CN110633591A - Radio frequency identification reader and method of use - Google Patents
Radio frequency identification reader and method of use Download PDFInfo
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- CN110633591A CN110633591A CN201910880837.2A CN201910880837A CN110633591A CN 110633591 A CN110633591 A CN 110633591A CN 201910880837 A CN201910880837 A CN 201910880837A CN 110633591 A CN110633591 A CN 110633591A
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- radio frequency
- identified
- frequency identification
- identification reader
- directional antenna
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10198—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes
- G06K7/10217—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes parameter settings controlling the transmission power of the interrogator
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
- G06K7/10376—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable
- G06K7/10386—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable the interrogation device being of the portable or hand-handheld type, e.g. incorporated in ubiquitous hand-held devices such as PDA or mobile phone, or in the form of a portable dedicated RFID reader
Abstract
The invention provides a radio frequency identification reader, which is characterized by comprising: a directional antenna for directionally transmitting or receiving a signal; the distance detection module is used for detecting the distance from the object to be identified to the radio frequency identification reader; and the control unit is used for adjusting the transmitting power of the directional antenna according to the distance from the object to be identified to the radio frequency identification reader.
Description
Technical Field
The present invention relates to rfid readers and methods for using the same, and more particularly, to an rfid reader with adjustable transmit power and a method for using the same.
Background art:
radio Frequency Identification (RFID) is one of automatic Identification technologies, and performs contactless bidirectional data communication in a Radio Frequency manner, and reads and writes a recording medium (an electronic tag or a Radio Frequency card) in a Radio Frequency manner, thereby achieving the purposes of identifying a target and exchanging data. A complete set of RFID system, it is made up of Reader writer (Reader), electronic label (Tag) and data management system, its working principle is that the Reader writer (Reader) transmits a radio wave energy of the particular frequency, in order to drive the circuit and send out the internal data, the Reader just receives and deciphers the data in order at this moment, send to the data management system and do the corresponding processing. The RFID technology relies on electromagnetic waves, and does not need to connect physical contact of both parties, even the RFID reader of a high frequency band can simultaneously identify and read the contents of a plurality of tags, so that the radio frequency identification technology is more and more widely applied.
However, since the electromagnetic wave for radio frequency identification is invisible, the reader/writer has blindness in reading the tag, and the user does not know at all which position the tag is read. In addition, no matter how far or how close an article to be checked is, the antenna of the reader-writer adopts the same power to identify the label, so that when an article in a short distance is identified, the power is relatively overhigh, and waste is caused; when a long-distance article is read, the power consumption is relatively low, so that a part of the long-distance tags are missed and are not read.
The present invention addresses the above problems by providing a new radio frequency identification reader and method of use thereof, employing new methods and technical means to solve these problems.
Disclosure of Invention
In view of the problems faced by the background art, the present invention is directed to a radio frequency identification reader with adjustable transmission power and a method for using the same.
In order to achieve the purpose, the invention adopts the following technical means:
the invention provides a radio frequency identification reader, which is characterized by comprising: a directional antenna for directionally transmitting or receiving a signal; the distance detection module is used for detecting the distance from the object to be identified to the radio frequency identification reader; and the control unit is used for adjusting the transmitting power of the directional antenna according to the distance from the object to be identified to the radio frequency identification reader.
Optionally, the control unit adjusts the transmitting power of the directional antenna to be positively correlated with the distance from the article to be identified to the rfid reader.
Optionally, the directional antenna is both a transmit antenna and a receive antenna.
Optionally, a laser module is included for emitting an aiming pattern aimed at the object to be identified, the aiming pattern substantially coinciding with the reception range of the directional antenna.
Optionally, the system comprises a camera and a display screen for acquiring and displaying images of the object to be identified, respectively, wherein the display screen has a display area substantially coinciding with a receiving range of the directional antenna.
The invention provides a using method of a radio frequency identification reader, which is characterized by comprising the following steps: the method comprises the following steps: detecting the distance from the article to be identified to the radio frequency identification reader through a distance detection module; step two: adjusting the power of a directional antenna through a control unit to enable the power of the directional antenna to be matched with the distance from an article to be identified to the radio frequency identification reader; step three: the method comprises the steps of transmitting radio frequency signals towards an article to be identified through a directional antenna and receiving signals fed back by an electronic tag on the article to be identified or directly receiving signals transmitted by the electronic tag on the article to be identified.
