CN109379148B - Weak fault signal detection method and device, computer equipment and storage medium - Google Patents
Weak fault signal detection method and device, computer equipment and storage medium Download PDFInfo
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- CN109379148B CN109379148B CN201811422558.3A CN201811422558A CN109379148B CN 109379148 B CN109379148 B CN 109379148B CN 201811422558 A CN201811422558 A CN 201811422558A CN 109379148 B CN109379148 B CN 109379148B
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Abstract
The application relates to a weak fault signal detection method, a weak fault signal detection device, computer equipment and a storage medium. The method comprises the following steps: acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay; carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal; filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point. The method can solve the problem of low detection accuracy of the existing weak fault signal detection method.
Description
Technical Field
The present application relates to the field of signal detection technologies, and in particular, to a weak fault signal detection method and apparatus, a computer device, and a storage medium.
Background
The leaky cable is used as a supplement in a wireless coverage solution, and is particularly suitable for areas with limited wireless signal propagation, such as highway tunnels, railway tunnels, urban rails, high-speed rails and the like. As the only carrier for bearing signal transmission in the wireless network leaky cable covering system, the reliability of the system is crucial to the network.
Usually, the laying distance of the leaky cable is different from hundreds of meters to several kilometers, if the leaky cable is maintained completely by manpower, the leaky cable fault detection is difficult to timely and accurately complete, the traditional test method adopts a receiving and transmitting switch technology and a circulator technology to realize the capture of a receiving and transmitting signal, and when the test distance is short, a weak echo signal is easily submerged by a circulator interference signal, so that the problem that the echo signal cannot be accurately obtained is caused.
Therefore, the existing weak fault signal detection method has the problem of low detection accuracy.
Disclosure of Invention
In view of the above, it is necessary to provide a leaky cable fault signal detection method, a leaky cable fault signal detection apparatus, a computer device, and a storage medium, which can improve the detection accuracy of a leaky cable fault signal.
A weak fault signal detection method, the method comprising:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
In one embodiment, the filtering the interference signal in the smoothed echo signal to obtain a clean echo signal includes:
acquiring a system reference signal;
carrying out waveform averaging on the system reference signal to obtain the smooth reference signal;
and subtracting the smooth reference signal from the smooth echo signal to obtain a pure echo signal.
In one embodiment, the acquiring a system reference signal includes:
and connecting the system for detecting the weak fault signal with a matched load to obtain a system reference signal.
In one embodiment, before acquiring the fault echo signal of the leaky cable fault point, the method further includes:
generating an excitation detection signal and converting the excitation detection signal into an emission detection signal;
transmitting the emission detection signal;
receiving a reflected echo signal fed back by the fault point aiming at the emission detection signal;
and obtaining the fault echo signal according to the reflection echo signal.
In one embodiment, the converting the excitation detection signal into an emission detection signal includes:
performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal;
carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal;
carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal;
amplifying the radio frequency detection signal to obtain the power amplifier emission detection signal;
and carrying out time delay processing on the power amplifier emission detection signal to obtain the emission detection signal.
In one embodiment, the obtaining the fault echo signal according to the reflected echo signal includes:
performing time delay processing conversion on the reflected echo signal to obtain a preprocessed radio frequency echo signal;
converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal;
performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal;
carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal;
and carrying out low-pass filtering on the second digital echo signal to obtain the fault echo signal of the leaky cable fault point.
In one embodiment, the converting the preprocessed radio frequency echo signals into intermediate frequency echo signals includes:
performing signal amplification on the preprocessed radio frequency echo signal to obtain an amplified echo signal;
and carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
A weak fault signal detection apparatus, the apparatus comprising:
the acquisition module is used for acquiring a fault echo signal of a leaky cable fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
the waveform averaging module is used for carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
the filtering module is used for filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
According to the weak fault signal detection method, the weak fault signal detection device, the computer equipment and the storage medium, the fault echo signal of the fault point is obtained; carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal; filtering interference signals in the smoothed echo signals to obtain pure echo signals; the pure echo signal can truly reflect the waveform of the electromagnetic wave echo reflected by the fault point of the leaky cable, and the problem that the echo signal for determining the fault of the leaky cable is interfered by other electromagnetic wave signals is solved. Therefore, the method and the device can improve the accuracy of detecting the weak fault echo signals.
