CN106023388A - Electronic lock system capable of identifying location of user with authorized mobile control end and method implemented by electronic lock system - Google Patents
Electronic lock system capable of identifying location of user with authorized mobile control end and method implemented by electronic lock system Download PDFInfo
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- CN106023388A CN106023388A CN201610577149.5A CN201610577149A CN106023388A CN 106023388 A CN106023388 A CN 106023388A CN 201610577149 A CN201610577149 A CN 201610577149A CN 106023388 A CN106023388 A CN 106023388A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00563—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys using personal physical data of the operator, e.g. finger prints, retinal images, voicepatterns
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Abstract
The invention relates to an electronic lock system capable of identifying the location of a user with an authorized mobile control end. The electronic lock system comprises a lock and the mobile control end. The lock comprises a communication module, an audio module, an identity verification module and a control module. The audio module of the lock comprises a door inner audio module and a door outer audio module. The mobile control end comprises a communication module, an identity verification module and an audio module. Audio signals can be emitted by the door inner audio module and the door outer audio module of the lock; the audio signals can be received and processed by the audio module of the mobile control end. Alternately, audio signals can be emitted by the audio module of the mobile control end and can be received and processed by the door inner audio module and the door outer audio module of the lock. The electronic lock system has the advantages that the electronic lock system can be applied to room doors, vehicle doors and the like, the user can open the doors without pulling out a mobile phone and clicking app (application) when the user is close to a door lock and is positioned outside the doors, and accordingly the door opening experience can be effectively improved.
Description
Technical field
The present invention relates to electronic lock technical field, in particular to a kind of electronic lock system that can identify the customer location holding authorized mobile control end.
Background technology
Electronic lock increasingly receives publicity, and can control, with mobile phone, the electronic lock high popularity rate based on current smart mobile phone unblanked, fill a specific APP, be connected to lockset by short-distance wireless communication technology on mobile phone, if certification by; could enter.The kayser that this pattern is more traditional, and coded lock, have on level of security and degree of convenience and bigger must promote.This lockset has safety higher, there is not the problem of carrying, and opens the door simple, and autgmentability is very strong, can support the advantages such as cloud household, Smart Home, Internet of Things.
Due to blue tooth interface popularizing on smart mobile phone, the short-distance wireless communication technology major part of current this electronic lock is all to use low-power consumption Bluetooth technology.Bluetooth module communication on Bluetooth of mobile phone and electronic lock, carries out authentication, controls to unblank.But bluetooth itself is the mobile phone that cannot be distinguished from connecting is in doors or outside room, is potential potential safety hazard.Therefore, currently mainly there is following several way:
One be requirement user when doorway, draw out mobile phone, open APP, then click on the control above APP or button, just can unblank.On the basis of this, for mobile phone in the case of screen locking, user needs first to unlock mobile phone screen, the problem that just can open APP, having a kind of way is when near lock, and mobile phone screen can eject pop-up of unblanking, user, without unlocking screen, clicks directly on the button in pop-up and just can realize unblanking.
Another kind of method be requirement user when doorway, draw out mobile phone, then shake.
Both the above way is similar, is all to need user to draw out mobile phone, could open the door at hands hands-operation, does not accounts for when user cannot draw the situation of key because both hands carry weight, and Consumer's Experience is bad；When user is in door, it is also possible to have the risk of maloperation.
Still an alternative is that and be placed on by the Bluetooth chip of lock body outdoors in lock body structure, by door and the physical isolation of wall so that user outdoors can receive stronger Bluetooth signal, the user in door receives more weak Bluetooth signal.And in mobile phone A PP only when Bluetooth signal has some strength, just checking identity, control enabling flow process.The problem of this mode is that application scenarios is greatly limited, the material of opposite house, and layout structure etc. all requires.Bluetooth uses the UHF radio wave signal of the ISM band of 2.4-2.485GHz to be transmitted, and in transmitting procedure, is affected the biggest by metal object.
