CN110852124A - RFID system capable of detecting vehicle - Google Patents
RFID system capable of detecting vehicle Download PDFInfo
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- CN110852124A CN110852124A CN201910978839.5A CN201910978839A CN110852124A CN 110852124 A CN110852124 A CN 110852124A CN 201910978839 A CN201910978839 A CN 201910978839A CN 110852124 A CN110852124 A CN 110852124A
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- 238000004891 communication Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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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
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
-
- 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
- G06K7/10415—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 fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
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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
- G06K7/10366—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
- G06K7/10475—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 arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices
Abstract
The invention discloses an RFID system capable of detecting a vehicle. The invention relates to an RFID system capable of detecting vehicles, which comprises: the device comprises an antenna, a transmitting and receiving signal separator, a transmitter, a receiver, a reflected signal strength detector, a reflected signal strength comparator and a controller; wherein the antenna is responsible for transmitting and receiving RF signals; the receiving and sending signal separator is responsible for separating the signal transmitted by the antenna from the reflected signal received by the antenna, and the separated received (essentially reflected) signal is sent to the receiver; the receiver is responsible for amplifying the received signal, demodulating and decoding the reflected code information of the RFID card; the reflected signal strength detector is responsible for detecting the reflected signal of the non-RFID reflected code and sending the signal to the reflected signal strength comparator. The invention has the beneficial effects that: the vehicle can be identified and detected.
Description
Technical Field
The invention relates to the field of detecting vehicles, in particular to an RFID system capable of detecting vehicles.
Background
In the parking area is used, whether the parking stall is occupied by the vehicle generally realizes with earth magnetism, infrared or supersound radar.
The traditional technology has the following technical problems:
however, these methods only detect whether there is a car in the parking space, but cannot know which car is, so that vehicle identification technology is used as a supplement in order to collect parking fees.
Disclosure of Invention
The invention aims to provide an RFID system capable of detecting vehicles, which can identify and detect the vehicles.
In order to solve the above technical problem, the present invention provides an RFID system capable of detecting a vehicle, including: the device comprises an antenna, a transmitting and receiving signal separator, a transmitter, a receiver, a reflected signal strength detector, a reflected signal strength comparator and a controller;
wherein the antenna is responsible for transmitting and receiving RF signals;
the receiving and sending signal separator is responsible for separating the signal transmitted by the antenna from the reflected signal received by the antenna, and the separated received (essentially reflected) signal is sent to the receiver;
the receiver is responsible for amplifying the received signal, demodulating and decoding the reflected code information of the RFID label;
the reflected signal strength detector is responsible for detecting the reflected signal of the non-RFID reflected code and sending the signal to the reflected signal strength comparator;
the reflected signal strength comparator is responsible for calibrating (characteristic extraction) and recording the reflected signal of the parking space environment (without vehicles), and comparing and judging the reflected signal strength with the real-time reflected signal strength so as to obtain the result of whether a vehicle stops in front of the antenna;
the controller is responsible for controlling the emitter, the receiver, the reflected signal strength detector and the reflected signal comparator to realize different logic functions so as to achieve the dual functions of vehicle detection and communication with the RFID label.
The invention has the beneficial effects that:
the vehicle can be identified and detected.
In one embodiment, the transceiver further comprises a carrier cancellation system, which is interposed between the transceiver splitter and the receiver, and cancels the system reflection signal reflected by the antenna and the transceiver splitter due to the impedance matching error by adding the RF signal with the adjusted amplitude and phase of the transmission signal and the received RF signal, so as to improve the sensitivity of detecting the strength of the reflection signal.
In one embodiment, the controller controls the transmitter to transmit a carrier signal through an antenna pointing to a space without a vehicle, and the reflected signal strength comparator performs feature extraction (calibration) and recording on the reflected strength signal as a space environment reference strength signal. When a vehicle stops in the parking space, the reflected signal intensity comparator compares the received reflected intensity signal with the parking space environment reference reflected intensity signal, and when the difference value is higher than the error maximum value (comparison threshold value) caused by noise, the parking space is judged to stop.