Optionally, the transmitting power of the directional antenna is positively correlated with the distance from the article to be identified to the rfid reader.
Optionally, the rfid reader includes a laser module, and in the first step, the laser module emits an aiming pattern to aim at the object to be identified, and an aiming range of the aiming pattern substantially coincides with a receiving range of the directional antenna.
Optionally, the directional antenna is both a transmit antenna and a receive antenna.
Optionally, the rfid reader includes a camera and a display screen, which are respectively used for collecting and displaying an image of the object to be identified, and the display screen has a display area, and the display area substantially coincides with the receiving range of the directional antenna.
Compared with the prior art, the invention has the following beneficial effects:
according to the radio frequency identification reader, the distance from an article to be identified to the radio frequency identification reader is detected through the distance detection module, and the control unit adjusts the transmitting power of the directional antenna according to the distance, so that the transmitting power of the directional antenna is matched with the distance from the article to be identified, the transmitting power of the directional antenna is reduced when the article to be identified is close to the distance, and power consumption is reduced; and when the distance of the object to be identified is longer, the transmitting power of the directional antenna is increased so as to increase the identification distance of the radio frequency identification reader.
Drawings
FIG. 1 is a schematic view of a first embodiment of an RFID reader of the present invention, showing the RFID reader aimed at an item to be identified by an aiming pattern;
FIG. 2 is a block diagram of the RFID reader of FIG. 1;
FIG. 3 is a schematic diagram of a first embodiment of an RFID reader according to the present invention, with an aiming pattern indicating the receiving range of a directional antenna;
FIG. 4 is an enlarged view of the RFID reader of FIG. 1 showing a display frame showing a schematic view of an item to be identified;
FIG. 5 is a flow chart of a method of using a first embodiment of the RFID reader of the present invention;
FIG. 6 is a block diagram of a second embodiment of a radio frequency identification reader of the present invention;
FIG. 7 is a flow chart of a method of using a second embodiment of the RFID reader of the present invention.
Detailed description of the embodiments reference is made to the accompanying drawings in which:
Detailed Description
For a better understanding of the objects, structure, features, and functions of the invention, reference should be made to the drawings and detailed description that follow.
As shown in fig. 1 and fig. 2, in a first embodiment of the radio frequency identification reader 100 of the present invention, the radio frequency identification reader 100 mainly includes a directional antenna 1, a laser module 2, a distance detection module 9, a camera 6, a display screen 5, a trigger button 3, and a control unit 4.
As shown in fig. 3, the directional antenna 1 is designed to transmit or receive signals through a certain radiation angle, and the reception ranges a (a') of the directional antenna 1 on the vertical planes at different distances along the maximum radiation direction X are all precisely determined to be a known shape, which is usually an irregular shape, but can be adjusted to a regular shape, such as a circle or an ellipse, by a certain technical means according to the needs. In this embodiment, the directional antenna 1 is both a transmitting antenna and a receiving antenna; in other embodiments, the directional antenna 1 may be only a receiving antenna, so that a transmitting antenna may be additionally provided.
Referring to fig. 2 again, the distance detection module 9 is used to detect the distance between the rfid reader 100 and the object 8 to be identified, and the distance detection module 9 may be a module with high precision for short-distance measurement, such as an infrared distance sensor, a laser distance measurement module, an ultrasonic distance measurement module, and the like. In this embodiment, the distance detection module 9 is an infrared distance sensor.
With continued reference to fig. 3, the laser module 2 includes a laser emitter 21 and an optical element 22, the optical element 22 is a diffractive optical element 22, such that the laser emitted from the laser emitter 21 penetrates the optical element 22 to generate an aiming pattern P (P ') with a desired shape, the shape of the aiming pattern P (P') is consistent with the shape of the receiving range a (a ') of the directional antenna 1, and the projection direction of the aiming pattern P (P') generated by the laser module 2 is coaxially or parallel to the maximum receiving direction of the directional antenna 1, preferably coaxially, such that the aiming pattern P (P ') generated by the laser module 2 is approximately coincident with the receiving range a (a') of the directional antenna 1 at a certain distance from the rfid reader 100. Further, since the reception range a (Α ') of the directional antenna 1 changes with increasing distance, the optical element 22 is designed to vary the size of the aiming pattern P (P ') with increasing distance in synchronism with the reception range a (Α ') of the directional antenna 1, so that the aiming pattern P (P ') always remains substantially coincident with the reception range a (Α ') of the directional antenna 1 at different distances. The reception range a (a ') of the directional antenna 1 at different distances can be accurately indicated by the aiming pattern P (P').