Judging that user is in Men Nei method the most outdoors and has a problem in that RSSI is affected by environment very big based on Bluetooth signal intensity RSSI, error is the biggest.The signal that same equipment sends, the RSSI value that different mobile phones receives differs greatly；Both distances are identical, and mobile phone is placed on Bao Nei and the hand held RSSI value received differs greatly.Therefore, it is inaccurate outdoors in judging door by RSSI data.Due to the impact of environment, it is in door, it is possible to open by mistake door；It is in outdoors, it is possible to cannot open the door；It is in outdoors it is also possible to just have already turned on door apart from far.Therefore, this method does not the most solve potential safety hazard, and Consumer's Experience is the most very poor.
Summary of the invention
The invention provides and a kind of can identify that user is in Men Nei electronic lock system the most outdoors, it can overcome drawbacks described above present in prior art, easy-to-use, safe and reliable.
In order to reach this purpose, take following measures:
1, use audio signal as means outdoors in checking door.
First, the mobile device that we commonly use all has audio-frequency module, including audio frequency dispensing device and reception device, in use can not be limited.Such as smart mobile phone, smart mobile phone has speaker and microphone, and wherein microphone is exactly an apparatus for receiving audio, and speaker is an audio frequency dispensing device.
Second, when door is closed, when mobile device is as sound issue device, the intensity of sound difference that Men Nei and outdoors two audio-frequency modules receive is the biggest；When lock body is as sound issue device, the intensity of sound difference that in the door that mobile device receives and outdoors two audio-frequency modules send is the biggest.
3rd, sound is decayed comparatively fast in atmosphere, when lock body or mobile device can receive the audio signal that the other side sends, illustrate now user from door close to, make whole authentication process itself only complete in a less physical extent..
2, in order to prevent audio frequency to be copied, both sides consult the content of audio signal transmission, and comprise random number in content.This random number can be reciprocally negotiated by lock body and mobile device when bluetooth communication, can verify data at audio frequency receiving terminal.
3, it is contemplated that acoustical signal easily by external interference, characterizes 0,1 signal with different frequency sound wave, it is provided that capacity of resisting disturbance.Receiving terminal is the frequency of the audio signal that known transmitting terminal is sent out, and therefore the frequency range near these frequencies can be done Filtering Processing at receiving terminal, eliminates the impact that interference brings significantly.May be incorporated into verification and mechanism for correcting errors, fault tolerant mechanism, eliminate the impact that interference brings further.
Specifically, the technical solution used in the present invention is as follows.
A kind of electronic lock system that can identify the customer location holding authorized mobile control end, including: lock body and mobile control end.Described lock body includes the first communication module, the first audio-frequency module, the first authentication module, the first control module, and described first audio-frequency module includes first interior audio-frequency module and first audio-frequency module outdoors.The described mobile end that controls includes the second communication module, the second authentication module, the second audio-frequency module, it is characterized by:
Described first interior audio-frequency module and first audio-frequency module outdoors sends audio signal；Described second audio-frequency module receives and processes audio signal.Described first the received audio signal strength that audio-frequency module sends outdoors is better than the audio signal strength that described first interior audio-frequency module sends, and represents that the described mobile end that controls is in outdoors；
Or, described second audio-frequency module sends audio signal；Described in described first interior audio-frequency module and first, audio-frequency module receives and processes audio signal outdoors, described first audio signal strength that audio-frequency module receives outdoors is better than the audio signal strength that described first interior audio-frequency module receives, and represents that the described mobile end that controls is in outdoors.
Described second audio-frequency module has correctly received the described first audio signal that audio-frequency module sends outdoors, represents that the described mobile end that controls is in outdoors；
Described first outdoors audio-frequency module have correctly received the audio signal that described second audio-frequency module sends, represent that the described mobile end that controls is in outdoors；
Described first interior audio-frequency module and first audio-frequency module outdoors can be simultaneously emitted by audio signal, it is also possible to successively sends audio signal.
Preferably, first interior audio-frequency module and first audio-frequency module outdoors successively sends audio signal.
Described audio signal is with sound wave as information carrier, transmits 0 by the frequency of sound wave, amplitude of variation, 1 data.Before transmission, need to define how to characterize 0,1 signal, the frequency of sound wave, signal width, the data content etc. of transmission.
Further, mobile control end and lock body reciprocally negotiates the mode of audio signal transmission, and or frequency, and or content.
