CN104318191A - UHFRFID (Ultra High Frequency Radio Frequency Identification Device) self-adaptation working method - Google Patents
UHFRFID (Ultra High Frequency Radio Frequency Identification Device) self-adaptation working method Download PDFInfo
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Abstract
The invention discloses a UHFRFID (Ultra High Frequency Radio Frequency Identification Device) self-adaptation working method which includes three self-learning processes: counting the tag number read by a reader at each frequency point and corresponding RSSI (Received Signal Strength Indicator) values by placing UHFRFID tag test boards in specific areas read by antennas, screening the frequency points in a frequency hopping range, selecting several optimum reading frequency points to serve frequency hopping points, and accordingly improving the reading efficiency; conducting adjustment testing on examined transmitting power by placing the UHFRFID tag test boards in specific areas read by the antennas to obtain the minimum transmitting power which meets the examination requirement. The UHFRFID self-adaptation working method can effectively solve the problems of application environment changes of the fixed UHFRFID reader and complex parameter setting, and makes the fixed UHFRFID reader to have a good use effect.
Description
Technical field
The present invention proposes a kind of self-adaptation method of work based on the fixed UHF RFID reader of AS3992, belongs to Internet of Things microwave radio recognition technology field.
Background technology
Along with the development of Internet of Things industry, ultrahigh frequency readers (UHF RFID) technology obtains rapid popularization owing to having the features such as decipherment distance is far away, recognition accuracy is high, recognition speed is fast, antijamming capability is strong, forms a kind of brand-new ladder of management gradually.Because fixed UHF RFID reader applied environment is changeable, optimum configurations is numerous and diverse, brings a lot of inconvenience to operator, so reader can be arranged automatically according to applied environment, just necessary with the result of use reaching the best.
Fixed UHF RFID reader generally has multiple antenna (i.e. hyperchannel), for the use of multiple antennas, mostly arrange at host computer (i.e. PC or the server that controls reader), first select the antenna that will use, then carry out some and interrogate and examine the operations such as read-write; Or need the time that required some antennas switching is artificially set.This artificial selection or the mode arranging antenna well can not adapt to applied environment, when needing when fixed reader there being antenna to add or remove, need the artificial connection understanding antenna to arrange again; When the number of tags in the corresponding scene of each antenna changes, setting before may not be just best.Multiple antennas in the present invention automatically switches and is detained the connection that self-learning method then can detect exterior antenna automatically, does not need human intervention just can set up preferably antenna switching scheme.
UHF RFID reader, due to the difference of the country of use, has multiple frequency range, and the frequency range that China commonly uses is between 920MHz to 925MHz.These frequency ranges are that step-length is divided into multiple frequency with 0.25MHz, but it is best for generally only having several frequency to read effect in actual use, frequency hopping point selection self-learning method of the present invention, namely be consider based on this point, select wherein several optimum and read frequency to do the use of frequency hopping point, thus improve reading efficiency.
The emissive power of read write line is a very important parameter.Read write line is to the operating distance of electronic tag, and mainly can be determined by this emissive power, emissive power is larger, then operating distance is far away.The emissive power of read write line can be adjusted by system parameter setting, can be divided into what or continuously adjustabe.But emissive power is too large, add power consumption on the one hand, then can cause larger electromagenetic wave radiation to surrounding environment on the other hand.Power adjustments self-learning method of the present invention is then intended to by some computation process, and Lookup protocol minimum power, interrogates and examines out all labels in environment.
Summary of the invention
Technical matters to be solved by this invention improves the reading efficiency of ultrahigh frequency readers.
