A police equipment cabinet based on passive RFID technology

Abstract

The invention discloses a police equipment cabinet based on passive RFID technology, which comprises a cabinet body and a main control management system. The cabinet body is provided with a plurality of unit cabinets, each of which is provided with a circularly polarized antenna. The circularly polarized antenna in each unit cabinet comprises a pair of circularly polarized UHF antennas forming an antenna signal environment of upward and downward irradiation, and the pair of circularly polarized UHF antennas are respectively arranged at the top of the unit cabinet and the bottom of the unit cabinet. The main control management system comprises a main control center, a unit control center and a power supply device. The main control center comprises a main control processor and a human-computer interaction system, the unit control center comprises an embedded mainboard and underlying hardware, and the power supply device adopts a distribution box. The police equipment cabinet of the invention effectively solves the problems of missed reading and cross-reading of labels between cabinets, and poor face recognition effect.

Description

Technical Field

[0001] The invention belongs to the technical field of RFID radio frequency identification, in particular to a police equipment cabinet based on RFID technology or passive RFID technology. Background Art

[0002] In recent years, with the continuous construction of modern police support models, the full life cycle management mechanism of police equipment has been continuously improved. As the key manifestation of the combat effectiveness of public security organs, the management of police equipment is of special importance in police work.

[0003] Police equipment is mainly used to store single police equipment, which mainly includes: police telescopic batons, metal handcuffs, multifunctional belts, tear gas sprayers, single police law enforcement recorders, walkie-talkies, strong light flashlights, etc. The service targets are the police security departments of public security organs. The problem to be solved is the contradiction between the diversity, dispersion, and large quantity of police equipment and the centralized, systematic, and specialized requirements of equipment management. The equipment of departments at all levels of public security organs is constantly improving and accumulating. The demand for the storage, allocation, dedicated management, scrap management, timely maintenance, and statistical analysis of police equipment has increased significantly, and the demand for information management of equipment is becoming more and more urgent.

[0004] The police equipment cabinet using passive RFID technology can be used as a technical solution for the intelligent management of police equipment, realizing intelligent management such as storage, tracking, monitoring, query, automatic inventory, scrapping reminder, statistical analysis, maintenance, batch transfer, co-construction and sharing of equipment information, forming a new digital and automated management model in which police equipment at all levels and in all places can be tracked, accurately queried and transferred in real time.

[0005] For example, in the prior art, the Chinese patent publication number is CN208988099U, and the patent document "Police Equipment Cabinet" uses RFID technology to realize the dynamic resource configuration of police equipment, real-time status perception, self-service collection and return, and efficient reshaping of application processes, mobile application guidance, controllable storage environment, and automated maintenance to ensure equipment availability, clear division of responsibilities, and effective supervision and intervention throughout the process, providing detailed equipment information support for external information systems such as command and dispatch. However, in actual use, the above-mentioned police equipment cabinet uses RFID tags to bind different equipment, and when the RFID reader is used to read and identify the equipment, when there is a lot of overlap in the equipment in the cabinet, it will cause the equipment to be missed; and when the RFID signal leaks, it will cause the RFID tags between the cabinets to be read in series. Furthermore, if the RFID signal leaks from the inside of the cabinet door to the outside, it will also misread the label outside the door. In addition, the above-mentioned police equipment cabinet uses a camera for face recognition and identity verification, but in actual use, there will be a halo on the image recognized by the camera, which will make face recognition difficult, leading to repeated recognition and even misidentification, which will affect the division of responsibility. The above are all problems existing in the existing technology. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a police equipment cabinet based on passive RFID technology, which effectively solves the problem of missed reading of labels between cabinet compartments.

[0007] Further invention purpose: The police equipment based on passive RFID technology of the present invention also solves the problem of tag cross-reading between cabinets caused by RFID signal leakage.

[0008] Further invention purpose: The police equipment based on passive RFID technology of the present invention also solves the problem that when the camera shoots a face, the image has a halo and the face recognition effect is poor.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a police equipment cabinet based on passive RFID technology, including a cabinet body and a main control management system, wherein a plurality of unit cabinets are arranged on the cabinet body, and a circularly polarized antenna is arranged in each unit cabinet, characterized in that: the circularly polarized antenna in each unit cabinet comprises a pair of circularly polarized UHF antennas forming an antenna signal environment of upward and downward irradiation, and the pair of circularly polarized UHF antennas are respectively arranged at the top of the unit cabinet and the bottom of the unit cabinet;

[0010] The main control management system includes a main control center, a unit control center and a power supply device. The main control center includes a main control processor and a human-computer interaction system. The unit control center includes an embedded mainboard and underlying hardware. The power supply device uses a distribution box.

