CN109379148A - Detection method of weak fault signal, device, computer equipment and storage medium - Google Patents
Detection method of weak fault signal, device, computer equipment and storage medium Download PDFInfo
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- CN109379148A CN109379148A CN201811422558.3A CN201811422558A CN109379148A CN 109379148 A CN109379148 A CN 109379148A CN 201811422558 A CN201811422558 A CN 201811422558A CN 109379148 A CN109379148 A CN 109379148A
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- H—ELECTRICITY
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- H04B17/30—Monitoring; Testing of propagation channels
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Abstract
This application involves a kind of Detection method of weak fault signal, device, computer equipment and storage mediums.The described method includes: obtaining the failure echo-signal of fault point；The failure echo-signal is what primary fault echo-signal was handled by group delay；Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；The pure echo-signal is used to determine the fault message of fault point.Being able to solve existing Detection method of weak fault signal using this method has that accuracy in detection is low.
Description
Technical field
This application involves signal detection technique fields, more particularly to a kind of Detection method of weak fault signal, device, meter
Calculate machine equipment and storage medium.
Background technique
Cable is leaked, as a supplement in wireless coverage solution, especially suitable for vcehicular tunnel, railway tunnel, city
The limited region of the radio signal propagations such as city's track, high-speed rail.It is transmitted as signal is carry in wireless network leakage cable covering system
Sole support, reliability is most important to network.
The laying of usually leakage cable is differed apart from several hundred rice to several kilometers, if manually safeguarded entirely, be difficult it is timely simultaneously
Accurate to complete leakage cable fault detection, traditional test method is to realize receiving and transmitting signal using transmit-receive switch technology, circulator technology
Capture, when measuring distance very in short-term, be easy that there are faint echo-signals to be flooded by circulator interference signal, lead to not standard
The problem of really obtaining echo-signal.
Therefore, existing Detection method of weak fault signal has that accuracy in detection is low.
Summary of the invention
Based on this, it is necessary to which in view of the above technical problems, providing one kind can be improved leakage cable fault-signal accuracy in detection
Leakage cable fault-signal detection method, device, computer equipment and storage medium.
A kind of Detection method of weak fault signal, which comprises
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal passes through group delay
What processing obtained；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；The pure echo-signal is used
In the fault message for determining fault point.
The interference signal filtered out in the smooth echo-signal in one of the embodiments, obtains pure echo
Signal, comprising:
Acquisition system reference signal；
Wave-average filtering is carried out to the system reference signal, obtains the smooth reference signal；
The smooth reference signal is subtracted from the smooth echo-signal, obtains pure echo-signal.
The acquisition system reference signal in one of the embodiments, comprising:
The system of the Weak fault signal detection is connected into matched load, obtains system reference signal.
In one of the embodiments, before the failure echo-signal for obtaining leakage cable fault point, further includes:
Excitation detection signal is generated, and excitation detection signal is converted into transmitting detection signal；
Send the transmitting detection signal；
The fault point is received for the reflection echo signal of the transmitting detection signal feedback；
According to the reflection echo signal, the failure echo-signal is obtained.
It is described in one of the embodiments, that excitation detection signal is converted into transmitting detection signal, comprising:
Digital-to-analogue conversion is carried out to excitation detection signal, obtains analog detection signal；
The analog detection signal is subjected to simulation upconversion process, obtains analog intermediate frequency detection signal；
Analog intermediate frequency detection signal is subjected to Frequency mixing processing, obtains radio frequency test signal；
The radio frequency test signal is subjected to signal amplification, obtains the power amplifier transmitting detection signal；
The power amplifier is emitted into detection signal and carries out time delay processing, obtains the transmitting detection signal.
It is described in one of the embodiments, that the failure echo-signal is obtained according to the reflection echo signal, packet
It includes:
The reflection echo signal is subjected to time delay processing conversion, obtains pretreatment rf echo signal；
The pretreatment rf echo signal is converted into echo signal of intermediate frequency；
The echo signal of intermediate frequency is subjected to analog-to-digital conversion, obtains the first digital echo signal；
First digital echo signal is subjected to sample rate variation, obtains the second digital echo signal；
Second digital echo signal is subjected to low-pass filtering, obtains the failure echo letter of the leakage cable fault point
Number.
It is described in one of the embodiments, that the pretreatment rf echo signal is converted into echo signal of intermediate frequency, packet
It includes:
The pretreatment rf echo signal is subjected to signal amplification, obtains amplification echo-signal；
The amplification echo-signal and system local oscillator are subjected to Frequency mixing processing, obtain echo signal of intermediate frequency.
A kind of Weak fault signal supervisory instrument, described device include:
Module is obtained, for obtaining the failure echo-signal of leakage cable fault point；The failure echo-signal is primary fault
What echo-signal was handled by group delay；
Wave-average filtering module obtains smooth echo-signal for carrying out wave-average filtering to the failure echo-signal；
Module is filtered out, for filtering out the interference signal in the smooth echo-signal, obtains pure echo-signal；It is described pure
Net echo-signal is used to determine the fault message of fault point.
A kind of computer equipment, including memory and processor, the memory are stored with computer program, the processing
Device performs the steps of when executing the computer program
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal passes through group delay
What processing obtained；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；The pure echo-signal is used
In the fault message for determining fault point.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
It is performed the steps of when row
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal passes through group delay
What processing obtained；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；The pure echo-signal is used
In the fault message for determining fault point.