In one embodiment, the reflected signal strength comparator extracts a reflected signal strength variation characteristic, and when the variation characteristic meets a certain time distribution characteristic, the vehicle is judged to enter or exit.
In one embodiment, the system controls the transmitter and the receiver to communicate with the RFID tag through the controller, and the controller controls the transmitter to transmit the carrier signal to detect the vehicle in the communication interval, so that the vehicle can be detected on the basis of not influencing the RFID communication efficiency.
In one embodiment, when the system performs calibration of the parking space environment reference intensity signal, the carrier cancellation system works simultaneously to cancel a system reflection signal caused by matching error of the antenna and the transceiver signal separator and environmental reflection, and the reflection signal intensity comparator records an intensity signal when the carrier cancellation system is adjusted to the minimum reflection intensity as the parking space environment reference reflection intensity signal.
In one embodiment, there is a 1 to N RF switch between the transceiver splitter and the antennas so that a system can be coupled to multiple antennas so that a system can detect multiple parking spaces, the RF switch also being controlled by the controller. And the reflected signal strength comparator records the reflected signal reference strength signal corresponding to each antenna and the comparison threshold respectively and is used for comparing the reflected signal strength of the corresponding antenna respectively. Wherein N is a positive integer.
In one embodiment, the system further comprises a synchronizer having one end coupled to the controller and the other end coupled to the synchronization bus. The synchronization bus is a bus connecting the RFID systems of a plurality of said probe vehicles. The synchronizer is used for being in communication connection with the RFID systems of other detection vehicles, so that the RFID systems of the detection vehicles can work synchronously without mutual influence, and the purposes of cooperative work of the RFID systems of the detection vehicles in most quantities and monitoring of the parking spaces in many quantities are achieved.
Drawings
Fig. 1 is one of schematic structural diagrams of an RFID system that can detect a vehicle according to the present invention.
Fig. 2 is a second schematic structural diagram of an RFID system capable of detecting a vehicle according to the present invention.
Fig. 3 is a third schematic diagram of the structure of the RFID system capable of detecting vehicles according to the present invention.
FIG. 4 is a fourth schematic diagram of the RFID system of the present invention capable of detecting vehicles.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, an RFID system capable of detecting a vehicle includes: the device comprises an antenna, a transmitting and receiving signal separator, a transmitter, a receiver, a reflected signal strength detector, a reflected signal strength comparator and a controller;
wherein the antenna is responsible for transmitting and receiving RF signals;
the receiving and sending signal separator is responsible for separating the signal transmitted by the antenna from the reflected signal received by the antenna, and the separated received (essentially reflected) signal is sent to the receiver;
the receiver is responsible for amplifying the received signal, demodulating and decoding the reflected code information of the RFID label;
the reflected signal strength detector is responsible for detecting the reflected signal of the non-RFID reflected code and sending the signal to the reflected signal strength comparator;
the reflected signal strength comparator is responsible for calibrating (characteristic extraction) and recording the reflected signal of the parking space environment (without vehicles), and comparing and judging the reflected signal strength with the real-time reflected signal strength so as to obtain the result of whether a vehicle stops in front of the antenna;
the controller is responsible for controlling the emitter, the receiver, the reflected signal strength detector and the reflected signal comparator to realize different logic functions so as to achieve the dual functions of vehicle detection and communication with the RFID label.
The invention has the beneficial effects that:
the vehicle can be identified and detected.
Referring to fig. 2, in one embodiment, the wireless communication system further includes a carrier cancellation system interposed between the transceiver signal separator and the receiver, for canceling a system reflection signal reflected by the transceiver signal separator and the antenna due to an impedance matching error by adding the RF signal with the adjusted amplitude and phase of the transmission signal and the received RF signal, thereby improving the sensitivity of detecting the strength of the reflection signal.
In one embodiment, the controller controls the transmitter to transmit a carrier signal through an antenna pointing to a space without a vehicle, and the reflected signal strength comparator performs feature extraction (calibration) and recording on the reflected strength signal as a space environment reference strength signal. When a vehicle stops in the parking space, the reflected signal intensity comparator compares the received reflected intensity signal with the parking space environment reference reflected intensity signal, and when the difference value is higher than the error maximum value (comparison threshold value) caused by noise, the parking space is judged to stop.