[0011] The main control processor is used to connect with the embedded mainboard to complete the data interaction function; and is used to connect with the human-computer interaction system to complete the human-computer interaction function;

[0012] The human-computer interaction system includes a binocular camera module, a fingerprint module, a capacitive touch screen, and a voice reminder unit;

[0013] Binocular camera module, used to capture images of logged-in personnel and upload them to the main control processor;

[0014] Fingerprint module, used to input the operator's fingerprint and upload it to the main control processor;

[0015] Capacitive touch screen, used to display the human-computer interaction menu page, display the access results, and allow the logged-in personnel to perform human-computer interaction operations;

[0016] Voice reminder unit, used to announce the storage and retrieval results of the unit cabinet;

[0017] The embedded mainboard is used to directly interact with the underlying hardware and provide feedback to the main control processor. The underlying hardware includes an RFID reader / writer, a lock control unit, and a light control unit. The embedded mainboard is connected to the circularly polarized antenna through an antenna splitter.

[0018] The RFID reader is connected to the circularly polarized antenna through an antenna splitter and is used to read or write equipment data in the equipment cabinet. The equipment data includes access records, traceability records, and real-time positioning of the equipment in the unit cabinet;

[0019] Lock control unit, used for opening and closing the unit cabinet;

[0020] Light control unit; used in unit cabinets for lighting and / or disinfection;

[0021] The distribution box is used to provide power support for the normal operation of the police equipment cabinet.

[0022] Furthermore, the circularly polarized antenna in the unit cabinet is connected to the antenna splitter through a feeder, and the unit cabinet is provided with a through hole for the feeder to pass through. The feeder is connected to the antenna splitter after passing through the through hole, and the antenna splitter is connected to the RFID reader / writer. An upper guard edge and a lower guard edge are respectively provided above and below the through hole, and a concave cavity is formed between the upper guard edge and the lower guard edge for inserting one side of the circularly polarized antenna.

[0023] Furthermore, a shielding strip is attached to the inner side of the cabinet door of the unit cabinet.

[0024] Furthermore, a glass plate is embedded in the cabinet door of the unit cabinet, and a shielding coating is coated on the glass plate.

[0025] Furthermore, the unit cabinet is separated into at least two small compartments by acrylic plates.

[0026] Furthermore, the binocular camera module includes a transparent acrylic plate and a mounting plate, left and right cameras are embedded on the mounting plate, flash lights are installed on the left side of the left camera and the right side of the right camera, the transparent acrylic plate is fixedly mounted on the cabinet, and a black soft plastic partition is provided between the transparent acrylic plate and the mounting plate, the black soft plastic partition is provided with camera holes for the left and right cameras to pass through, and the flash lights are exposed outside the black soft plastic partition.

[0027] Furthermore, three flashes are installed on the left side of the left camera, and three flashes are also installed on the right side of the right camera.

[0028] Furthermore, the cabinet includes unit compartments and a maintenance slot, the unit compartments are distributed on the left and right sides of the cabinet, the maintenance slot is located in the middle area of ​​the cabinet, and the RFID tag reader and embedded motherboard are installed in the compartment.

[0029] Furthermore, the cabinet body includes a main cabinet and a sub-cabinet. The main cabinet is provided with a main control center, a unit control center and a power supply device, and the sub-cabinet is only provided with a unit control center and a power supply device. Ethernet communication is adopted between the main cabinet and the sub-cabinet. A unit cabinet grid on the main cabinet constitutes a main cabinet equipment cabinet. The main control processor, capacitive touch screen, binocular camera module, fingerprint module and voice reminder unit are all installed on the cabinet door of the main cabinet equipment cabinet.