Drawings
FIG. 1 is a diagram illustrating an exemplary embodiment of a weak fault detection method;
FIG. 2 is a schematic flow chart illustrating a weak fault signal detection method according to an embodiment;
FIG. 3 is a block diagram of a weak fault signal detection apparatus according to an embodiment;
FIG. 4 is a diagram illustrating an internal structure of a computer device according to an embodiment;
FIG. 5 is an echo magnitude spectrum of a fault echo signal in one embodiment;
FIG. 6 is an echo magnitude spectrum of a clean echo signal in one embodiment;
fig. 7 is a system block diagram of a weak fault signal detection apparatus according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The weak fault signal detection method provided by the application can be applied to the application environment shown in fig. 1. The cable 104 may be a leaky coaxial cable, which has a structure substantially identical to that of a common coaxial cable and is composed of an inner conductor, an insulating medium, and an outer conductor with periodic slots. The weak fault signal detection system 102 transmits electromagnetic waves to the cable to be detected. When the cable has a failure point, for example, the outer skin is broken, deformed, etc. According to the transmission theory of electromagnetic waves, the electromagnetic waves cannot be completely conducted by the cable and then reflected back to the weak fault signal detection system 102, the weak fault signal detection system 102 analyzes the received electromagnetic waves to obtain the waveform of the reflected electromagnetic waves, and the fault of the cable is judged through the waveform characteristics.
In one embodiment, as shown in fig. 2, a weak fault signal detection method is provided, which is exemplified by the method applied to the weak fault signal detection system in fig. 1, and includes the following steps:
step 202, acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay. The fault echo signal may be a baseband signal reflected from a fault point to the weak fault signal detection system 102, and a signal spectrum of the fault echo signal includes a reflected echo signal of the fault point, environmental interference, system self interference, and the like.
In the specific implementation, a signal receiving end of the weak fault signal detection system 102 is opened, and due to a complex system environment, the weak fault signal detection system 102 receives electromagnetic waves formed by superimposing signals such as emission leakage interference signals caused by insufficient system isolation, reflected signals introduced by standing wave deterioration of a system internal connection interface or a device port, system noise, system internal radio frequency interference, reflected echo signals of a fault point, noise received by a cable, radio frequency interference received by the cable and the like, and the electromagnetic waves include electromagnetic waves reflected back by the fault point, so that the electromagnetic waves are named as fault echo signals. The weak fault signal detection system 102 is provided with a delay processing unit, so that when the weak fault signal detection system 102 receives an initial fault echo signal, the initial fault echo signal is subjected to group delay processing to obtain a fault echo signal, and thus a transmission leakage interference signal caused by insufficient system isolation can be separated from a reflection echo signal of a fault point on a time scale.
And step 204, carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal.
Because the working frequency bands of the leaky cable signals are relatively independent, the local property of leaky cable transmission and the isolation of radio frequency lines in equipment are relatively high, the radio frequency interference in a system and the radio frequency interference received by the leaky cable are very small, and the leaky cable signal transmission system has the characteristic of randomness. Similarly, the system noise also has randomness. Therefore, the random noises can be averaged by a plurality of groups of fault echo signals, so that the random noises are weakened or even eliminated.
In a specific implementation, the weak fault signal detection system 102 sends multiple groups of detection signals to the leaky cable, fault points of the leaky cable all reflect the multiple groups of detection signals, and a receiving end of the weak fault signal detection system 102 acquires multiple groups of fault echo signals; after the weak fault signal detection system 102 obtains a plurality of sets of fault echo signals, the waveform of the plurality of sets of fault echo signals can be averaged by calculating the mean value of the plurality of sets of fault echo signals. After the waveform averaging, an echo signal from which noise is removed is obtained. Since the echo signal from which the noise is removed is generally a relatively smooth waveform, the echo signal from which the noise is removed may be named a smooth echo signal.
Step 206, filtering interference signals in the smoothed echo signals to obtain pure echo signals; the clean echo signal is used to determine fault information of the fault point.
