CN106712873A - Leaky coaxial cable detection system and leaky coaxial cable detection method - Google Patents
Leaky coaxial cable detection system and leaky coaxial cable detection method Download PDFInfo
- Publication number
- CN106712873A CN106712873A CN201710050055.7A CN201710050055A CN106712873A CN 106712873 A CN106712873 A CN 106712873A CN 201710050055 A CN201710050055 A CN 201710050055A CN 106712873 A CN106712873 A CN 106712873A
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- signal
- tdr
- poi
- cable detection
- electric bridge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/354—Adjacent channel leakage power
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention provides a leaky coaxial cable detection system and a leaky coaxial cable detection method. The leaky coaxial cable detection system is connected between a plurality of access systems and leaky coaxial cables and comprises a first POI combiner and a second POI combiner, first TDR equipment and second TDR equipment which are correspondingly connected to the first POI combiner and the second POI combiner, and a bridge, wherein input ends of the first POI combiner and the second POI combiner are connected to the access systems and the corresponding first and second TDR equipment while output ends of the first POI combiner and the second POI combiner are respectively correspondingly connected to the inputs end of the bridge, and the output ends of the bridge are connected to the leaky coaxial cables. According to the leaky coaxial cable detection system and the leaky coaxial cable detection method, the technical effects of reducing the number of equipment of the system, the cost and the insertion loss, simplifying operating steps and easily detecting and checking a fault location condition of the leaky coaxial cable are realized.
Description
Technical field
The present invention relates to moving communicating field, more particularly, to one kind leakage cable detection system and leakage cable detection method.
Background technology
With the construction of high ferro and subway, the mobile communication covering scene of railway is more and more, and high ferro and subway landform are special
Property be applicable leakage cable covering, add operator and communication standard be more, POI (POINT OF INTERFACE, multisystem mixing put down
Platform) plus the covering scheme of cable is leaked into present main flow, for the ease of the fault location in tunnel, TDR (Time-Domain
Reflectometry, time domain reflection technology) just it has been integrated into POI monitoring.
As shown in figure 1, traditional TDR equipment is accessed in POI because POI and antenna feeder craft port be multichannel (usually
2 tunnels or 4 tunnels), it is every to be required for a TDR equipment, the antenna feeder port connection antenna feeder compartment system of POI all the way, that is, cable is leaked, often
All containing the signal covered the need for all in one leakage cable, and TDR equipment is " one visiting all the way ", if mixing can not be differentiated
Failure occurs at which, so TDR equipment can only be disposed close to the position of Lou cable, the frequency band of TDR equipment is usually chosen in
Beyond mobile band, when rear class is placed on, its detectable signal needs a combiner to be transmitted in accessing leakage cable, and increases
After combiner, Insertion Loss increases, cost increases, and cascade increases one-level and causes that the standing wave of covering signal deteriorates.
The content of the invention
Primary and foremost purpose of the invention aims to provide a kind of leakage cable detection system, and TDR equipment is placed in the input of POI combiners
End, eliminates traditional rear class combiner, the reduction of POI Insertion Loss, cost reduction, volume reduction, standing wave is easier debugging.
Another object of the present invention is to provide the leakage cable detection method that a kind of above-mentioned leakage cable detection system is implemented, TDR
TDR detecting devices is needed during detectable signal accesses POI combiners, with traditional leakage cable detection system with the signal of multiple access system
The technical scheme for accessing rear class combiner is compared, and the method reduce the quantity of TDR detectable signals, easily detection and investigation leakage
Cable fault location situation.
To achieve these goals, the present invention provides following technical scheme：
One kind leakage cable detection system, is connected between multiple access systems and leakage cable, including a POI combiners and second
The first TDR equipment and the 2nd TDR equipment of POI combiners connection corresponding with a POI combiners and the 2nd POI combiners
And electric bridge；The input of the first, second POI combiners and multiple access systems and corresponding first, second TDR equipment
Connection, while first, second POI combiners output end connection corresponding with the input of the electric bridge, the electric bridge respectively
Output end be used for leakage cable be connected.
Preferably, a TDR equipment and the signal band of the 2nd TDR equipment output are less than 698M Hz.