In one embodiment, the reflected signal strength comparator extracts a reflected signal strength variation characteristic, and when the variation characteristic meets a certain time distribution characteristic, the vehicle is judged to enter or exit.
In one embodiment, the system controls the transmitter and the receiver to communicate with the RFID tag through the controller, and the controller controls the transmitter to transmit the carrier signal to detect the vehicle in the communication interval, so that the vehicle can be detected on the basis of not influencing the RFID communication efficiency.
In one embodiment, when the system performs calibration of the parking space environment reference intensity signal, the carrier cancellation system works simultaneously to cancel a system reflection signal caused by matching error of the antenna and the transceiver signal separator and environmental reflection, and the reflection signal intensity comparator records an intensity signal when the carrier cancellation system is adjusted to the minimum reflection intensity as the parking space environment reference reflection intensity signal.
Referring to fig. 3, in one embodiment, a 1 to N RF switch is provided between the transceiver splitter and the antennas so that a system can be connected to a plurality of antennas so that a system can detect a plurality of slots, and the RF switch is also controlled by the controller. And the reflected signal strength comparator records the reflected signal reference strength signal corresponding to each antenna and the comparison threshold respectively and is used for comparing the reflected signal strength of the corresponding antenna respectively. Wherein N is a positive integer.
Referring to fig. 4, in one embodiment, the system further includes a synchronizer having one end connected to the controller and the other end connected to the synchronization bus. The synchronization bus is a bus connecting the RFID systems of a plurality of said probe vehicles. The synchronizer is used for being in communication connection with the RFID systems of other detection vehicles, so that the RFID systems of the detection vehicles can work synchronously without mutual influence, and the purposes of cooperative work of the RFID systems of the detection vehicles in most quantities and monitoring of the parking spaces in many quantities are achieved.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. An RFID system capable of detecting a vehicle, comprising: the device comprises an antenna, a transmitting and receiving signal separator, a transmitter, a receiver, a reflected signal strength detector, a reflected signal strength comparator and a controller;
wherein the antenna is responsible for transmitting and receiving RF signals;
the receiving and sending signal separator is responsible for separating the signal transmitted by the antenna from the reflected signal received by the antenna, and the separated received (essentially reflected) signal is sent to the receiver;
the receiver is responsible for amplifying the received signal, demodulating and decoding the reflected code information of the RFID label;
the reflected signal strength detector is responsible for detecting the reflected signal of the non-RFID reflected code and sending the signal to the reflected signal strength comparator;
the reflected signal strength comparator is responsible for calibrating (characteristic extraction) and recording the reflected signal of the parking space environment (without vehicles), and comparing and judging the reflected signal strength with the real-time reflected signal strength so as to obtain the result of whether a vehicle stops in front of the antenna;
the controller is responsible for controlling the emitter, the receiver, the reflected signal strength detector and the reflected signal comparator to realize different logic functions so as to achieve the dual functions of vehicle detection and communication with the RFID label.
2. The RFID system capable of detecting vehicles as claimed in claim 1, further comprising a carrier cancellation system interposed between the transceiver signal separator and the receiver for increasing sensitivity of detecting the intensity of the reflected signal by adding the amplitude and phase adjusted RF signal of the transmission signal and the received RF signal to cancel a system reflection signal reflected back from the antenna and the transceiver signal separator due to an impedance matching error.
3. The RFID system of claim 1, wherein the controller controls the transmitter to transmit the carrier signal via an antenna pointing to the space without car, and the reflected signal strength comparator performs the feature extraction (calibration) and recording of the reflected strength signal as the reference strength signal of the space environment. When a vehicle stops in the parking space, the reflected signal intensity comparator compares the received reflected intensity signal with the parking space environment reference reflected intensity signal, and when the difference value is higher than the error maximum value (comparison threshold value) caused by noise, the parking space is judged to stop.