After step 204, the system internal radio frequency interference, the radio frequency interference received by the leaky cable and the system noise in the fault echo signal are eliminated, and a smooth echo signal is obtained. However, the smoothed echo signal is still a composite signal consisting of the transmit leakage signal, the reflected signal introduced by the system interconnect interface or device port standing wave degradation, and the reflected echo signal. With respect to the reflected echo signal, both the transmitted leakage signal and the reflected signal introduced by the standing wave degradation of the system interconnect interface or device port affect the weak fault signal detection system 102 to determine the pure echo signal. Thus, the transmit leakage signal and the reflected signal introduced by the system interconnect interface or device port standing wave degradation are collectively referred to as interference signals. And filtering interference signals in the smooth echo signals to obtain pure echo signals, wherein the pure echo signals reflect electromagnetic waves reflected by the leaky cable fault points.
In the specific implementation, after the weak fault signal detection system 102 performs waveform averaging on the fault echo signal to obtain a smooth echo signal, the weak fault signal detection system 102 filters out a leakage signal caused by insufficient system isolation from the smooth echo signal, and an echo signal introduced by the system internal connection interface or device port standing wave deterioration can obtain a pure echo signal capable of reflecting the electromagnetic wave reflected by the leaky cable fault point by filtering out an interference signal in the smooth echo signal.
Fig. 5 is an echo magnitude spectrum of a fault echo signal in one embodiment, and fig. 6 is an echo magnitude spectrum of a clean echo signal in one embodiment. As can be seen from the comparison of the two drawings, the echo amplitude spectrum of the pure echo signal is smoother than that of the fault echo signal, and the waveform is smoother, so that the interference signal is greatly weakened.
In the technical scheme of the embodiment, a fault echo signal of a fault point is obtained; carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal; filtering interference signals in the smoothed echo signals to obtain pure echo signals; the pure echo signal can truly reflect the echo waveform of the electromagnetic wave reflected by the fault point, and the problem that the echo signal with the fault is interfered by other electromagnetic wave signals is solved. Therefore, the method and the device can improve the accuracy of weak fault signal detection.
In another embodiment, the filtering the interference signal in the smoothed echo signal to obtain a clean echo signal includes:
acquiring a system reference signal; carrying out waveform averaging on the system reference signal to obtain the smooth reference signal; and subtracting the smooth reference signal from the smooth echo signal to obtain a pure echo signal.
When the weak fault signal detection system 102 performs fault detection on the leaky cable, the weak fault signal detection system 102 may receive electromagnetic waves even if the leaky cable does not have a fault because the internal environment of the weak fault signal detection system 102 is complex. At the moment, the electromagnetic wave is a composite electromagnetic wave formed by superposing a transmission leakage signal caused by insufficient system isolation, a reflected signal introduced by the deterioration of a system internal connecting line interface or a device port standing wave, system noise and system internal radio frequency interference. Compared with the smooth echo signal, the composite electromagnetic wave just lacks the electromagnetic wave signal reflected by the leaky cable and the noise interference of the leaky cable. Furthermore, the composite electromagnetic wave can be used as a reference to eliminate a transmission leakage signal caused by insufficient system isolation and a reflection signal caused by the deterioration of a standing wave at an internal connecting line interface or a device port of a system in the smooth echo signal, so as to obtain the smooth echo signal. Therefore, the composite electromagnetic wave is named as a system reference signal.
In specific implementation, the weak fault signal detection system 102 obtains a system reference signal formed by superimposing a transmission leakage signal caused by insufficient system isolation, a reflected signal introduced by the deterioration of a system internal connection interface or a device port standing wave, system noise and system internal radio frequency interference; carrying out waveform averaging on the system reference signal, and removing system noise in the system reference signal and radio frequency interference inside the system to obtain a smooth reference signal; and subtracting the smooth reference signal from the smooth echo signal, and removing a transmitting leakage signal caused by insufficient system isolation and a reflected signal caused by the standing wave deterioration of a system internal connection interface or a device port in the smooth echo signal to obtain a pure echo signal, wherein the pure echo signal reflects the electromagnetic wave reflected by a leaky cable fault point.