The invention provides one kind leakage cable detection system, TDR detectable signals access POI and close with the signal of multiple access system
Road device, compared with TDR detecting devices in traditional leakage cable detection system needs the technical scheme for accessing rear class combiner, the system
Reduce the quantity of equipment, reach POI Insertion Loss reduce, cost reduction, volume reduce, standing wave be easier debugging technique effect.
In addition, further relating to a kind of leakage cable detection method, using above-mentioned leakage cable detection system, comprise the following steps：By multiple
The signal of access system is divided into two groups, the signal of two groups of access systems and the detectable signal of a TDR equipment and the 2nd TDR equipment
One-to-one corresponding is combined, and forms the first combining signal and the second combining signal；The first combining signal and the second combining are believed
Number by after electric bridge combining again to leakage cable export.
Preferably, the signal band that a TDR equipment and the 2nd TDR equipment are exported is controlled in below 698M Hz.
Preferably, an input of the adjustment electric bridge two loss parameters respectively between two output ends, make described two losses
The absolute value of the difference of the amplitude output signal of parameter the first TDR equipment of correspondence or the 2nd TDR equipment is more than 18dB.
Preferably, two loss parameters of the input of the adjustment electric bridge respectively between two output ends refer to
It is to make the exhausted of described two differences being lost between parameters by adjusting the coefficient of coup m values of the two of the electric bridge loss parameters
18dB is more than to value.
Compared to existing technology, the solution of the present invention has advantages below：
The invention provides one kind leakage cable detection system and method, TDR detectable signals are directly closed with signal of communication
Road, changing conventional method TDR detectable signals needs the way of rear class combining, reduces operating procedure, improves reliability, reaches
Easily detection and investigation leak the technique effect of cable fault location situation.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 is the circuit block diagram of existing leakage cable detection system；
Fig. 2 is the circuit block diagram of leakage cable detection system of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not construed as limiting the claims.
As shown in Fig. 2 it is an object of the present invention to provide one kind leakage cable detection system 100, the input and output end of the system
Multiple access systems 200 and leakage cable 300 are connected respectively, and the system 100 includes two POI combiners, is respectively a POI combinings
The POI combiners 112 of device 111 and the 2nd, and multiple access systems 200 include the first access system collection 201 and the second access system
Collection 202, the first, second POI combiners 111,112 are respectively connected to first, second access system collection 201,202.Described
First, the number of the access system that the second access system collection 201,202 is connected, frequency band are identical or different.In the present embodiment, such as
Shown in Fig. 2, a POI combiners 111 and the 2nd POI combiners 112 connect N number of access system (N are whole more than 0 respectively
Number).Meanwhile, the input of first, second POI combiners 111,112 is corresponding with first, second TDR equipment 121,122 respectively to be connected
Connect, with by 112 pairs of the first access system collection 201 of a POI combiners 111 and the 2nd POI combiners and the second access system
The detectable signal combining of the signal and a TDR equipment 121 and the 2nd TDR equipment 122 of collection 202, forms the first combining letter respectively
Numbers 141 and the second combining signal 142.The first combining signal 141 and the second combining signal 142 by the combining of electric bridge 130 again
Exported to leakage cable 300.
The electric bridge 130 include four interfaces S1, S2, S3, S4, wherein S1, S2 respectively with a POI combiners 111 and
2nd POI combiners 112 are connected, and S3, S4 are connected with the first leakage leakage cable 302 of cable 301 and second.