Above-mentioned Detection method of weak fault signal, device, computer equipment and storage medium, by the event for obtaining fault point
Hinder echo-signal；Wave-average filtering is carried out to failure echo-signal, obtains smooth echo-signal；It filters out dry in smooth echo-signal
Signal is disturbed, pure echo-signal is obtained；The electromagnetic wave that pure echo-signal can be truly reflected out leakage cable failure point reflection returns
Wave waveform solves the problems, such as that there are the echo-signals of failure by the interference of other electromagnetic wave signals for determining leakage cable.Therefore, originally
The order of accuarcy of Weak fault detection of the backscatter signal can be improved in embodiment.
Detailed description of the invention
Fig. 1 is a kind of applied environment figure of Detection method of weak fault signal in one embodiment；
Fig. 2 is a kind of flow diagram of Detection method of weak fault signal in one embodiment；
Fig. 3 is a kind of structural block diagram of Weak fault signal supervisory instrument in one embodiment；
Fig. 4 is the internal structure chart of computer equipment in one embodiment；
Fig. 5 is the echo amplitude spectrum of failure echo-signal in one embodiment；
Fig. 6 is the echo amplitude spectrum of pure echo-signal in one embodiment；
Fig. 7 is a kind of system block diagram of Weak fault signal supervisory instrument in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
Detection method of weak fault signal provided by the present application can be applied in application environment as shown in Figure 1.Its
In, cable 104 can be leakage coaxial cable, and structure and common coaxial cable are almost the same, by inner conductor, dielectric
It is formed with the outer conductor three parts for being provided with periodical slot.Weak fault signal detection system 102 emits electricity to cable to be detected
Magnetic wave.When there are fault points for cable, for example, the failures such as exocuticle is damaged, deformation.According to the transmission theory of electromagnetic wave, electromagnetic wave
It can not all be conducted by cable, and then Weak fault signal detection system 102 can be reflected back, Weak fault signal system 102 is logical
It crosses and the electromagnetic wave received is analyzed, obtain the waveform of reflection electromagnetic wave, the failure of cable is judged by wave character.
In one embodiment, it as shown in Fig. 2, providing a kind of Detection method of weak fault signal, applies in this way
It is illustrated for Weak fault signal detection system in Fig. 1, comprising the following steps:
Step 202, the failure echo-signal of fault point is obtained；The failure echo-signal is primary fault echo-signal warp
Cross what group delay was handled.Wherein, failure echo-signal can reflect for fault point to Weak fault signal detection system 102
Baseband signal, signal spectrum includes the reflection echo signal of fault point, environmental disturbances, system itself interference etc..
In the specific implementation, the signal receiving end of Weak fault signal detection system 102 is opened, since system environments is complicated,
At this time Weak fault signal detection system 102 receive because isolation of system it is insufficient caused by transmitting leakage interference signal, in system
Portion's line interface or device interface standing wave deteriorate the reflection signal that introduces, system noise, internal system radio frequency interference, fault point
The electromagnetic wave that the Signal averagings such as the radio frequency interference that noise that reflection echo signal, cable receive, cable receive are formed, it is above-mentioned
Electromagnetic wave includes the electromagnetic wave that fault point is reflected back, and therefore, above-mentioned electromagnetic wave is named as failure echo-signal.Weak fault
Time delay processing unit is equipped in signal detection system 102, therefore Weak fault signal detection system 102 is receiving primary fault time
When wave signal, group delay processing can be carried out to primary fault echo-signal, failure echo-signal be obtained, to make because of isolation of system
Transmitting leakage interference signal caused by insufficient can separate in time scale with the reflection echo signal of fault point.
Step 204, wave-average filtering is carried out to failure echo-signal, obtains smooth echo-signal.
Since leakage cable signal working frequency range is relatively independent, leakage cable transmits the locality and equipment internal radio frequency line of itself
Isolation is bigger, therefore the radio frequency interference that internal system radio frequency interference and leakage cable receive can be very small, and has randomness
The characteristics of.Similarly, system noise also has at random.Therefore these random noises can be taken by multiple groups failure echo-signal
It is average, it even is eliminated to carry out reduction.
In the specific implementation, Weak fault signal detection system 102, which sends multiple groups to leakage cable, detects signal, leakage cable fault point is equal
Multiple groups detection signal can be reflected, the receiving end of Weak fault signal detection system 102 gets multiple groups failure echo letter
Number；Weak fault signal detection system 102, can be by calculating multiple groups failure echo letter after obtaining multiple groups failure echo-signal
Number mean value, so that multiple groups failure echo-signal is carried out wave-average filtering.After carrying out wave-average filtering, obtain eliminating noise
Echo-signal.Echo-signal due to eliminating noise is usually more smooth waveform, can will eliminate noise
Echo-signal be named as smooth echo-signal.
Step 206, the interference signal in smooth echo-signal is filtered out, pure echo-signal is obtained；Pure echo-signal is used
In the fault message for determining fault point.
By the radio frequency interference that after step 204, internal system radio frequency interference, leakage cable in failure echo-signal are received
It is eliminated with system noise, obtains smooth echo-signal.However, smooth echo-signal be still by transmitting leakage signal,
Internal system line interface or device interface standing wave deteriorate the composite signal of the reflection signal introduced and reflection echo signal composition.
