CN102098117B - Method for detecting leakage cable based on reflected wave comprehensive performances - Google Patents
Method for detecting leakage cable based on reflected wave comprehensive performances Download PDFInfo
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- CN102098117B CN102098117B CN2010106186824A CN201010618682A CN102098117B CN 102098117 B CN102098117 B CN 102098117B CN 2010106186824 A CN2010106186824 A CN 2010106186824A CN 201010618682 A CN201010618682 A CN 201010618682A CN 102098117 B CN102098117 B CN 102098117B
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Abstract
The invention provides a method for detecting a leakage cable based on reflected wave comprehensive performances, suitable for the communication field. The method comprises the following steps: a radio covering apparatus is connected with the leakage cable via an antenna output port; the radio covering apparatus sends a work electromagnetic wave signal F to a distal end via the leakage cable; the radio covering apparatus receives reflecting signals generated by the leakage cable at a plurality of points; and the radio covering apparatus analyzes waveform, time delay and phase of a plurality of reflecting signals, and judges the working state of the leakage cable. The embodiment of the invention sends the electromagnetic wave signal via the radio covering apparatus, transmits the signal via the leakage cable, and receives the reflecting signals generated by the leakage cable. The working state of the leakage cable is judged by analyzing the reflecting signals. The detecting method does not need to add a detecting apparatus, does not need a distal end apparatus, and directly detects the state of the leakage cable. Furthermore, the method is low in cost, capable of fast determining the position at which the leakage cable goes wrong, and capable of greatly reducing the engineering maintenance cost.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of leakage cable detection method based on the reflected wave composite characteristic.
Background technology
At present, leak the cable checkout gear and is formed by two parts, namely leak cable and detect the near-end machine and leak cable and detect remote termination, and the near-end machine must install inserter, and leak the terminal installation of cable remote termination.Operation principle is from the radiofrequency signal of module emission output one constant power, through leaking the reception primary module that cable is transferred to the leakage cable detection module of the other end, obtains the leak operating state of cable by the loss value that calculates transmission course.
When adopting this leakage cable detection method, near-end machine and remote termination must be arranged, thus the complexity that whole direct discharging station is become, and far-end need be laid power line, cost height, plant maintenance complexity in addition.And existing leakage cable checkout equipment is made up of near-end machine and remote termination, and any one breaks down and all can cause equipment to work, the risk height.And existing leakage cable detection method can only detect the Lou loss of cable, can't determine to leak the particular location that cable goes wrong.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of the embodiment of the invention is to provide a kind of leakage cable detection method based on the reflected wave composite characteristic.
The embodiment of the invention is achieved in that a kind of leakage cable detection method based on the reflected wave composite characteristic, said method comprising the steps of:
Wireless coverage equipment connects the leakage cable through the antenna delivery outlet;
Wireless coverage equipment is by leaking cable to far-end emission working electromagnet ripple signal F;
Wireless coverage equipment receives and leaks the reflected signal that cable produces at a plurality of points;
Wireless coverage equipment is to waveform, the time delay of described a plurality of reflected signals, and phase place is analyzed, and judges leakage cable working status.
Further, described method also comprises:
According to formula
Calculate and leak the position D that cable occurs, described
Be the propagation velocity of electromagnetic wave signal F in leaking cable, t2 is propagation delay time, and described t2 is the poor of electromagnetic signals F and the time that receives reflected signal.
Further, described method also comprises:
According to formula Tloss=(P1-Pm)/2 calculating the loss that m orders, described P1 is for leaking the transmitting power that cable detects, and the dBm of unit, Pm are the reflection power that m order, and Tloss is the loss that leakage cable to the m is ordered.
Further, described method also comprises:
According to computing formula
Calculate phase place, described
Be the time-delay phase place,
Be relative phase, N is periodicity.
In an embodiment of the present invention, utilize wireless coverage equipment electromagnetic signals through leaking the cable transmission, receive the reflected signal that the leakage cable produces.By the analysis to reflected signal, judge the operating state of leaking cable.This detection method need not to increase checkout equipment, does not need remote equipment, directly detects the cable state that leaks.And cost is low, can determine to leak the cable position that goes wrong rapidly, significantly reduces the engineering maintenance expense.
Description of drawings
Fig. 1 is the implementing procedure figure based on the leakage cable detection method of reflected wave composite characteristic that the embodiment of the invention provides;
Fig. 2 is that the leakage cable that the embodiment of the invention provides detects schematic diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Consult Fig. 1,2, as follows based on the implementing procedure of the leakage cable detection method of reflected wave composite characteristic:
In step S101, wireless coverage equipment connects the leakage cable through the antenna delivery outlet.
In step S102, wireless coverage equipment is by leaking cable to far-end emission working electromagnet ripple signal F.
In step S103, wireless coverage equipment receives and leaks the reflected signal that cable produces at a plurality of points.
Owing to leak the characteristic of cable, can produce reflected signal at each point of leakage cable, be respectively reflected signal 1, reflected signal 2 is to reflected signal N.
