CN103874116A - Multi-system combiner platform and method for detecting cable fault points of leaky coaxial cable - Google Patents
Multi-system combiner platform and method for detecting cable fault points of leaky coaxial cable Download PDFInfo
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- CN103874116A CN103874116A CN201410120680.0A CN201410120680A CN103874116A CN 103874116 A CN103874116 A CN 103874116A CN 201410120680 A CN201410120680 A CN 201410120680A CN 103874116 A CN103874116 A CN 103874116A
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Abstract
The invention relates to a multi-system combiner platform which comprises a passive POI and a detection module connected with the passive POI. The detection module comprises a central control unit, a signal generator, a clock controller and a wave detector, wherein the signal generator, the clock controller and the wave detector are connected with the central control unit. The central control unit sends an instruction for transmitting a test signal, so that the signal generator is driven to transmit the test signal to a leaky coaxial cable needing to be detected, and whether the leaky coaxial cable has fault points and positions of the fault points are calculated and judged according to time data monitored through the clock controller and voltage data converted by the wave detector. The multi-system combiner platform is high in leaky coaxial cable fault point detection accuracy and good in practicality. Besides, the invention further relates to a method for detecting the fault points of the leaky coaxial cable by means of the multi-system combiner platform.
Description
[technical field]
The present invention relates to a kind of communication equipment, particularly a kind of multisystem mixing platform, also relates to a kind of method of utilizing this multisystem mixing platform judgement to leak cable fault point.
[background technology]
Along with the development that the sleeve configuration mobile communication such as high ferro, subway, tunnel and overlength bridge cover, the application of leaking cable is more and more general.Because the quality of leakage cable directly affects the quality that signal of communication covers, be the quality that guarantees communication overlay, need to carry out to leaking cable the maintenance of timing and/or not timing, and keep in repair in time in the time that leakage cable breaks down.Be example take tunnel, due to construction site, access tunnel is very inconvenient, breaks down once leak cable, is difficult to failure judgement point position, and then the efficiency of impact maintenance leakage cable.
Multi-system access platform (Point Of Interface, POI) is as overlay device, and it is directly connected with leakage cable.But POI belongs to inactive component, do not possess the measuring ability to leaking cable.
As shown in Figure 1, conventional POI is pure inactive component, does not possess detectability, can not detect the Lou position of failure point of cable.As shown in Figure 2, there is the POI of part monitoring function just on the basis of conventional POI, to increase frequency-domain analysis function, and there is not signal in the existing POI self with part monitoring function, just utilize and process by its source signal, and then failure judgement point position.
Source signal (this source signal can be arbitrary system signal of operator, as GSM, CDMA etc.) is by the BTS(base station of POI) port enters conventional POI.Because conventional POI is as inactive component, can't process this signal, this source signal can be directly exports to Lou in cable by the ANT port of this POI.
Usually, leak in the normal situation of cable, its impedance is mated, i.e. impedance is Z0.In the time of signal process L1 length, break down a little, impedance has become Z1, reflection has now occurred, and the monitoring unit of POI detects reflected signal, and can calculate and the relation of incoming signal according to the intensitometer of reflected signal, thereby the return loss of calculating, such as incoming signal is XdBm, reflected signal is YdBm, and return loss is RL=X-Y (dB).Because communication providers provides or the return loss of the leakage cable that adopts is known, the POI with monitoring function can judge this impedance transformation place according to the return loss at impedance transformation place and whether belong to fault point.
But, as can be seen from the above description, the detected reflected signal of the POI of tradition with monitoring function, the position of its feedback is the connector position place shown in Fig. 2, therefore, no matter is the reflection of reflected signal or the Z2 of Z1, finally all feeds back on this connector.Because this POI does not possess time domain analysis function, cannot tell each reflected signal is the reflected signal of returning from which impedance transformation point position feedback, whole antenna feeder can only be done to as a whole consideration, thereby reduce the accuracy detecting, and then affect the efficiency of maintenance.
