CN102137486B - A kind of navigation system based on WLAN (wireless local area network) - Google Patents
A kind of navigation system based on WLAN (wireless local area network) Download PDFInfo
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- CN102137486B CN102137486B CN201010568990.0A CN201010568990A CN102137486B CN 102137486 B CN102137486 B CN 102137486B CN 201010568990 A CN201010568990 A CN 201010568990A CN 102137486 B CN102137486 B CN 102137486B
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- localizer
- perimeter
- wireless local
- wlan
- area network
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Abstract
A kind of security positioning system based on WLAN (wireless local area network).Comprising, center base station (204), access point repeater (203), perimeter localizer (202-1,202-2,202-n) with secure localization terminal (201), it is characterized in that: described each perimeter localizer (202-1,202-2,, 202-n) be all connected with a leaky cable; Described secure localization terminal (201) and described perimeter localizer rely on 2.4G wireless local net mode to be connected; Between center base station (204) and access point repeater (203) and perimeter localizer (202-1,202-2,, 202-n) be also be connected by 2.4G wireless local net mode between access point repeater (203).
Description
Technical field
The present invention relates to the technical field of location, especially, relate to a kind of localization method based on WLAN (wireless local area network) and system.
Background technology
Transformer station is the main run unit of electric power system, transformer station needs the equipment maked an inspection tour to comprise: circuit breaker, disconnecting link, instrument transformer, bus, lightning arrester, master-control room etc., there is outdoor, high-tension feature, and due to the special applications status of electric power resource in society, its stable continuous firing is the primary goal of work of transformer substation.Because equipment has electrification in high voltage, so during maintenance to equipment, the safety precautions of maintainer becomes extremely important.
The present invention is intended to realize zone location effectively to maintainer, prevents to violate the rules entering the behavior of deathtrap in time, improves the safe class of work of transformer substation to greatest extent.Native system needs to be deployed in transformer station, and transformer station's facility of electric power system is generally positioned at city suburbs, and surrounding building, personnel are relatively less, and the tour equipment component related in scheme is placed in outdoor.
Along with the development of Wireless Network, increasing wireless local area network technology is gradually by large-area commercialization, the wherein ieee802.15.4 standard of AAEE's release, transmission rate is lower than 50kbps, belong to slow data transmission agreement, but because it has networking mode flexibly, simply cheap terminal structure, be widely used in family, factory, the Automated condtrol in warehouse, to safety, health care, the supervision of environment etc., the accurate location of goods and materials, to military operation, fire fighter's operation is commanded, manifest is upgraded automatically, stock is carried out to a lot of aspects such as real-time tracking.
In this project, because system has the features such as place of safety personnel are removable, border can set flexibly, can by the flexible networking feature of technology, random structure casual network as boundary of safe region, and utilizes its terminal whether to be in the judgment basis whether entering deathtrap in access point coverage as maintainer.System adopts wireless (802.15.4) technology, realize the location, safety zone of maintainer, when the maintainer of locating terminal safe to carry leaves arrival deathtrap, place of safety in violation of rules and regulations, locating access points obtains the information of this terminal by leakage type cable, through wireless base station access-in management software, realize the zone location of maintainer.
Fig. 1 is the topology diagram of wireless local area network (WLAN) system, and the leaky cable that perimeter localizer connects, when signal transmission, has the power loss of transmission, and along with the increase of leaky cable length, power loss will be larger; Therefore from the orientation away from perimeter localizer, the signal that perimeter localizer sends also will be less.Now when the staff of locating terminal safe to carry is by this orientation, secure localization terminal just may can not receive the order that perimeter localizer sends, also just the card number of self and state information can not be issued perimeter localizer, thus cause failing to report of staff orientation.
When the field intensity value of traditional thermometrically method environment is around different, not in addition compartment analysis.In the orientation that field intensity value is less, namely the command signal of reading secure localization terminal that sends of perimeter localizer is less, the probability that secure localization terminal receives reading order reduces greatly, thus causes secure localization terminal greatly to be reduced by the probability that this locality No. ID and state information return to perimeter localizer.Therefore adopt traditional thermometrically method to realize when environment field intensity values is less around and still can ensure that perimeter localizer receives the data of secure localization terminal.
The present invention proposes to solve Problems existing in said system just.