[0030] Furthermore, the method for locating the label position in the police equipment cabinet comprises the following steps: ① Each unit cabinet is numbered in sequence and the numbered unit cabinet is called a spatial point, and the circularly polarized antennas distributed in each unit cabinet are also numbered. There are two circularly polarized UHF antennas in a unit cabinet, which are respectively distributed on the top and bottom of the unit cabinet; therefore, a unit cabinet is a spatial point. x, corresponding to 2 circularly polarized antennas numbered Ant1 and Ant2; ② When the RFID tag reader receives a command from the main control processor to locate the item tag issued by the user through the capacitive touch screen or an automatic calibration command from the main control processor after power is restored, the RFID reader traverses each circularly polarized antenna inventory tag on the circularly polarized antenna through the antenna splitter, obtains the RSSI signal value of each label in the cabinet when it is counted, the number of times each label is counted by each circularly polarized antenna per unit time, and the antenna number of the read label, and inputs it into the embedded mainboard; ③ The embedded mainboard forms a three-dimensional spatial model of the antenna array according to the spatial point positions of each circularly polarized antenna, in which the antennas are distributed in the spatial point positions in units of antenna feed points, and the circularly polarized antenna The closer the spatial point is to the center of the three-dimensional space model, the better its position is. ④ The embedded mainboard also forms a tag data information table for each tag based on the RSSI signal value each time the tag is counted, the number of times each tag is counted by each circularly polarized antenna per unit time, and the antenna number of the tag being read, and after sorting and calculating according to the strengths of the RSSI signal values ​​in the tag data information table, an RSSI sorting table of the tag data information table is obtained; ⑤ The embedded mainboard uses the RSSI sorting table of the tag data information table and the advantages and disadvantages of the spatial point of the antenna number counted to the tag in the three-dimensional space model of the antenna array to integrate and process, output the optimal antenna spatial point as the positioning position of the tag, transmit it to the main control processor, and display it on the capacitive touch screen.

[0031] By adopting the above scheme, the present invention can perform information entry, source tracing, access record query, and real-time location query on police equipment through RFID electronic tags. Multiple sub-cabinets can be extended between the main cabinet and the sub-cabinet through the network interface to form a multi-cabinet cascade structure, and the isolation performance between each cabinet is excellent. The glass door on the cabinet is processed with signal shielding materials, and a shielding strip is also provided inside the cabinet door, so there is no misreading of the equipment outside the cabinet door; the feeder through hole of the circular polarization antenna in the cabinet is sealed with upper and lower retaining structures to prevent signal leakage and cause cross-reading between unit cabinets; the circular polarization circular polarization antenna in each unit cabinet is arranged in an upper and lower opposing structure, so that the antenna signal in the unit cabinet is evenly distributed, which can completely cover the space range of the entire cabinet, ensuring no dead angle and avoiding missed reading. At the same time, a variety of customized labels can be used to achieve optimal reading for different types of police equipment, such as flexible anti-metal labels suitable for police daggers, lighting lamps, etc., button-type anti-metal labels suitable for equipment such as arrest nets, PCB anti-metal labels suitable for equipment such as handcuffs, and dual-polarization labels suitable for emergency kits, etc.; the present invention adopts a binocular camera authentication method, which can quickly realize the authority management of police officers, realize the use of dedicated counters, and capture face pictures as login records and save them in the system, which greatly realizes the security management of police equipment. The administrator adopts a dual authentication method of face recognition combined with fingerprint authentication to realize the authority management of the system. As a management device for police equipment, the present invention can be connected to the public security intranet and docked to the dispatch center platform. Each public security agency can realize the allocation and borrowing management of police equipment, and comprehensively improve the combat effectiveness of the overall operation.

[0032] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Attached Figure 1 It is a structural block diagram of a specific embodiment of the present invention;

[0034] Attached Figure 2 This is a schematic diagram of the cascade structure of the main cabinet and the auxiliary cabinet in a specific embodiment of the present invention;

[0035] Attached Figure 3 This is a schematic diagram of the internal structure of the main cabinet unit cabinet of a specific embodiment of the present invention;

[0036] Attached Figure 4 A perspective view of the installation structure of the antenna array, the wire holes, and the upper and lower ribs according to a specific embodiment of the present invention;

[0037] Attached Figure 5 This is a schematic diagram of the side structure of a binocular camera module according to a specific embodiment of the present invention;

[0038] Attached Figure 6 This is another structural schematic diagram of a binocular camera module according to a specific embodiment of the present invention;