In addition, due to lossy in signals transmission, the loss of leaking cable is ZdB/100m, so reflected signal has decay, add the decay of incident, length is that the cable complete attenuation of L is L × Z/100 (unit: dB), so when the position of L2 in Fig. 2 produces reflex time, return in the time of the monitoring of POI signal enough little, even if there is very large fault, monitoring also can be thought normal, because return loss RL=X-Y, Y is due to decay in test, little more a lot of than X, so think that it is normal that RL is greater than thresholding (normally-14dB), and this is not obviously inconsistent with actual.
In sum, plain edition POI or only the POI with frequency domain monitoring exist following limitation in leaking cable position of failure point detecting:
1, plain edition POI can not judge leakage cable abort situation;
2, only the monitoring error of the POI with frequency domain monitoring function is larger, the position of failure point that it detects
For fault point is apart from 2 times of length of ANT end that leak cable, and when fault point distance A NT port
Time far away, position that substantially cannot fault inspecting.
[summary of the invention]
Primary and foremost purpose of the present invention is to provide a kind of can accurately detect the Lou multisystem mixing platform of cable position of failure point.
Another object of the present invention is to provide a kind of multisystem mixing platform that utilizes to detect the method for leaking cable fault point.
For realizing this object, the present invention adopts following technical scheme:
A kind of multisystem mixing platform, the mixer that comprises passive block and be electrically connected with described passive block, described multisystem mixing platform also comprises detection module; Described detection module comprises signal generator, clock controller, wave detector and central control unit; Described signal generator is connected with described mixer, for the instruction that receives central control unit to send test massage to the cable that leaked hunting; Described wave detector is connected with described mixer, for receiving the described test signal of described leakage cable impedance transformation point reflection, and described test signal is separately converted to incident voltage and reflected voltage in incident power and the reflection power of described impedance transformation point; Described clock controller is connected with described mixer, at the impedance transformation point of described leakage cable, occurs for launch time and the described test signal of monitoring of monitoring described test signal the time of reflecting; Described central control unit is connected with described signal generator, clock controller and wave detector respectively, calculates and judge the position of failure point of described leakage cable for the voltage data transforming to instruction, the time data detecting according to described clock controller and the described wave detector of an emissioning testing signal of described signal generator output.
Described central control unit comprises and the FPGA circuit board of described mixer electrical connection and the MCU being connected with described FPGA circuit board; Described MCU comprises the parameter input unit, processing unit and the interface display unit that are connected with FPGA respectively, and described processing unit is connected with described parameter input unit and interface display unit respectively; Described parameter input unit is for the instruction to an emissioning testing signal of described signal generator output, the voltage data that described processing unit transforms for the time data that detects according to described clock controller and described wave detector calculates and judges the position of failure point of described leakage cable, and described interface display unit is used for demonstrating the result of described calculating, judgement.
The input of described wave detector is connected with described mixer and described FPGA respectively with output.
A method for cable fault point is leaked in the detection that above-mentioned multisystem mixing platform is implemented, and it comprises the following steps:
Send test massage to the leakage cable of need detection according to sense command; There is the time of reflection in launch time and the described test signal of monitoring described test signal, and described test signal is separately converted to incident voltage and reflected voltage in incident power and the reflection power of impedance transformation point at the impedance transformation point of described leakage cable; Calculate and judge the position of failure point of described leakage cable according to monitored time data and voltage data.
Describedly calculate and judge that the step of the position of failure point of described leakage cable comprises according to monitored time data and voltage data: the distance of calculating described impedance transformation and put described multisystem mixing platform according to described time data; Calculate the reflection coefficient of described leakage cable impedance transformation point according to described voltage data, and then calculate the standing-wave ratio of impedance transformation point according to described reflection coefficient; By described standing-wave ratio and the contrast of default leakage cable standing-wave ratio threshold value, thereby judge that whether this impedance transformation put fault point, if fault point, leak the position of failure point of cable in conjunction with described Distance Judgment.
The computing formula that described leakage cable impedance transformation is put the distance L of described multisystem mixing platform is:
wherein, L is length, and C is light speed in a vacuum, and T is the time, ε
rfor dielectric constant.