For example, first, a signal model s (t) of the failure echo signal is created based on the component of the failure echo signal. Therefore, the expression of the fault echo signal s (t) is:
s(t)＝d(t)+r(t)+n1(t)+rRF1(t)+s'(t)+n2(t)+rRF2(t)；
wherein d (t) is a transmission leakage signal caused by insufficient system isolation, r (t) is a reflection echo signal introduced by the standing wave deterioration of a system internal connecting line interface or a device port, n1(t) is system noise: including ambient white noise and thermal noise, etc., rRF1(t) is the system internal radio frequency interference, s' (t) is the reflected echo of the fault point, n2(t) noise received for leaky cables includes: ambient white noise and thermal noise, etc., rRF2And (t) radio frequency interference received by the leaky cable.
Then, waveform averaging is carried out on the fault echo signal, noise with high randomness, such as system internal radio frequency interference, radio frequency interference received by a leaky cable, system noise and the like in the fault echo signal, is filtered, and a smooth echo signal S (t) is obtained, wherein the expression of the smooth echo signal S (t) is as follows:
wherein, N is the number of the periodic length points of the pulse, and M is the average number of times of the test.
Then, the weak fault signal detection system 102 acquires a system reference signal formed by superimposing a transmission leakage signal caused by insufficient system isolation, a reflected signal introduced by the deterioration of a system internal connection line interface or a device port standing wave, system noise and system internal radio frequency interference; carrying out waveform averaging on the system reference signal, removing system noise and system internal radio frequency interference in the system reference signal, and obtaining a smooth reference signal S1(t), smoothing the reference signal S1The expression of (t) is:
wherein s isi:load(t) is an expression of the system reference signal.
Finally, the smooth reference signal is subtracted from the smooth echo signal, and a transmission leakage signal caused by insufficient system isolation and a reflection signal caused by the deterioration of a standing wave of a system internal connecting line interface or a device port in the smooth echo signal are removed, so that a pure echo signal is obtained
Clean echo signal
Reflecting the electromagnetic wave reflected by the fault point of the leaky cable. Clean echo signal
The expression of (a) is:
according to the technical scheme of the embodiment, a system reference signal is obtained through a weak fault signal detection system; carrying out waveform averaging on the system reference signal to obtain the smooth reference signal; and subtracting the smooth reference signal from the smooth echo signal, so that interference signals in the smooth echo signal can be accurately filtered, and a more accurate pure echo signal can be obtained.
In another embodiment, the acquiring a system reference signal includes:
and connecting the system for detecting the weak fault signal with a matched load to obtain a system reference signal.
The matching load may be a 50 ohm load, which is a common device in communication equipment. In practical applications, a matched load may be used to absorb electromagnetic wave signals.
In the specific implementation, a receiving end of the weak fault signal detection system 102 is connected to a matching load, and the matching load can absorb all external electromagnetic waves, so that the receiving end of the weak fault signal detection system 102 obtains a system reference signal formed by superimposing a transmission leakage signal caused by insufficient system isolation, a reflection signal introduced by the deterioration of a system internal connection interface or a device port standing wave, system noise and system internal radio frequency interference.
In the technical scheme of this embodiment, the receiving end of the weak fault signal detection system is connected to the matching load, and the matching load is used to absorb external electromagnetic waves, so that the receiving end of the weak fault signal detection system can accurately obtain a system reference signal formed by superimposing a transmission leakage signal caused by insufficient system isolation, a reflected signal introduced by deterioration of a system interconnection interface or a device port standing wave, system noise, and system internal radio frequency interference.
In another embodiment, before acquiring the fault echo signal of the leaky cable fault point, the method further includes:
generating an excitation detection signal and converting the excitation detection signal into an emission detection signal; transmitting an emission detection signal; receiving a reflected echo signal fed back by a fault point aiming at the emission detection signal; and obtaining a fault echo signal according to the reflected echo signal.
In a specific implementation, an excitation signal module is integrated in the weak fault signal detection system 102, and the excitation signal module generates an excitation detection signal. Specifically, the excitation detection signal is a digital pulse signal having a pulse duration of 44.5us (milliseconds) and a signal sampling rate of 184.32msps (million Samples per second). Further, the weak fault signal detection system 102 modulates the excitation detection signal to obtain an emission detection signal. After the weak fault signal detection system 102 generates the emission detection signal, the radio frequency switch module integrated in the weak fault signal detection system 102 gates the emission channel, the weak fault signal detection system 102 is in a signal sending state, and the weak fault signal detection system 102 emits the radio wave carrying the emission detection signal to the leaky cable to be detected. After the weak fault signal detection system 102 completes the task of sending the transmission detection signal, the radio frequency switch module gates the receiving channel, and the weak fault signal detection system 102 is in a signal receiving state. When the leaky cable has a fault point, the leaky cable can reflect the emission detection signal to form a reflection echo signal. The weak fault signal detection system 102 receives a reflected echo signal fed back by a leaky cable fault point aiming at the emission detection signal, and converts the reflected echo signal to obtain a fault echo signal.
