Communication cable test method and equipment

Abstract

The invention is suitable for the technical field of communication cable detection, and particularly relates to a communication cable testing method and equipment, and the communication cable testing method comprises the steps: transmitting a high-frequency excitation signal on a communication cable, and detecting a first wave signal on the communication cable; obtaining line condition information according to the first wave signal; when the line condition information indicates that the operation performance of the communication cable does not reach the standard, sending a measurement signal on the communication cable, detecting a second wave signal on the communication cable, and obtaining a first time difference according to the measurement signal and the second wave signal; and obtaining fault position information of the communication cable according to the first time difference. The communication cable testing method and device can solve the problems that an existing communication cable testing method is not sensitive to judgment of a long communication cable, and the damage position of the long communication cable cannot be known.

Description

Technical Field

[0001] The present application belongs to the technical field of communication cable detection, and in particular, to a communication cable testing method and equipment. Background Art

[0002] Communication cables mainly refer to communication cables, which are cables used to transmit telephone, telegram, fax documents, television and radio programs, data and other electrical signals, including coaxial cables, twisted pair cables and single conductors. Compared with overhead wires, communication cables have the advantages of large communication capacity, high transmission stability, good confidentiality, and less influence by natural conditions and external interference.

[0003] The existing communication cable testing method determines whether the communication cable is damaged by measuring the resistance of the communication cable, but it is not sensitive to long communication cables and cannot know the damaged position of the long communication cable. Summary of the invention

[0004] The embodiments of the present application provide a communication cable testing method and device, which can solve the problem that the existing communication cable testing method is insensitive to long communication cables and cannot know the damage location of the long communication cables.

[0005] In a first aspect, an embodiment of the present application provides a communication cable testing method, the communication cable testing method being applied to a communication cable testing device, the method comprising:

[0006] A high-frequency excitation signal is sent on the communication cable to detect a first wave signal on the communication cable; wherein the high-frequency excitation signal is a high-frequency periodic continuous signal, the high frequency refers to a frequency greater than 300 MHz, the first wave signal refers to a superimposed signal of the high-frequency excitation signal and an echo signal, and the echo signal refers to an electric wave reflection signal caused by a characteristic impedance mismatch of the communication cable;

[0007] Obtaining line condition information according to the first wave signal; wherein the line condition information is used to reflect the operation status of the communication cable;

[0008] When the line condition information indicates that the operating performance of the communication cable is not up to standard, a measurement signal is sent on the communication cable, and a second wave signal on the communication cable is detected, and a first time difference is obtained according to the measurement signal and the second wave signal; wherein the measurement signal is used to measure the fault condition of the communication cable, the second wave signal refers to the radio wave signal detected on the communication cable after the measurement signal is sent, and the first time difference refers to the time difference between sending the measurement signal and receiving the echo signal in the second wave signal corresponding to the measurement;

[0009] The fault location information of the communication cable is obtained according to the first time difference; wherein the fault location information is used to reflect the location of the fault that causes the operating performance of the communication cable to be substandard.

[0010] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0011] The communication cable testing method provided by the present application, first, sends a high-frequency excitation signal on the communication cable, detects the first wave signal on the communication cable, this step detects the damage of the communication cable through the impedance characteristics in the high-frequency circuit, and the characteristic impedance of the cable in the high-frequency circuit is independent of the cable length, which is conducive to solving the problem of insensitivity to fault judgment of long communication cables. Secondly, the line condition information is obtained according to the first wave signal. This step judges the operating performance of the communication cable by analyzing the first wave signal, which can effectively reflect whether the communication cable is faulty and the degree of fault, and can solve the problem of insensitivity to fault judgment of long communication cables. Subsequently, when the line condition information indicates that the operating performance of the communication cable is not up to standard, a measurement signal is sent on the communication cable, and a second wave signal on the communication cable is detected. A first time difference is obtained according to the measurement signal and the second wave signal. This step sends a measurement signal on the communication cable and detects the second wave signal to obtain the first time difference between the sending and receiving of the two signals. The distance of the reflected wave of the measurement signal can be obtained through the first time difference, which is conducive to solving the problem that the damage position of the long communication cable cannot be known. Finally, the fault location information of the communication cable is obtained according to the first time difference. This step obtains the distance of the reflected wave of the measurement signal through the first time difference, and then obtains the fault location information of the communication cable, which can solve the problem of not being able to know the damaged location of the long communication cable.