The camera 6 is used for acquiring an image of an object 8 to be identified, the optical axis of the camera 6 is coaxially arranged or parallelly arranged with the maximum radiation direction X (or the maximum receiving direction) of the directional antenna 1, and the receiving range a (a') of the directional antenna 1 is located in the field of view of the camera 6.
As shown in fig. 1 and 4, a display area 51 is provided on the display screen 5, the display area 51 is shown on the display screen 5 by lines, so as to form a display frame, the image of the object 8 to be identified collected by the camera 6 is displayed on the display screen 5, and since the shape of the display frame is manually set to substantially coincide with the receiving range a (a') of the directional antenna 1, the user can adjust the shape of the display frame so that the object 8 to be identified completely falls within the range of the display frame, or the display frame only frames the object 8 to be identified and does not frame other objects. In other embodiments, the display area 51 may be the entire display screen 5, that is, the display range of the entire display screen 5 substantially coincides with the receiving range a (a') of the directional antenna 1, without providing a display frame. Since the display area 51 and the aiming pattern P (P ') both have the function of indicating the receiving range a (a') of the directional antenna 1, in some embodiments, either one of them may be selected, as in other embodiments, the laser module 2 may not be provided or the display area 51 may not be provided.
As shown in fig. 2 and 4, the trigger button 3 is electrically connected to the control unit 4, and is used for controlling the laser module 2 to emit an aiming pattern P (P') via the control unit 4, and controlling the distance detection module 9 to detect a distance and control the directional antenna 1 to emit or receive a signal; of course, the camera 6 may also be set to automatically capture images upon triggering or to capture images upon manual activation. Firstly, the control unit 4 controls the laser module 2 to project an aiming pattern P (P') towards the object 8 to be identified, and at the same time, controls the distance detection module 9 to detect the distance between the object 8 to be identified and the rfid reader 100, the distance detection module 9 feeds the distance back to the control unit 4, the control unit 4 adjusts the transmitting power of the directional antenna 1 according to the distance between the object 8 to be identified and the rfid reader 100, since the transmitting power of the directional antenna 1 is larger and the radiating distance is longer under the condition that the structure of the directional antenna 1 is not changed, that is, the farther the electronic tag 81 on the object 8 to be identified can be identified, the transmitting power of the directional antenna 1 is positively correlated with the distance between the object 8 to be identified and the rfid reader 100, and here, a relation table or a relation table between the transmitting power of the directional antenna 1 and the distance between the object 8 to be identified and the rfid reader 100 can be established in advance And after the control unit 4 obtains the distance of the object 8 to be identified, the relation table or the function relation can be called, and corresponding setting is carried out on the transmitting power of the directional antenna 1.
Then, the control unit 4 controls the directional antenna 1 to start transmitting or receiving signals to activate or read the electronic tag 81 on the object 8 to be identified, which may be separated from the ranging process of the distance detection module 9 by a certain time to avoid that the directional antenna 1 starts receiving signals before the distance is not measured and inadvertently reads the electronic tag 81 which is not needed to be read nearby. Specifically, this can be achieved through a time sequence control, for example, after the user triggers the trigger button 3, the control unit 4 first controls the distance detection module 9 to detect the distance of the object 8 to be identified, and after a certain time (which can be set as required, for example, 3 seconds), the control unit 4 controls the directional antenna 1 to start receiving signals; or, the method can also be implemented by a combined triggering manner, for example, after the user triggers the trigger button 3, the control unit 4 first controls the distance detection module 9 to detect the distance, and when the user triggers another button 7 again, the control unit 4 controls the directional antenna 1 to start receiving signals; or after the user triggers the trigger key 3, the control unit 4 firstly controls the distance detection module 9 to detect the distance, and when the gesture of the user is kept unchanged for a certain time, the control unit 4 controls the directional antenna 1 to start receiving signals; and so on.
The control unit 4 further reads out the signal received by the directional antenna 1 and displays the read-out information on the display screen 5.
Specifically, as shown in fig. 5, a flow chart of a method for using the rfid reader 100 according to the present invention includes the following steps:
s1: the distance from the article 8 to be identified to the rfid reader 100 is detected by the distance detection module 9.