Relative to reflection echo signal, emits leakage signal and internal system line interface or device interface standing wave deteriorates the reflection introduced
Signal influences Weak fault signal detection system 102 and determines pure echo-signal.Therefore, by transmitting leakage signal and system
Interconnector interface or device interface standing wave deteriorate the reflection signal introduced and are referred to as interference signal.It filters out in smooth echo-signal
Interference signal, so that it may obtain pure echo-signal, pure echo-signal reflection leakage cable fault point institute reflection electromagnetic wave.
In the specific implementation, Weak fault signal detection system 102 carries out wave-average filtering in complete paired fault echo-signal, obtain
To after smooth echo-signal, Weak fault signal detection system 102 filtered out from smooth echo-signal because service system every
From leakage signal caused by deficiency, internal system line interface or device interface standing wave deteriorate the echo-signal introduced, pass through filter
Except the interference signal in smooth echo-signal, so as to obtain being able to reflect pure time of leakage cable fault point institute reflection electromagnetic wave
Wave signal.
Fig. 5 is the echo amplitude spectrum of failure echo-signal in one embodiment, and Fig. 6 is pure echo letter in one embodiment
Number echo amplitude spectrum.From the comparison of two attached drawings as it can be seen that the echo amplitude of pure echo-signal is composed, failure echo letter has been compared
Number echo amplitude spectrum, waveform becomes more smooth, and interference signal significantly weakens.
In the technical solution of the present embodiment, by the failure echo-signal for obtaining fault point；Failure echo-signal is carried out
Wave-average filtering obtains smooth echo-signal；The interference signal in smooth echo-signal is filtered out, pure echo-signal is obtained；It is pure
Echo-signal can be truly reflected the electromagnetic wave echo waveform for the point reflection that is out of order, and solve for determining returning there are failure
The problem of wave signal is interfered by other electromagnetic wave signals.Therefore, the accurate of Weak fault signal detection can be improved in the present embodiment
Degree.
In another embodiment, the above-mentioned interference signal filtered out in smooth echo-signal obtains pure echo-signal, packet
It includes:
Acquisition system reference signal；Wave-average filtering is carried out to the system reference signal, obtains the smooth reference signal；
The smooth reference signal is subtracted from the smooth echo-signal, obtains pure echo-signal.
When 102 pairs of leakage cables of Weak fault signal detection system carry out fault detection, due to Weak fault signal detection system
The internal environment of system 102 is complex, even if leakage cable does not break down, Weak fault signal detection system 102 still can be with
Receive electromagnetic wave.Electromagnetic wave is as because emitting leakage signal, internal system line interface caused by isolation of system deficiency at this time
Or device interface standing wave deteriorates the composite electromagnetic that the reflection signal introduced, system noise, internal system radio frequency interference are formed by stacking
Wave.Above-mentioned composite electromagnetic has only been the absence of the electromagnetic wave signal that leakage cable is reflected compared with smooth echo-signal and leakage cable is made an uproar
Acoustic jamming.In turn, can using above-mentioned composite electromagnetic as benchmark, come eliminate in smooth echo-signal because of isolation of system not
Transmitting leakage signal caused by foot and internal system line interface or device interface standing wave deteriorate the reflection signal introduced, are put down
Sliding echo-signal.Therefore, above-mentioned composite electromagnetic is named as system reference signal.
In the specific implementation, Weak fault signal detection system 102 is obtained as because emitting leakage caused by isolation of system deficiency
It is dry that signal, internal system line interface or device interface standing wave deteriorate the reflection signal introduced, system noise, internal system radio frequency
It disturbs and is formed by stacking system reference signal；Wave-average filtering is carried out to system reference signal, removes the system noise in system reference signal
Sound and internal system radio frequency interference, obtain smooth reference signal；Smooth reference signal is subtracted from smooth echo-signal, removal is flat
In sliding echo-signal because isolation of system it is insufficient caused by emit leakage signal and internal system line interface or device interface is stayed
Wave deteriorates the reflection signal introduced, obtains pure echo-signal, pure echo-signal reflection leakage cable fault point institute reflection electromagnetic wave.
For example, firstly, establishing the signal model s (t) of failure echo-signal according to the constituent of failure echo-signal.
Therefore, the expression formula of failure echo-signal s (t) are as follows:
S (t)=d (t)+r (t)+n1(t)+rRF1(t)+s'(t)+n2(t)+rRF2(t)；
Wherein, d (t) is to emit leakage signal caused by isolation of system is insufficient, and r (t) is internal system line interface or device
Part port standing wave deteriorates the reflection echo signal introduced, n1It (t) is system noise: including environment white noise and thermal noise etc., rRF1
(t) be internal system radio frequency interference, s'(t) be fault point reflection echo, n2(t) noise received for leakage cable includes: ring
Border white noise and thermal noise etc., rRF2(t) radio frequency interference received for leakage cable.
Then, failure echo-signal is subjected to wave-average filtering, filter out internal system radio frequency interference in failure echo-signal,
The biggish noises of randomnesss such as radio frequency interference and system noise that leakage cable receives, obtain smooth echo-signal S (t), smooth to return
The expression formula of wave signal S (t) are as follows:
Wherein, N is that the cycle length of pulse is counted, and M is the average time of test.