[0039] Binocular camera module 1, transparent acrylic plate 11, mounting plate 12, left camera 13, right camera 14, black soft plastic partition 16, fingerprint module 2, voice reminder unit 3, capacitive touch screen 4, main cabinet 51, sub-cabinet 52, unit cabinet 53, acrylic plate 532, small grid 531, maintenance slot 54, main cabinet equipment cabinet 511, through hole 55, upper rib 561, lower rib 562, cabinet door 57, glass plate 571, circularly polarized antenna 58. DETAILED DESCRIPTION

[0040] The specific implementation example of the present invention is Figure 1-6 The figure shows a police equipment cabinet based on passive RFID technology, which includes a cabinet body and a main control management system; the main control management system includes a main control center, a unit control center and a power supply device, the main control center includes a main control processor and a human-computer interaction system, the unit control center includes an embedded motherboard and underlying hardware, and the power supply device uses a distribution box.

[0041] In this embodiment, the main control processor adopts RK3288E of Rockchip Company and runs Android7.1 system. The human-computer interaction system includes binocular camera module 1, fingerprint module 2, capacitive touch screen 4, and voice reminder unit 3; the main control processor is connected to the binocular camera module 1, and when the login personnel log in or use the police equipment cabinet, the login personnel's impact is captured to perform face recognition to determine whether the login personnel or user meets the operation authority, thereby realizing authority allocation, and the authority can be specific to the unit cabinet 53, that is, one person per unit cabinet 53 responsibility system; specifically, Figure 5-6 As shown, the binocular camera module 1 includes a transparent acrylic plate 11 and a mounting plate 12, a left camera 13 and a right camera 14 are embedded in the mounting plate 12, a row of flashlights are installed on the left side of the left camera 13 and the right side of the right camera 14, the transparent acrylic plate 11 is fixedly mounted on the cabinet, and a black soft plastic interlayer 16 is also provided between the transparent acrylic plate 11 and the mounting plate 12, and a camera hole for the left and right cameras 14 to pass through is left on the black soft plastic interlayer 16, and the flashlight is exposed outside the black soft plastic interlayer 16 and is not blocked by the black plastic interlayer. Through the design of the above sandwich structure, the binocular camera module 1 has a clear effect and clear recognition when capturing portraits. Another way of identity recognition is to identify the identity of the operator and clarify his / her authority through the fingerprint module 2, i.e., the fingerprint sensor; face recognition and fingerprint recognition can be verified simultaneously or used alone according to needs; when the identity authentication is passed, the operator can operate on the capacitive touch screen 4. After the operation is completed, the access result of the equipment is announced through the voice reminder unit 3, and the access information is displayed on the capacitive touch screen 4 at the same time.

[0042] The embedded mainboard is used to interact directly with the underlying hardware and feed back to the main control processor. The underlying hardware includes an RFID reader (or reader), a lock control unit, and a light control unit. The embedded mainboard is connected to the circularly polarized antenna 58 through an antenna splitter; the RFID reader is connected to the circularly polarized antenna 58 through an antenna splitter to read or write equipment data in the equipment cabinet. The RFID reader is connected to the embedded mainboard and feeds back the read equipment data to the embedded mainboard. The equipment data includes access records, traceability records, real-time positioning positions, etc. of the equipment in the unit cabinet 53; in this embodiment, the embedded mainboard uses TI's AM335x industrial-grade chips, such as AM3352, AM3353, etc., which have strong processing capabilities and are stable and reliable. The RFID reader is a UHFRFID reader, which uses the R2000 series high-end RFID module independently developed by our company, with a frequency band of 840~960MHz, which has the characteristics of high multi-tag reading and recognition rate and strong processing capabilities.

[0043] The lock control unit includes an electronic door lock and an emergency mechanical door lock. The electronic door lock is used to open and close the unit cabinet 53, and the emergency mechanical door lock can be used to open the unit cabinet 53 when the electronic door lock fails or in an emergency.

[0044] The above-mentioned light control unit includes a lighting lamp and a disinfection lamp, and each unit cabinet 53 is equipped with a lighting lamp and a disinfection lamp. As the name implies, the lighting lamp is used for lighting, while the disinfection lamp is used to disinfect the equipment placed in the unit cabinet 53.

[0045] In addition, the police equipment cabinet is also equipped with a distribution box to provide power support for the normal operation of the police equipment cabinet.