[0012] In a second aspect, an embodiment of the present application provides a communication cable testing device, comprising:

[0013] A signal generating and collecting unit, used for sending a high-frequency excitation signal on the communication cable, and detecting a first wave signal on the communication cable; wherein the high-frequency excitation signal is a high-frequency periodic continuous signal, and the high frequency refers to a frequency greater than 300 MHz, and the first wave signal refers to a superimposed signal of the high-frequency excitation signal and an echo signal, and the echo signal refers to an electric wave reflection signal caused by the mismatch of the characteristic impedance of the communication cable;

[0014] An analysis unit, configured to obtain line condition information according to the first wave signal; wherein the line condition information is used to reflect the operation status of the communication cable;

[0015] The signal generating and collecting unit is further used to send a measurement signal on the communication cable and detect a second wave signal on the communication cable when the line condition information indicates that the operating performance of the communication cable does not meet the standard, and obtain a first time difference according to the measurement signal and the second wave signal; wherein the measurement signal is used to measure the fault condition of the communication cable, the second wave signal refers to the radio wave signal detected on the communication cable after the measurement signal is sent, and the first time difference refers to the time difference between sending the measurement signal and receiving the echo signal in the second wave signal corresponding to the measurement signal;

[0016] The analysis unit is further used to obtain the fault location information of the communication cable according to the first time difference; wherein the fault location information is used to reflect the location of the fault that causes the operating performance of the communication cable to be substandard.

[0017] In a third aspect, an embodiment of the present application provides a communication cable testing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the methods described in the first aspect when executing the computer program.

[0018] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the first aspects above is implemented.

[0019] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on a communication cable testing device, the communication cable testing device executes the communication cable testing method described in any one of the above-mentioned first aspects.

[0020] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a flow chart of a communication cable testing method provided in one embodiment of the present application;

[0023] Figure 2It is a waveform diagram of one frame of a waveform of a cut waveform of an example of obtaining the instantaneous standing wave ratio in step S321 of the communication cable testing method provided in one embodiment of the present application;

[0024] Figure 3 It is a waveform diagram of another frame waveform of a cut waveform of an example of obtaining the instantaneous standing wave ratio in step S321 of the communication cable testing method provided in one embodiment of the present application;

[0025] Figure 4 It is a structural schematic diagram of a communication cable testing device provided in one embodiment of the present application;

[0026] Figure 5 It is a structural schematic diagram of a communication cable testing device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0028] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0031] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0032] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0033] In the related art, the quality of a communication cable is determined by measuring its electrical performance parameters such as resistance and capacitance. However, for a long communication cable, resistance and capacitance will increase with the length of the communication cable. At this time, the resistance and capacitance changes caused by the damaged part of the communication cable will inevitably be diluted by the large resistance and capacitance of the long communication cable itself, resulting in insensitivity to the judgment of the long communication cable. Moreover, resistance and capacitance are both scalars, and the damaged location of the long communication cable cannot be known.

[0034] To solve the above problems, the embodiment of the present application provides a communication cable testing method. In the method, first, a high-frequency excitation signal is sent on the communication cable to detect the first wave signal on the communication cable. This step detects the damage of the communication cable through the impedance characteristics in the high-frequency circuit. The characteristic impedance of the cable in the high-frequency circuit is independent of the cable length, which is conducive to solving the problem of insensitivity to fault judgment of long communication cables. Secondly, the line condition information is obtained according to the first wave signal. This step judges the operating performance of the communication cable by analyzing the first wave signal, which can effectively reflect whether the communication cable is faulty and the degree of fault, and can solve the problem of insensitivity to fault judgment of long communication cables. Subsequently, when the line condition information indicates that the operating performance of the communication cable is not up to standard, a measurement signal is sent on the communication cable, and a second wave signal on the communication cable is detected. A first time difference is obtained according to the measurement signal and the second wave signal. This step sends a measurement signal on the communication cable and detects the second wave signal to obtain the first time difference between the sending and receiving of the two signals. The distance of the reflected wave of the measurement signal can be obtained through the first time difference, which is conducive to solving the problem that the damage position of the long communication cable cannot be known. Finally, the fault location information of the communication cable is obtained according to the first time difference. This step obtains the distance of the reflected wave of the measurement signal through the first time difference, and then obtains the fault location information of the communication cable, which can solve the problem of not being able to know the damaged location of the long communication cable.

[0035] The communication cable testing method provided in the embodiment of the present application can be applied to a communication cable testing device. In this case, the communication cable testing device is the executor of the communication cable testing method provided in the embodiment of the present application. The embodiment of the present application does not impose any restrictions on the specific type of the communication cable testing device.