The computing formula of the reflection coefficient of described leakage cable impedance transformation point is:
The method that described multisystem mixing platform detects leakage cable fault point also comprises that described multisystem mixing platform carries out the step of fading compensation to the signal that also continues to transmit through trouble spot judging in described leakage cable.
Compared with prior art, beneficial effect of the present invention is as follows:
1, multisystem mixing platform of the present invention is provided with the detection module that comprises signal generator, clock controller, wave detector and central control unit, signal generator can send an intermediate frequency, with the incoherent test signal of covering system, the time data that central control unit obtains according to this test signal respectively according to clock controller and wave detector and voltage data calculate, judge and demonstrate the Lou position of failure point of cable.
2, multisystem mixing platform of the present invention has time domain, frequency-domain analysis function, not only can accurately detect the Lou abort situation of cable, and the performance parameter such as impedance, standing wave of cable particular location is leaked in monitoring in real time, thereby judges the performance of leaking cable particular location.
3, multisystem mixing platform of the present invention is because the TDR monitoring software in MCU can carry out fading compensation to test signal, thereby it is comparatively accurate to guarantee to leak the detection of cable position of failure point.
[accompanying drawing explanation]
Fig. 1 is the fundamental diagram of the conventional multisystem mixing platform of prior art;
Fig. 2 is that the multisystem mixing platform of prior art band frequency domain monitoring function detects the fundamental diagram that leaks cable fault point;
Fig. 3 is that multisystem mixing platform of the present invention detects the fundamental diagram that leaks cable fault point;
Fig. 4 is the structural representation of the multisystem mixing platform of one embodiment of the invention.
[embodiment]
Below in conjunction with accompanying drawing and exemplary embodiment, the present invention is further described, wherein in accompanying drawing, identical label all refers to identical parts.If the detailed description of known technology is for illustrating that feature of the present invention is unnecessary, by its omission.In addition, should be appreciated that, in the time that we claim that element is "connected" to another element, it can be directly connected to other elements, or also can have intermediary element.In addition, " connection " used herein can also comprise wireless connections.Wording "and/or" used herein comprises whole or arbitrary unit of listing item and all combinations that one or more is associated.
Those skilled in the art can know, and signal transmits in leakage cable, and primary event just occurs in the position (calling " impedance transformation point " in the following text) that often runs into impedance transformation.The present invention tries to achieve impedance transformation by the reflected signal of test signal and puts the distance L and the reflection coefficient of leakage cable at impedance transformation point place that the ANT of POI holds, thereby leak standing-wave ratio or the return loss of cable at impedance transformation point according to reflection coefficient, and then judge that whether this impedance transformation put fault point, if fault point, the position of Binding distance L indication fault point.About the solution procedure of distance L, reflection coefficient and the concrete determining step of leakage cable fault point, will below be elaborated, do not repeat for this reason herein.
Refer to 3 and Fig. 4, POI2 of the present invention, transmits leaking cable for the source signal of communication providers being closed to road, and Real-Time Monitoring leaks the performance condition of cable or detects and leaks cable position of failure point.It comprises: mixer 22, passive block and detection module 21, and described passive block is connected in the RF end of described mixer 22, and described detection module 21 is connected with described mixer 22.For clearer explanation structure of the present invention and principle, also disclose the leakage cable 3 being connected with described POI2.
Passive block of the present invention comprises passive POI20, for will for example, closing road to described leakage cable 3 from the source signal of communication providers (move, telecommunications, UNICOM or other communication providerses).Alleged passive POI20 herein, in fact refers to and does not have cable fault point POI measuring ability, traditional of leakage.That is to say, POI of the present invention is that the one of carrying out on the basis of conventional P OI is improved, and the behaviour in service that makes POI of the present invention have Real-Time Monitoring to leak cable 3 can detect Lou the impedance transformation of cable and whether put fault point the function of the position of indication fault point.
