CN102236804A - Reader-writer - Google Patents
Reader-writer Download PDFInfo
- Publication number
- CN102236804A CN102236804A CN2010101600635A CN201010160063A CN102236804A CN 102236804 A CN102236804 A CN 102236804A CN 2010101600635 A CN2010101600635 A CN 2010101600635A CN 201010160063 A CN201010160063 A CN 201010160063A CN 102236804 A CN102236804 A CN 102236804A
- Authority
- CN
- China
- Prior art keywords
- radio
- frequency
- radio frequency
- write line
- read write
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a reader-writer which is applicable to a wireless real-time positioning system. The reader-writer comprises a control unit and a radio frequency unit, wherein the control unit is connected with the radio frequency unit through a wire; the radio frequency unit comprises three radio frequency channels; and each radio frequency channel comprises a radio frequency module and an antenna. Due to the adoption of the technical scheme, one reader-writer comprises the three radio frequency channels, so data exchange capability is enhanced and tag capacity supported by the real-time positioning system is expanded; meanwhile, by a diversity receiving method, the reader-writer acquires a plurality of fading signals which are counted independently and carry the same information and combines the plurality of received independently counted fading signals so as to reduce the influence of fading and acquire more accurate signal intensity information.
Description
Technical field
The present invention relates to wireless real-time positioning technical field, relate in particular to a kind of read write line.
Background technology
(Real Time Location System RTLS) is meant by wireless communication technology real-time positioning system, in a space specified (office building, place, city, the whole world), in real time or approach the real-time system to target localization.The positional information of target is to obtain by the physical characteristics of measuring radiowave.
Real-time positioning system is a kind of positioning system based on ranging technology, can be divided into by received signal intensity (received signal strength indicator, RSSI) location, by (time ofarrival time of arrival, TOA) or time of arrival poor (time difference on arrival, TDOA) location is by arriving angle (angle of arrival, AOA) several technical schemes such as location.
Wherein the principle of work based on the real-time positioning system of received signal intensity is: wireless signal strength is along with the increase of signal transmission distance can decay, and in free space, the decay of semaphore and the relation of distance satisfy following formula:
LossDB＝-27.55+20Log(D)+20Log(F)
Wherein D represents transmission range, and the m of unit, F represent the frequency of signal, the mhz of unit, and regularly (such as 433.92MHz, 2.45GHz), semaphore has definite funtcional relationship in the decay of free space with distance when signal frequency one.If the signal intensity that signal source is sent can determine, then the signal intensity received of the point of certain in free space and the distance in this range transmission source just have definite funtcional relationship:
RecvDB＝SendDB-LossDB＝SendDB+27.55-20Log(D)-20Log(F)
Different location arrangements signal receiver in free space, each point can be determined the distance of emissive source apart from this point by signal intensity, thereby emissive source can be determined on the sphere (three dimensions) or circumference (two-dimensional space) that with this shop are the center, by the common factor of a plurality of spheres or circumference, can determine the coordinate of emissive source at three dimensions or two-dimensional space.
Based on above-mentioned ultimate principle, real-time positioning system is arranged in read write line in the locating area according to certain requirement, and read write line quantity is at least more than three.After self coded message that receives that the mode of positioning label with radiofrequency signal send out, over-the-air protocol is by appointment resolved and is handled, by wired or wireless mode related data (label ID, tag state and signal intensity) is uploaded to engine of positioning again, carry out tag location.
Read write line comprises control module (microprocessor, data buffering), radio frequency unit, external data communication interface and external antenna at present.
Wherein the control module function is: microprocessor is according to protocol analysis and set up the packet that receives and send by radio frequency unit; The duty and the parameter of control radio frequency unit; Finish necessary mathematical operation (add, decipher) and data processing; Finish data communication with host computer by the external data communication interface, this is the wire communication pattern; Carry out exchanges data by radio frequency unit via AP and host computer, this is a wireless communications mode.
The radio frequency unit function is: baseband signal is modulated; Radiofrequency signal is carried out demodulation; Can carry out low noise to the radiofrequency signal that receives amplifies; Treat emitting radio frequency signal and can carry out power amplification; Have frequency synthesis and mixing function; The filter function that intermediate-freuqncy signal is had BREATHABLE BANDWIDTH; The coded system that baseband signal is had multiple choices; Carry out exchanges data by digit buffer and interface and control module.
There is following technological deficiency in this read write line structure to the real-time positioning system that adopts signal intensity scheme location:
1, for the real-time positioning system that needs safety certification, said structure has reduced positioning system label capacity because repeatedly exchanges data between label and the read write line can cause radio communication resource anxiety, reduces by 1/3rd at least.
2, bearing accuracy is inaccurate.When adopting the signal strength methods location, the radiowave of label emission can be subjected to the influence of landform, barrier and produce reflection, diffraction, scattering etc. in transmission course, thereby makes electric wave along various propagated.Because multipath transmisstion, the signal that read write line receives is amplitude, phase place, frequency and is the synthetic result of multiple signals on time of arrival, thereby can produce phenomenons such as the frequency selective fading of signal and time delay expansion.The multipath transmission can cause wireless signal to be expanded at different dimensions.These expansions comprise: time delay expansion, frequency expansion (Doppler's exhibition frequently) and angle spread.These expansions produce significant effects from different aspects to signal.Existing be difficult to solve this class problem as the positioning system of location technology, cause locating effect and precision to be difficult to satisfy technical requirement with signal intensity.