Specifically, after the user approximately aligns the rfid reader 100 with the area where the object 8 to be identified is located, the user further adjusts the position of the aiming pattern P (P ') to precisely frame the area where the object 8 to be identified is located by pressing the trigger button 3 to trigger the laser module 2 to emit the aiming pattern P (P'). At the same time, the distance detection module 9 starts to detect the distance between the article 8 to be identified and the rfid reader 100. The size of the aiming pattern P (P ') may be exactly the same as the area of the object 8 to be identified, or may be slightly larger than the area of the object 8 to be identified, so that all the objects 8 to be identified can be selected in one frame without selecting other objects, or the size of the aiming pattern P (P') may be smaller than the area of the object 8 to be identified, and the user may traverse the area of the object 8 to be identified by moving the rfid reader 100 up and down and left and right.
As previously mentioned, the display area 51 on the display screen 5 may also function similarly to the aiming pattern P (P'), so that they may be replaced or they may work in conjunction to assist the user in locating the item 8 to be identified. In some embodiments, the object 8 to be identified may not be aimed or located through the laser module 2 and the display area 51 on the display screen 5, that is, the laser module 2 may not be provided, and the display area 51 may not be provided on the display screen 5.
S2: the power of the directional antenna 1 is adjusted by the control unit 4, so that the power of the directional antenna 1 matches the distance from the article 8 to be identified to the rfid reader 100.
This process can be referred to as described above.
S3: the directional antenna 1 transmits radio frequency signals to a selected area of the aiming pattern P (P ') and receives signals fed back by the electronic tags 81 in the selected area or directly receives the electronic tags 81 in the selected area of the aiming pattern P (P '), wherein the maximum radiation direction X of the directional antenna 1 is coaxially arranged with or parallel to the projection direction of the aiming pattern P (P '). The electronic tag 81 may be an active tag, a passive tag or a semi-active tag.
Taking a passive tag as an example, after the laser module 2 emits the aiming pattern P (P ') for a certain time, the control unit 4 controls the directional antenna 1 to emit a radio frequency signal to the selected area of the aiming pattern P (P') to activate the electronic tag 81 in the selected area, so that the electronic tag 81 feeds back the signal to the rfid reader 100 and is received by the directional antenna 1, and the control unit 4 further decodes the signal fed back by the electronic tag 81 and displays the decoded information on the display screen 5.
If the electronic tag 81 is an active tag, after the laser module 2 emits the aiming pattern P (P ') for a certain time, the control unit 4 controls the directional antenna 1 to receive the signal emitted by the electronic tag 81 in the selected area of the aiming pattern P (P'), and the control unit 4 further decodes the signal fed back by the electronic tag 81 and displays the decoded information on the display screen 5. Semi-active tags are similar.
Referring to fig. 6, a second embodiment of the rfid reader 100 of the present invention is shown, which differs from the first embodiment in that: the distance between the object 8 to be identified and the rfid reader 100 is detected by a laser ranging module 2 ', and since the laser ranging module 2 ' can emit a light spot to assist the user in aiming at the object 8 to be identified, the laser module 2 for generating the aiming pattern P (P ') in the first embodiment is not provided. The laser ranging module 2 ' is a phase laser ranging module 2 ' or a triangular laser ranging module 2 ' to improve the precision of short-distance ranging. The projection direction of the light spot and the maximum receiving direction of the directional antenna 1 are coaxially arranged or arranged in parallel, so that when the light spot is aimed at the object 8 to be identified, the directional antenna 1 is also aimed at the object 8 to be identified.
As shown in fig. 7, which is a flow chart of a method of using the second embodiment of the rfid reader 100 of the present invention, includes the following steps:
s10: the laser ranging module 2' emits light spots to aim at the object 8 to be identified, and measures the distance from the object 8 to be identified to the radio frequency identification reader 100.
S20: the power of the directional antenna 1 is adjusted by the control unit 4, so that the power of the directional antenna 1 matches the distance from the article 8 to be identified to the rfid reader 100.
S30: the directional antenna 1 transmits radio frequency signals towards the object 8 to be identified and receives signals fed back by the electronic tag 81 on the object 8 to be identified or directly receives signals transmitted by the electronic tag 81 on the object 8 to be identified.
