CN203422469U - Displacement positioning system based on signal attenuation difference of leaky communication cable - Google Patents
Displacement positioning system based on signal attenuation difference of leaky communication cable Download PDFInfo
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- CN203422469U CN203422469U CN201320430599.3U CN201320430599U CN203422469U CN 203422469 U CN203422469 U CN 203422469U CN 201320430599 U CN201320430599 U CN 201320430599U CN 203422469 U CN203422469 U CN 203422469U
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Abstract
The utility model relates to a displacement positioning system based on the signal attenuation difference of a leaky communication cable. The displacement positioning system comprises an upper computer, a leaky communication cable L with a known length and a mobile station. The two ends of the leaky communication cable L are respectively connected with a first base station and a second base station. The mobile station moves along the leaky communication cable L and communicates with the first station and the second station through the leaky communication cable L, or the first base station and the second base station respectively at the two ends of the leaky communication cable L send radio frequency signals of equal signal strength, and the radio frequency signals are received by the mobile station. A same signal enters the leaky communication cable L and is transmitted to the two ends thereof to generate different attenuation values, and the precise distance between the mobile station and each base station is analyzed and calculated by making use of the characteristic in which the strength of received signals can be easily measured and the difference of the attenuation values is positively correlated with the transmission distance. Real-time precise positioning of a closed roadway is realized, installation of a card reader is completely avoided, the system is simplified, the workload of installation and later maintenance is reduced, and the stability of the system is improved.
Description
Technical field
The utility model relates to displacement sensing positioning field, especially a kind of displacement sensing positioning system based on radio-frequency leakage mechanics of communication.
Background technology
At present, traditional enclosing tunnel location positioning system overwhelming majority adopts on the circuit of location, each anchor point is installed radio-frequency card reader, and moving target carries radio frequency designation card, carries out gate inhibition's formula location in card reader range of signal, this type of location technology needs a large amount of card reader of installing, workload is large, and the maintenance workload in later stage is large, and system failure rate is high, overlay area is limited, and blind area is many.Chinese patent CN202614244U discloses a kind of displacement sensing positioning system and method based on leakage current communication cable radio-frequency communication technology, and this technology adopts round two leakage current communication cables to utilize the signal turnaround time to measure distance and realizes location.Though this technology can realize omnidistance accurately location, high to the crystal oscillator of movement station self and electric property requirement, cost is higher.
Summary of the invention
For above-mentioned problems of the prior art, the purpose of this utility model is to provide displacement of moving article positioning system in a kind of tunnel based on Leakage Cable Technology, it is without on the circuit of location, card reader being installed, being better than traditional card reader gate inhibition's locator meams, differ from again with coming and going two leakage current communication cables, utilize the power attenuation amount of radio signal transmission on leakage current communication cable to transmit on its fixed frequency cable the physical characteristics that attenuation coefficient is relevant with transmission range.Through relatively calculating the pad value at leakage current communication two ends, determine mobile station location information, system architecture is simple, technology realizes conveniently, stability is strong, positioning precision is high.
for achieving the above object, the utility model is taked following technical scheme: the displacement location system based on leakage current communication cable signal decay difference, the leakage current communication cable L and the movement station that comprise host computer, known length, the two ends of described leakage current communication cable L connect the first base station and the second base station, and described movement station moves along leakage current communication cable L; And by leakage current communication cable L and the first base station and the second base station radio-frequency communication, or by first base station at described leakage current communication cable L two ends and the radiofrequency signal of the second base station transmission same signal intensity, by movement station, received; Every two base stations and known length leakage current communication cable be L shaped becomes orientation and communication subelement, and described host computer is by communication cable or optical fiber and several subelement connecting communications.Described in several, subelement adopts connected in series or in parallel.
In described first and second base station and movement station, data processing chip and radio-frequency (RF) receiving and transmission module are all set, described data processing chip is connected with radio-frequency (RF) receiving and transmission module.
Described leakage current communication cable L slots or hole at a certain distance at radio frequency coaxial-cable screen layer, so that radiofrequency signal and extraneous by sewing the mutual communication of window on cable, leakage signal along cable direction according to the spacing distance of perforate, carry out continuous leakage current communication, or at interval of a segment distance leakage current communication.