4. The RFID system capable of detecting vehicles according to claim 1, wherein the reflected signal strength comparator extracts a characteristic of a change in the reflected signal strength, and determines that the vehicle enters or exits when the characteristic of the change satisfies a certain time distribution characteristic.
5. The RFID system of claim 1, wherein the controller controls the transmitter and the receiver to communicate with the RFID tag during a communication interval, and the controller controls the transmitter to transmit the carrier signal for vehicle detection, thereby detecting the vehicle without affecting the efficiency of RFID communication.
6. The RFID system of claim 1 or 2, wherein when the system performs calibration of the parking space environment reference intensity signal, the carrier cancellation system works simultaneously to cancel the system reflection signal caused by the matching error of the antenna and the transceiver signal separator and the environmental reflection, and the reflection signal intensity comparator records the intensity signal when the carrier cancellation system is adjusted to the minimum reflection intensity as the parking space environment reference reflection intensity signal.
7. The RFID system capable of detecting vehicles according to claim 1, wherein a 1 to N RF switch is provided between the transceiver-splitter and the antennas so that a plurality of antennas can be connected to a system so that a plurality of slots can be detected by one system, the RF switch being also controlled by the controller. And the reflected signal strength comparator records the reflected signal reference strength signal corresponding to each antenna and the comparison threshold respectively and is used for comparing the reflected signal strength of the corresponding antenna respectively. Wherein N is a positive integer.
8. The RFID system for detecting vehicles as claimed in claim 1, wherein the system further comprises a synchronizer having one end connected to the controller and the other end connected to the synchronization bus. The synchronization bus is a bus connecting the RFID systems of a plurality of said probe vehicles. The synchronizer is used for being in communication connection with the RFID systems of other detection vehicles, so that the RFID systems of the detection vehicles can work synchronously without mutual influence, and the purposes of cooperative work of the RFID systems of the detection vehicles in most quantities and monitoring of the parking spaces in many quantities are achieved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910978839.5A CN110852124B (en) | 2019-10-15 | 2019-10-15 | RFID system capable of detecting vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910978839.5A CN110852124B (en) | 2019-10-15 | 2019-10-15 | RFID system capable of detecting vehicle |
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| CN110852124A true CN110852124A (en) | 2020-02-28 |
| CN110852124B CN110852124B (en) | 2024-04-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957922A (en) * | 2009-07-21 | 2011-01-26 | 刘礼白 | Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID) |
| US20140326835A1 (en) * | 2013-05-03 | 2014-11-06 | Thales Canada Inc | Vehicle position determining system and method of using the same |
| CN106355899A (en) * | 2016-11-10 | 2017-01-25 | 上海冉动电子科技有限公司 | Sensing positioning system for vehicles in parking lot based on passive UHF RFID |
| CN108597045A (en) * | 2018-05-04 | 2018-09-28 | 深圳市方格尔科技有限公司 | A kind of running vehicle tolling device and method based on passive vahicles label |
| CN109034313A (en) * | 2018-08-09 | 2018-12-18 | 刘丽 | Parking stall use state detection method, system, reflective tape and anticollision strip |
-
2019
- 2019-10-15 CN CN201910978839.5A patent/CN110852124B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957922A (en) * | 2009-07-21 | 2011-01-26 | 刘礼白 | Air interface uplink channel for shift m sequence spread spectrum radio frequency identification device (RFID) |
| US20140326835A1 (en) * | 2013-05-03 | 2014-11-06 | Thales Canada Inc | Vehicle position determining system and method of using the same |
| CN106355899A (en) * | 2016-11-10 | 2017-01-25 | 上海冉动电子科技有限公司 | Sensing positioning system for vehicles in parking lot based on passive UHF RFID |
| CN108597045A (en) * | 2018-05-04 | 2018-09-28 | 深圳市方格尔科技有限公司 | A kind of running vehicle tolling device and method based on passive vahicles label |
| CN109034313A (en) * | 2018-08-09 | 2018-12-18 | 刘丽 | Parking stall use state detection method, system, reflective tape and anticollision strip |
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| CN110852124B (en) | 2024-04-05 |
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