[0036] For example, the communication cable testing equipment may include a signal generating device, a signal receiving device, and a control device that is communicatively connected to the signal generating device and the signal receiving device. The signal generating device may be a signal generator, and the signal receiving device may be a network analyzer. The control device may control the signal generating device to generate a specific radio wave signal, and the control device may also control the signal receiving device to detect the radio wave signal on the communication cable. The control device may also analyze the line condition information of the communication cable according to the radio wave signal detected by the signal receiving device. The control device may also time the time difference between the two signals, and the control device may also analyze the time difference between the two signals to obtain the fault location information of the communication cable.

[0037] The control device may be a single chip microcomputer, a mobile phone, a tablet computer, a vehicle-mounted device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a desktop computer, a computer, a laptop computer, a handheld communication device, or a handheld computing device.

[0038] In order to better understand the communication cable testing method provided in the embodiment of the present application, the specific implementation process of the communication cable testing method provided in the embodiment of the present application is exemplarily introduced below.

[0039] Figure 1 A schematic flow chart of a communication cable testing method provided in an embodiment of the present application is shown, and the communication cable testing method includes:

[0040] S100, sending a high-frequency excitation signal on the communication cable to detect the first wave signal on the communication cable. The high-frequency excitation signal is a high-frequency periodic continuous signal, and the high frequency refers to a frequency greater than 300MHz. The first wave signal refers to a superimposed signal of the high-frequency excitation signal and the echo signal, and the echo signal refers to an electric wave reflection signal caused by the mismatch of the characteristic impedance of the communication cable.

[0041] It can be understood that a high-frequency excitation signal is generated on the communication cable through a signal generating device, and after a short period of time, the high-frequency excitation signal and the echo signal are superimposed, and then the first wave signal on the communication cable is detected by a signal receiving device. The short period of time can be 100ms, but is not limited to this.

[0042] With such a setting, in the high-frequency field, the fluctuation characteristics and phase characteristics of the electrical signal cannot be ignored, and the capacitive reactance and inductive reactance characteristics of the communication cable cannot be ignored. This will cause the electrical signal to have the reflection and refraction properties of visible light. Just as visible light will be reflected due to the change in the refractive index of the medium, high-frequency electrical signals will also be reflected due to the sudden change in the impedance of a small section of the communication cable. The impedance of a small section of the communication cable is the characteristic impedance of the small section of the communication cable. When the communication cable is damaged, the impedance of a section of the communication cable changes, which in turn causes the characteristic impedance of the entire communication cable to mismatch, which will cause the generation of an echo signal and superposition of the excitation signal. This step completes the requirements for testing the communication cable by analyzing the superimposed signal.

[0043] In a possible implementation, in step S100, detecting a first wave signal on a communication cable includes:

[0044] S110, setting a plurality of voltage sampling points on the communication cable, wherein the number of the voltage sampling points is greater than three, the voltage sampling points are equidistantly set, the distance between adjacent voltage sampling points is less than half the wavelength of the high-frequency excitation signal, and the distance between the two farthest voltage sampling points is greater than the wavelength of the high-frequency excitation signal.

[0045] It can be understood that the first wave signal is a superposition signal of the high-frequency excitation signal and the echo signal, and has both time and space complexity. Therefore, the space complexity is satisfied by setting a plurality of voltage sampling points, and the voltage sampling points are set equidistantly. According to the Nyquist sampling theorem, the sampling frequency must be greater than twice the frequency of the first wave signal, that is, the distance between adjacent voltage sampling points is less than half the wavelength of the high-frequency excitation signal; when sampling a sine waveform, at least three sampling points are required to represent all the information of the sine wave, so the number of voltage sampling points needs to be greater than three; and the sampling range needs to include at least one periodic waveform of the first wave signal, that is, the distance between the two farthest voltage sampling points is greater than the wavelength of the high-frequency excitation signal, so that the frequency of the high-frequency excitation signal can be large enough to make the distance span of the voltage sampling points small enough.

[0046] With this arrangement, the superimposed signal after the echo signal and the excitation signal are superimposed is an electric wave signal with the same frequency as the excitation signal and a standing wave ratio greater than 1. Because the echo signal and the excitation signal are in opposite directions, the superimposed signal is also a signal with dual complexity in time and space. The waveform of the first wave signal cannot be directly obtained through an oscilloscope (the oscilloscope measures the waveform of an electrical signal at a fixed position and does not have spatial complexity). Therefore, it is necessary to use an instrument with dual complexity in time and space to measure the waveform of the superimposed signal.

[0047] S120, a plurality of voltage sampling points simultaneously perform voltage sampling at a first frequency to obtain a first wave signal, wherein the first frequency is a frequency greater than twice the frequency of the high-frequency excitation signal.

