CN101794491B - Mobile target wireless tracking and positioning electronic fence system and tracking and positioning method thereof - Google Patents
Mobile target wireless tracking and positioning electronic fence system and tracking and positioning method thereof Download PDFInfo
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- CN101794491B CN101794491B CN2010101064318A CN201010106431A CN101794491B CN 101794491 B CN101794491 B CN 101794491B CN 2010101064318 A CN2010101064318 A CN 2010101064318A CN 201010106431 A CN201010106431 A CN 201010106431A CN 101794491 B CN101794491 B CN 101794491B
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Abstract
The invention discloses a mobile target wireless tracking and positioning electronic fence system and a tracking and positioning method thereof; a monitoring device is connected with a plurality of interceptors through a first communication bus, and is connected with a plurality of dictographs through a second communication bus; a tracker is a device which tracks, positions and identifies a monitored object and is integrated with the monitored object; the tracker emits wireless electric signals to the interceptors and the dictographs, and the interceptors and the dictographs report the intercepted trackers and the status thereof to the monitoring center through the first and the second communication buses. The invention has reasonable structure, and realizes the tracking and the positioning of a moving target within a limited geographic scope of an electronic fence, abnormal monitoring of the moving target, and the positioning and the monitoring to the infringe of the moving target on the electronic fence.
Description
Technical field:
The present invention relates to a kind of electronic enclosure system and localization method thereof with radio tracking, location and warning.
Background technology:
Common in the market radio tracking positioning equipment is usually based on technology such as GPS, GSM and WCDMA; Has the bearing accuracy height; The advantage that the track and localization region is wide, but exist system complex cost height, the very much not portable band of volume, the short shortcoming of the big stand-by time of power consumption, target can't receive gps signal indoor moving in addition; There is not region covered can't use GSM and WCDMA in the mobile base station, so the said equipment and be not suitable for the radio tracking location in some specific cell territory.The detector of common in the market fence usually based on infrared ray block, principles such as pyroelectricity, wired shake-up, its shortcoming is that the infringement of animal can cause false alarm, and can't discern the objectives of invading fence.The detector of the wireless electron fence on the market still usually based on infrared ray block, principles such as pyroelectricity, wired shake-up, only adopt radio communication between detector and the Surveillance center.
Common radio tracking positioning system can only carry out track and localization to the moving target in certain region scope; There is not the border, target area to limit the monitoring positioning function of (being fence); And common fence can only receive fence and reporting to the police when invading; The electronics moving target in the fence is not carried out the zone location function, more can not discern concrete infringement target.
Present safety-protection system (like prison monitoring, important item storage monitoring, miner's search and rescue, the patient of hospital monitoring etc.) is mainly based on the video monitoring technology; Equipment investment is bigger; Cause omission because of the monitor staff is tired with carelessness easily when monitoring objective is a lot; And because the frequent false alarm of fence causes monitor staff's thought paralysis, thereby monitoring effect is reduced greatly.
Summary of the invention:
The object of the present invention is to provide a kind of rational in infrastructurely, have fence is limited mobile target wireless tracking positioning electronic fence system and the method for tracking and positioning thereof that moving target in the territorial scope carries out radio tracking, location and warning function.
Technical solution of the present invention is:
A kind of mobile target wireless tracking positioning electronic fence system; It is characterized in that: comprise Surveillance center; Surveillance center invades to intercept with several blockers of locating and is connected with carrying out the fence warning line through first communication bus, and Surveillance center is connected with several detectaphones that the tracker in the fence carried out track and localization through the second communication bus; Tracker is that monitored object is followed the tracks of, located and discerns, and the device that combines with monitored object, and first communication bus is used for all blockers are linked to each other with Surveillance center, and the passage of blocker and Surveillance center's data communication is provided; The second communication bus is used for all detectaphones are linked to each other with Surveillance center, and the passage of detectaphone and Surveillance center's data communication is provided; Tracker is to blocker and detectaphone transmitted radio signal, and blocker and detectaphone are reported through first, second communication bus tracker that listens to and state thereof to Surveillance center.