In the technical scheme of the embodiment, the excitation detection signal is generated, converted into the emission detection signal, and then sent; receiving a reflected echo signal fed back by a fault point aiming at the emission detection signal; and then the weak fault signal detection system can accurately obtain the fault echo signal according to the reflected echo signal. Meanwhile, the radio frequency switch module is integrated in the weak fault signal detection system and has two modes of gating a transmitting channel and gating a receiving channel, so that the interference of a transmitting link on the bottom noise of the receiving link can be effectively reduced.
In another embodiment, the converting the excitation detection signal into the emission detection signal includes:
performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal; carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal; carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal; amplifying the radio frequency detection signal to obtain a power amplifier radio frequency detection signal; and carrying out time delay processing on the power amplifier radio frequency detection signal to obtain a transmitting detection signal.
In practical applications, a dac (digital to analog converter) chip, that is, a digital to analog converter, may be used to convert a digital signal into an analog signal.
The analog up-conversion processing refers to a processing process of converting a zero intermediate frequency signal into an intermediate frequency signal.
Wherein, signal amplification means that the power level of the radio frequency detection signal is increased. In practical applications, the pa (power amplifier) module, i.e., the power amplifier, may be used to amplify the power of the rf detection signal.
In a specific implementation, after the weak fault signal detection system 102 generates the excitation detection signal, the excitation detection signal is a digital pulse signal. Then, performing digital-to-analog conversion on the excitation detection signal by using a DAC chip to obtain an analog detection signal; at this time, the analog detection signal is a zero intermediate frequency signal, and the weak fault signal detection system 102 performs analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal. Specifically, the frequency of the analog intermediate frequency detection signal may be 88.94MHz (megahertz). Further, the weak fault signal detection system 102 performs frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal with a higher frequency, and meanwhile, the frequency of the signal may be determined according to the specific network requirement. More specifically, the frequency of the radio frequency detection signal may be 850 MHz. Because the power level of the radio frequency detection signal at this moment is not enough to detect the leaky cable fault point, the PA module is used for carrying out power amplification on the radio frequency detection signal to obtain a power amplifier radio frequency detection signal with higher power level. More specifically, the power level of the power amplifier rf detection signal may be 10 dBm. And then, filtering the power amplifier radio frequency detection signal to obtain a filtered radio frequency signal. And then, carrying out time delay adjustment on the radio frequency signal after filtering processing, and finally obtaining a transmitting detection signal.
In the technical scheme of the embodiment, an analog detection signal is obtained by performing digital-to-analog conversion on an excitation detection signal; carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal; carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal; the radio frequency detection signal is amplified to obtain a stable emission detection signal, and the stable emission detection signal is subjected to time delay processing, so that the weak fault signal detection system can be ensured to stably and effectively detect the weak signal.
In another embodiment, the obtaining the fault echo signal according to the reflected echo signal includes:
performing time delay processing conversion on the reflected echo signal to obtain a preprocessed radio frequency echo signal; converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal; performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal; carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal; and carrying out low-pass filtering on the second digital echo signal to obtain a fault echo signal of a fault point.
In practical applications, an adc (analog to digital converter) chip, that is, an analog to digital converter, may be used to convert an analog signal into a digital signal.
In a specific implementation, the weak fault signal detection system 102 performs signal filtering processing on the reflected echo signal to obtain a filtered reflected echo signal, and performs delay processing conversion on the filtered reflected echo signal to obtain a preprocessed radio frequency echo signal; the weak fault signal detection system 102 converts the preprocessed radio frequency echo signals into intermediate frequency echo signals, thereby facilitating the subsequent data processing of the weak fault signal detection system 102. Specifically, the intermediate frequency echo signal is an analog signal, and the frequency of the signal is 88.94 MHz. Secondly, the ADC chip is used for converting the intermediate frequency echo signal into a first digital echo signal, and the sampling rate of the first digital echo signal is changed to obtain a second digital echo signal. Specifically, the sampling rate of the ADC chip is 245.76 MSPS. Finally, the weak fault signal detection system 102 performs low-pass filtering on the second digital echo signal to obtain a fault echo signal of the leaky cable fault point.