The radio frequency identification reader and the using method have the following beneficial effects:
1. according to the radio frequency identification reader 100, the distance from an article 8 to be identified to the radio frequency identification reader 100 is detected through the distance detection module 9, and the control unit 4 adjusts the transmitting power of the directional antenna 1 according to the distance, so that the transmitting power of the directional antenna 1 is matched with the distance of the article 8 to be identified, and the transmitting power of the directional antenna 1 is reduced when the article 8 to be identified is close to the distance, and the power consumption is reduced; and when the distance of the object 8 to be identified is longer, the transmitting power of the directional antenna 1 is increased so as to increase the identification distance of the radio frequency identification reader 100.
2. According to the radio frequency identification reader 100, the distance from an object 8 to be identified to the radio frequency identification reader 100 is detected through the laser ranging module 2 ', the laser ranging module 2' is used for generating light spots at the same time and guiding a user to aim at the object 8 to be identified, and the control unit 4 adjusts the transmitting power of the directional antenna 1 according to the distance, so that the transmitting power of the directional antenna 1 is matched with the distance of the object 8 to be identified, the transmitting power of the directional antenna 1 is reduced when the object 8 to be identified is close to the distance, and power consumption is reduced; and when the distance of the object 8 to be identified is longer, the transmitting power of the directional antenna 1 is increased so as to increase the identification distance of the radio frequency identification reader 100.
The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all technical changes that can be made by applying the present specification and the drawings are included in the scope of the present invention.
Claims (10)
1. A radio frequency identification reader, comprising:
a directional antenna for directionally transmitting or receiving a signal;
the distance detection module is used for detecting the distance from the object to be identified to the radio frequency identification reader;
and the control unit is used for adjusting the transmitting power of the directional antenna according to the distance from the object to be identified to the radio frequency identification reader.
2. The radio frequency identification reader of claim 1, wherein: the control unit adjusts the transmitting power of the directional antenna to be positively correlated with the distance from the object to be identified to the radio frequency identification reader.
3. The radio frequency identification reader of claim 1, wherein: the directional antennas are both transmit and receive antennas.
4. The radio frequency identification reader of claim 1, wherein: the device comprises a laser module used for emitting aiming patterns aiming at an object to be identified, wherein the aiming patterns are approximately coincident with the receiving range of the directional antenna.
5. The radio frequency identification reader of claim 1, wherein: the device comprises a camera and a display screen, wherein the camera and the display screen are respectively used for collecting and displaying images of an object to be identified, the display screen is provided with a display area, and the display area is approximately overlapped with the receiving range of the directional antenna.
6. A method for using a radio frequency identification reader is characterized by comprising the following steps:
the method comprises the following steps: detecting the distance from the article to be identified to the radio frequency identification reader through a distance detection module;
step two: adjusting the power of a directional antenna through a control unit to enable the power of the directional antenna to be matched with the distance from an article to be identified to the radio frequency identification reader;
step three: the method comprises the steps of transmitting radio frequency signals towards an article to be identified through a directional antenna and receiving signals fed back by an electronic tag on the article to be identified or directly receiving signals transmitted by the electronic tag on the article to be identified.
7. The method of using a radio frequency identification reader as claimed in claim 6, wherein: the transmitting power of the directional antenna is positively correlated with the distance from the object to be identified to the radio frequency identification reader.
8. The method of using a radio frequency identification reader as claimed in claim 6, wherein: the radio frequency identification reader comprises a laser module, in the first step, the laser module emits an aiming pattern to aim at an object to be identified, and the aiming range of the aiming pattern is approximately overlapped with the receiving range of the directional antenna.
9. The method of using a radio frequency identification reader as claimed in claim 6, wherein: the directional antennas are both transmit and receive antennas.
10. The method of using a radio frequency identification reader as claimed in claim 6, wherein: the radio frequency identification reader comprises a camera and a display screen, the camera and the display screen are respectively used for collecting and displaying images of an object to be identified, the display screen is provided with a display area, and the display area is approximately overlapped with the receiving range of the directional antenna.
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| CN201910880837.2A CN110633591A (en) | 2019-09-18 | 2019-09-18 | Radio frequency identification reader and method of use |
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| CN201910880837.2A CN110633591A (en) | 2019-09-18 | 2019-09-18 | Radio frequency identification reader and method of use |
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Cited By (1)
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| CN112200026A (en) * | 2020-09-25 | 2021-01-08 | 浙江大华技术股份有限公司 | Non-motor vehicle violation identification method, device, equipment and medium |
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