Surveillance center comprises the display terminal as the data of Surveillance center and state processing and demonstration; Display terminal be used for the database server of stored record system data and be connected; Display terminal is connected with the first communication bus interface circuit that is used for being connected first communication bus, make Surveillance center and blocker carry out data communication; Display terminal is connected with the second communication bus interface circuit that is used for being connected the second communication bus, make Surveillance center and detectaphone carry out data communication, and display terminal is connected with acousto-optic warning unit.
Blocker comprises the first microprocessor that carries out data processing; First microprocessor be used for carrying out the demodulation of radio reception; And be connected with first radio communication circuit that first microprocessor carries out exchanges data; First radio communication circuit is connected with first antenna that receives the tracker emitted radio signal; First microprocessor is connected with the third communication bus interface circuit that is used for being connected first communication bus, make first microprocessor and Surveillance center carry out data communication, and first microprocessor is connected with first data-carrier store that is used for storing the blocker numbering; A power converting circuit is above-mentioned first microprocessor, first radio communication circuit, third communication bus interface circuit and the power supply of first data-carrier store.
Detectaphone comprises second microprocessor that carries out data processing; Second microprocessor be used for carrying out the demodulation of radio reception; And be connected with second radio communication circuit that second microprocessor carries out exchanges data; Second radio communication circuit is connected with second antenna that receives the tracker emitted radio signal; Second microprocessor is connected with the four-way letter bus interface circuit that is used for being connected the second communication bus, make second microprocessor and Surveillance center carry out data communication, second microprocessor be used for storing second data-carrier store that detectaphone numbers and be connected; A power converting circuit is above-mentioned second microprocessor, second radio communication circuit, four-way letter bus interface circuit and the power supply of second data-carrier store.
Tracker comprises the 3rd microprocessor that carries out data processing; The 3rd microprocessor and the modulation and demodulation and the transmission power adjustment that are used for carrying out transceiving; And be connected with the 3rd radio communication circuit that the 3rd microprocessor carries out exchanges data; The 3rd radio communication circuit be used for carrying out carrier wave and detect with third antenna and be connected to detectaphone and blocker transmitted radio signal; The 3rd microprocessor is connected with the 3rd data-carrier store that is used for storing the tracker numbering; Whether under-voltage voltage detecting circuit is connected the 3rd microprocessor with detecting cell voltage, and whether the 3rd microprocessor is connected with the disengaging testing circuit of monitored object disengaging with the detection tracker, and the 3rd microprocessor is connected with the testing circuit of opening whether detection tracker shell is opened; Battery is above-mentioned the 3rd microprocessor, the 3rd radio communication circuit, the 3rd data-carrier store, voltage detecting circuit, disengaging testing circuit and opens the testing circuit power supply.
A kind of track and localization of mobile target wireless tracking positioning electronic fence system, warning, goal verification method is characterized in that: comprising:
(1) tracker combines with monitored object; Following monitored object moves with interior zone at fence; Each tracker stores unique numbering, and each detectaphone also stores unique numbering, and tracker is periodically randomly to the detectaphone transmitted radio signal; Detectaphone receives only tracker emitted radio signal, not transmitted radio signal; The carrier frequency that tracker is communicated by letter with detectaphone is different from the carrier frequency that tracker is communicated by letter with blocker, the emissive power of pre-set tracker when the detectaphone transmitted radio signal, thus limit the regional extent of intercepting of each detectaphone;
The regional extent of intercepting of each detectaphone has intersection, and at this moment, same tracker can be listened to by a plurality of adjacent detectaphones simultaneously, and Surveillance center listens to the detectaphone number of certain tracker through inspection, and track and localization is carried out in the tracker region; Intercept activity in the regional extent when certain emphasis tracker is limited at certain detectaphone, if this tracker leaves its affiliated zone of action, then the detectaphone under it is intercepted less than it; Surveillance center just reports to the police; If still in fence, then it will be listened to by other detectaphones this tracker, thereby Surveillance center just locks this tracker zone of living in; When all detectaphones did not all listen to certain tracker, Surveillance center reported to the police to it;
(2) each blocker stores unique numbering; The emissive power of pre-set tracker when the blocker transmitted radio signal; Thereby confirmed the warning distance of fence; Periodically at random to the blocker transmitted radio signal, blocker receives only tracker emitted radio signal, not transmitted radio signal to tracker;
The regional extent of intercepting of each blocker has intersection; At this moment; Same tracker can be listened to by a plurality of adjacent blockers simultaneously; Surveillance center listens to the blocker number of certain tracker through inspection, just tracker is invaded the fence region and positions and report to the police, and listens to this tracker numbering through blocker simultaneously and confirms concrete monitored object;
(3) tracker to the data of detectaphone and blocker emission except comprising the tracker numbering; Comprised also whether tracker is unusual; Be whether tracker breaks away from monitored object, whether the tracker shell is opened and status data that battery is whether under-voltage; Thereby Surveillance center can break away from monitored object and the tracker shell is opened and battery is under-voltage reports to the police to tracker, and number it is positioned according to the detectaphone that listens to this tracker.