Then, Weak fault signal detection system 102 is obtained as because emitting leakage signal caused by isolation of system deficiency, being
System interconnector interface or device interface standing wave deteriorate the reflection signal introduced, system noise, the superposition of internal system radio frequency interference
Into system reference signal；Wave-average filtering is carried out to system reference signal, remove the system noise in system reference signal and is
Internal radio frequency of uniting interference, obtains smooth reference signal S1(t), smooth reference signal S1(t) expression formula are as follows:
Wherein, si:loadIt (t) is the expression formula of system reference signal.
Finally, subtract smooth reference signal from smooth echo-signal, remove in smooth echo-signal because of isolation of system
Transmitting leakage signal caused by insufficient and internal system line interface or device interface standing wave deteriorate the reflection signal introduced, obtain
Pure echo-signalPure echo-signalReflection leakage cable fault point institute reflection electromagnetic wave.Pure echo-signal's
Expression formula are as follows:
The technical solution of the present embodiment obtains system reference signal by Weak fault signal detection system；To the system
Reference signal of uniting carries out wave-average filtering, obtains the smooth reference signal；It is subtracted from the smooth echo-signal described smooth
Reference signal, so as to accurately filter out the interference signal in smooth echo-signal, so that it is available more accurately pure
Net echo-signal.
In another embodiment, above-mentioned acquisition system reference signal, comprising:
The system of the Weak fault signal detection is connected into matched load, obtains system reference signal.
Wherein, matched load can be 50 ohm of load, be common a kind of device in communication equipment.In practical application
In, matched load can be used for electromagnetic wave absorption signal.
In the specific implementation, matched load is connected in the receiving end of Weak fault signal detection system 102, matched load can be inhaled
External all electromagnetic waves are received, therefore the receiving end of Weak fault signal detection system 102 is got because isolation of system deficiency is led
Transmitting leakage signal, internal system line interface or the device interface standing wave of cause deteriorate the reflection signal introduced, system noise, are
System internal radio frequency interference is formed by stacking system reference signal.
In the technical solution of the present embodiment, by the way that matched load is connected in the receiving end of Weak fault signal detection system,
External electromagnetic waves are absorbed by using matched load, to allow the receiving end of Weak fault signal detection system accurately
Emit leakage signal, internal system line interface or device interface standing wave caused by getting because of isolation of system deficiency and deteriorates introducing
Reflection signal, system noise, internal system radio frequency interference be formed by stacking system reference signal.
Before another embodiment, the failure echo-signal of above-mentioned acquisition leakage cable fault point, further includes:
Excitation detection signal is generated, and excitation detection signal is converted into transmitting detection signal；Send transmitting detection signal；
Fault point is received for the reflection echo signal of transmitting detection signal feedback；According to reflection echo signal, failure echo letter is obtained
Number.
In the specific implementation, being integrated with pumping signal module in Weak fault signal detection system 102, pumping signal module is raw
Signal is detected at excitation.Specifically, excitation detection signal is digital pulse signal, and the pulse duration is 44.5us (milli
Second), signal sampling rate is 184.32MSPS (Million Samples per Second).Further, Weak fault signal
102 pairs of excitation detection signals of detection system are modulated, and obtain transmitting detection signal.In Weak fault signal detection system 102
After generating transmitting detection signal, the radio-frequency switch module gated transmission channel integrated in Weak fault signal detection system 102,
Weak fault signal detection system 102 is in signal and sends state, and Weak fault signal detection system 102 is sent out to the cable to be checked that leaks hunting
Penetrate the radio wave for carrying transmitting detection signal.When Weak fault signal detection system 102 is completed to send transmitting detection signal
Task after, radio-frequency switch module gates receiving channel, and Weak fault signal detection system 102 is in signal reception state.
When there are fault points for leakage cable, transmitting detection signal will be reflected by leaking cable, form reflection echo signal.Weak fault signal
Detection system 102 receives leakage cable fault point for the reflection echo signal of transmitting detection signal feedback, and to reflection echo signal
It is converted, obtains failure echo-signal.
In the technical solution of the present embodiment, detection signal is motivated by generating, and excitation detection signal is converted into transmitting
Signal is detected, transmitting detection signal is retransmited；Fault point is received for the reflection echo signal of transmitting detection signal feedback；In turn
Make Weak fault signal detection system according to reflection echo signal, accurately obtains failure echo-signal.Meanwhile by faint
Integrated RF switch module in fault-signal detection system, radio-frequency switch module have gated transmission channel and gating receiving channel
Both of which receives the interference made an uproar at link bottom so as to which transmitting link docking is effectively reduced.
It is above-mentioned that excitation detection signal is converted into transmitting detection signal in another embodiment, comprising:
Digital-to-analogue conversion is carried out to excitation detection signal, obtains analog detection signal；Analog detection signal is simulated
Frequency-conversion processing obtains analog intermediate frequency detection signal；Analog intermediate frequency detection signal is subjected to Frequency mixing processing, obtains radio frequency detection letter
Number；Radio frequency test signal is subjected to signal amplification, obtains power amplifier radio frequency test signal；Power amplifier radio frequency test signal is subjected to time delay
Processing obtains transmitting detection signal.
Wherein, digital-to-analogue conversion, which refers to the process of, converts digital signals into analog signal, in practical applications, can be used
DAC (Digital to analog converter) chip, that is, digital analog converter realization converts digital signals into simulation
Signal.