Summary of the invention
When the technical problem to be solved in the present invention is to provide a kind of received field intensity values difference of environment around, secure localization terminal adjusts the method for the frequency sending return code to perimeter localizer automatically according to measured field intensity value.
The timing of secure localization terminal reports No. ID, the machine and state information, and perimeter localizer receives the data of secure localization terminal from leaky cable.The packet of the locator comprising self that reports of perimeter localizer timing number, secure localization terminal number that wireless terminal reception module receives and card number.
When the field intensity value of environment is less, secure localization terminal receives the corresponding reduction of probability of transmitting base station signal, thus the probability making mobile terminal return code to reception base station reduces, and can not receive even the signal that mobile terminal sends at all.
The mobile terminal of native system can the field intensity value of real-time testing current environment, and when the field intensity value recorded is less, terminal can regulate frequency and the code stream of its own transmission signal automatically according to the size of field intensity value, realize Automatic adjusument.
Distance perimeter localizer is nearer, and the field intensity value of the passage 3 that secure localization terminal detects is larger, and distance perimeter localizer is far away, and the field intensity value detected by it is less.When the staff of safe wearing locating terminal moves in place of safety, the field intensity value detected by secure localization terminal also moves along with staff and changes.When the excessive velocities of staff's movement, through the less orientation of field intensity value, perimeter localizer may attend school the state information less than secure localization terminal, thus causes and Lou locate.
In the present system, we make secure localization terminal send the frequency of card number and state to perimeter localizer:
f
s＝k
0(P
r)
-1+k
1(5)
Wherein k
0, k
1for constant, and work as P
min≤ P
r≤ P
maxduring <, above-mentioned formula is effective, shown in Fig. 2.
In a particular application, P is worked as
rat the minimum value P of our setting
mintime following, the maximum frequency allowed with sequential is sent card number and state information by secure localization terminal; In like manner, P is worked as
rat the maximum P of our setting
maxtime above, secure localization terminal sends card number and state information by with minimum frequency; Because the computing done in formula (5) of simple controller will become complicated, here we are by P
rvalue be divided into several segment, as shown in Figure 2, when secure localization terminal receive field intensity value between (P1, P2) time, using the transmission frequency of f12 as secure localization terminal; When the field intensity value that secure localization terminal receives is between (P3, P4), using the transmission frequency of f34 as secure localization terminal.
Accompanying drawing explanation
Make an explanation to embodiment hereinafter with reference to accompanying drawing below, following example is only as a kind of example but not is intended to limit the present invention.In accompanying drawing:
Fig. 1 is the schematic diagram of the system topology of this patent practical application;
Fig. 2 is secure localization terminal reception intensity values and the graph of a relation sending frequency;
Fig. 3 is the structured flowchart of secure localization terminal inner;
Fig. 4 is the cut-away view of processor 1 module (301) in Fig. 3 secure localization terminal;
Fig. 5 is the structured flowchart of perimeter localizer inside;
Embodiment:
Safety zone navigation system comprises secure localization terminal, perimeter localizer, access point repeater and center base station four part.
Secure localization terminal inner comprises processor 1 (301), wireless receiving module 1 (302), wireless sending module 1 (303).In Fig. 3 and Fig. 5, wireless receiving module 1 (302) and the wireless sending module 1 (303) of secure localization terminal inner work in passage 1 and passage 2 respectively; The wireless receiving module 2 (502) of perimeter localizer inside and wireless sending module 2 (503), work in passage 2 and passage 1 respectively.
Perimeter localizer is sent the order of reading state to secure localization terminal with the timing frequency of timer 1 by leaky cable by wireless sending module 2 (503), data are delivered to processor 1 (301) after receiving read command by wireless receiving module 1 (302) by secure localization terminal.
In Fig. 4, data obtain the field intensity value of passage 1 by field strength measuring module (401), then this field intensity value is delivered to field intensity comparison module (402), and whether the field intensity value measured by judgement meets P
min≤ P
r≤ P
maxif field intensity value in above-mentioned scope, then can carry out calculating according to formula (5) thus obtain frequency value.If field intensity value is less than P
min, then we set frequency value is F
min.If field intensity value is greater than P
max, then we set frequency value is F
max.
Frequency value obtained above delivered to and send frequency controller (406), secure localization terminal sets the time interval of a transmission packet according to frequency value.