Consult Fig. 4, detection module 21 of the present invention, for detection of leaking the position of failure point of cable 3, mainly comprises: central control unit 214, for send test massage to the signal generator 211 of described leakage cable 3, for monitor the reflected signal of test signal x time and this test signal arrive wave detector moment clock controller 213 and for test signal is converted to respectively to the wave detector 212 of incident voltage and reflected voltage in the incident power of impedance transformation point and reflection power; Described central control unit 214 is connected with described signal generator 211, clock controller 213 and wave detector 212 respectively, and described clock controller 213 is also connected with described signal generator 211 and wave detector 212.
Consult Fig. 3, described central control unit 214 comprises FPGA circuit board 2141 and MCU2140, and described FPGA circuit board 2141 is connected with described mixer 22, and described MCU2140 is connected with described FPGA circuit board 2141.On described FPGA circuit board 2141, be laid with signal generating unit, and be provided with the chip socket of clock controller 213 and connector for being connected described wave detector 212, thereby can, after being connected with clock chip described later, AGC wave detector 2120 etc., form respectively corresponding signal generator 211, clock controller 213 and wave detector 212.
As shown in Figure 3, described MCU2140 comprises parameter input unit 2140a, processing unit 2140b and interface display unit 2140c.Described parameter input unit 2140a is connected with described processing unit 2140b, interface display unit 2140c respectively, also be connected with described signal generating unit 2141a, described parameter input unit 2140a is used for inputting required formula, parameter, the threshold value of cable standing-wave ratio is leaked in pre-input, and the instruction that sends test massage of input, etc.Described processing unit 2140b is connected with described parameter input unit 2140a, interface display unit 2140c respectively, also be connected with described clock control cell 2141b, power calculation unit 2141c respectively, for the operating state of control signal generator 211, clock controller 213 and wave detector 212, whether the impedance transformation that calculates, judge leakage cable 3 puts fault point; Described interface display unit 2140c is used for the position that shows parameter, the result of calculation of input and show fault point.
The above signal generator 211, clock controller 213 and wave detector 212 all can be selected as required flexibly by those skilled in the art, only need it under the control of central control unit 214, complete its function separately in the present invention.
As shown in Figure 3, described signal generator 211 of the present invention preferably includes the signal generating unit 2141a being located on described FPGA circuit board 2141, described signal generating unit 2141a, for being subject to the order-driven of MCU2140, sends the leakage cable 3 of a test signal to required detection.Described test signal is a radiofrequency signal being produced by signal generating unit, and this radiofrequency signal is through the converted intermediate-freuqncy signal of these signal generator 211 frequency-conversion processing, this intermediate-freuqncy signal and described source signal is irrelevant disturbs.
Described clock controller 213 of the present invention preferably includes clock IC chip (not shown), it is upper that described clock IC chip (not shown) is plugged on the clock controller chip socket (not shown) of FPGA circuit board 2141, for monitoring the x time of test signal and this test signal in the moment of leaking cable 3 and transmit and occur each state reflecting.Time monitoring is carried out in the clock control instruction that described clock IC chip provides according to MCU2140, can be provided in MCU2140 and provides after clock control instruction, specifies the time-parameters of described each state of test signal.
Described wave detector 212 of the present invention preferably includes AGC wave detector 2120, one end of described AGC wave detector 2120 is by an ADC216(Analog Digital Converter, analog to digital converter) be connected with described FPGA circuit board 2141, its other end is connected with described mixer 22 by described selector switch 217, for described test signal is exported to described ADC216 after the incident power of impedance transformation point and reflection power are converted to respectively incident voltage and reflected voltage, and after processing, described ADC216 is transported in described MCU2140, process for described MCU2140.
Known according to description above, in POI2 of the present invention, its detection module 21 also comprises a selector switch 217, DAC215(Digital Analog Converter, digital to analog converter) and ADC216.
Described selector switch 217 can be according to the switch controlling signal of MCU2140 output, select its mode of operation, for example its first switch controlling signal by MCU drives, be operated in transmitting chain state,, from sending, signal generating unit 2141a transmits at described DAC215, mixer 22 and in leaking cable 3 successively for described test signal; Or its second switch control signal by MCU2140 drives, and is switched to receiver, process through AGC wave detector 2120, ADC216 for the reflected signal of described test signal, and finally calculate the standing-wave ratio of impedance transformation point at MCU2140.