Further, audio signal transmission mode is to characterize 0,1 signal with different frequency sound wave；Frequency be f0, time a length of T acoustic signals represent 0, frequency be f1, time a length of T acoustic signals represent 1.The value of described f0, f1 a certain frequency values equal to 0 or in the range of frequency of sound wave, f0 and f1 is unequal.
Further, audio signal content comprises random number.
Preferably, the second communication module and the first communication module reciprocally negotiate random number before audio signal sends.
Further, audio signal content comprises error correction code data.
Further, described process audio signal includes digital filtering, and audio signal resolves, and audio signal is verified, audio signal strength obtains.
Described digital filtering, it is simply that reduce interference signal proportion in useful signal by certain calculating or determining program.Sound, in transmission, in gatherer process, is disturbed by various extraneous factors, generally individually contains various noise.After receiving audio signal, advanced row number filtering is necessary.Conventional digital filter algorithm has a lot, preferably by digital filtering algorithm based on frequency domain.
Described audio signal resolves and refers to the acoustic signals after digital filtering is reduced into data message.The mode of audio signal transmission mobile control end and lock body reciprocally negotiate, and the mobile end that controls can be by 0 according to rule, and 1 signal recovers.Preferably, audio signal resolves and carries out in a frequency domain.
The described content having correctly received audio signal refers to that the data after processing compare checking with the transferring content of negotiation, the condition meeting regulation can be judged to correctly, including but not limited to following manner: the data after process are the most correct, or first data are carried out error correction, make the data after error correction the most correct, or introducing fault-toleranr technique, when comparing, the threshold value (20bit the most altogether, 18bit therein are correct) that data accurateness reaches to set then thinks that audio signal is correct.
Described audio signal strength calculates the signal intensity referring to audio signal in door or audio signal outdoors.Described signal intensity typically describes with power.
Preferably, audio signal strength is calculated in a frequency domain.After time-domain signal transforms to frequency domain, frequency-region signal comprises frequency information, amplitude information and phase information.Wherein amplitude information i.e. can be used to describe audio signal strength.
Further, the mobile end that controls compares audio signal strength that first received audio-frequency module outdoors sends and the audio signal strength that first interior audio-frequency module sends, and has following several situation:
(1) have correctly received first interior audio-frequency module and the first audio signal that audio-frequency module sends outdoors, and the audio signal strength outdoors received is better than audio signal strength in the door received, it is determined that the user holding authorized mobile control end is in outdoors.
(2) the first audio signal that audio-frequency module sends outdoors is had correctly received, it is not properly received the audio signal that first interior audio-frequency module sends, but the audio signal strength outdoors received is better than audio signal strength in the door received, it is determined that the user holding authorized mobile control end is in outdoors.
(3) other situations, it is impossible to judge that the user holding authorized mobile control end is in outdoors.
Preferably, the mobile end that controls never receives the first audio signal that audio-frequency module sends outdoors, sets timeout mechanism, is then judged to that user is not on outdoors after time-out.
Preferably, lock body end sets the transmission cycle, sends the most complete data within a transmission cycle.
Preferably, lock body end sets sending times, resends voice data after a transmission end cycle；In the sending times exceeding setting does not the most recognize door outdoors, then it is judged to that user is not on outdoors.
Described scheme two, the mobile end that controls sends audio signal, and lock body identifies in carrying out door outdoors.
Described first interior audio-frequency module and first audio-frequency module outdoors receives the mobile audio signal controlling end transmission simultaneously.
The mode of described audio signal transmission, and or frequency, and or content refer to content described in scheme one.
Described reception also processes audio signal and refers to content described in scheme one.
Preferably, mobile control the audio signal that end sends when first interior audio-frequency module and first the most any one road of audio-frequency module outdoors is detected and demonstrated, it is possible to judge according to result, have following several situation:
(1) first interior audio-frequency module and first audio-frequency module outdoors all has correctly received audio signal, and the audio signal strength received outdoors is more than the audio signal strength received in door, it is determined that the user holding authorized mobile control end is in outdoors.
(2) first outdoors audio-frequency module have correctly received audio signal, first interior audio-frequency module is not properly received audio signal, and the audio signal strength received outdoors is more than the audio signal strength received in door, it is determined that the user holding authorized mobile control end is in outdoors.
(3) other situations, all judge that the user holding authorized mobile control end is not at outdoors.