Wherein, simulation upconversion process, which refers to, is converted to intermediate-freuqncy signal signal processing for zero intermediate frequency signals.
Wherein, signal amplification, which refers to, will improve the power level of radio frequency test signal.In practical applications, PA can be used
(Power Amplifier) module, that is, power amplifier realizes that the power to radio frequency test signal amplifies.
In the specific implementation, after Weak fault signal detection system 102 produces excitation detection signal, excitation inspection at this time
Survey signal is digital pulse signal.Then, digital-to-analogue conversion is carried out to excitation detection signal using DAC chip, obtains analog detection
Signal；Analog detection signal is zero intermediate frequency signals at this time, and analog detection signal is carried out mould by Weak fault signal detection system 102
Quasi- upconversion process obtains analog intermediate frequency detection signal.Specifically, the frequency of analog intermediate frequency detection signal can be 88.94MHz
(megahertz).Further, analog intermediate frequency detection signal is carried out Frequency mixing processing by Weak fault signal detection system 102, obtains frequency
The higher radio frequency test signal of rate, the frequency of signal can be depending on specific network needs at the same time.More specifically, radio frequency is examined
The frequency for surveying signal can be 850MHz.Since the power level of radio frequency test signal at this time is also not enough to carry out leakage cable fault point
Detection, therefore power amplification is carried out to radio frequency test signal using PA module, obtains power level higher power amplifier radio frequency inspection
Survey signal.More specifically, the power level of power amplifier radio frequency test signal can be 10dBm.Then, to power amplifier radio frequency test signal
It is filtered, obtains filtered radiofrequency signal.Time delay adjustment is carried out to the radiofrequency signal after filtering processing again, is finally obtained
Detection signal must be emitted.
In the technical solution of the present embodiment, by carrying out digital-to-analogue conversion to excitation detection signal, analog detection signal is obtained；
Analog detection signal is subjected to simulation upconversion process, obtains analog intermediate frequency detection signal；Analog intermediate frequency detection signal is carried out
Frequency mixing processing obtains radio frequency test signal；Radio frequency test signal is subjected to signal amplification, and then obtains stable transmitting detection letter
Number, after time delay processing, so as to ensure that such Weak fault signal detection system can be stablized effectively to weak signal
It is detected.
It is above-mentioned according to reflection echo signal in another embodiment, obtain failure echo-signal, comprising:
It will reflect back into wave signal and carry out time delay processing conversion, obtain pretreatment rf echo signal；Pretreatment radio frequency is returned
Wave signal is converted to echo signal of intermediate frequency；Echo signal of intermediate frequency is subjected to analog-to-digital conversion, obtains the first digital echo signal；By
One digital echo signal carries out sample rate variation, obtains the second digital echo signal；Second digital echo signal is subjected to low pass
Filtering, obtains the failure echo-signal of fault point.
Wherein, analog-to-digital conversion, which refers to the process of, converts analog signals into digital signal, in practical applications, can be used
ADC (Analog to digital converter) chip, that is, analog-digital converter realization converts analog signals into number
Signal.
In the specific implementation, Weak fault signal detection system 102 carries out signal filtering processing to reflection echo signal, obtain
Filtering reflective echo-signal, and filtering reflective echo-signal progress time delay processing is converted to pretreatment rf echo signal；
Weak fault signal detection system 102 will pre-process rf echo signal and be converted to echo signal of intermediate frequency, and then convenient for faint event
Hinder the next data processing of signal detection system 102.Specifically, echo signal of intermediate frequency is analog signal, and the frequency of signal is
88.94MHz and.Secondly, echo signal of intermediate frequency is converted to the first digital echo signal using ADC chip, and digital by first
Echo-signal carries out sample rate variation, obtains the second digital echo signal.Specifically, the sample rate of ADC chip is
245.76MSPS.Finally, the second digital echo signal is carried out low-pass filtering by Weak fault signal detection system 102, leaked
The failure echo-signal of cable fault point.
In the technical solution of the present embodiment, it will reflect back into wave signal progress time delay processing and be converted to echo signal of intermediate frequency；It will
Echo signal of intermediate frequency carries out analog-to-digital conversion, obtains the first digital echo signal；First digital echo signal is subjected to sample rate change
Change, obtains the second digital echo signal；The second digital echo signal is subjected to low-pass filtering again, so as to filter out reflection echo
The bandwidth external noise and interference signal carried in signal has obtained relatively pure failure echo-signal.
It is above-mentioned that the pretreatment rf echo signal is converted into echo signal of intermediate frequency in another embodiment, comprising:
Pretreatment rf echo signal is subjected to signal amplification, obtains amplification echo-signal；Echo-signal will be amplified and be
Local oscillator of uniting carries out Frequency mixing processing, obtains echo signal of intermediate frequency.
Wherein, system local oscillator can be the oscillator of internal system.In practical application, oscillator is for generating and amplifying back
The electromagnetic wave that wave signal is mixed.
Due to have passed through the transmitting of leakage cable fault point, the signal power level of reflection echo signal will receive influence and subtract
It is low.Therefore, it is necessary to improve the signal power level of reflection echo signal.