The data length of tracker emission is very little, promptly launch time very short, each tracker is in dormant state before emission; The time span of each dormancy is at random, and when the dormancy end, at first the channel to detectaphone emission data carries out the carrier wave detection; Whether promptly detect channel idle, if channel idle, then to detectaphone emission data; If channel is not idle, wait for that then random time of time-delay is launched data to detectaphone after the channel idle;
Behind detectaphone emission ED, the channel of subtend blocker emission data carries out carrier wave and detects, and whether promptly detect this channel idle; If channel idle; Then to blocker emission data, if channel is not idle, then wait for channel idle after random time of time-delay launch data to blocker;
When behind blocker emission ED, extract a random time and get into rest period, so circulation.
Surveillance center obtains the interception data of detectaphone and blocker through communication bus order poll detectaphone and blocker.
Watch-dog also carries out the absent warning of emphasis tracker, the fence warning invaded by tracker and the absence of tracker universe is reported to the police; The absent warning of said emphasis tracker is meant that the emphasis tracker is broken away from certain detectaphone intercepts scope, promptly reports to the police during the radio signal of the overtime emphasis tracker that does not listen to required monitoring of certain detectaphone; Said tracker is invaded fence and is reported to the police and be meant when blocker receives the radio transmission signal of tracker and report to the police; Said tracker universe is absent reports to the police and reports to the police when being meant that whole detectaphones are all overtime and not listening to certain tracker.
Surveillance center can shield the tracker of appointment, promptly it is not monitored; Surveillance center can also set the emphasis tracker and it is limited the detectaphone signal that intercept the zone of action.
The present invention is rational in infrastructure, realizes the moving target that fence limits in the territorial scope is carried out track and localization, moving target abnormal monitoring and moving target is invaded fence positioning monitoring.The Radio Communication frequency range is open ISM (industry, science, medical treatment) frequency range or 2.4GHZ frequency range; Have with low cost, the little stand-by time length of power consumption, directional communication, antijamming capability is strong, electromagnetic pollution is little; Characteristics such as system constructing simple and flexible, the real-time of system, accuracy, reliability have been avoided many shortcomings of traditional safety-protection system effectively.
Description of drawings:
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Fig. 1 is that the structure of one embodiment of the invention is not expected.
Fig. 2 is the configuration diagram of Surveillance center.
Fig. 3 is the configuration diagram of blocker.
Fig. 4 is the configuration diagram of detectaphone.
Fig. 5 is the configuration diagram of tracker.
Embodiment:
A kind of mobile target wireless tracking positioning electronic fence system; Comprise Surveillance center 1 as the man-machine interface of system monitoring; Surveillance center invades to intercept with several blockers 2 of locating and is connected with carrying out the fence warning line through first communication bus 5, and Surveillance center is connected with several detectaphones 3 that the tracker in the fence carried out track and localization through second communication bus 6; Tracker 4 is that monitored object (target) is followed the tracks of, located and discerns; And be attached to monitored subject surface or embed device wherein; First communication bus 5 is used for all blockers are linked to each other with Surveillance center, and the passage of blocker and Surveillance center's data communication is provided; Second communication bus 6 is used for all detectaphones are linked to each other with Surveillance center, and the passage of detectaphone and Surveillance center's data communication is provided; Tracker is to blocker and detectaphone transmitted radio signal, and blocker and detectaphone are reported through first, second communication bus tracker that listens to and state thereof to Surveillance center.