For solving the problems of the technologies described above, the invention provides a kind of UHF RFID self-adaptation method of work, it is characterized in that, comprise multiple antennas automatic switchover and be detained self study process, specifically comprise the following steps:
11) the antenna hold-up time is with X millisecond for least unit, namely interrogates and examines the shortest time in cycle for one; Switch time that all antenna carries out interrogating and examining as a switching cycle;
12) each mobile radio hold-up time (in the hold-up time, antenna carries out interrogating and examining work)
Minimumly comprise N number of time slot, comprise at most M time slot, time slot refers to the gap in the time period that each antenna is interrogated and examined from start to end, and time slot length is relevant with the number of tags read in the process of interrogating and examining, so time slot length uncertain;
13) periodicity of self study process is carried out in external control, namely controls to switch the number of times carrying out self study again;
14) judged whether that antenna connects by the backward power of each antennal interface, set up antenna switching table, comprised mobile radio ID and the corresponding relation being detained timeslot number;
15) carry out label to interrogate and examine continuously, each antenna is detained T and interrogates and examines the cycle, the delay timeslot number that namely this antenna is corresponding in antenna switching table;
16) carry out self study process is S switching cycle at every turn, only before learning process starts, upgrades antenna switching table;
17) if do not interrogate and examine label in the given antenna hold-up time, then timeslot number subtracts 1, but minimum be N;
18) if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 120%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M1, if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 140%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M2, wherein M1<M2<=M; Label average interrogated and examined by described antenna is add up the number of tags that all antennas in a switching cycle are read, and then takes the mean to the number of tags that antennas all in multiple switching cycle are read;
19) if the number of tags that antenna hold-up time inner disc is found interrogates and examines 70% of label average lower than antenna, then timeslot number subtracts 1, and timeslot number is minimum is set to N1, N1>N, label can be read, but number of tags is less than 70% of label average;
20) step 17 is repeated)-19) carry out a self study M switching cycle, determine antenna switching table.
Aforesaid a kind of UHF RFID self-adaptation method of work, is characterized in that: also comprise frequency hopping point selection self study process, specifically comprise the following steps:
21) giving tacit consent to working frequency range is 920MHz-925MHz, selects frequency range by outside;
22) frequency increases step-length is 0.25MHz, sets up frequency hopping table;
23) interference of detection foreign frequency is carried out to frequencies all in frequency hopping table and whether exceed threshold value, if the foreign frequency interference that the frequency in frequency meter is corresponding exceedes threshold value corresponding to frequency, then this frequency is removed from frequency hopping table, revise the activity frequency points in frequency hopping table, the corresponding threshold value of frequency and frequency access times simultaneously, set up accurate activity frequency hopping Table A; 24) get all frequencies in accurate activity frequency hopping Table A and carry out tuner operation respectively;
25) at read range built-in day-mark label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, and placement parallel with reading antenna, generally arranges two;
26) all frequencies called successively in frequency hopping table carry out label and interrogate and examine, and this process is as a hop period;
27) interrogate and examine N number of hop period continuously, add up the number of tags that each frequency reads;
28) the frequency hopping Table A intermediate-frequeney point reading effect optimum is chosen, if reading tag effect retains all frequency hoppings point when identical, form accurate frequency hopping table B, read effect using the number of tags that can read as evaluation criteria, the number of tags read is more, represents that effect is better;
29) interrogate and examine M hop period continuously, add up signal intensity instruction (RSSI) mean value of the reception of each frequency reading tag in accurate frequency hopping table B;
210) contrast test, retains the frequency hopping point that RSSI value in accurate frequency hopping table is maximum, forms accurate frequency hopping table C;
211) the final frequency hopping table of the frequency hopping randomly ordered generation of table C intermediate-frequeney point is aimed at.
Aforesaid a kind of UHF RFID self-adaptation method of work, is characterized in that: also comprise power adjustments self study process, specifically comprise the following steps:
31) within the scope of expection read operation, install antenna and set up label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, placement parallel with reading antenna;
32) interrogate and examine the stage at read write line, first interrogate and examine continuously with peak power, obtain the number of tags A in maximum read range;
33) Modulating Power reduces 1dBm;
34) being a test period with N number of cycle of interrogating and examining, making the number of tags that reads and step 32) the number of tags A that detects is consistent;
35) repeat step 33), 34) operation, stop when number of tags that reader is interrogated and examined reduces;
36) current power added 1dBm and preserve, as minimum power;
37) continuous N time is interrogated and examined, and test its read stability, if namely can not read number of tags A more than M/3 time, so minimum power adds 1dBm and preserves;
38) if minimum power is the peak power that it can be arranged, then report to the police and point out, re-start astronomical cycle and return step 31).