The input of described DAC215 is connected with described FPGA circuit board 2141, its output is connected with described selector switch 217, and described MCU2140, signal generating unit 2141a, DAC215 and the common composition of selector switch 217 are for the transmitting chain of described test signal transmission.
Described ADC216 changes into digital signal for the voltage signal that wave detector 212 is transformed, for described MCU2140 identification, processing.The output of described ADC216 is connected with described FPGA circuit board 2141, its input is connected with described AGC wave detector 2120, the input of described AGC wave detector 2120 is connected with a contact of described selector switch 217, and described selector switch 217, AGC wave detector, ADC216 and MCU2140 form the receiver of the reflected signal that receives test signal jointly.
The operation principle of POI of the present invention is:
Described MCU2140 is according to the external command receiving, export the instruction of an emissioning testing signal, send a clock control instruction that drives described clock controller 213 to work to clock controller 213 to described signal generating unit 2141a, drive described signal generating unit 2141a emissioning testing signal, and drive described clock controller 213 to monitor above-mentioned test signal.In addition, described MCU2140 also exports a driving selector switch 217 and is switched to by receiver the first switch controlling signal of transmitting chain, makes described selector switch 217 be switched to transmitting chain, is delivered to Lou cable 3 for described test signal by transmitting chain.
Described clock controller 213 detects and records the moment T0 of this test signal transmitting.
Described test signal enters by the ANT port of described POI2 and transmission in leakage cable 3, and the first impedance transformation that arrives leakage cable 3 in the T1 moment is put 30 places, and puts 30 places' generation first reflections at this first impedance transformation.Now, a second switch control signal of described MCU2140 output, makes described selector switch 217 be switched to the operating state of receiver.The time tranfer of the reflected signal process t1 (t1=T1-T0) of this test signal generation first reflection is in described AGC wave detector 2120.
Described AGC wave detector 2120 is according to the reflected signal receiving, incident power and reflection power that described test signal is put to 30 places at this first impedance transformation change into respectively incident voltage Vi and reflected voltage Vr, and export to described MCU2140 after being processed by described ADC216.
The voltage data that described MCU2140 transforms according to wave detector 21 is processed and is finally judged whether described the first impedance transformation point 30 belongs to fault point.If described the first impedance transformation point 30 belongs to fault point, show the position of this fault point at the interface display unit of MCU2140 2140c, this fault point is to the distance of POI.
Because test signal exists decline in transmitting procedure, in order not affect the testing result for the treatment of leak detection cable, POI of the present invention is also provided with TDR monitoring software in central control unit 214, and the test signal that reflection has occurred at impedance transformation point is carried out to fading compensation.
Continue transmission in leakage cable 3 through the test signal of fading compensation, it arrives the position of the second impedance transformation point 31 in the T2 moment, due to the variation of impedance, there is reflection for the second time at this in test signal, and its reflected signal is through t2(t2=T2-T0) time arrive in wave detector 212, clock controller 213 is recorded the moment now simultaneously.Accordingly, described MCU2140 can obtain the ANT end of this second impedance transformation point 31 to POI2 distance, leak cable 3 and put the numerical value such as reflection coefficient, standing-wave ratio at 31 places at the second impedance transformation, thereby judge whether fault point of this second impedance transformation point 31.
In like manner, the transmission in leakage cable 3 of this test signal, just there is primary event in the position that often runs into impedance transformation.Described MCU2140 can be according to test signal the transmitting of each impedance transformation point reflection, and tries to achieve Lou cable 3 in the standing-wave ratio at each impedance transformation point place, thereby judge that whether described impedance transformation put fault point, and show the position at place, fault point.