Surveillance center comprises the display terminal 27 as the data of Surveillance center and state processing and demonstration; Display terminal be used for the database server 28 of stored record system data and be connected; Display terminal is connected with the first communication bus interface circuit 29 that is used for being connected first communication bus, make Surveillance center and blocker carry out data communication; Display terminal is connected with the second communication bus interface circuit 30 that is used for being connected the second communication bus, make Surveillance center and detectaphone carry out data communication, and display terminal is connected with acousto-optic warning unit 31.
Blocker comprises the first microprocessor 7 that carries out data processing; First microprocessor be used for carrying out the demodulation of radio reception; And be connected with first radio communication circuit 8 that first microprocessor carries out exchanges data; First radio communication circuit is connected with first antenna 9 that receives the tracker emitted radio signal; First microprocessor is connected with the third communication bus interface circuit 10 that is used for being connected first communication bus, make first microprocessor and Surveillance center carry out data communication, and first microprocessor is connected with first data-carrier store 11 that is used for storing the blocker numbering; A power converting circuit 12 is above-mentioned first microprocessor, first radio communication circuit, third communication bus interface circuit and the power supply of first data-carrier store.
Detectaphone comprises second microprocessor 13 that carries out data processing; Second microprocessor be used for carrying out the demodulation of radio reception; And be connected with second radio communication circuit 14 that second microprocessor carries out exchanges data; Second radio communication circuit is connected with second antenna 15 that receives the tracker emitted radio signal; Second microprocessor is connected with the four-way letter bus interface circuit 16 that is used for being connected the second communication bus, make second microprocessor and Surveillance center carry out data communication, second microprocessor be used for storing second data-carrier store 17 that detectaphone numbers and be connected; A power converting circuit 18 is above-mentioned second microprocessor, second radio communication circuit, four-way letter bus interface circuit and the power supply of second data-carrier store.
Tracker comprises the 3rd microprocessor 19 that carries out data processing; The 3rd microprocessor and the modulation and demodulation and the transmission power adjustment that are used for carrying out transceiving; And be connected with the 3rd radio communication circuit 20 that the 3rd microprocessor carries out exchanges data; The 3rd radio communication circuit be used for carrying out carrier wave and detect with third antenna 21 and be connected to detectaphone and blocker transmitted radio signal; The 3rd microprocessor is connected with the 3rd data-carrier store 22 that is used for storing the tracker numbering; Whether under-voltage voltage detecting circuit 23 is connected the 3rd microprocessor with detecting cell voltage, and whether the 3rd microprocessor is connected with the disengaging testing circuit 24 of monitored object disengaging with the detection tracker, and the 3rd microprocessor is connected with the testing circuit 25 of opening whether detection tracker shell is opened; Battery 26 is for above-mentioned the 3rd microprocessor, the 3rd radio communication circuit, the 3rd data-carrier store, voltage detecting circuit, disengaging testing circuit and open the testing circuit power supply.
A kind of track and localization of mobile target wireless tracking positioning electronic fence system, warning, goal verification method comprise:
(1) tracker combines with monitored object; Following monitored object moves with interior zone at fence; Each tracker stores unique numbering, and each detectaphone also stores unique numbering, and tracker is periodically randomly to the detectaphone transmitted radio signal; Detectaphone receives only tracker emitted radio signal, not transmitted radio signal; The carrier frequency that tracker is communicated by letter with detectaphone is different from the carrier frequency that tracker is communicated by letter with blocker, the emissive power of pre-set tracker when the detectaphone transmitted radio signal, thus limit the regional extent of intercepting of each detectaphone;
The regional extent of intercepting of each detectaphone has intersection, and at this moment, same tracker can be listened to by a plurality of adjacent detectaphones simultaneously, and Surveillance center listens to the detectaphone number of certain tracker through inspection, and track and localization is carried out in the tracker region; Intercept activity in the regional extent when certain emphasis tracker is limited at certain detectaphone, if this tracker leaves its affiliated zone of action, then the detectaphone under it is intercepted less than it; Surveillance center just reports to the police; If still in fence, then it will be listened to by other detectaphones this tracker, thereby Surveillance center just locks this tracker zone of living in; When all detectaphones did not all listen to certain tracker, Surveillance center reported to the police to it;
(2) each blocker stores unique numbering; The emissive power of pre-set tracker when the blocker transmitted radio signal; Thereby confirmed the warning distance of fence; Periodically at random to the blocker transmitted radio signal, blocker receives only tracker emitted radio signal, not transmitted radio signal to tracker;
The regional extent of intercepting of each blocker has intersection; At this moment; Same tracker can be listened to by a plurality of adjacent blockers simultaneously; Surveillance center listens to the blocker number of certain tracker through inspection, just tracker is invaded the fence region and positions and report to the police, and listens to this tracker numbering through blocker simultaneously and confirms concrete monitored object;
(3) tracker to the data of detectaphone and blocker emission except comprising the tracker numbering; Comprised also whether tracker is unusual; Be whether tracker breaks away from monitored object, whether the tracker shell is opened and status data that battery is whether under-voltage; Thereby Surveillance center can break away from monitored object and the tracker shell is opened and battery is under-voltage reports to the police to tracker, and number it is positioned according to the detectaphone that listens to this tracker.