In the specific implementation, using LNA (Low Noise Amplifier) unit, that is, low-noise amplifier to pretreatment radio frequency
Echo-signal carries out signal and amplifies to obtain amplification echo-signal.Amplification echo-signal is radiofrequency signal.Will amplification echo-signal with
The oscillator of internal system carries out Frequency mixing processing, echo signal of intermediate frequency is obtained, consequently facilitating subsequent Weak fault signal detection system
Echo signal of intermediate frequency is carried out analog-to-digital conversion by system 102.
In the technical solution of the present embodiment, signal amplification is carried out by the way that rf echo signal will be pre-processed, obtains amplifying back
Wave signal；And echo-signal and system local oscillator progress Frequency mixing processing will be amplified, echo signal of intermediate frequency is obtained, consequently facilitating subsequent micro-
Echo signal of intermediate frequency is carried out analog-to-digital conversion by weak fault-signal detection system.
It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application,
Above-mentioned Weak fault signal detection system can also be applied in the fault detection of the reception devices such as cable, antenna, these
Belong to the protection scope of the application.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
It should be understood that although each step in the flow chart of Fig. 2 is successively shown according to the instruction of arrow, this
A little steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly state otherwise herein, these steps
It executes there is no the limitation of stringent sequence, these steps can execute in other order.Moreover, at least part in Fig. 2
Step may include that perhaps these sub-steps of multiple stages or stage are executed in synchronization to multiple sub-steps
It completes, but can execute at different times, the execution sequence in these sub-steps or stage, which is also not necessarily, successively to be carried out,
But it can be executed in turn or alternately at least part of the sub-step or stage of other steps or other steps.
In one embodiment, as shown in figure 3, providing a kind of Weak fault signal supervisory instrument, comprising: obtain module
310, wave-average filtering module 320 and module 330 is filtered out, in which:
Module 310 is obtained, for obtaining the failure echo-signal of fault point；The failure echo-signal is returned for primary fault
What wave signal was handled by group delay；
Wave-average filtering module 320 obtains smooth echo-signal for carrying out wave-average filtering to the failure echo-signal；
Module 330 is filtered out, for filtering out the interference signal in the smooth echo-signal, obtains pure echo-signal；Institute
Pure echo-signal is stated for determining the fault message of fault point.
In one embodiment, module 330 is filtered out in a kind of above-mentioned Weak fault signal supervisory instrument, comprising: base
Calibration signal acquiring unit, wave-average filtering unit and filter out unit, in which:
Reference signal acquiring unit, for obtaining system reference signal；Wave-average filtering unit, for the system benchmark
Signal carries out wave-average filtering, obtains the smooth reference signal；Unit is filtered out, for subtracting institute from the smooth echo-signal
Smooth reference signal is stated, pure echo-signal is obtained.
In one embodiment, module 330 is filtered out in a kind of above-mentioned Weak fault signal supervisory instrument, further includes:
Reference signal generation unit is obtained for the system of the leakage cable Weak fault signal detection to be connected matched load
To system reference signal.
In one embodiment, above-mentioned a kind of Weak fault signal supervisory instrument, further includes: generation module sends mould
Block, receiving module and failure echo-signal obtain module, in which:
Generation module is converted to transmitting detection signal for generating excitation detection signal, and by excitation detection signal；
Sending module, for sending the transmitting detection signal；Receiving module is detected for receiving the fault point for the transmitting
The reflection echo signal of signal feedback；Failure echo-signal obtains module, described for obtaining according to the reflection echo signal
Failure echo-signal.
In one embodiment, the generation module in a kind of above-mentioned Weak fault signal supervisory instrument, comprising: digital-to-analogue turns
Change unit, upconverting unit, mixing unit, signal amplification unit and time delay elements, in which:
D/A conversion unit obtains analog detection signal for carrying out digital-to-analogue conversion to excitation detection signal；Upper change
Frequency unit obtains analog intermediate frequency detection signal for the analog detection signal to be carried out simulation upconversion process；Mixing is single
Member obtains radio frequency test signal for analog intermediate frequency detection signal to be carried out Frequency mixing processing；Signal amplification unit is used for
The radio frequency test signal is subjected to signal amplification, obtains the transmitting detection signal；Time delay elements, for penetrating the power amplifier
Frequency detection signal carries out time delay processing, obtains the transmitting detection signal.
In one embodiment, the failure echo-signal in a kind of above-mentioned Weak fault signal supervisory instrument obtains mould
Block, comprising: time delay elements, signal conversion unit, AD conversion unit, sample rate change unit and low-pass filter unit, in which:
Time delay elements obtain pretreatment radio-frequency echo wave letter for the reflection echo signal to be carried out time delay processing conversion
Number；Signal conversion unit, for the pretreatment rf echo signal to be converted to echo signal of intermediate frequency；AD conversion unit,
For the echo signal of intermediate frequency to be carried out analog-to-digital conversion, the first digital echo signal is obtained；Sample rate change unit, being used for will
First digital echo signal carries out sample rate variation, obtains the second digital echo signal；Low-pass filter unit is used for institute
It states the second digital echo signal and carries out low-pass filtering, obtain the failure echo-signal of the leakage cable fault point.
In one embodiment, the signal conversion unit in a kind of above-mentioned Weak fault signal supervisory instrument, further includes:
Signal amplification unit and Frequency mixing processing unit, in which:
Signal amplification unit obtains amplification echo letter for the pretreatment rf echo signal to be carried out signal amplification
Number；Frequency mixing processing unit obtains intermediate frequency echo letter for the amplification echo-signal and system local oscillator to be carried out Frequency mixing processing
Number.