Preferably, lock body end never receives the audio signal that the second audio-frequency module sends, and sets timeout mechanism, is then judged to that user is not on outdoors after time-out.
Preferably, the mobile end that controls sets the transmission cycle, sends the most complete data within a transmission cycle.
Preferably, the mobile end that controls sets sending times, resends voice data after a transmission end cycle；In the sending times exceeding setting does not the most recognize door outdoors, then it is judged to that user is not on outdoors.
Accompanying drawing explanation
Fig. 1 is system composition in embodiment 1；
Fig. 2 is handling process of unblanking in embodiment 1；
Fig. 3 is handling process of unblanking in embodiment 2.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the invention are described in detail.It should be noted that, technical characteristic involved in each described embodiment does not constitutes conflict each other just can be mutually combined other embodiments of composition, or, it is possible to according to circumstances delete some technical characteristic in each embodiment and constitute other embodiments.
Embodiment 1:
As it is shown in figure 1, electronic lock system includes lock body 10, mobile phone 20 that user holds and server 30.Bluetooth is passed through mutual between mobile phone 20 and lock body 10；Network interaction is passed through between mobile phone 20 and server 30.
Lock body 10 includes communication module 16, computing module 13, control module 15, memory module 11, audio-frequency module 12/14, authentication module 17, and wherein communication module 16 is the blue tooth interface on lock body circuit board；Authentication module 13, control module 15, authentication module 17 is the program run in the MCU chip on lock body circuit board；Memory module 11 is the non-volatile memory chip on circuit board；Audio-frequency module 12/14 includes in door audio-frequency module 12 and audio-frequency module 14 outdoors, respectively comprises an audio frequency dispensing device.
Mobile phone 20 includes communication module 21, computing module 22, audio-frequency module 23, authentication module 24, and wherein communication module 21 is the blue tooth interface on mobile phone, network interface；Communication module 21 carries out communication by blue tooth interface and lock, and is controlled lock, is communicated with server 30 by network interface, and network interface includes WIFI and 2G/3G/4G network interface；Computing module 22 and the part that authentication module 24 is APP program；Audio-frequency module 23 is the audio interface on mobile phone.
User and lock are mainly managed by server 30, register including user, user and the association of lock, the management etc. of the record that opens the door.
Before use, user is registered as new user on the server by mobile phone A PP, and server-assignment is to user's unique mark in systems.Mobile phone A PP is added lock；When adding lock, APP obtains the ID of lock, and by user profile, key information is written to the storage device of lock.For lock, this mobile phone is an authorized mobile control end.
Sending mode, frequency, content about audio-frequency information, both sides agree as follows:
(1) time-out time is 20S, after both sides identify in starting door outdoors, gos out outside inside door if not having in 20S to adjudicate, then exits judgement flow process.Both sides need to re-start authentication and could open the door.
(2) the lock body end audio frequency transmission cycle is 5S, and in completing door in 5S, audio-frequency module data send and audio-frequency module data transmission outdoors；Transmission times is 4 times.
(3) in door, audio-frequency module first sends out data, sends out data outdoors after audio-frequency module.For convenience of receiving terminal identification data, before valid data, first send the lead code of a byte.
(4) when data are 1, transmission frequency is the acoustic waveform of 5K, is 0 transmission DC level signal.Every 1bit data transfer width is 4ms.
(5) when authentication, both sides consult a random number, and this random number is that voice data sends content.
As shown in left in Figure 2, the flow process locking end when unblanking is as follows:
(1) on lock body, bluetooth the most externally sends broadcast singal, and when user is near lock body, mobile phone A PP can detect Bluetooth signal, and both sides set up connection.
(2) mobile phone A PP and lock are by bluetooth communication, carry out authentication；Both sides consult the content that a random number sends as audio frequency.
(3) lock end by buzzer by random number with audio signal by the way of send.
(4) Men Nei and complete after voice data sends, lock end detects whether to receive the door open command that APP sends, if receiving door open command, then jumps to step (6).
(5) without receive APP send door open command, detect whether time-out or reach transmission times, if time-out or reach transmission times, then jump to step (7)；Otherwise, then step (3) is repeated.
(6) control to open door lock by control module.