[0048] It can be understood that this step is used to solve the time complexity. According to the Nyquist sampling theorem, the sampling frequency (first frequency) must be greater than twice the frequency of the high-frequency excitation signal. Then, the m voltage sampling points are simultaneously sampled at the first frequency. After sampling n times, the time-domain discrete sampling point sets a1[n], a2[n], a3[n]...am[n] of the m voltage sampling points can be obtained. Each sampling point set a1[n], a2[n], a3[n]...am[n] is substituted into the interpolation function to restore the continuous-time signal. where (a(nTs) is the parameter substituted by the sampling point set a1[n], a2[n], a3[n]..., ws is 1 / 2 times the sampling frequency, and is the Ts sampling period), the f(t) waveform of the m voltage sampling points with respect to time is obtained, and the waveform function H(t,x) of the first wave signal is solved by combining the simultaneous equations of the m f(t) and the positions x of the m voltage sampling points.

[0049] With this setting, the first wave of signals can be obtained completely.

[0050] S200, obtaining line condition information according to the first wave signal, wherein the line condition information is used to reflect the operation status of the communication cable.

[0051] It can be understood that the first wave signal includes an incident wave and a reflected wave. The greater the power of the reflected wave, the higher the degree of characteristic impedance mismatch of the cable. The waveform function H(t,x) of the first wave signal can be analyzed to obtain the standing wave ratio of the first wave signal. The operating condition of the communication cable can be determined based on the size of the standing wave ratio of the first wave signal.

[0052] Such a setting can effectively reflect the operation status of the communication cable.

[0053] In a possible implementation, in step S200, obtaining line condition information according to the first wave signal includes:

[0054] S210, obtaining a return loss according to the first wave signal, wherein the return loss refers to the ratio of the power of the high-frequency excitation signal to the power of the return signal in the first wave signal.

[0055] It can be understood that the standing wave ratio of the first wave signal can be obtained according to the waveform function H(t,x) of the first wave signal. The standing wave ratio = Umax / Umin, where Umax is the maximum peak voltage amplitude of the first wave signal (without a positive or negative sign, the maximum is positive infinity), and Umin is the minimum peak voltage amplitude of the first wave signal (without a positive or negative sign, the minimum is 0). VSWP refers to the standing wave ratio. The first wave signal can also be input into the network analyzer to directly obtain the instantaneous return loss at every moment.

[0056] With such an arrangement, the ratio of the power of the high-frequency excitation signal to the power of the echo signal can be obtained.

[0057] S220: When the return loss is less than or equal to the first threshold, the line condition information is obtained that the operating performance of the communication cable does not meet the standard.

[0058] It can be understood that the greater the return loss, the smaller the power of the reflected wave. Therefore, when the return loss is set to be less than or equal to the first threshold, it means that there is a problem with the operation of the communication cable. The first threshold can be 10dB, etc., but is not limited to this.

[0059] Such a setting can effectively reflect the operating performance of the communication cable.

[0060] S300, when the line condition information indicates that the operating performance of the communication cable is not up to standard, a measurement signal is sent on the communication cable, and a second wave signal on the communication cable is detected, and a first time difference is obtained according to the measurement signal and the second wave signal. The measurement signal is used to measure the fault condition of the communication cable, the second wave signal refers to the radio wave signal detected on the communication cable after the measurement signal is sent, and the first time difference refers to the time difference between sending the measurement signal and receiving the echo signal in the second wave signal corresponding to the measurement signal.

[0061] It can be understood that when the line condition information indicates that the operating performance of the communication cable is not up to standard, a specific measurement signal is sent through the signal generating device, and the second wave signal on the communication cable is detected by the signal receiving device (the detection method is the same as the first wave signal), and the first time difference between the echo signal of the sent measurement signal and the received measurement signal is obtained. The measurement signal needs to have a high-frequency component, which can be a high-frequency sine wave or an impulse signal (the impulse signal has a component from -∞ to ∞ in the frequency domain).

[0062] By setting in this way, the travel time of the reflected signal at the fault point of the communication cable can be obtained.

[0063] In a possible implementation, in step S300, obtaining a first time difference according to the measurement signal and the second wave signal includes:

[0064] S311, setting the measurement signal as an impulse signal, timing after sending the measurement signal, and pausing timing and obtaining a first time difference when the voltage amplitude in the second wave signal is greater than the first voltage, wherein the first voltage is the voltage of the impulse signal multiplied by a preset constant.