In the technical scheme of the embodiment, the reflected echo signal is subjected to time delay processing and converted into an intermediate frequency echo signal; performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal; carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal; and then the second digital echo signal is subjected to low-pass filtering, so that bandwidth external noise and interference signals carried in the reflected echo signal can be filtered, and a relatively pure fault echo signal is obtained.
In another embodiment, the converting the preprocessed radio frequency echo signals into intermediate frequency echo signals includes:
amplifying the preprocessed radio frequency echo signals to obtain amplified echo signals; and carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
The system local oscillator may be an oscillator inside the system. In practice, an oscillator is used to generate an electromagnetic wave that is mixed with the amplified echo signal.
The signal power level of the reflected echo signal is affected and reduced by the transmission through the leaky cable fault point. Therefore, it is necessary to increase the signal power level of the reflected echo signal.
In specific implementation, an lna (low Noise amplifier) unit, namely a low Noise amplifier, is used to amplify the signal of the preprocessed radio frequency echo signal to obtain an amplified echo signal. The echo signal is amplified to a radio frequency signal. The amplified echo signals are subjected to frequency mixing processing with an oscillator inside the system to obtain intermediate frequency echo signals, so that the intermediate frequency echo signals can be subjected to analog-to-digital conversion by the subsequent weak fault signal detection system 102.
In the technical scheme of the embodiment, the pre-processed radio frequency echo signal is subjected to signal amplification to obtain an amplified echo signal; and the amplified echo signals and a system local oscillator are subjected to frequency mixing processing to obtain intermediate frequency echo signals, so that the intermediate frequency echo signals can be conveniently subjected to analog-to-digital conversion by a subsequent weak fault signal detection system.
It should be noted that, for those skilled in the art, the above weak fault signal detection system can also be applied to fault detection of a receiving device such as a cable or an antenna without departing from the concept of the present application, and these embodiments are all within the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 3, there is provided a weak fault signal detection apparatus including: an acquisition module 310, a waveform averaging module 320, and a filtering module 330, wherein:
an obtaining module 310, configured to obtain a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
a waveform averaging module 320, configured to perform waveform averaging on the fault echo signal to obtain a smooth echo signal;
a filtering module 330, configured to filter an interference signal in the smoothed echo signal to obtain a pure echo signal; the pure echo signal is used for determining fault information of a fault point.
In an embodiment, the filtering module 330 in the weak fault signal detection apparatus includes: reference signal acquisition unit, waveform averaging unit and filtering unit, wherein:
a reference signal acquisition unit for acquiring a system reference signal; the waveform averaging unit is used for carrying out waveform averaging on the system reference signal to obtain the smooth reference signal; and the filtering unit is used for subtracting the smooth reference signal from the smooth echo signal to obtain a pure echo signal.
In an embodiment, the filtering module 330 in the weak fault signal detection apparatus further includes:
and the reference signal generating unit is used for connecting the system for detecting the leakage cable weak fault signal with a matched load to obtain a system reference signal.
In an embodiment, the weak fault signal detection apparatus further includes: the device comprises a generation module, a sending module, a receiving module and a fault echo signal acquisition module, wherein:
the generating module is used for generating an excitation detection signal and converting the excitation detection signal into an emission detection signal; a sending module, configured to send the emission detection signal; the receiving module is used for receiving a reflected echo signal fed back by the fault point aiming at the emission detection signal; and the fault echo signal acquisition module is used for obtaining the fault echo signal according to the reflected echo signal.
In an embodiment, the generating module in the weak fault signal detecting apparatus includes: digital-to-analog conversion unit, up-conversion unit, mixing unit, signal amplification unit and time delay unit, wherein:
the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal; the up-conversion unit is used for carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal; the frequency mixing unit is used for carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal; the signal amplification unit is used for carrying out signal amplification on the radio frequency detection signal to obtain the emission detection signal; and the time delay unit is used for carrying out time delay processing on the power amplifier radio frequency detection signal to obtain the emission detection signal.