[0046] Specifically, the cabinet includes a main cabinet 51 and a sub-cabinet 52. The main cabinet 51 is provided with a main control center, a unit control center and a power supply device, and the sub-cabinet 52 is only provided with a unit control center and a power supply device. Ethernet communication is adopted between the main cabinet 51 and the sub-cabinet 52, and the sub-cabinet 52 is controlled by the main cabinet 51. The main cabinet 51 and the sub-cabinet 52 are both provided with unit cabinets 53, and the unit cabinets 53 are arranged on the left and right sides and distributed from top to bottom. In this embodiment, four unit cabinets 53 are provided on one cabinet, and a longitudinal maintenance slot 54 is left between the left and right columns of unit cabinets 53. The embedded motherboard and the underlying hardware such as the RFID reader are installed in the maintenance slot 54. The equipment can be repaired by opening the maintenance slot 54 with a key. The left unit cabinet 53 on the main cabinet 51 constitutes the main cabinet equipment cabinet 511, and the main control processor of the main control center, the capacitive touch screen 4, the binocular camera module 1, the fingerprint module 2, and the voice reminder unit 3 are all installed on the cabinet door 57 of the main cabinet equipment cabinet 511.

[0047] In the above-mentioned unit cabinet 53, it is divided into three small grids 531 from top to bottom, and the small grids 531 are separated from each other by acrylic plates 532, so that the equipment placed in the unit cabinet 53 can be roughly classified and stored. In the actual use process, in order to avoid equipment overlap and equipment miss, it is necessary to form an environment in which the antenna field strength is evenly distributed and the range is controllable in the unit cabinet 53. The circularly polarized antenna 58 used in this embodiment includes a pair of circularly polarized UHF antennas, which are respectively arranged at the top of the unit cabinet 53 and the bottom of the unit cabinet 53, and are sealed by acrylic plates, forming an antenna signal environment of up and down irradiation in the unit cabinet 53. Furthermore, in this embodiment, the diameter size of the circularly polarized UHF antenna is designed to be 1 / 2 of the length of the side length of the unit cabinet 53. This method makes the field strength evenly distributed and the range controllable in each unit cabinet 53 space, and the actual use performance requirements can be achieved only by setting the power. The three small grids 531 in the middle of each large grid are separated by acrylic plates 532. The acrylic plates 532 have good signal penetration to avoid missed readings caused by signal shielding. A charging device can also be set in the middle small grid 531. The charging device can provide 8-way USB and 1-way 220V charging and support power-off protection.

[0048] The circular polarization antenna 58 in the above-mentioned unit cabinet 53 is connected to the antenna splitter through a feeder. The circular polarization antenna 58 is installed on the metal layer plate on the bottom or top of the unit cabinet, and then fixed on the other side of the circular polarization antenna through an acrylic plate. The antenna signal can pass through the acrylic plate, and the antenna signal in the unit cabinet 53 will not be weakened. The unit cabinet 53 is provided with a through hole 55 for the feeder to pass through. After passing through the through hole 55, the feeder is connected to the antenna splitter, and the antenna splitter is connected to the RFID reader. An upper rib 561 and a lower rib 562 are respectively provided above and below the through hole 55. A side wall is also connected between the upper rib 561 and the lower rib 562. A concave cavity into which one side of the acrylic plate can be inserted is formed between the upper rib 561 and the lower rib 562. After passing through the through hole 55, the feeder enters the maintenance slot 54 through the back of the side wall and is connected to the antenna splitter. The upper retaining edge 561, the lower retaining edge 562 and the side wall can be made of metal shielding material to prevent the leakage of feeder signals and cause cross-reading between two or more adjacent unit cabinets 53; a shielding strip is attached to the inner side of the cabinet door of the unit cabinet 53 to prevent the signal from leaking out from the gap of the cabinet door 57 of the unit cabinet 53 and misreading the label outside the cabinet door 57. In addition, a glass plate 571 is embedded in the cabinet door of the unit cabinet 53, so that the police can directly see the equipment or documents in the cabinet. In order to prevent the signal from leaking from the glass plate 571, a shielding coating is also coated on the glass plate 571. In addition, a shielding strip is also provided on the inner side of the cabinet door 57 of the unit cabinet 53 to prevent signal leakage.