The localization method of this displacement location system, comprises the following steps:
1), movement station moves and sends radiofrequency signal to leakage current communication cable L along leakage current communication cable L, radiofrequency signal enters after leakage current communication cable L at anchor point D place through Space Coupling, transmits and is received by both respectively to the first base station and second base station at cable two ends; The radiofrequency signal at the D place before transmitting to two ends on leakage current communication cable L is same signal and same signal intensity, radio-frequency (RF) signal strength when reaching the first base station with the second base station, because of the different generation differences of distance, is designated as respectively A(db) and B(db); System records its receiving and transmitting signal intensity level calculated difference by the first base station and the second base station;
2), because attenuation coefficient is certain, the transmission attenuation value of signal on same cable and the positive correlation of transmission length, long L is certain for cable, therefore the A(db namely of the difference the transmission attenuation value of radiofrequency signal from D to the first base station with from D to the second base station)-B(db), this difference is directly proportional to the difference of distance between the first base station, two ends and the second base station to anchor point D place, movement station place; System, by comparison and computing, is determined the position at D place, movement station place, realizes the location to movement station.
Further: in described step 2, to work as A(db)-B(db) the difference position that approaches 0, D approach cable intermediate point, movement station is 0 to distance difference between two ends; Work as A(db)-B(db) difference maximum, mobile station location is at the first base station end; Work as A(db)-B(db) difference negative minimum, mobile station location is at the second base station end; By calculating A(db)-B(db) difference and this radiofrequency signal ratio of transmitting attenuation coefficient on cable, system determines that anchor point D is apart from the difference of two ends base station distance, to determine the position of anchor point D.
System of the present utility model also can be sent the radiofrequency signal of same signal intensity by base station, two ends, by movement station, received and carried out signal strength difference calculating, is sent to system and host computer after in like manner obtaining positional information.
as shown from the above technical solution:the utility model has obvious advantage compared with the locator meams of card reader, can realize level and smooth location in real time completely, and exempt the installation of card reader completely, has simplified system, has reduced installation workload and later maintenance workload, has improved the stability of system.Compare with the disclosed technical scheme of CN202614244U, the utility model structure is simpler, system stability is strong, positioning precision is higher, more convenient, cost is lower.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present utility model;
Embodiment
As shown in Figure 1, system of the present utility model comprises leakage current communication cable L4 and the movement station 5 of host computer 1, known length, and leakage current communication cable L4 two ends connect the first base station 2 and the second base station 3, and movement station 5 moves along leakage current communication cable L4; And by leakage current communication cable L and the first base station 2 and the second base station 3 radio-frequency communications; Described the first base station and upper machine communication.
The first base station 2, the second base station 3 and interior data processing chip and the radio-frequency (RF) receiving and transmission module of all arranging of movement station 5, data processing chip and radio-frequency (RF) receiving and transmission module are electrically connected to.Leakage current communication cable L4 communication is passed through in movement station 5 and the first base station 2,3 of the second base stations, directly by space transmission communication.Every two base stations and a known length leakage current communication cable L4 form orientation and communication subelement, and host computer is by communication cable or optical fiber and some subelement connecting communications.Each subelement can be connected also can be in parallel, and the base station of host computer and subelement, by communication cable or optical fiber connecting communication, forms positioning communication system.
Described leakage current communication cable L is at radio frequency coaxial-cable screen layer fluting or hole or other shape windows at a certain distance, so that radiofrequency signal and extraneous by sewing the mutual communication of window on cable, leakage signal according to the spacing distance of perforate, can be that continuous leakage current communication can be also at interval of a segment distance leakage current communication along cable direction.