The data length of tracker emission is very little, promptly launch time very short, each tracker is in dormant state before emission; The time span of each dormancy is at random, and when the dormancy end, at first the channel to detectaphone emission data carries out the carrier wave detection; Whether promptly detect channel idle, if channel idle, then to detectaphone emission data; If channel is not idle, wait for that then random time of time-delay is launched data to detectaphone after the channel idle;
Behind detectaphone emission ED, the channel of subtend blocker emission data carries out carrier wave and detects, and whether promptly detect this channel idle; If channel idle; Then to blocker emission data, if channel is not idle, then wait for channel idle after random time of time-delay launch data to blocker;
When behind blocker emission ED, extract a random time and get into rest period, so circulation.
Surveillance center obtains the interception data of detectaphone and blocker through communication bus order poll detectaphone and blocker.
Watch-dog also carries out the absent warning of emphasis tracker, the fence warning invaded by tracker and the absence of tracker universe is reported to the police; The absent warning of said emphasis tracker is meant that the emphasis tracker is broken away from certain detectaphone intercepts scope, promptly reports to the police during the radio signal of the overtime emphasis tracker that does not listen to required monitoring of certain detectaphone; Said tracker is invaded fence and is reported to the police and be meant when blocker receives the radio transmission signal of tracker and report to the police; Said tracker universe is absent reports to the police and reports to the police when being meant that whole detectaphones are all overtime and not listening to certain tracker.
Surveillance center can shield the tracker of appointment, promptly it is not monitored; Surveillance center can also set the emphasis tracker and it is limited the detectaphone signal that intercept the zone of action.
Claims (4)
1. the track and localization of a mobile target wireless tracking positioning electronic fence system, warning, goal verification method; Said radio tracking positioning electronic fence system comprises Surveillance center; Surveillance center invades to intercept with several blockers of locating and is connected with carrying out the fence warning line through first communication bus, and Surveillance center is connected with several detectaphones that the tracker in the fence carried out track and localization through the second communication bus; Tracker is that monitored object is followed the tracks of, located and discerns, and the device that combines with monitored object, and first communication bus is used for all blockers are linked to each other with Surveillance center, and the passage of blocker and Surveillance center's data communication is provided; The second communication bus is used for all detectaphones are linked to each other with Surveillance center, and the passage of detectaphone and Surveillance center's data communication is provided; Tracker is to blocker and detectaphone transmitted radio signal, and blocker and detectaphone are reported through first, second communication bus tracker that listens to and state thereof to Surveillance center; It is characterized in that: this method comprises:
(1) tracker combines with monitored object; Following monitored object moves with interior zone at fence; Each tracker stores unique numbering, and each detectaphone also stores unique numbering, and tracker is periodically randomly to the detectaphone transmitted radio signal; Detectaphone receives only tracker emitted radio signal, not transmitted radio signal; The carrier frequency that tracker is communicated by letter with detectaphone is different from the carrier frequency that tracker is communicated by letter with blocker, the emissive power of pre-set tracker when the detectaphone transmitted radio signal, thus limit the regional extent of intercepting of each detectaphone;
During the intercepting regional extent and exist to intersect of each detectaphone, same tracker can be listened to by a plurality of adjacent detectaphones simultaneously, and Surveillance center listens to the detectaphone number of certain tracker through inspection, and track and localization is carried out in the tracker region; Intercept activity in the regional extent when certain emphasis tracker is limited at certain detectaphone, if this emphasis tracker leaves its affiliated zone of action, then the detectaphone under it is intercepted less than it; Surveillance center just reports to the police; If still in fence, then it will be listened to by other detectaphones this emphasis tracker, thereby Surveillance center just locks this tracker zone of living in; When all detectaphones did not all listen to certain tracker, Surveillance center reported to the police to it;