The beneficial effect that the present invention reaches:
UHF RFID self-adaptation method of work based on AS3992 of the present invention, the robotization of work is confirmed after achieving multiple antennas fixed UHF RFID reader increase and decrease antenna, number of tags in time in scene residing for each antenna adjusts the antenna hold-up time automatically, can effectively improve multiple antennas switch situation of interrogating and examining continuously under reading efficiency.Achieve the object choosing several more excellent frequencies in used frequency range, utilize more excellent frequency to improve read-write efficiency.Can regulating power automatically, making reader meeting the situation decline low-power consumption of read-write operation, reducing the Radio frequency interference (RFI) to surrounding environment.
Accompanying drawing explanation
Fig. 1 is that label test board of the present invention arranges schematic diagram.
Embodiment
The present invention proposes 3 kinds of self study processes, reader can be made in use to have given play to good result of use.
The present invention to be correlated with self-study mechanism based on the rfid interrogator of AS3992 chip.Following explanation is done to 3 kinds of self-study mechanism main points below: comprise multiple antennas automatic switchover and be detained self study, the self study of frequency hopping point selection and power adjustments self study three processes,
(A) multiple antennas automatic switchover, time are detained self-study mechanism and comprise following main points:
11) the antenna hold-up time is with X millisecond for least unit, namely interrogates and examines the shortest time in cycle for one; Switch time that all antenna carries out interrogating and examining as a switching cycle;
12) each mobile radio hold-up time is (in the hold-up time, antenna carries out interrogating and examining work) minimumly comprise N number of time slot, comprise at most M time slot, time slot refers to the gap in the time period that each antenna is interrogated and examined from start to end, time slot length is relevant with the number of tags read in the process of interrogating and examining, so time slot length uncertain;
13) periodicity of self study process is carried out in external control, namely controls to switch the number of times carrying out self study again;
14) judged whether that antenna connects by the backward power of each antennal interface, set up antenna switching table, comprised mobile radio ID and the corresponding relation being detained timeslot number;
Antenna switching table is as shown in table 1.
Table 1
| Mobile radio ID | Be detained timeslot number |
| 0 | 3 |
| 1 | 3 |
| 2 | 3 |
| 3 | 3 |
15) carry out label to interrogate and examine continuously, each antenna is detained T and interrogates and examines the cycle, the delay timeslot number that namely this antenna is corresponding in antenna switching table;
16) carry out self study process is S switching cycle at every turn, only before learning process starts, upgrades antenna switching table;
17) if do not interrogate and examine label in the given antenna hold-up time, then timeslot number subtracts 1, but minimum be N;
18) if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 120%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M1, if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 140%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M2, wherein M1<M2<=M; Label average interrogated and examined by described antenna is add up the number of tags that all antennas in a switching cycle are read, and then takes the mean to the number of tags that antennas all in multiple switching cycle are read;
19) if the number of tags that antenna hold-up time inner disc is found interrogates and examines 70% of label average lower than antenna, then timeslot number subtracts 1, and timeslot number is minimum is set to N1, N1>N, label can be read, but number of tags is less than 70% of label average;
20) step 17 is repeated)-19) carry out a self study M switching cycle, determine antenna switching table.
This method confirms the robotization of work after achieving multiple antennas fixed UHF RFID reader increase and decrease antenna, number of tags in time in scene residing for each antenna adjusts the antenna hold-up time automatically, can effectively improve multiple antennas switch situation of interrogating and examining continuously under reading efficiency.