[0065] It can be understood that the measurement signal is set as an impulse signal, and the timing starts immediately after the measurement signal is sent, and the voltage amplitude of the second wave signal is monitored at all times. When the echo signal of the impulse signal arrives, there will be a voltage mutation. The monitoring threshold is set as the first voltage, and the first voltage = the voltage of the impulse signal × a preset constant (the voltage of an ideal impulse signal is ∞, but in reality, an impulse signal generally refers to a quasi-impulse signal with a relatively large voltage). The preset constant can be 0.1, etc., but is not limited to this. When a voltage value exceeding the first voltage is detected during the monitoring process, the timing is paused and the first time difference is obtained.

[0066] With such a setting, the first time difference can be obtained quickly.

[0067] Optionally, obtaining the first time difference according to the measurement signal and the second wave signal further includes:

[0068] S321, set the measurement signal as a high-frequency periodic signal, and after sending the measurement signal, perform an intercepting operation on the second wave signal at intervals of the first duration to obtain the first critical waveform ranking. Among them, the intercepting operation refers to intercepting the waveform of the target signal at a fixed position at intervals corresponding to the target duration. Among all the intercepted waveforms of the target signal, the critical waveform is found. The target duration is the predetermined duration for performing the intercepting operation, the target signal is the signal on which the intercepting operation is performed, the critical waveform is the intercepted waveform in all the intercepted waveforms of the target signal whose change amount of the first standing wave ratio is greater than the preset critical value, and the first critical waveform ranking is the ranking of the critical waveform among all the intercepted waveforms of the target signal.

[0069] It can be understood that the measurement signal is set as a high-frequency periodic signal, such as a high-frequency sine wave or a high-frequency square wave, etc. After sending the measurement signal, the second wave signal is intercepted for the first time. The interception is a short-time detection. Intercepting the second wave signal is to perform a short-time detection greater than T at the same time through all the voltage sampling heads on the communication cable. T is a period of the measurement signal. Intercepting the second wave signal can obtain the waveform of the second wave signal with double complexity of time and space that lasts for a T time, and thus the instantaneous standing wave ratio can be obtained. Then, the second wave signal is intercepted again every interval of the first duration to obtain an array b[x] of the instantaneous standing wave ratios of the second wave signal (0 < x ≤ n), where n is the number of times of performing the intercepting operation. Among all the intercepted waveforms b[x], the intercepted waveform b[i] whose change amount of the instantaneous standing wave ratio is greater than the preset critical value (i.e., b[x] - b[x - 1] > the preset critical value) is found. i is the first critical waveform ranking. The preset critical value can be 2, or other values greater than 1, etc., but is not limited to this.

[0070] Exemplarily, such as Figure 2As shown, the yellow line is the incident signal g(x) = sin(x×π + t×π), the blue line is the reflected signal p(x) = 0.5×sin(x×π - t×π)×(x > t), and the red line is the superimposed signal f(x) = g(x) + p(x). Figure 2 It is the starting state of a clipped waveform (t = 2, 0 ≤ t ≤ 2) (a clipped waveform can be regarded as a short dynamic graph). At this time, the superimposed signal (red line) has the maximum peak voltage amplitude at x = 2.5, and the peak value Umax is 1.5. Figure 3 It is the intermediate state of a clipped waveform (t = 1.5, 0 ≤ t ≤ 2). At this time, the superimposed signal (red line) has the minimum peak voltage amplitude at x = 2, and the peak value Umin is 0.5. Then, according to Umax and Umin, the instantaneous standing wave ratio VSWP = Umax / Umin = 3.

[0071] With such a setting, it is not necessary to detect the waveform of the second wave signal greater than 300 MHz all the time. Only by intercepting the second wave signal at intervals of the first duration and obtaining the ranking of the first critical waveform, the value range of the first time difference can be determined.

[0072] S322. Multiply the ranking of the first critical waveform by the first duration to obtain the first time difference.

[0073] It can be understood that the first critical waveform can reflect in which time period the first time difference is located, and the first duration is the length of a time period. Multiplying the ranking of the first critical waveform by the first duration to obtain the value range of the first time difference can reduce the first duration to narrow the size of a value range, so as to improve the accuracy of the obtained first time difference. The first time difference can be the middle value of the value range ((the first time difference = (the ranking of the first critical waveform - 0.5)×the first duration)), or it can be other values between the value ranges (the first time difference = (the ranking of the first critical waveform - x)×the first duration, 0 < x < 1), etc., but not limited to this.

[0074] With such a setting, the first time difference can be obtained quickly.