[0049] The working principle of the police equipment cabinet of the present invention is as follows: the police officer performs face recognition authentication through the binocular camera module 111, and can only operate on the capacitive touch display screen after the authentication is successful. After entering the main menu of the human-computer interaction page APP, operations such as equipment query, equipment access history search, door opening, equipment access, etc. can be performed. When you need to access equipment, you need to click the corresponding unit cabinet 53 on the capacitive touch display screen to open the cabinet door 57. After the main control processor receives the operation instruction, it sends it to the embedded mainboard to control the electronic door lock to open. After the cabinet door 57 is opened, the lighting lamp in the unit cabinet 53 is lit, the police officer performs equipment access operation, and then closes the door. When the embedded mainboard detects the door closed state, it first controls the ultraviolet disinfection lamp to light up, and at the same time controls the RFID reader and circular polarization antenna 58 to complete the tag data inventory and calculation, and outputs the equipment access change information to the main control processor. The main control processor plays the prompt voice through the voice reminder unit 311 to obtain the access result, and displays the access information on the capacitive touch display screen. After the operation is completed, the police officer can exit to the home page by operating the touch screen, or automatically return to the login page after the page times out. When the cabinet door 57 is opened for a long time, the voice playback unit 11 will issue an early warning. The police officer can also query the equipment information data in the equipment at any time through the human-computer interaction system.

[0050] The present invention can also have the function of automatic data calibration. When an emergency alarm is issued during a power outage, equipment access is performed through an emergency mechanical button. After power is restored, the system can automatically complete the inventory and positioning calculation of the entire cabinet data, save the records and push information to the main control processor.

[0051] The specific positioning method of the police equipment cabinet is as follows: each unit cabinet 53 is numbered in sequence and the numbered unit cabinet 53 is called a spatial point. At the same time, the circularly polarized antenna 58 distributed in each unit cabinet 53 is also numbered. There are two circularly polarized UHF antennas in a unit cabinet 53, which are respectively distributed on the top and bottom of the unit cabinet 53; therefore, a unit cabinet 53 is a spatial point. x , corresponding to two circularly polarized antennas 58 numbered Ant1 and Ant2.

[0052] When the RFID tag reader receives a command from the main control processor to locate the item tag issued by the user through the capacitive touch screen operation or an automatic calibration command from the main control processor after power is restored, the RFID reader traverses each circular polarization antenna 58 on the circular polarization antenna 58 through the antenna splitter to count the tags, obtains the RSSI signal value when the tags in the cabinet are counted each time, the number of times each tag is counted by each circular polarization antenna 58 per unit time, and the antenna number of the read tag, and inputs them into the embedded mainboard;

[0053] The embedded mainboard forms a three-dimensional space model of the antenna array according to the spatial point positions of each circularly polarized antenna 58, wherein the antennas are distributed in the spatial point positions with antenna feed points as units, and the closer the spatial point position of the circularly polarized antenna 58 is to the center of the three-dimensional space model, the better its position;

[0054] The embedded mainboard also forms a tag data information table for each tag based on the RSSI signal value each time the tag is counted, the number of times each tag is counted by each circular polarization antenna 58 per unit time, and the antenna number of the tag, and obtains an RSSI sorting table of the tag data information table after sorting and calculating according to the strength of the RSSI signal value in the tag data information table;

[0055] The embedded mainboard integrates the RSSI sorting table of the tag data information table and the advantages and disadvantages of the spatial point position of the tag's antenna number in the three-dimensional space model of the antenna array, and then outputs the optimal antenna spatial point as the positioning position of the tag, transmits it to the main control processor and displays it on the capacitive touch screen.

[0056] When taking inventory of the entire cabinet, all circularly polarized antennas 58 need to be polled, which is time-consuming. When a certain compartment of a police equipment cabinet with multiple unit compartments 53 is opened separately, only the upper and lower circularly polarized antennas 58 corresponding to the compartment can be triggered for inventory, so that the time period can be relatively short. When a single antenna is triggered to read a tag, if the number of tags increases or decreases, it is only necessary to design a positioning logic algorithm based on the tag information read by the single antenna and the data information library of the original antenna array to obtain the increase or decrease of the tag. Specific description:

[0057] (1) The antenna numbers in the antenna array are distributed as Ant1, Ant2, Ant3, ... Antn

[0058] (2) The label data in the antenna array database is defined as:

[0059] Ant1 antenna data: Ant1-Tag1, Ant1- Tag2,... Ant1- Tag m1

[0060] Ant2 antenna data: Ant2- Tag1, Ant2- Tag2,... Ant2- Tag m2...