In step S104, wireless coverage equipment is to waveform, the time delay of described a plurality of reflected signals, and phase place is analyzed, and judges leakage cable working status.
Except above-mentioned steps, leak the position that cable occurs for understanding, described method also comprises: according to formula
Calculate and leak the position D that cable occurs, described
Be the propagation velocity of electromagnetic wave signal F in leaking cable, t2 is propagation delay time, and described t2 is the poor of electromagnetic signals F and the time that receives reflected signal.
Except above-mentioned steps, for understanding the loss of each point, described method also comprises: according to formula Tloss=(P1-Pm)/2 calculate the loss that m are ordered, described P1 is for leaking the transmitting power that cable detects, the dBm of unit, Pm are the reflection power that m is ordered, and Tloss is for leaking the loss that cable to the m is ordered.In the present embodiment, m is less than or equal to N.
Except above-mentioned steps, in order to understand its phase place, described method also comprises: according to computing formula
Calculate phase place, described
Be the time-delay phase place,
Be relative phase, N is periodicity.
In sum, this detection method need not to increase any checkout equipment, does not need remote equipment, directly detects the cable state that leaks.And the reliability height can not produce harmful effect to system.And cost is low, can determine to leak the cable position that goes wrong rapidly, significantly reduces the engineering maintenance expense.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the leakage cable detection method based on the reflected wave composite characteristic is characterized in that, said method comprising the steps of:
Wireless coverage equipment connects the leakage cable through the antenna delivery outlet;
Wireless coverage equipment is by leaking cable to far-end emission working electromagnet ripple signal F;
Wireless coverage equipment receives and leaks the reflected signal that cable produces at a plurality of points;
Wireless coverage equipment is to waveform, the time delay of described a plurality of reflected signals, and phase place is analyzed, and judges leakage cable working status;
According to formula
Calculate and leak the position D that cable occurs, described
Be the propagation velocity of electromagnetic wave signal F in leaking cable, t2 is propagation delay time, and described t2 is the poor of electromagnetic signals F and the time that receives reflected signal.
2. method according to claim 1 is characterized in that, described method also comprises:
According to formula Tloss=(P1-Pm)/2 calculating the loss that m orders, described P1 is for leaking the transmitting power that cable detects, and the dBm of unit, Pm are the reflection power that m order, and Tloss is the loss that leakage cable to the m is ordered.
3. method according to claim 1 is characterized in that, described method also comprises:
According to computing formula
Calculate phase place, described
Be the time-delay phase place,
Be relative phase, N is periodicity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106186824A CN102098117B (en) | 2010-12-31 | 2010-12-31 | Method for detecting leakage cable based on reflected wave comprehensive performances |
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| CN2010106186824A CN102098117B (en) | 2010-12-31 | 2010-12-31 | Method for detecting leakage cable based on reflected wave comprehensive performances |
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| CN102098117A CN102098117A (en) | 2011-06-15 |
| CN102098117B true CN102098117B (en) | 2013-07-31 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103344880A (en) * | 2013-05-24 | 2013-10-09 | 南京泰通科技有限公司 | Leaky cable/antenna feeder real-time monitoring apparatus and working method thereof |
| CN103874116B (en) * | 2014-03-27 | 2018-09-25 | 京信通信系统（中国）有限公司 | The method of multisystem mixing platform and its detection leakage cable fault point |
| CN106771845B (en) * | 2015-11-19 | 2021-03-30 | 中兴通讯股份有限公司 | Method and device for determining distance between first reflection point and radio frequency unit |
| CN105486977A (en) * | 2015-11-24 | 2016-04-13 | 北京交控科技股份有限公司 | Fault detection system and method for leaky cables |
| CN108768457A (en) * | 2018-04-27 | 2018-11-06 | 广州杰赛科技股份有限公司 | Multi-system access platform leaks detection method, device and the leakage cable detecting system of cable |
| CN108768458B (en) * | 2018-04-27 | 2022-01-11 | 广州杰赛科技股份有限公司 | Method and device for detecting leaky cable of multi-system access platform and leaky cable detection system |
| CN108982970A (en) * | 2018-04-27 | 2018-12-11 | 广州杰赛科技股份有限公司 | Multi-system access platform leaks detection method, device and the leakage cable detection system of cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100361167C (en) * | 2006-02-17 | 2008-01-09 | 南京泰通科技有限公司 | Leakage cable working status monitoring system and its monitoring method |
| CN101877160B (en) * | 2009-04-30 | 2012-01-18 | 上海申达自动防范系统工程有限公司 | Leakage cable intrusion detector system |
| CN201523378U (en) * | 2009-10-23 | 2010-07-07 | 南京泰通电子科技有限公司 | Miniature embedded type leaking cable monitoring system |
| CN201616155U (en) * | 2009-12-03 | 2010-10-27 | 安信合创科技(北京)有限责任公司 | Perimeter intrusion detector of leakage cable |
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