Summary of the invention
The objective of the invention is to propose a kind of read write line, in wireless real-time positioning system, can improve the label capacity that real-time positioning system is supported, improve the degree of accuracy of location.
For reaching this purpose, the present invention by the following technical solutions:
A kind of read write line, be applicable to wireless real-time positioning system, comprise control module and radio frequency unit, described control module and described radio frequency unit adopt wired connection, described radio frequency unit further comprises three radio-frequency channels, and each radio-frequency channel comprises a radio-frequency module and an antenna.
Three antennas of described three radio-frequency channels are placed according to equilateral triangle in surface level.
Distance and the proportional relation of frequency of operation wavelength between two antennas.
Distance between two antennas is 1/4th of a frequency of operation wavelength.
Two radio-frequency channels in described three radio-frequency channels are set to accepting state, are used to receive the information that label sends, and a radio-frequency channel is set to transmit status, is used for transmission information to label.
Adopted technical scheme of the present invention, make a read write line comprise three radio-frequency channels, improved data exchange capability, enlarged the capacity of the label that real-time positioning system supports, simultaneously by adopting the way of diversity reception, make read write line obtain a plurality of statistics independent, carry the fading signal of same information, and a plurality of statistics of receiving independently fading signal merge (comprise and selecting and combination) and, obtain signal strength information more accurately to reduce the influence that declines.
Description of drawings
Fig. 1 is the structural representation of read write line in the specific embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the structural representation of read write line in the specific embodiment of the invention.As shown in Figure 1, this read write line comprises control module 1 and radio frequency unit 2, and radio frequency unit further comprises three radio-frequency channels, and each radio-frequency channel comprises a radio-frequency module 201 and an antenna 202, and control module and described radio frequency unit adopt wired connection.
Three radio-frequency channels are respectively with different frequency work, be set to three different channels, bearing the date interworkmg of corresponding authentication layers in three layers of authentication, can the phase mutual interference, first radio-frequency channel is set to accepting state, is used to receive the self-ID information that positioning label sends; Second radio-frequency channel is set to transmit status, in order to send the authentication information of read write line to positioning label; The 3rd radio frequency passage is set to accepting state, in order to receive the authentication information that positioning label is responded.Wherein cryptographic algorithm, key all are stored in the control module of read write line.
If introduce more verification process, suitably the quantity of extensive radio frequency passage increases antenna simultaneously.
Because the influence of multipath effect, the signal intensity of certain known point is vector and (addition or subtract each other) of main signal and multipath signal, so the signal that reading and writing device antenna receives not is that positioning label arrives the real signal intensity in this position, therefore the antenna of three radio-frequency channels of read write line is placed according to equilateral triangle in surface level, antenna distance and the proportional relation of positioning system frequency of operation wavelength, for example quarter-wave.By adopting the way of diversity reception, make read write line obtain a plurality of statistics independences, carry the fading signal of same information, simultaneously a plurality of statistics of receiving independently fading signal merge (comprise and selecting and combination) and, obtain signal strength information more accurately to reduce the influence of decline.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1. read write line, be applicable to wireless real-time positioning system, it is characterized in that, comprise control module and radio frequency unit, described control module and described radio frequency unit adopt wired connection, described radio frequency unit further comprises three radio-frequency channels, and each radio-frequency channel comprises a radio-frequency module and an antenna.
2. a kind of read write line according to claim 1 is characterized in that, three antennas of described three radio-frequency channels are placed according to equilateral triangle in surface level.
3. a kind of read write line according to claim 2 is characterized in that, distance and the proportional relation of frequency of operation wavelength between two antennas.
4. a kind of read write line according to claim 3 is characterized in that, the distance between two antennas is 1/4th of a frequency of operation wavelength.