[0061] Antn antenna number data: Antn- Tag1, Antn- Tag2,... Antn- Tag mn

[0062] (3) During a cycle of reading tag data, an antenna Antx in the antenna array reads w tag data, named R1, R2, ..., Rw.

[0063] The first step is to determine whether Ri is in the Antx information library (Antx- Tag1, Antx- Tag2,... Antx-Tag m1 ):

[0064] If Ri is in the Antx repository, Ri=>status is unchanged;

[0065] If Ri is not in the Antx information library, check whether Ri is in all antenna array databases (Ant1-Antn). If it is in the database, it means that Ri is a tag in other antennas read in series, and Ri=>the status is unchanged; if Ri is not in the entire database, Ri=>is added;

[0066] Polling starts from R1 and ends at Rw.

[0067] The second step is to extract the tag data in the original database of Antx, and record it as: Antx- Tag1, Antx-Tag2, Antx- Tag k,..., Antx- Tag mx;

[0068] Search Antx- Tag1, Antx- Tag2,..., Antx- Tag in R1-R30 in turn k,..., Antx-Tag mx ,

[0069] If you can find Antx- Tag in R1~R30 k , then Antx- Tag k =>The state has not changed;

[0070] If you cannot find Antx- Tag in R1~R30 k , then Antx- Tag k =>Take out;

[0071] Through the above comparative analysis, it can be concluded that after a single antenna reads the tag, it can accurately locate the newly added and reduced tags.

[0072] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art may adopt other various specific implementation modes to implement the present invention based on the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A police equipment cabinet based on passive RFID technology, including a cabinet body and a main control management system, wherein the cabinet body is provided with a plurality of unit cabinets, each unit cabinet is provided with a circularly polarized antenna, and the characteristics are: The circularly polarized antenna in each unit cabinet includes a pair of circularly polarized UHF antennas that form an antenna signal environment that is radiated upward and downward, and the pair of circularly polarized UHF antennas are respectively arranged at the top of the unit cabinet and the bottom of the unit cabinet; The main control management system includes a main control center, a unit control center and a power supply device. The main control center includes a main control processor and a human-computer interaction system. The unit control center includes an embedded mainboard and underlying hardware. The power supply device uses a distribution box. The main control processor is used to connect with the embedded mainboard to complete the data interaction function; and is used to connect with the human-computer interaction system to complete the human-computer interaction function; The human-computer interaction system includes a binocular camera module, a fingerprint module, a capacitive touch screen, and a voice reminder unit; Binocular camera module, used to capture images of logged-in personnel and upload them to the main control processor; Fingerprint module, used to input the operator's fingerprint and upload it to the main control processor; Capacitive touch screen, used to display the human-computer interaction menu page, display the access results, and allow the logged-in personnel to perform human-computer interaction operations; Voice reminder unit, used to announce the storage and retrieval results of the unit cabinet; The embedded mainboard is used to directly interact with the underlying hardware and provide feedback to the main control processor. The underlying hardware includes an RFID reader / writer, a lock control unit, and a light control unit. The embedded mainboard is connected to the circular polarization antenna through an antenna splitter; The RFID reader is connected to the circularly polarized antenna through an antenna splitter and is used to read or write equipment data in the equipment cabinet. The equipment data includes access records, traceability records, and real-time positioning of the equipment in the unit cabinet; Lock control unit, used for opening and closing the unit cabinet; Light control unit, used for lighting and / or disinfection in unit cabinets; The distribution box is used to provide power support for the normal operation of the police equipment cabinet.

2. The police equipment cabinet based on passive RFID technology according to claim 1 is characterized in that: The circularly polarized antenna in the unit cabinet is connected to the antenna splitter through a feeder. The unit cabinet is provided with a through hole for the feeder to pass through. The feeder is connected to the antenna splitter after passing through the through hole. The antenna splitter is connected to the RFID reader. An upper rib and a lower rib are respectively arranged above and below the through hole. A concave cavity is formed between the upper rib and the lower rib for inserting one side of the circularly polarized antenna.