[0075] Optionally, obtaining the first time difference according to the measurement signal and the second wave signal further includes:

[0076] S331. Set the measurement signal as a periodic signal of the second frequency, and after sending the measurement signal, perform an intercept operation on the second wave signal at intervals of the second duration to obtain the ranking of the second critical waveform. Here, the second frequency is a high frequency, and the ranking of the second critical waveform refers to the ranking of the critical waveform obtained by performing an intercept operation on the second wave signal at intervals of the second duration.

[0077] It can be understood that the measurement signal is set as a high-frequency periodic signal, such as a high-frequency sine wave or a high-frequency square wave, etc. After sending the measurement signal, the second wave signal is intercepted for the first time to obtain the waveform of the instantaneous second wave signal with double complexity of time and space and the instantaneous standing wave ratio. Then, the second wave signal is intercepted again every second time interval to obtain the instantaneous standing wave ratio array c[n] of the second wave signal, where n is the number of interception operations. Among all the intercepted waveforms c[n], the first intercepted waveform c[j] whose standing wave ratio change amount is greater than the preset critical value (i.e., c[k] - c[k - 1] > preset critical value, (0 < k ≤ n)) is found, and j is the ranking of the second critical waveform.

[0078] With such a setting, the value range of the first time difference can be quickly determined.

[0079] S332. When the ranking of the second critical waveform is greater than the second threshold, the transmission of the measurement signal is paused to make the second wave signal zero, and then the measurement signal is sent again. After waiting for N second time intervals, the second wave signal is intercepted at intervals of the third time interval to obtain the ranking of the third critical waveform. According to the product of the ranking of the third critical waveform and the third time interval, and the product of the ranking of the second critical waveform and the second time interval, the first time difference is obtained. Here, N is equal to the value of the ranking of the second critical waveform minus one, the third time interval is less than the second time interval, and the ranking of the third critical waveform refers to the ranking of the critical waveform obtained by intercepting the second wave signal at intervals of the third time interval.

[0080] It can be understood that the second threshold is set to distinguish the magnitude of the first time difference. When the ranking of the second critical waveform is greater than the second threshold, it means that the first time difference is long enough that the impulse signal generated by the signal generating device will disperse on both sides of the time axis (the specific value of the second threshold is affected by the quality of the communication cable and can be adjusted as appropriate). At this time, the impulse signal is not suitable for the measurement signal, so the measurement signal remains unchanged as a high-frequency periodic signal. After re-sending the measurement signal, first wait for the time of (ranking of the second critical waveform - 1) × second time interval, and then intercept the second wave signal at intervals of the third time interval to obtain the ranking of the third critical waveform. This step is equivalent to first determining which large range the target is in, and then performing range subdivision within this large range to quickly determine the position of the target. In this step, the large range where the first time difference is located (i.e., ranking of the second critical waveform - 1) has been determined. Subsequently, within the large range, small-range subdivision screening is performed at intervals of the third time interval (the third time interval is less than the second time interval) to obtain the small range where the first time difference is located (i.e., ranking of the third critical waveform). Then, the first time difference = (ranking of the second critical waveform - 1) × second time interval + (ranking of the third critical waveform - x) × third time interval, (0 < x < 1).

[0081] With such an arrangement, when the communication cable fault is far enough away, high accuracy can still be ensured and the first time difference can be obtained quickly.

[0082] S333, when the second critical waveform ranking is less than or equal to the second threshold, suspend sending the measurement signal to return the second wave signal to zero, then set the measurement signal to an impulse signal and send it, and perform timing after sending the measurement signal. When the voltage amplitude in the second wave signal is greater than the first voltage, suspend timing and obtain the first time difference.

[0083] It can be understood that when the second critical waveform ranking is less than or equal to the second threshold, it means that the first time difference is not enough to make the impulse signal generated by the signal generating device dissipate on both sides of the time axis. Therefore, the measurement signal is set to an impulse signal, and timing is performed after the measurement signal is sent. When the voltage amplitude in the second wave signal is greater than the first voltage, the timing is paused and the first time difference is obtained. The first voltage = the voltage of the impulse signal × the preset constant. The preset constant can be 0.1 or other values ​​less than 1.

[0084] With such an arrangement, the first time difference can be obtained most quickly when the distance to the fault location of the communication cable is close.

[0085] S400: Obtain fault location information of the communication cable according to the first time difference, wherein the fault location information is used to reflect the location of the fault that causes the operation performance of the communication cable to be substandard.