Movement station C between the first base station and the second base station moves along sewing cable L, at anchor point D place, it continues the first base station 2 and the second base station 3 transmission to two ends respectively to a radiofrequency signal f of the upper transmission of leakage current communication cable L4 after anchor point D place enters leakage current communication cable L4 through Space Coupling signal.If the first base station 2 and the second base station 3 are respectively A point and B point, while arriving so A and B point, received signal strength value is made as respectively A (db), B(db).Because the transmission attenuation coefficient (i.e. hundred meters pad values) of this radiofrequency signal on leakage current communication cable L4 is certain, the upper transmission of leakage current communication cable L4 pad value is directly proportional to transmission range.This signal enters cable backward two ends transmission and arrives the different pad value of A, B point generation through different distance, because this signal was same signal and same signal intensity before being coupled on cable, therefore only need measure received signal strength when relatively this signal arrives the first base station 2 and the second base station 3 and carry out comparison operation signal difference, the difference decaying on cable according to signal under similarity condition becomes positive correlation with its transmission range difference, can determine the position of movement station 5 place anchor point D, realize the communication location of system to movement station.Work as A(db)-B(db) the difference position that approaches 0, D approach cable intermediate point, it is 0 to distance difference between two ends; Work as A(db)-B(db) difference maximum, hold at A its position; Work as A(db)-B(db) difference minimum for negative, hold at B its position; Pass through A(db)-B(db) difference and this signal ratio of transmitting attenuation coefficient on cable, system can determine anchor point D apart from two ends apart from difference, with the position of determining that D is ordered, realize the displacement location of system to movement station.
The radiofrequency signal that the utility model also can send same signal intensity by the first base station and second base station at described leakage current communication cable L two ends, is received by movement station.Computing method roughly the same, do not repeat them here.
In a word, the utility model enters leakage current communication cable L by same signal and is transferred to two ends and produces different pad values, utilize its received signal strength easily to measure, its pad value difference and the positively related characteristic of transmission range, analysis meter is calculated the accurate distance between movement station and base station, realizes accurately locating in real time of enclosing tunnel, exempted the installation of card reader completely, simplify system, reduced installation workload and later maintenance workload, improved the stability of system.
Above are only embodiment of the present utility model, to one skilled in the art, the utility model has multiple change and variation.Allly within invention thought of the present utility model and principle, make any modification, be equal to replacement, improve etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. the displacement location system based on leakage current communication cable signal decay difference, it is characterized in that: this system comprises leakage current communication cable L and the movement station of host computer, known length, the two ends of described leakage current communication cable L connect the first base station and the second base station, and described movement station moves along leakage current communication cable L; And by leakage current communication cable L and the first base station and the second base station radio-frequency communication, or by first base station at described leakage current communication cable L two ends and the radiofrequency signal of the second base station transmission same signal intensity, by movement station, received; Every two base stations and known length leakage current communication cable be L shaped becomes orientation and communication subelement, and described host computer is by communication cable or optical fiber and several subelement connecting communications.
2. the displacement location system based on leakage current communication cable signal decay difference according to claim 1, is characterized in that: described in several, subelement adopts connected in series or in parallel.
3. the displacement location system based on leakage current communication cable signal decay difference according to claim 1, it is characterized in that: in described first and second base station and movement station, data processing chip and radio-frequency (RF) receiving and transmission module are all set, described data processing chip is connected with radio-frequency (RF) receiving and transmission module.
4. the displacement location system based on leakage current communication cable signal decay difference according to claim 1, it is characterized in that: described leakage current communication cable L slots or hole at a certain distance at radio frequency coaxial-cable screen layer, so that radiofrequency signal and extraneous by sewing the mutual communication of window on cable, leakage signal along cable direction according to the spacing distance of perforate, carry out continuous leakage current communication, or at interval of a segment distance leakage current communication.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320430599.3U CN203422469U (en) | 2013-07-19 | 2013-07-19 | Displacement positioning system based on signal attenuation difference of leaky communication cable |
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| CN201320430599.3U CN203422469U (en) | 2013-07-19 | 2013-07-19 | Displacement positioning system based on signal attenuation difference of leaky communication cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383447A (en) * | 2013-07-19 | 2013-11-06 | 童建伟 | Displacement positioning system based on leaky communication cable signal attenuation differences and positioning method of displacement positioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383447A (en) * | 2013-07-19 | 2013-11-06 | 童建伟 | Displacement positioning system based on leaky communication cable signal attenuation differences and positioning method of displacement positioning system |
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Granted publication date: 20140205 |