5. according to the described a kind of read write line of arbitrary claim among the claim 1-4, it is characterized in that two radio-frequency channels in described three radio-frequency channels are set to accepting state, be used to receive the information that label sends, a radio-frequency channel is set to transmit status, is used for transmission information to label.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101600635A CN102236804A (en) | 2010-04-23 | 2010-04-23 | Reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101600635A CN102236804A (en) | 2010-04-23 | 2010-04-23 | Reader-writer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102236804A true CN102236804A (en) | 2011-11-09 |
Family
ID=44887439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101600635A Pending CN102236804A (en) | 2010-04-23 | 2010-04-23 | Reader-writer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102236804A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605996A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华士精成科技有限公司 | Active radio frequency identification system |
| CN104850874A (en) * | 2015-04-10 | 2015-08-19 | 上海十贝电子科技有限公司 | Method and system for accurately positioning single vector reader-writer |
| CN107122811A (en) * | 2017-04-11 | 2017-09-01 | 公安部第三研究所 | The intelligent RFID reader and method positioned in real time for active radio frequency label |
| CN107566790A (en) * | 2017-08-24 | 2018-01-09 | 公安部第三研究所 | With reference to REID and the real time monitoring apparatus and method of Video Supervision Technique |
| CN108062494A (en) * | 2017-12-18 | 2018-05-22 | 天津科畅慧通信息技术有限公司 | A kind of split type ultrahigh frequency reader-writer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2716448Y (en) * | 2004-07-02 | 2005-08-10 | 南京三宝科技股份有限公司 | Combined electronic lock |
| CN1834981A (en) * | 2006-02-24 | 2006-09-20 | 上海坤源信息科技有限公司 | Modular type UHF reading writer |
| US20070040681A1 (en) * | 2005-08-19 | 2007-02-22 | Ensyc Technologies | Low cost RFID system |
| CN201057561Y (en) * | 2007-04-17 | 2008-05-07 | 深圳市远望谷信息技术股份有限公司 | Fixed radio frequency reader-writer |
-
2010
- 2010-04-23 CN CN2010101600635A patent/CN102236804A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2716448Y (en) * | 2004-07-02 | 2005-08-10 | 南京三宝科技股份有限公司 | Combined electronic lock |
| US20070040681A1 (en) * | 2005-08-19 | 2007-02-22 | Ensyc Technologies | Low cost RFID system |
| CN1834981A (en) * | 2006-02-24 | 2006-09-20 | 上海坤源信息科技有限公司 | Modular type UHF reading writer |
| CN201057561Y (en) * | 2007-04-17 | 2008-05-07 | 深圳市远望谷信息技术股份有限公司 | Fixed radio frequency reader-writer |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605996A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华士精成科技有限公司 | Active radio frequency identification system |
| CN103605996B (en) * | 2013-11-25 | 2016-08-31 | 深圳市华士精成科技有限公司 | A kind of active radio frequency identification system |
| CN104850874A (en) * | 2015-04-10 | 2015-08-19 | 上海十贝电子科技有限公司 | Method and system for accurately positioning single vector reader-writer |
| CN104850874B (en) * | 2015-04-10 | 2018-10-02 | 上海十贝电子科技有限公司 | The precise positioning method and system of single vector reader |
| CN107122811A (en) * | 2017-04-11 | 2017-09-01 | 公安部第三研究所 | The intelligent RFID reader and method positioned in real time for active radio frequency label |
| CN107566790A (en) * | 2017-08-24 | 2018-01-09 | 公安部第三研究所 | With reference to REID and the real time monitoring apparatus and method of Video Supervision Technique |
| CN108062494A (en) * | 2017-12-18 | 2018-05-22 | 天津科畅慧通信息技术有限公司 | A kind of split type ultrahigh frequency reader-writer |
| CN108062494B (en) * | 2017-12-18 | 2021-01-29 | 天津科畅慧通信息技术有限公司 | Split ultrahigh frequency reader-writer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101965050B (en) | Method and apparatus for estimating location of a wireless station using multi-beam transmission | |
| Zhang et al. | Real-time locating systems using active RFID for Internet of Things | |
| CA2999095C (en) | System and method for determining location information for a mobile radio transmitter | |
| CN103984971B (en) | Wireless location method and system based on aerial array phase difference direction finding radio frequency identification | |
| CN103402258B (en) | Wi-Fi (Wireless Fidelity)-based indoor positioning system and method | |
| US7174172B2 (en) | System and method for asset location in wireless networks | |
| US8818408B2 (en) | Real-time network node location system and method | |
| CN106793087B (en) | Array antenna indoor positioning method based on AOA and PDOA | |
| CN109792278A (en) | Communication equipment and method for communication and position determination based on RF | |
| CN204166130U (en) | Radio frequency locating device and system | |
| CN106940437B (en) | Indoor positioning method, equipment and system | |
| CN103747521A (en) | Real-time location method and system based on radio frequency identification of mobile communication terminal | |
| CN104221413A (en) | Method, apparatus, and computer program product for secure distance bounding based on direction measurement | |
| CN101842715A (en) | Indoor positioning system and method | |
| CN101131432A (en) | Positioning method for wireless radio frequency recognition system and device thereof | |
| CN103644905A (en) | Situation-related indoor positioning method and system | |
| CN106291461B (en) | A kind of method, apparatus, server and the system of RFID indoor positioning | |
| CN102236804A (en) | Reader-writer | |
| KR101814698B1 (en) | Method for simultaneously setting coordinates of anchor and tag using wireless transmission / reception and communication system thereof | |
| KR101121907B1 (en) | Real time locating system and method using directional antennas | |
| CN103069778A (en) | Method for location | |
| CN104849741A (en) | GPS and radio frequency technology-based hybrid location method | |
| CN111372181A (en) | Indoor positioning method and device based on Bluetooth and storage medium | |
| CN113514794B (en) | Indoor three-dimensional positioning method based on AOA and TDOA | |
| CN102238536B (en) | Wireless real time location system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111109 |