[0086] It can be understood that after obtaining the first time difference, the first time difference × the propagation speed of electromagnetic waves in the communication cable = the distance the reflected wave propagates in the communication cable. The propagation speed of electromagnetic waves in the communication cable is generally between 0.8c and 0.9c (c is the speed of light). After obtaining the distance the reflected wave propagates in the communication cable, the routing diagram of the communication cable can be obtained from the information record when the communication cable is wired, and then the fault location information of the communication cable can be obtained. The fault location information can be longitude and latitude information.

[0087] With such an arrangement, the fault location information of the communication cable can be obtained quickly and at a long distance.

[0088] In a possible implementation, in step S400, obtaining fault location information of the communication cable according to the first time difference includes:

[0089] S410, obtaining a reflected wave displacement according to the first time difference, wherein the reflected wave displacement refers to the displacement of the reflected wave of the measurement signal.

[0090] It can be understood that the first time difference × the propagation speed of the electromagnetic wave in the communication cable = the reflected wave displacement can be manually set by the propagation speed of the electromagnetic wave in the communication cable, or the type or model of the communication cable can be manually selected, and then the corresponding propagation speed of the electromagnetic wave in the communication cable is determined according to the type or model of the communication cable. The model of the communication cable can also be obtained from the information record when the communication cable is laid, so as to obtain the propagation speed of the electromagnetic wave in the communication cable.

[0091] S420: Obtain a wiring diagram of the communication cables.

[0092] It is understandable that a QR code may be provided on the communication cable, and after scanning the QR code, a routing diagram of the communication cable may be obtained from a government or other relevant website.

[0093] With this setting, you can quickly obtain the routing diagram of the communication cables.

[0094] S430, obtaining fault location information of the communication cable according to the wiring diagram and the reflected wave displacement.

[0095] It can be understood that after obtaining the reflected wave displacement, the reflected wave displacement / 2 is obtained to obtain the fault path length of the communication cable, and then the fault path length is moved along the routing diagram to obtain the fault location information of the communication cable.

[0096] With such an arrangement, the fault location information of the communication cable can be quickly obtained.

[0097] Optionally, the communication cable contains more than one fault, and the communication cable testing method further includes:

[0098] S510, after obtaining the first time difference according to the measurement signal and the second wave signal, record the first first time difference into the first array and clear the first time difference, continue to obtain the second first time difference according to the measurement signal and the second wave signal to cyclically fill the first array.

[0099] It can be understood that when the communication cable contains more than one fault, the communication cable has multiple first time differences that correspond to each other. After the step of obtaining the first time difference according to the measurement signal and the second wave signal, the first time difference is recorded in the first array and the first time difference is cleared, and then the first time difference is obtained according to the measurement signal and the second wave signal. For example, the measurement signal is an impulse signal. After detecting that the second wave signal is greater than the first voltage for the first time, continue to detect whether the second wave signal is greater than the first voltage, and record all the time points when the second wave signal is greater than the first voltage to cyclically fill the first array; for example, the measurement signal is a high-frequency periodic signal. After detecting that the first standing wave ratio change is greater than the preset critical value, continue to detect whether the standing wave ratio change is greater than the preset critical value, and record all the time points when the standing wave ratio change is greater than the preset critical value to fill the first array.

[0100] Such an arrangement can improve the applicability of the communication cable testing method.

[0101] S520 When obtaining the fault location information of the communication cable according to the first time difference, multiple fault location information are obtained according to multiple first time differences in the first array.

[0102] It can be understood that the first array includes data of multiple first time differences, and the corresponding reflected wave displacements are obtained in sequence according to the multiple first time differences, and then the fault location information of all faults is obtained.

[0103] Such an arrangement can improve the applicability of the communication cable testing method.

[0104] Optionally, the communication cable testing method further includes:

[0105] S610, communication cables include coaxial cables and twisted pair cables.

[0106] It can be understood that the method is applied to communication cables with stable characteristic impedance. Communication cables can be divided into single conductors, twisted pairs, and coaxial cables, among which communication cables with stable characteristic impedance include coaxial cables and twisted pairs.

[0107] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0108] Corresponding to the communication cable testing method described in the above embodiment, the embodiment of the present application further provides a communication cable testing device, and each unit of the device can implement each step of the communication cable testing method. Figure 4 A structural block diagram of a communication cable testing device provided in an embodiment of the present application is shown. For ease of explanation, only the parts related to the embodiment of the present application are shown.