In an embodiment, the above fault echo signal obtaining module in the weak fault signal detecting apparatus includes: time delay unit, signal conversion unit, analog-to-digital conversion unit, sampling rate change unit and low pass filter unit, wherein:
the time delay unit is used for carrying out time delay processing conversion on the reflection echo signal to obtain a preprocessed radio frequency echo signal; the signal conversion unit is used for converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal; the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal; the sampling rate change unit is used for changing the sampling rate of the first digital echo signal to obtain a second digital echo signal; and the low-pass filtering unit is used for performing low-pass filtering on the second digital echo signal to obtain the fault echo signal of the leaky cable fault point.
In an embodiment, the signal conversion unit in the weak fault signal detection apparatus further includes: a signal amplifying unit and a mixing processing unit, wherein:
the signal amplification unit is used for carrying out signal amplification on the preprocessed radio frequency echo signal to obtain an amplified echo signal; and the frequency mixing processing unit is used for carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
For the specific definition of the leaky cable fault detection device, reference may be made to the above definition of the leaky cable fault detection method, which is not described herein again. The modules in the leaky cable fault detecting device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 4. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a weak fault signal detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 4 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals;
the pure echo signal is used for determining fault information of a fault point.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
acquiring a system reference signal; carrying out waveform averaging on the system reference signal to obtain the smooth reference signal; and subtracting the smooth reference signal from the smooth echo signal to obtain a pure echo signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and connecting the system for detecting the weak fault signal of the leaky cable with a matched load to obtain a system reference signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
generating an excitation detection signal and converting the excitation detection signal into an emission detection signal; transmitting the emission detection signal; receiving a reflected echo signal fed back by the fault point aiming at the emission detection signal; and obtaining the fault echo signal according to the reflection echo signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal; carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal; carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal; amplifying the radio frequency detection signal to obtain the power amplifier radio frequency detection signal; and carrying out time delay processing on the power amplifier radio frequency detection signal to obtain the emission detection signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
performing time delay processing conversion on the reflected echo signal to obtain a preprocessed radio frequency echo signal; converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal; performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal; carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal; and carrying out low-pass filtering on the second digital echo signal to obtain the fault echo signal of the fault point.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
performing signal amplification on the preprocessed radio frequency echo signal to obtain an amplified echo signal; and carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals;
the pure echo signal is used for determining fault information of a fault point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a system reference signal; carrying out waveform averaging on the system reference signal to obtain the smooth reference signal; and subtracting the smooth reference signal from the smooth echo signal to obtain a pure echo signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: and connecting the system for detecting the weak fault signal of the leaky cable with a matched load to obtain a system reference signal.
In one embodiment, the computer program when executed by the processor further performs the steps of:
generating an excitation detection signal and converting the excitation detection signal into an emission detection signal; transmitting the emission detection signal; receiving a reflected echo signal fed back by the fault point aiming at the emission detection signal; and obtaining the fault echo signal according to the reflection echo signal.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal; carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal; carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal; amplifying the radio frequency detection signal to obtain the power amplifier radio frequency detection signal; and carrying out time delay processing on the power amplifier radio frequency detection signal to obtain the emission detection signal.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing time delay processing conversion on the reflected echo signal to obtain a preprocessed radio frequency echo signal; converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal; performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal; carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal; and carrying out low-pass filtering on the second digital echo signal to obtain the fault echo signal of the fault point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing signal amplification on the preprocessed radio frequency echo signal to obtain an amplified echo signal; and carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
To facilitate a thorough understanding of the various embodiments of the present application by those skilled in the art, reference will now be made to specific examples.
Fig. 7 is a system block diagram of a leaky cable fault detection method according to an embodiment of the present invention, and as shown in fig. 1, a weak fault signal detection system according to an embodiment of the present invention may include an FPGA module 701, a first frequency mixing module 702, a first amplifying module 703, a T/R module 704, a second amplifying module 705, and a second frequency mixing module 706. The output end of the FPGA module 701 is connected with the input end of the first frequency mixing module 702, the output end of the first frequency mixing module 702 is connected with the input end of the first amplifying module 703, the output end of the first amplifying module 703 is connected with the input end of the T/R module 704, the output end of the T/R module 704 is connected with the input end of the delay processing module 705, the output end of the delay processing module 705 is connected with the input end of the second amplifying module 706, the output end of the second amplifying module 706 is connected with the input end of the second frequency mixing module 707, and the output end of the second frequency mixing module 707 is connected with the input end of the FPGA module 701.