Specific about leakage cable fault detection means limits the limit that may refer to above for leakage cable fault detection method
Fixed, details are not described herein.Modules in above-mentioned leakage cable fault detection means can fully or partially through software, hardware and its
Combination is to realize.Above-mentioned each module can be embedded in the form of hardware or independently of in the processor in computer equipment, can also be with
It is stored in the memory in computer equipment in a software form, in order to which processor calls the above modules of execution corresponding
Operation.
In one embodiment, a kind of computer equipment is provided, which can be terminal, internal structure
Figure can be as shown in Figure 4.The computer equipment includes processor, the memory, network interface, display connected by system bus
Screen and input unit.Wherein, the processor of the computer equipment is for providing calculating and control ability.The computer equipment is deposited
Reservoir includes non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system and computer journey
Sequence.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.The calculating
The network interface of machine equipment is used to communicate with external terminal by network connection.When the computer program is executed by processor with
Realize a kind of Detection method of weak fault signal.The display screen of the computer equipment can be liquid crystal display or electric ink
Display screen, the input unit of the computer equipment can be the touch layer covered on display screen, be also possible to outside computer equipment
Key, trace ball or the Trackpad being arranged on shell can also be external keyboard, Trackpad or mouse etc..
It will be understood by those skilled in the art that structure shown in Fig. 4, only part relevant to application scheme is tied
The block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipment
It may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
In one embodiment, a kind of computer equipment, including memory and processor are provided, is stored in memory
Computer program, the processor perform the steps of when executing computer program
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal passes through group delay
What processing obtained；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；
The pure echo-signal is used to determine the fault message of fault point.
In one embodiment, it is also performed the steps of when processor executes computer program
Acquisition system reference signal；Wave-average filtering is carried out to the system reference signal, obtains the smooth reference signal；
The smooth reference signal is subtracted from the smooth echo-signal, obtains pure echo-signal.
In one embodiment, it is also performed the steps of when processor executes computer program by the faint event of the leakage cable
The system for hindering signal detection connects matched load, obtains system reference signal.
In one embodiment, it is also performed the steps of when processor executes computer program
Excitation detection signal is generated, and excitation detection signal is converted into transmitting detection signal；Send the transmitting
Detect signal；The fault point is received for the reflection echo signal of the transmitting detection signal feedback；It is reflected back according to described
Wave signal obtains the failure echo-signal.
In one embodiment, it is also performed the steps of when processor executes computer program
Digital-to-analogue conversion is carried out to excitation detection signal, obtains analog detection signal；By the analog detection signal into
Row simulation upconversion process obtains analog intermediate frequency detection signal；Analog intermediate frequency detection signal is subjected to Frequency mixing processing, is obtained
Radio frequency test signal；The radio frequency test signal is subjected to signal amplification, obtains the power amplifier radio frequency test signal；By the function
It puts radio frequency test signal and carries out time delay processing, obtain the transmitting detection signal.
In one embodiment, it is also performed the steps of when processor executes computer program
The reflection echo signal is subjected to time delay processing conversion, obtains pretreatment rf echo signal；By the pre- place
Reason rf echo signal is converted to echo signal of intermediate frequency；The echo signal of intermediate frequency is subjected to analog-to-digital conversion, obtains the first number
Echo-signal；First digital echo signal is subjected to sample rate variation, obtains the second digital echo signal；By described second
Digital echo signal carries out low-pass filtering, obtains the failure echo-signal of the fault point.
In one embodiment, it is also performed the steps of when processor executes computer program
The pretreatment rf echo signal is subjected to signal amplification, obtains amplification echo-signal；By the amplification echo
Signal and system local oscillator carry out Frequency mixing processing, obtain echo signal of intermediate frequency.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal passes through group delay
What processing obtained；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；
The pure echo-signal is used to determine the fault message of fault point.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Acquisition system reference signal；Wave-average filtering is carried out to the system reference signal, obtains the smooth reference signal；
The smooth reference signal is subtracted from the smooth echo-signal, obtains pure echo-signal.
In one embodiment, it is also performed the steps of when computer program is executed by processor the leakage cable is faint
The system of fault-signal detection connects matched load, obtains system reference signal.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Excitation detection signal is generated, and excitation detection signal is converted into transmitting detection signal；Send the transmitting
Detect signal；The fault point is received for the reflection echo signal of the transmitting detection signal feedback；It is reflected back according to described
Wave signal obtains the failure echo-signal.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Digital-to-analogue conversion is carried out to excitation detection signal, obtains analog detection signal；By the analog detection signal into
Row simulation upconversion process obtains analog intermediate frequency detection signal；Analog intermediate frequency detection signal is subjected to Frequency mixing processing, is obtained
Radio frequency test signal；The radio frequency test signal is subjected to signal amplification, obtains the power amplifier radio frequency test signal；By the function
It puts radio frequency test signal and carries out time delay processing, obtain the transmitting detection signal.
In one embodiment, it is also performed the steps of when computer program is executed by processor
The reflection echo signal is subjected to time delay processing conversion, obtains pretreatment rf echo signal；By the pre- place
Reason rf echo signal is converted to echo signal of intermediate frequency；The echo signal of intermediate frequency is subjected to analog-to-digital conversion, obtains the first number
Echo-signal；First digital echo signal is subjected to sample rate variation, obtains the second digital echo signal；By described second
Digital echo signal carries out low-pass filtering, obtains the failure echo-signal of the fault point.