The free transmission range of the first access system collection 201 and the second access system collection 202 is general 698MHz-2690MHz's
Within the scope of, the loss value of loss parameter S31 and S41 in the passband between the port of electric bridge 130 is identical, and energy distribution is
Approximately divide equally, 50%, i.e., traditional 3dB electric bridge characteristics are accounted for per road.But, outside the passband less than 698M Hz be not as
This, because now not controlling and each parameter of electric bridge without rule, after manual control band outer parameter, S41 and S31 especially
Characteristic become big in the outer passband difference of band.Specifically, the detectable signal output band of a TDR equipment 121 is less than 698M
Hz, the coefficient of coup m values of S41 and S31 by adjusting electric bridge 130, makes S41 different with the loss of S31, makes outside a certain passband
The absolute value of the difference of the coupling degree of unbalancedness of (i.e. less than 698M Hz), i.e. (generally take 20dB when | S31-S41 | is more than 18dB
More than) when, you can think that S41 paths do not produce influence on the signal of S31 paths, a TDR equipment 121 is only entered to leakage cable 301
Row breakdown judge, because -18dB is equivalent to standing wave 1.3；The standing wave thresholding for leaking cable breakdown judge is greater than 1.5, equivalent to-
14dB, in practical engineering application, leakage cable judges that standing wave is 3, equivalent to echo -6dB.Using 200MHz as detection frequency explanation：
The signal output frequency of TDR equipment is now adjusted, its tranmitting frequency is in 200MHz, while being allowed to by adjusting electric bridge 130
Amplitude imbalance in 200MHz reaches 20dB, now loss of the detectable signal of a TDR equipment 121 in electric bridge 130
Parameter S31 about -0.5dB, the loss parameter S41 of the detectable signal of a TDR equipment 121 in electric bridge 130 is less than -20dB, S41
Influence relative to S31 is in negligible state, it is believed that the signal of a TDR equipment 121 has entered into the first leakage cable 301
In, the first leakage cable 301 is detected.Similarly, the detectable signal of the 2nd TDR equipment 122 is by entering leakage cable after electric bridge 130
In, it is believed that only the second leakage cable 302 is monitored.If certain leaks cable and breaks down all the way, the TDR for accessing its road leakage cable sets
Standby detectable signal can feed back to the TDR equipment for sending the detectable signal, so as to readily appreciate which leakage cable breaks down,
No longer need rear class combiner.
The leakage cable detection system that the present invention is provided, by changing the low frequency characteristic of bridge, reduces mixed outside communication band
Frequency ability, makes system to access rear class combiner.Common combiner design Insertion Loss is of the invention in 0.5dB or so
Design reduces the part, covering leakage about hundred meters of 2dB of cable, so the change of 0.5dB is lifted equivalent to by coverage distance
25%.The leakage cable detection system that the present invention is provided eliminates traditional rear class combiner, has reached the reduction of POI Insertion Loss, cost
Reduction, volume reduction, standing wave are easier the technique effect debugged.
The present invention also provides a kind of leakage cable detection method with above-mentioned leakage cable detection system 100, first, by input leakage cable
The access system of detection system 100 is bisected into two groups, that is, the signal of access system 200 is divided into two groups, respectively with a TDR
The detectable signal of equipment is combined, and is correspondingly formed the first combining signal 141 and the second combining signal 142.Then, by described
One combining signal 141 and the second combining signal 142 to leakage cable 300 after the combining of electric bridge 130 by exporting.
The signal output frequency band of the first TDR equipment 121 is set as the free transmission range less than access system 200, that is, is controlled
Below 698MHz, controlling loss the parameter S31 and S41 of electric bridge 130 makes its characteristic difference become big, now a certain below 698M Hz
The coupling degree of unbalancedness of signal is increased.
Specifically, by adjusting the coefficient of coup m values of the S31 and S41 of electric bridge 130, make S31 different with the loss of S41.When
(more than 20dB is generally taken when the absolute value of the difference of degree of unbalancedness, i.e. | S31-S41 | are more than 18dB), you can think S41 paths
Influence is not produced on the signal of S31 paths, a TDR equipment 121 only carries out breakdown judge to leakage cable 301.Wherein, -18dB phases
When in standing wave 1.3, the standing wave thresholding for leaking cable breakdown judge is greater than 1.5, equivalent to -14dB, in practical engineering application, leakage cable is sentenced
It is 3 to determine standing wave, equivalent to echo -6dB.As a example by using 200MHz as detection frequency, a TDR equipment 121 is now adjusted respectively
Signal output frequency, its tranmitting frequency is in 200MHz, at the same respectively adjustment electric bridge 130 S31 and S41 coupled systemes
Number m values, at this moment couple the absolute value of the difference of degree of unbalancedness, i.e. more than 20dB, i.e., now coupling imbalance reaches | S31-S41 |
20dB, now loss parameter S31 about -0.5dB, S41 of the signal of a TDR equipment 121 in electric bridge 130 are less than -20dB, S41
Influence to S31 is negligible, it is believed that the detectable signal of a TDR equipment 121 has been entered into the first leakage cable 301, to the
One leakage cable 301 is monitored.Similarly, the detectable signal of the 2nd TDR equipment 122 after electric bridge 130 by entering in leakage cable, it is believed that
Only the second leakage cable 302 is monitored, so as to no longer need to carry out rear class combining.If which leakage cable breaks down, access
The detectable signal of the TDR of its road leakage cable can feed back to the TDR equipment for sending the detectable signal, so as to which be readily appreciated that
Leakage cable breaks down, it is no longer necessary to rear class combiner.