(7) remove authentication and pass through state, exit enabling flow process.
As shown in right in Figure 2, when unblanking, the flow process of mobile phone terminal is as follows:
(1) mobile phone A PP search Bluetooth signal, and lock end bluetooth is set up and is connected.
(2) mobile phone A PP passes through bluetooth communication, carries out authentication；Both sides consult the content that a random number sends as audio frequency.
(3) mobile phone A PP receives acoustical signal by the Mike on mobile phone.
(4) if identified outdoors in completing door, then jump to step (6), otherwise, jump to step (5).
(5) time-out is detected whether, if it times out, jump to step (8)；Otherwise, then step (3) is repeated.
(6) recognition result outdoors in detection door, is in outdoors if ruling out user, then jumps to step (7)；Otherwise, then step (8) is jumped to.
(7) door open command is sent to lock end.
(8) state whether display door lock is opened, exits enabling flow process.
Embodiment 2:
In the present embodiment, mobile phone A PP sends audio signal, and lock body receives audio signal, and the audio-frequency module in lock body 10 is 2 audio frequency receiver modules, and in recognitiion gate, flow process outdoors realizes in lock body.
As shown in left in Figure 3, the flow process locking end when unblanking is as follows:
(1) on lock body, bluetooth the most externally sends broadcast singal, and when user is near lock body, mobile phone A PP can detect Bluetooth signal, and set up connection；
(2) lock and mobile phone A PP are by bluetooth communication, carry out authentication；After authentication is passed through, it is that authentication is passed through that lock body arranges state.
(3) lock receives acoustical signal by the door on lock body and outdoors 2 pick ups simultaneously.
(4) if identified outdoors in completing door, step (6) is jumped to；Otherwise jump to step (5).
(5) if not timed out, then repeat step (3)；Otherwise jump to step (8).
(6) if ruling out user and being in outdoors, then step (7) is jumped to；Otherwise jump to step (8).
(7) controlling to open door lock by control module, notice APP door lock is the most successfully opened.
(8) remove authentication and pass through state, exit enabling flow process.
As shown in right in Figure 3, when unblanking, the flow process of mobile phone terminal is as follows:
(1) mobile phone A PP search Bluetooth signal, and lock end bluetooth is set up and is connected.
(2) mobile phone A PP passes through bluetooth communication, carries out authentication；Both sides consult the content that a random number sends as audio frequency.
(3) mobile phone A PP sends audio signal by the speaker on mobile phone.
(4) mobile phone A PP completes after voice data sends, to monitor and whether receive the information that the door lock that lock body sends successfully is opened, if received, then jumping to step (6).
(5) detect whether time-out or reach transmission times, if time-out or reach transmission times, then jump to step (6), otherwise, then repeat step (3).
(6) state whether display door lock is opened, exits enabling flow process.
Embodiment 3:
On the basis of above-described embodiment, in the audio information content of transmission, adding lead code before random number, wherein, in door, audio-frequency module lead code is 16 system number 0xA5.Audio-frequency module lead code is 16 system number 0xA4 outdoors.
At audio frequency receiving terminal end, when lead code being detected, next random number just can be parsed.
Embodiment 4:
On the basis of above-described embodiment, in the audio information content of transmission, after random number, add Hamming code.
At mobile phone terminal, after parsing random number and Hamming code, first data being carried out error correction, the data after error correction compare with the data consulted again, can strengthen capacity of resisting disturbance.
Embodiment 5:
On the basis of above-described embodiment, during data check, the threshold value (20bit the most altogether, 18bit therein are correct) that data accurateness reaches to set then thinks that audio signal is correct.
Although the embodiment that disclosed herein is as above, but described content is only to facilitate the embodiment that understands the present invention and use, is not limited to the present invention.Technical staff in any the technical field of the invention, on the premise of without departing from the spirit and scope that disclosed herein, in form and can make any amendment and change in details implement, but should fall in the protection domain of the application.