Using the timing T of the time interval obtained above as transmission timer module (407), when timing T then, secure localization terminal then starts wireless sending module 1 (303), and wireless sending module 1 (303) is arranged on passage 2, secure localization terminal No. ID and state information are sent to perimeter localizer.
Wherein, the relation of the timing T of frequency value and transmission timer module (407) can be described as, as frequency value P
rless, then timing T should be longer; Otherwise, as frequency value P
rlarger, then timing T should be shorter.Relation between the two can be determined with formula below:
T＝k
2*P
r -1(6)
Wherein, k
2for constant, can adjust according to actual conditions.
Illustrate below.Maximum field intensity values P can be set
maxbe 50, field minimum intensity values P
minbe 10, full locating terminal measured on passage 1 by wireless receiving module 1 (303) near the perimeter localizer of environment send the field intensity value of signal, obtain field intensity value; Then field intensity value is brought into formula (5) to calculate, obtain frequency value, then obtain timing by formula (6).
Although describe embodiments of the invention in detail by reference to the accompanying drawings above, it should be understood that execution mode described above is just for illustration of the present invention, and be not construed as limiting the invention.For a person skilled in the art, can various modifications and changes be made to above-mentioned execution mode and not deviate from the spirit and scope of the invention.Therefore, scope of the present invention is only limited by appended claim and equivalents thereof.
Claims (3)
1. the navigation system based on 2.4G WLAN (wireless local area network), comprise, secure localization terminal 201 and perimeter localizer 202-1, 202-2, 202-n, it is characterized in that: each perimeter localizer 202-1, 202-2, 202-n is connected with a leaky cable, multiple perimeter localizer 202-1, 202-2, 202-n forms an approximate closed route, namely perimeter localizer 202-2 is placed in the end of leaky cable that perimeter localizer 202-1 connects, perimeter localizer 202-3 is placed in the end of the leaky cable that perimeter localizer 202-2 connects, the rest may be inferred, composition needs the border in the region of location.
2. the navigation system based on 2.4G WLAN (wireless local area network) according to claim 1, also comprise access point repeater 203 and center base station 204, it is characterized in that: wherein secure localization terminal 201 and perimeter localizer 202-1,202-2,, the communication between 202-n is carried out at the passage 3 of 2.4G WLAN (wireless local area network);
Perimeter localizer 202-1,202-2 ..., the communication between 202-n and access point repeater 203 is carried out at the passage 2 of 2.4G WLAN (wireless local area network);
Communication between center base station 204 and access point repeater 203 is carried out at the passage 1 of 2.4G WLAN (wireless local area network).
3. the navigation system based on 2.4G WLAN (wireless local area network) according to claim 1, wherein
Secure localization terminal 201 can detect the field intensity value of current environment automatically, and the frequency sending card number and state to perimeter localizer 202-n of self is changed according to detected field intensity value, receive the card number that secure localization terminal 201 sends and state information to guarantee also to make to greatest extent when field intensity value is less perimeter localizer 202-n.
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| CN201010568990.0A CN102137486B (en) | 2010-12-02 | 2010-12-02 | A kind of navigation system based on WLAN (wireless local area network) |
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| CN102137486B true CN102137486B (en) | 2016-04-06 |
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| CN102438203B (en) * | 2011-09-13 | 2014-04-16 | 大连海事大学 | Device and algorithm for precisely locating mobile terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1873548A1 (en) * | 2006-06-30 | 2008-01-02 | NTT DoCoMo, Inc. | Position determination system and position determination method |
| CN101349744A (en) * | 2008-06-27 | 2009-01-21 | 重庆智溢科技有限公司 | Method and system for tracking and positioning downhole personnel based on Zigbee network platform |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1873548A1 (en) * | 2006-06-30 | 2008-01-02 | NTT DoCoMo, Inc. | Position determination system and position determination method |
| CN101349744A (en) * | 2008-06-27 | 2009-01-21 | 重庆智溢科技有限公司 | Method and system for tracking and positioning downhole personnel based on Zigbee network platform |
Non-Patent Citations (1)
| Title |
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| 基于ZigBee的井下人员跟踪定位系统设计与实现;马钢;《大连理工大学学位论文》;20090430;13-32 * |
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