POI of the present invention, realizes pulse (being test signal) transmitting, switching over and data acquisition function by MCU and FPGA circuit board.In POI of the present invention, the operating frequency of FPGA circuit board 2141 is 125MHz, so the cycle of its clock is 1/125=8ns, be T=8ns minimum resolving time.Suppose that test signal is V in the speed of leaking in cable,
Thus, the theoretical length (theoretical error) of the distinguishable leakage cable of the minimum of POI of the present invention is L
l=V*T ≈ 1.5m, is less than the accuracy of detection (L=10m) that communication system requires, and therefore, POI of the present invention can meet the operating accuracy requirement of leaking cable detection system.
The invention also discloses a kind of method that uses above-mentioned POI to detect leakage cable position of failure point, it comprises the following steps:
The sense command that described POI receives according to its detection module 21 sends test massage to the leakage cable 3 of need detection.
In described detection module 21, there is the moment of reflecting at the impedance transformation point of described leakage cable 3 in x time and described test signal that described clock controller 213 is monitored described test signal.Described MCU2140, based on above-mentioned two moment, can put in the hope of the impedance transformation of described leakage cable the distance L of the ANT end of POI according to formula 1.
Wherein, L is length, and C is light speed in a vacuum, and T is the time, ε
rfor dielectric constant.
Described wave detector 212 is separately converted to incident voltage and reflected voltage by described test signal in incident power and the reflection power of impedance transformation point.Described MCU2140, based on described incident voltage and reflected voltage, can obtain the reflection coefficient of the impedance transformation point of described leakage cable according to formula 2.
Wherein, ρ is reflection coefficient, and Vi is incident voltage, and Vr is reflected voltage.
As everyone knows, reflection coefficient is conventional physical quantity, and by reflection coefficient, those skilled in the art are easy to just can obtain the performance parameter information of the leakage cables such as impedance, standing-wave ratio, return loss.
And different communication providerses, as GSM, CDMA etc., its minimum threshold of standing-wave ratio that leaks cable 3 is not quite similar, but is also fixing or has a known scope.
Thereby described central control unit 214 can calculate and judge described impedance transformation and whether put fault point.Particularly, described central control unit 214 calculates the Lou reflection coefficient of cable 3 impedance transformation points according to wave detector 212 voltage data obtaining of processing, and calculate the standing-wave ratio of this impedance transformation point according to reflection coefficient, and then the standing-wave ratio of impedance transformation point and default standing-wave ratio threshold value are compared, if the standing-wave ratio of impedance transformation point is lower than the standing-wave ratio threshold value of default supplier's leakage cable, this impedance transformation point does not belong to fault point, otherwise this impedance transformation point belongs to fault point.
In the time that POI2 detects certain impedance transformation point for fault point, it can be in conjunction with aforesaid distance, indicates the position of this fault point, and this fault point is L to the distance of described POI2.
In present embodiment, the fault point of leaking cable 3 is recently judged by standing wave.In other embodiments, those skilled in the art can be with reference to method of the present invention, and the threshold value of leakage cable 3 return losses of the return loss contrast supplier supply of putting by impedance transformation is judged.
By above method, the maintenance staff of leaking cable accurately judges whether leaking cable 3, the position of fault and fault point has occurred, thereby in time this leakage cable fault point is processed.
As everyone knows, in the transmission of signal, there is the process of continuous decrement, thereby, for the accuracy that guarantees that leak cable fault point is detected, the method that POI of the present invention detects leakage cable position of failure point also comprises that described POI carries out the step of fading compensation to the signal that also continues to transmit through trouble spot judging in described leakage cable.
POI of the present invention utilizes the TDR monitoring software being provided with in it to carry out fading compensation to the test signal of this process impedance transformation point.As shown in Equation 4, according to the loss of leaking cable 3, can calculate the loss in length L, thereby carry out fading compensation.
Ins=L*Z/100 (formula 4)
Wherein, Ins: loss; L: length; Z: hundred meters of losses.
Although shown exemplary embodiments more of the present invention above, but it should be appreciated by those skilled in the art that, in the situation that not departing from principle of the present invention or spirit, can make a change these exemplary embodiments, scope of the present invention is limited by claim and equivalent thereof.