In one embodiment, it is also performed the steps of when computer program is executed by processor
The pretreatment rf echo signal is subjected to signal amplification, obtains amplification echo-signal；By the amplification echo
Signal and system local oscillator carry out Frequency mixing processing, obtain echo signal of intermediate frequency.
Each embodiment that the application is deeply understood for the ease of those skilled in the art, below with reference to specific example into
Row explanation.
Fig. 7 is a kind of system block diagram of leakage cable fault detection method of the application in one embodiment, as shown in Figure 1,
Weak fault signal detection system in the embodiment of the present application may include FPGA module 701, the first frequency mixing module 702, first
Amplification module 703, T/R module 704, the second amplification module 705 and the second frequency mixing module 706.701 output end of FPGA module and
The connection of one frequency mixing module, 702 input terminal, 702 output end of the first frequency mixing module are connect with 703 input terminal of the first amplification module, and first
703 output end of amplification module is connect with 704 input terminal of T/R module, and 704 output end of T/R module is defeated with time delay processing module 705
Enter connection, the output end of time delay processing module 705 is connect with 706 input terminal of the second amplification module, the output of the second amplification module 706
End is connect with 707 input terminal of the second frequency mixing module, and 707 output end of the second frequency mixing module is connect with 701 input terminal of FPGA module.
Wherein, FPGA (Field-Programmable Gate Array), i.e. field programmable gate array, it is to pass
The product further developed on the basis of system programming device；It is as one of specific integrated circuit field semi-custom electricity
Road and occur, not only solved the deficiency of custom circuit, but also overcome the limited disadvantage of original programming device gate circuit number.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of Detection method of weak fault signal characterized by comprising
Obtain the failure echo-signal of fault point；The failure echo-signal is that primary fault echo-signal is handled by group delay
It obtains；
Wave-average filtering is carried out to the failure echo-signal, obtains smooth echo-signal；
The interference signal in the smooth echo-signal is filtered out, pure echo-signal is obtained；The pure echo-signal is for true
Determine the fault message of fault point.
2. the method according to claim 1, wherein the interference letter filtered out in the smooth echo-signal
Number, obtain pure echo-signal, comprising:
Acquisition system reference signal；
Wave-average filtering is carried out to the system reference signal, obtains the smooth reference signal；
The smooth reference signal is subtracted from the smooth echo-signal, obtains pure echo-signal.
3. according to the method described in claim 2, it is characterized in that, the acquisition system reference signal, comprising:
The system of the Weak fault signal detection is connected into matched load, obtains system reference signal.
4. the method according to claim 1, wherein being gone back before the failure echo-signal for obtaining fault point
Include:
Excitation detection signal is generated, and excitation detection signal is converted into transmitting detection signal；
Send the transmitting detection signal；
The fault point is received for the reflection echo signal of the transmitting detection signal feedback；
According to the reflection echo signal, the failure echo-signal is obtained.
5. according to the method described in claim 4, it is characterized in that, described be converted to transmitting detection for excitation detection signal
Signal, comprising:
Digital-to-analogue conversion is carried out to excitation detection signal, obtains analog detection signal；
The analog detection signal is subjected to simulation upconversion process, obtains analog intermediate frequency detection signal；
Analog intermediate frequency detection signal is subjected to Frequency mixing processing, obtains radio frequency test signal；
The radio frequency test signal is subjected to signal amplification, obtains the power amplifier radio frequency test signal；
The power amplifier radio frequency test signal is subjected to time delay processing, obtains the transmitting detection signal.
6. according to the method described in claim 4, it is characterized in that, described according to the reflection echo signal, obtain it is described therefore
Hinder echo-signal, comprising:
The reflection echo signal is subjected to time delay processing conversion, obtains pretreatment rf echo signal；
The pretreatment rf echo signal is converted into echo signal of intermediate frequency；
The echo signal of intermediate frequency is subjected to analog-to-digital conversion, obtains the first digital echo signal；
First digital echo signal is subjected to sample rate variation, obtains the second digital echo signal；
Second digital echo signal is subjected to low-pass filtering, obtains the failure echo-signal of the fault point.
7. according to the method described in claim 6, it is characterized in that, described be converted to the pretreatment rf echo signal
Frequency echo-signal, comprising:
The pretreatment rf echo signal is subjected to signal amplification, obtains amplification echo-signal；
The amplification echo-signal and system local oscillator are subjected to Frequency mixing processing, obtain echo signal of intermediate frequency.
8. a kind of Weak fault signal supervisory instrument, which is characterized in that described device includes:
Module is obtained, for obtaining the failure echo-signal of fault point；The failure echo-signal is primary fault echo-signal
It is handled by group delay
Wave-average filtering module obtains smooth echo-signal for carrying out wave-average filtering to the failure echo-signal；
Module is filtered out, for filtering out the interference signal in the smooth echo-signal, obtains pure echo-signal；Described pure time
Wave signal is used to determine the fault message of fault point.
9. a kind of computer equipment, including memory and processor, the memory are stored with computer program, feature exists
In the step of processor realizes any one of claims 1 to 7 the method when executing the computer program.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of method described in any one of claims 1 to 7 is realized when being executed by processor.
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