Among them, the FPGA (Field-Programmable Gate Array), which is a product of further development based on the traditional Programmable device; the circuit is a semi-custom circuit in the field of application-specific integrated circuits, not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A weak fault signal detection method is characterized in that the method is applied to a weak fault signal detection system, the weak fault signal detection system is provided with a time delay processing unit, and the method comprises the following steps:
acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay; wherein, an initial fault echo signal is received; performing group delay processing on the initial fault echo signal through the delay processing unit to obtain the fault echo signal so as to separate a transmission leakage interference signal from a reflection echo signal of the fault point on a time scale;
carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
2. The method of claim 1, wherein filtering the interference signal from the smoothed echo signal to obtain a clean echo signal comprises:
acquiring a system reference signal; the system reference signal is a composite electromagnetic wave formed by superposing a transmission leakage signal caused by insufficient system isolation, a reflection signal introduced by the deterioration of a standing wave of a system internal connecting line interface or a device port, the system noise and the radio frequency interference inside the system;
carrying out waveform averaging on the system reference signal to obtain a smooth reference signal;
and subtracting the smooth reference signal from the smooth echo signal to obtain the pure echo signal.
3. The method of claim 2, wherein the obtaining a system reference signal comprises:
and connecting the system for detecting the weak fault signal with a matched load to obtain a system reference signal.
4. The method of claim 1, wherein the obtaining a fault echo signal of a fault point comprises:
generating an excitation detection signal and converting the excitation detection signal into an emission detection signal;
transmitting the emission detection signal;
receiving a reflected echo signal fed back by the fault point aiming at the emission detection signal as the initial fault echo signal;
and performing group delay processing on the initial fault echo signal through the delay processing unit to obtain the fault echo signal.
5. The method of claim 4, wherein converting the excitation detection signal to an emission detection signal comprises:
performing digital-to-analog conversion on the excitation detection signal to obtain an analog detection signal;
carrying out analog up-conversion processing on the analog detection signal to obtain an analog intermediate frequency detection signal;
carrying out frequency mixing processing on the analog intermediate frequency detection signal to obtain a radio frequency detection signal;
amplifying the radio frequency detection signal to obtain a power amplifier radio frequency detection signal;
and carrying out time delay processing on the power amplifier radio frequency detection signal to obtain the emission detection signal.
6. The method according to claim 4, wherein said performing, by the delay processing unit, group delay processing on the initial fault echo signal to obtain the fault echo signal comprises:
performing time delay processing conversion on the initial fault echo signal to obtain a preprocessed radio frequency echo signal;
converting the preprocessed radio frequency echo signal into an intermediate frequency echo signal;
performing analog-to-digital conversion on the intermediate frequency echo signal to obtain a first digital echo signal;
carrying out sampling rate change on the first digital echo signal to obtain a second digital echo signal;
and carrying out low-pass filtering on the second digital echo signal to obtain the fault echo signal of the fault point.
7. The method of claim 6, wherein said converting the preprocessed radio frequency echo signals to intermediate frequency echo signals comprises:
performing signal amplification on the preprocessed radio frequency echo signal to obtain an amplified echo signal;
and carrying out frequency mixing processing on the amplified echo signal and a system local oscillator to obtain an intermediate frequency echo signal.
8. A weak fault signal detection device is characterized in that the device is applied to a weak fault signal detection system, the weak fault signal detection system is provided with a time delay processing unit, and the device comprises:
the acquisition module is used for acquiring a fault echo signal of a fault point; the fault echo signal is obtained by processing an initial fault echo signal through group delay; wherein, an initial fault echo signal is received; performing group delay processing on the initial fault echo signal through the delay processing unit to obtain the fault echo signal so as to separate a transmission leakage interference signal from a reflection echo signal of the fault point on a time scale;
the waveform averaging module is used for carrying out waveform averaging on the fault echo signal to obtain a smooth echo signal;
the filtering module is used for filtering interference signals in the smooth echo signals to obtain pure echo signals; the pure echo signal is used for determining fault information of a fault point.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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