3. The police equipment cabinet based on passive RFID technology according to claim 1 or 2, characterized in that: A shielding strip is attached to the inner side of the cabinet door of the unit cabinet.

4. The police equipment cabinet based on passive RFID technology according to claim 3 is characterized in that: A glass plate is embedded on the cabinet door of the unit cabinet, and a shielding coating is coated on the glass plate.

5. The police equipment cabinet based on passive RFID technology according to claim 1 is characterized in that: The unit cabinet is divided into at least two small compartments by acrylic plates.

6. The police equipment cabinet based on passive RFID technology according to claim 1 or 2, characterized in that: The binocular camera module includes a transparent acrylic plate and a mounting plate. The left and right cameras are embedded on the mounting plate. Flashlights are installed on the left side of the left camera and the right side of the right camera. The transparent acrylic plate is fixedly mounted on the cabinet. A black soft plastic partition is provided between the transparent acrylic plate and the mounting plate. Camera holes are left on the black soft plastic partition for the left and right cameras to pass through. The flashlights are exposed outside the black soft plastic partition.

7. The police equipment cabinet based on passive RFID technology according to claim 6 is characterized in that: The left side of the left camera is equipped with three flashes, and the right side of the right camera is also equipped with three flashes.

8. The police equipment cabinet based on passive RFID technology according to claim 1 is characterized in that: The cabinet body comprises unit cabinet compartments and a maintenance slot, wherein the unit cabinet compartments are distributed on the left and right sides of the cabinet body, and the maintenance slot is located in the middle area of ​​the cabinet body, and the RFID tag reader and the embedded mainboard are installed in the compartment.

9. The police equipment cabinet based on passive RFID technology according to claim 1, characterized in that: The cabinet body includes a main cabinet and a sub-cabinet. The main cabinet is provided with a main control center, a unit control center and a power supply device, and the sub-cabinet is only provided with a unit control center and a power supply device. Ethernet communication is adopted between the main cabinet and the sub-cabinet. A unit cabinet grid on the main cabinet constitutes a main cabinet equipment cabinet. The main control processor, capacitive touch screen, binocular camera module, fingerprint module, and voice reminder unit are all installed on the cabinet door of the main cabinet equipment cabinet.

10. The police equipment cabinet based on passive RFID technology according to claim 1, characterized in that: The method for locating the label position in the police equipment cabinet comprises the following steps: ① each unit cabinet is numbered in sequence and the numbered unit cabinet is called a spatial point, and the circular polarization antennas distributed in each unit cabinet are also numbered. There are two circular polarization UHF antennas in a unit cabinet, which are respectively distributed on the top and bottom of the unit cabinet; therefore, a unit cabinet is a spatial point. x , corresponding to 2 circularly polarized antennas numbered Ant1 and Ant2; ② When the RFID tag reader receives a command from the main control processor to locate the item tag issued by the user through the capacitive touch screen or an automatic calibration command from the main control processor after power is restored, the RFID reader traverses each circularly polarized antenna inventory tag on the circularly polarized antenna through the antenna splitter, obtains the RSSI signal value of each label in the cabinet when it is counted, the number of times each label is counted by each circularly polarized antenna per unit time, and the antenna number of the read label, and inputs it into the embedded mainboard; ③ The embedded mainboard forms a three-dimensional spatial model of the antenna array according to the spatial point positions of each circularly polarized antenna, in which the antennas are distributed in the spatial point positions in units of antenna feed points, and the circularly polarized antenna The closer the spatial point is to the center of the three-dimensional space model, the better its position is. ④ The embedded mainboard also forms a tag data information table for each tag based on the RSSI signal value each time the tag is counted, the number of times each tag is counted by each circularly polarized antenna per unit time, and the antenna number of the tag being read, and after sorting and calculating according to the strengths of the RSSI signal values ​​in the tag data information table, an RSSI sorting table of the tag data information table is obtained; ⑤ The embedded mainboard uses the RSSI sorting table of the tag data information table and the advantages and disadvantages of the spatial point of the antenna number counted to the tag in the three-dimensional space model of the antenna array to integrate and process, output the optimal antenna spatial point as the positioning position of the tag, transmit it to the main control processor, and display it on the capacitive touch screen.

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