The leakage cable detection method that the present invention is provided, the signal of access system is combined with the detectable signal of TDR equipment,
By the electric bridge way of escape, most backward leakage cable output, by the adjustment the loss system degree of coupling between the port of electric bridge 130, makes coupling not
The degree of balance reaches certain value, makes the fault message of leakage cable and can directly be detected in the TDR equipment that TDR detectable signals are sent to it, with
Traditional leakage cable detection method compares, and eliminates the combining treatment of rear class, reduces loss, operates detection more simple.
Claims (6)
1. a kind of leakage cable detection system, is connected between multiple access systems and leakage cable, it is characterised in that：Closed including a POI
First TDR equipment of road device and the connection corresponding with a POI combiners and the 2nd PO I combiners of the 2nd POI combiners and
2nd TDR equipment and electric bridge；The input of the first, second POI combiners and multiple access systems and it is corresponding first,
2nd TDR equipment is connected, while the first, second POI combiners output end is corresponding with the input of the electric bridge respectively connecting
Connect, the output end of the electric bridge is used to be connected with leakage cable.
It is 2. according to claim 1 to leak cable detection system, it is characterised in that：The first TDR equipment and the 2nd TDR equipment
The signal band of output is less than 698M Hz.
It is 3. a kind of to leak cable detection method, it is characterised in that：Leakage cable detection system described in usage right requirement 1；It includes following
Step：
The signal of multiple access systems is divided into two groups, the signal and a TDR equipment and the 2nd TDR equipment of two groups of access systems
Detectable signal correspond be combined, formed the first combining signal and the second combining signal；
The first combining signal and the second combining signal to leakage cable by exporting again after electric bridge combining.
It is 4. according to claim 3 to leak cable detection method, it is characterised in that：The first TDR equipment and the 2nd TDR are set
The signal band of standby output is controlled in below 698M Hz.
It is 5. according to claim 4 to leak cable detection method, it is characterised in that：Adjust an input of the electric bridge respectively with
Two between two output ends loss parameters, make the defeated of described two loss parameters the first TDR equipment of correspondence or the 2nd TDR equipment
The absolute value for going out the difference of signal amplitude is more than 18dB.
It is 6. according to claim 5 to leak cable detection method, it is characterised in that：One input point of the adjustment electric bridge
Two loss parameters not between two output ends refer to two coefficient of coup m of loss parameter by adjusting the electric bridge
Value makes the absolute value of the difference between described two loss parameters be more than 18dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710050055.7A CN106712873B (en) | 2017-01-23 | 2017-01-23 | Leaky cable detection system and leaky cable detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710050055.7A CN106712873B (en) | 2017-01-23 | 2017-01-23 | Leaky cable detection system and leaky cable detection method |
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| CN106712873A true CN106712873A (en) | 2017-05-24 |
| CN106712873B CN106712873B (en) | 2023-03-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109298282A (en) * | 2017-12-12 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of method of polymorphic type cable connection system accurate fault location |
| CN111181593A (en) * | 2019-11-27 | 2020-05-19 | 京信通信技术(广州)有限公司 | POI device and wireless coverage system |
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| CN111181593A (en) * | 2019-11-27 | 2020-05-19 | 京信通信技术(广州)有限公司 | POI device and wireless coverage system |
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| Publication number | Publication date |
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| CN106712873B (en) | 2023-03-31 |
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