultrasonic sensor in the current data collection period is less than 10cm, if yes, it is judged that the current electronic device is disassembled, if not, the distance data corresponding to each ultrasonic beam in the current data collection period is continuously monitored.

6. The tamper-evident method of claim 1, wherein, The data collection period interval is set to 1s.

7. An electronic device, comprising: It comprises: An ultrasonic sensor, an acceleration sensor, a microprocessor and a storage unit, the microprocessor is in communication connection with the ultrasonic sensor, the acceleration sensor and the storage unit, and the data transmitted by the ultrasonic sensor and the acceleration sensor is stored in the storage unit; The storage unit stores a computer program; The microprocessor loads the computer program, so that the electronic device executes the anti-disassembly method of any one of claims 1-6.

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