Claims (12)
1. can identify an electronic lock system for the customer location holding authorized mobile control end, including: lock body and mobile control end；Described lock body includes the first communication module, the first audio-frequency module, the first authentication module, the first control module, and described first audio-frequency module includes first interior audio-frequency module and first audio-frequency module outdoors；The described mobile end that controls includes the second communication module, the second authentication module, the second audio-frequency module, it is characterized by:
Described first interior audio-frequency module and first audio-frequency module outdoors sends audio signal；Described second audio-frequency module receives and processes audio signal, and described first the received audio signal strength that audio-frequency module sends outdoors is better than the audio signal strength that described first interior audio-frequency module sends, and represents that the described mobile end that controls is in outdoors.
2. can identify an electronic lock system for the customer location holding authorized mobile control end, including: lock body and mobile control end；Described lock body includes the first communication module, the first audio-frequency module, the first authentication module, the first control module, and described first audio-frequency module includes first interior audio-frequency module and first audio-frequency module outdoors；The described mobile end that controls includes the second communication module, the second authentication module, the second audio-frequency module, it is characterized by:
Described second audio-frequency module sends audio signal；Described in described first interior audio-frequency module and first, audio-frequency module receives and processes audio signal outdoors, described first audio signal strength that audio-frequency module receives outdoors is better than the audio signal strength that described first interior audio-frequency module receives, and represents that the described mobile end that controls is in outdoors.
Electronic lock system the most according to claim 1, is characterized in that: described second audio-frequency module has correctly received the content of the described first audio signal that audio-frequency module sends outdoors.
Electronic lock system the most according to claim 2, is characterized in that: described first outdoors audio-frequency module have correctly received the content of the audio signal that described second audio-frequency module sends.
5., according to the electronic lock system described in any one of claim 1-4, it is characterized in that described mobile control end and described lock body reciprocally negotiate the mode of audio signal transmission, frequency and/or content.
6., according to the electronic lock system described in any one of claim 1-5, it is characterized in that described process audio signal includes that digital filtering, audio signal resolve, audio signal verifies and audio signal strength calculates.
7., according to the electronic lock system described in any one of claim 1-6, it is characterized in that described process audio signal is to process in a frequency domain.
8., according to the electronic lock system described in any one of claim 1-7, it is characterized in that described audio signal transmission mode refers to the signal by different frequency sound wave sign 0 or 1；Frequency be f0, time a length of T acoustic signals represent 0, frequency be f1, time a length of T acoustic signals represent 1, the value of described f0, f1 equal to 0 or frequency of sound wave in the range of a certain frequency values, f0 and f1 is unequal.
9., according to the electronic lock system described in any one of claim 1-8, it is characterized in that described audio signal content comprises random number and/or error correction code data.
10., according to the electronic lock system described in any one of claim 1-9, it is characterized in that described process audio signal includes verifying voice data and error correction.
11. according to the electronic lock system described in any one of claim 1-10, it is characterized in that the checking of described audio signal introduces fault-toleranr technique, and the content that the signal parsed is consulted with both sides compares, and data consistency reaches threshold value and then thinks and be verified.
The method of the customer location of authorized mobile control end is held in the identification of 12. 1 kinds of electronic locks, it is characterised in that use the electronic lock system as described in any one of claim 1-11.
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| CN201610577149.5A CN106023388A (en) | 2016-07-21 | 2016-07-21 | Electronic lock system capable of identifying location of user with authorized mobile control end and method implemented by electronic lock system |
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| CN201610577149.5A CN106023388A (en) | 2016-07-21 | 2016-07-21 | Electronic lock system capable of identifying location of user with authorized mobile control end and method implemented by electronic lock system |
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| CN109466507A (en) * | 2018-12-06 | 2019-03-15 | 上海博泰悦臻电子设备制造有限公司 | Car door lock state synchronization method based on mobile phone screen, server, synchronization system |
| CN109840980A (en) * | 2019-04-04 | 2019-06-04 | 兰溪铂蓝智能科技有限公司 | A kind of bluetooth locks auto-unlocking method automatically |
| WO2023028750A1 (en) * | 2021-08-30 | 2023-03-09 | Versitech Limited | An apparatus for detecting entry and exit by crossing a virtual line |
| WO2023072207A1 (en) * | 2021-10-30 | 2023-05-04 | 华为技术有限公司 | Position acquisition method and related device |
| CN114550358A (en) * | 2021-12-28 | 2022-05-27 | 广东飞企互联科技股份有限公司 | Industry park management system and method based on big data |
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