(B) frequency hopping point selection self-study mechanism comprises following main points:
21) giving tacit consent to working frequency range is 920MHz-925MHz, selects frequency range by outside;
22) frequency increases step-length is 0.25MHz, sets up frequency hopping table; Frequency hopping tabular form sample is as shown in table 2:
Table 2
23) interference of detection foreign frequency is carried out to frequencies all in frequency hopping table and whether exceed threshold value, if the foreign frequency interference that the frequency in frequency meter is corresponding exceedes threshold value corresponding to frequency, then this frequency is removed from frequency hopping table, revise the activity frequency points in frequency hopping table, the corresponding threshold value of frequency and frequency access times simultaneously, set up accurate activity frequency hopping Table A; Accurate activity frequency hopping Table A citing is as shown in table 3:
Table 3
24) get all frequencies in accurate activity frequency hopping Table A and carry out tuner operation respectively;
25) at read range built-in day-mark label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, and placement parallel with reading antenna, generally arranges two;
26) all frequencies called successively in frequency hopping table carry out label and interrogate and examine, and this process is as a hop period;
27) interrogate and examine N number of hop period continuously, add up the number of tags that each frequency reads;
28) the frequency hopping Table A intermediate-frequeney point reading effect optimum is chosen, if reading tag effect retains all frequency hoppings point when identical, form accurate frequency hopping table B, read effect using the number of tags that can read as evaluation criteria, the number of tags read is more, represents that effect is better;
29) interrogate and examine M hop period continuously, add up signal intensity instruction (RSSI) mean value of the reception of each frequency reading tag in accurate frequency hopping table B;
210) contrast test, retains the frequency hopping point that RSSI value in accurate frequency hopping table is maximum, forms accurate frequency hopping table C;
211) the final frequency hopping table of the frequency hopping randomly ordered generation of table C intermediate-frequeney point is aimed at.
This method achieves the object choosing several more excellent frequencies in used frequency range, utilizes more excellent frequency to improve read-write efficiency.
(C) power adjustments self-study mechanism comprises following main points:
31) within the scope of expection read operation, install antenna and set up label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, placement parallel with reading antenna;
32) interrogate and examine the stage at read write line, first interrogate and examine continuously with peak power, obtain the number of tags A in maximum read range;
33) Modulating Power reduces 1dBm;
34) being a test period with N number of cycle of interrogating and examining, making the number of tags that reads and step 32) the number of tags A that detects is consistent;
35) repeat step 33), 34) operation, stop when number of tags that reader is interrogated and examined reduces;
36) current power added 1dBm and preserve, as minimum power;
37) continuous N time is interrogated and examined, and test its read stability, if namely can not read number of tags A more than M/3 time, so minimum power adds 1dBm and preserves;
38) if minimum power is the peak power that it can be arranged, then report to the police and point out, re-start astronomical cycle and return step 31).
This method can regulating power automatically, making reader meeting the situation decline low-power consumption of read-write operation, reducing the Radio frequency interference (RFI) to surrounding environment.
The present invention is illustrated according to the preferred embodiment, should be appreciated that above-described embodiment does not limit the present invention in any form, the technical scheme that the form that all employings are equal to replacement or equivalent transformation obtains, and all drops within protection scope of the present invention.
Claims (3)
1. a UHF RFID self-adaptation method of work, is characterized in that, comprises multiple antennas automatic switchover and is detained self study process, specifically comprise the following steps:
11) the antenna hold-up time is with X millisecond for least unit, namely interrogates and examines the shortest time in cycle for one; Switch time that all antenna carries out interrogating and examining as a switching cycle;
12) each mobile radio hold-up time minimumly comprises N number of time slot, comprises at most M time slot, and time slot refers to the gap in the time period that each antenna is interrogated and examined from start to end;
13) periodicity of self study process is carried out in external control, namely controls to switch the number of times carrying out self study again;
14) judged whether that antenna connects by the backward power of each antennal interface, set up antenna switching table, comprised mobile radio ID and the corresponding relation being detained timeslot number;
15) carry out label to interrogate and examine continuously, each antenna is detained T and interrogates and examines the cycle, the delay timeslot number that namely this antenna is corresponding in antenna switching table;
16) carry out self study process is S switching cycle at every turn, only before learning process starts, upgrades antenna switching table;
17) if do not interrogate and examine label in the given antenna hold-up time, then timeslot number subtracts 1, but minimum be N;
18) if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 120%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M1, if the number of tags that antenna hold-up time inner disc is found exceed that label average interrogated and examined by antenna 140%, then timeslot number adds 1, and timeslot number is maximum is set to numerical value M2, wherein M1<M2<=M; Label average interrogated and examined by described antenna is add up the number of tags that all antennas in a switching cycle are read, and then takes the mean to the number of tags that antennas all in multiple switching cycle are read;
19) if the number of tags that antenna hold-up time inner disc is found interrogates and examines 70% of label average lower than antenna, then timeslot number subtracts 1, and timeslot number is minimum is set to N1, N1>N, label can be read, but number of tags is less than 70% of label average;
20) step 17 is repeated)-19) carry out a self study M switching cycle, determine antenna switching table.