(2) each blocker stores unique numbering; The emissive power of pre-set tracker when the blocker transmitted radio signal; Thereby confirmed the warning distance of fence; Periodically at random to the blocker transmitted radio signal, blocker receives only tracker emitted radio signal, not transmitted radio signal to tracker;
The regional extent of intercepting of each blocker exists when intersecting; Same tracker can be listened to by a plurality of adjacent blockers simultaneously; Surveillance center listens to the blocker number of certain tracker through inspection; Just tracker is invaded the fence region and position and report to the police, listen to this tracker numbering through blocker simultaneously and confirm concrete monitored object;
(3) tracker to the data of detectaphone and blocker emission except comprising the tracker numbering; Comprised also whether tracker is unusual; Be whether tracker breaks away from monitored object, whether the tracker shell is opened and status data that battery is whether under-voltage; Thereby Surveillance center can break away from monitored object and the tracker shell is opened and battery is under-voltage reports to the police to tracker, and number it is positioned according to the detectaphone that listens to this tracker.
2. the track and localization of mobile target wireless tracking positioning electronic fence system according to claim 1, warning, goal verification method is characterized in that: Surveillance center obtains the interception data of detectaphone and blocker through first communication bus and second communication bus order poll detectaphone and blocker.
3. the track and localization of mobile target wireless tracking positioning electronic fence system according to claim 1, warning, goal verification method is characterized in that: watch-dog also carries out the absent warning of emphasis tracker, the fence warning invaded by tracker and the absence of tracker universe is reported to the police; The absent warning of said emphasis tracker is meant that the emphasis tracker is broken away from certain detectaphone intercepts scope, promptly reports to the police during the radio signal of the overtime emphasis tracker that does not listen to required monitoring of certain detectaphone; Said tracker is invaded fence and is reported to the police and be meant when blocker receives the radio transmission signal of tracker and report to the police; Said tracker universe is absent reports to the police and reports to the police when being meant that whole detectaphones are all overtime and not listening to certain tracker.
4. the track and localization of mobile target wireless tracking positioning electronic fence system according to claim 1, warning, goal verification method is characterized in that: Surveillance center can shield the tracker of appointment, promptly it is not monitored; Surveillance center can also set the emphasis tracker and it is limited the detectaphone signal that intercept the zone of action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064318A CN101794491B (en) | 2010-01-20 | 2010-01-20 | Mobile target wireless tracking and positioning electronic fence system and tracking and positioning method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064318A CN101794491B (en) | 2010-01-20 | 2010-01-20 | Mobile target wireless tracking and positioning electronic fence system and tracking and positioning method thereof |
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| Publication Number | Publication Date |
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| CN101794491A CN101794491A (en) | 2010-08-04 |
| CN101794491B true CN101794491B (en) | 2012-06-20 |
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| CN2010101064318A Expired - Fee Related CN101794491B (en) | 2010-01-20 | 2010-01-20 | Mobile target wireless tracking and positioning electronic fence system and tracking and positioning method thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102799914B (en) * | 2012-07-16 | 2015-04-29 | 深圳市翌日科技有限公司 | Warehouse management system based on wireless positioning |
| US20170086202A1 (en) * | 2015-09-21 | 2017-03-23 | Qualcomm Incorporated | Wi-fi indoor radar |
| CN108769916A (en) * | 2018-04-03 | 2018-11-06 | 厦门华方软件科技有限公司 | A kind of electronic enclosure system and its implementation |
| CN108551655A (en) * | 2018-04-28 | 2018-09-18 | 中南大学湘雅医院 | Tent hospital camp and personnel safety monitoring system |
| CN111930736B (en) * | 2020-09-25 | 2021-06-01 | 深圳市天维大数据技术有限公司 | Data verification method and device |
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