Claims (8)
1. a multisystem mixing platform, the mixer that comprises passive block and be electrically connected with described passive block, is characterized in that, described multisystem mixing platform also comprises detection module;
Described detection module comprises signal generator, clock controller, wave detector and central control unit;
Described signal generator is connected with described mixer, for the instruction that receives central control unit to send test massage to the cable that leaked hunting;
Described wave detector is connected with described mixer, for receiving the described test signal of described leakage cable impedance transformation point reflection, and described test signal is separately converted to incident voltage and reflected voltage in incident power and the reflection power of described impedance transformation point;
Described clock controller is connected with described mixer, at the impedance transformation point of described leakage cable, occurs for launch time and the described test signal of monitoring of monitoring described test signal the time of reflecting;
Described central control unit is connected with described signal generator, clock controller and wave detector respectively, calculates and judge the position of failure point of described leakage cable for the voltage data transforming to instruction, the time data detecting according to described clock controller and the described wave detector of an emissioning testing signal of described signal generator output.
2. multisystem mixing platform according to claim 1, is characterized in that, described central control unit comprises and the FPGA circuit board of described mixer electrical connection and the MCU being connected with described FPGA circuit board;
Described MCU comprises the parameter input unit, processing unit and the interface display unit that are connected with FPGA respectively, and described processing unit is connected with described parameter input unit and interface display unit respectively;
Described parameter input unit is for the instruction to an emissioning testing signal of described signal generator output, the voltage data that described processing unit transforms for the time data that detects according to described clock controller and described wave detector calculates and judges the position of failure point of described leakage cable, and described interface display unit is used for demonstrating the result of described calculating, judgement.
3. multisystem mixing platform according to claim 2, is characterized in that, the input of described wave detector is connected with described mixer and described FPGA respectively with output.
4. a method for cable fault point is leaked in the detection that the multisystem mixing platform as described in claims 1 to 3 any one is implemented, and it is characterized in that, comprises the following steps:
Send test massage to the leakage cable of need detection according to sense command;
There is the time of reflection in launch time and the described test signal of monitoring described test signal, and described test signal is separately converted to incident voltage and reflected voltage in incident power and the reflection power of impedance transformation point at the impedance transformation point of described leakage cable;
Calculate and judge the position of failure point of described leakage cable according to monitored time data and voltage data.
5. the method for cable fault point is leaked in detection according to claim 4, it is characterized in that,
Describedly calculate and judge that the step of the position of failure point of described leakage cable comprises according to monitored time data and voltage data:
Calculate described impedance transformation and put the distance of described multisystem mixing platform according to described time data;
Calculate the reflection coefficient of described leakage cable impedance transformation point according to described voltage data, and then calculate the standing-wave ratio of impedance transformation point according to described reflection coefficient;
By described standing-wave ratio and the contrast of default leakage cable standing-wave ratio threshold value, thereby judge that whether this impedance transformation put fault point, if fault point, leak the position of failure point of cable in conjunction with described Distance Judgment.
6. multisystem mixing platform according to claim 5 detects the method for leaking cable fault point, it is characterized in that, the computing formula that described leakage cable impedance transformation is put the distance L of described multisystem mixing platform is:
7. multisystem mixing platform according to claim 5 detects the method for leaking cable fault point, it is characterized in that, the computing formula of the reflection coefficient of described leakage cable impedance transformation point is:
8. multisystem mixing platform according to claim 4 detects the method for leaking cable fault point, it is characterized in that, also comprises that described multisystem mixing platform carries out the step of fading compensation to the signal that continues to transmit in described leakage cable after trouble spot judging.
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| CN110275092A (en) * | 2019-07-18 | 2019-09-24 | 上海创远仪器技术股份有限公司 | Based on the method for overcoming cable properties overcompensation technology to realize fault location processing |
| CN113567801A (en) * | 2020-04-28 | 2021-10-29 | 南宁富桂精密工业有限公司 | Wire detection device and wire detection method |
| CN114553253A (en) * | 2022-01-17 | 2022-05-27 | 中国电子科技集团公司第五十四研究所 | Multi-channel communication device for synchronously transmitting multiple signals |
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