2. a kind of UHF RFID self-adaptation method of work according to claim 1, is characterized in that: also comprise frequency hopping point selection self study process, specifically comprise the following steps:
21) giving tacit consent to working frequency range is 920MHz-925MHz, selects frequency range by outside;
22) frequency increases step-length is 0.25MHz, sets up frequency hopping table;
23) interference of detection foreign frequency is carried out to frequencies all in frequency hopping table and whether exceed threshold value, if the foreign frequency interference that the frequency in frequency meter is corresponding exceedes threshold value corresponding to frequency, then this frequency is removed from frequency hopping table, revise the activity frequency points in frequency hopping table, the corresponding threshold value of frequency and frequency access times simultaneously, set up accurate activity frequency hopping Table A;
24) get all frequencies in accurate activity frequency hopping Table A and carry out tuner operation respectively;
25) at read range built-in day-mark label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, placement parallel with reading antenna;
26) all frequencies called successively in frequency hopping table carry out label and interrogate and examine, and this process is as a hop period;
27) interrogate and examine N number of hop period continuously, add up the number of tags that each frequency reads;
28) the frequency hopping Table A intermediate-frequeney point reading effect optimum is chosen, if reading tag effect retains all frequency hoppings point when identical, form accurate frequency hopping table B, read effect using the number of tags that can read as evaluation criteria, the number of tags read is more, represents that effect is better;
29) interrogate and examine M hop period continuously, add up signal intensity instruction (RSSI) mean value of the reception of each frequency reading tag in accurate frequency hopping table B;
210) contrast test, retains the frequency hopping point that RSSI value in accurate frequency hopping table is maximum, forms accurate frequency hopping table C;
211) the final frequency hopping table of the frequency hopping randomly ordered generation of table C intermediate-frequeney point is aimed at.
3. a kind of UHF RFID self-adaptation method of work according to claim 1 and 2, is characterized in that: also comprise power adjustments self study process, specifically comprise the following steps:
31) within the scope of expection read operation, install antenna and set up label test environment, namely set up N number of UHF RFID label tag test board, N >=2, label test board is all placed on the dead ahead of reading antenna, placement parallel with reading antenna;
32) interrogate and examine the stage at read write line, first interrogate and examine continuously with peak power, obtain the number of tags A in maximum read range;
33) Modulating Power reduces 1dBm;
34) being a test period with N number of cycle of interrogating and examining, making the number of tags that reads and step 32) the number of tags A that detects is consistent;
35) repeat step 33), 34) operation, stop when number of tags that reader is interrogated and examined reduces;
36) current power added 1dBm and preserve, as minimum power;
37) continuous N time is interrogated and examined, if can not read number of tags A more than M/3 time, so minimum power adds 1dBm and preserves;
38) if minimum power is the peak power that can arrange, then report to the police and point out, re-start astronomical cycle and return step 31).
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| CN106778974A (en) * | 2016-12-21 | 2017-05-31 | 山东大学 | A kind of test device and its method of work of the intensive environmental performance of rfid system |
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| CN104931925A (en) * | 2015-06-05 | 2015-09-23 | 福建工程学院 | Self-adaptive method based on reference label RFID positioning |
| CN106778974A (en) * | 2016-12-21 | 2017-05-31 | 山东大学 | A kind of test device and its method of work of the intensive environmental performance of rfid system |
| CN107818281A (en) * | 2017-11-20 | 2018-03-20 | 深圳市鸿陆技术有限公司 | A kind of handhold RFID read write line and its control method |
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