[0109] Reference Figure 4 , the device comprises:

[0110] The signal generation and acquisition unit is used to send a high-frequency excitation signal on the communication cable and detect the first wave signal on the communication cable. The high-frequency excitation signal is a high-frequency periodic continuous signal, and the high frequency refers to a frequency greater than 300MHz. The first wave signal refers to the superposition signal of the high-frequency excitation signal and the echo signal, and the echo signal refers to the radio wave reflection signal caused by the mismatch of the characteristic impedance of the communication cable;

[0111] An analysis unit, used to obtain line condition information according to the first wave signal. The line condition information is used to reflect the operation status of the communication cable;

[0112] The signal generation and acquisition unit is also used to send a measurement signal on the communication cable and detect the second wave signal on the communication cable when the line condition information indicates that the operating performance of the communication cable does not meet the standard, and obtain a first time difference based on the measurement signal and the second wave signal. The measurement signal is used to measure the fault condition of the communication cable, the second wave signal refers to the radio wave signal detected on the communication cable after the measurement signal is sent, and the first time difference refers to the time difference between the echo signal in the second wave signal corresponding to the sending measurement signal and the receiving measurement signal;

[0113] The analysis unit is further used to obtain the fault location information of the communication cable according to the first time difference, wherein the fault location information is used to reflect the location of the fault that causes the operation performance of the communication cable to be substandard.

[0114] It should be noted that the information interaction, execution process and other contents between the above-mentioned units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0115] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units is used as an example for illustration. In practical applications, the above-mentioned functions can be assigned to different functional units as needed, that is, the internal structure of the device can be divided into different functional units to complete all or part of the functions described above. The functional units in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0116] The present application also provides a communication cable testing device, Figure 5 This is a schematic diagram of the structure of a communication cable testing device provided in one embodiment of the present application. Figure 5 As shown, the control device 5 of the communication cable test equipment of this embodiment includes: at least one processor 50 ( Figure 5 Only one is shown), at least one memory 51 ( Figure 5Only one is shown in the figure) and a computer program 52 stored in the at least one memory 51 and executable on the at least one processor 50. When the processor 50 executes the computer program 52, the control device 5 of the communication cable testing equipment implements the steps in any of the above-mentioned communication cable testing method embodiments, or the control device 5 of the communication cable testing equipment implements the functions of each unit in the above-mentioned device embodiments.

[0117] Exemplarily, the computer program 52 may be divided into one or more units, which are stored in the memory 51 and executed by the processor 50 to complete the present application. The one or more units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 52 in the control device 5 of the communication cable test equipment.

[0118] The control device 5 of the communication cable test equipment can be a single chip microcomputer, a microprocessor, a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a desktop computer, a smart screen, a smart TV, or a handheld device with wireless communication function. The control device 5 of the communication cable test equipment can include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art can understand that Figure 5 It is only an example of the control device 5 of the communication cable testing equipment and does not constitute a limitation on the control device 5 of the communication cable testing equipment. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components, for example, it may also include input and output devices, network access devices, buses, etc.

[0119] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0120] In some embodiments, the memory 51 may be an internal storage unit of the control device 5 of the communication cable test device, such as a hard disk or memory of the control device 5 of the communication cable test device. In other embodiments, the memory 51 may also be an external storage device of the control device 5 of the communication cable test device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the control device 5 of the communication cable test device. Further, the memory 51 may also include both an internal storage unit and an external storage device of the control device 5 of the communication cable test device. The memory 51 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 51 may also be used to temporarily store data that has been output or is to be output.

[0121] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0122] An embodiment of the present application provides a computer program product. When the computer program product is run on a communication cable testing device, the communication cable testing device is enabled to implement the steps in any of the above-mentioned method embodiments.

[0123] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the communication cable test equipment, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk.

[0124] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0125] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0126] In the embodiments provided in the present application, it should be understood that the disclosed communication cable testing method, communication cable testing device and communication cable testing equipment can be implemented in other ways. For example, the communication cable testing device and communication cable testing equipment embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0127] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A communication cable testing method, characterized in that: The communication cable testing method is applied to a communication cable testing device, and the method comprises: A high-frequency excitation signal is sent on the communication cable to detect a first wave signal on the communication cable; wherein the high-frequency excitation signal is a high-frequency periodic continuous signal, the high frequency refers to a frequency greater than 300 MHz, the first wave signal refers to a superimposed signal of the high-frequency excitation signal and an echo signal, and the echo signal refers to an electric wave reflection signal caused by a characteristic impedance mismatch of the communication cable; Obtaining line condition information according to the first wave signal; wherein the line condition information is used to reflect the operation status of the communication cable; When the line condition information indicates that the operating performance of the communication cable is not up to standard, a measurement signal is sent on the communication cable, and a second wave signal on the communication cable is detected, and a first time difference is obtained according to the measurement signal and the second wave signal; wherein the measurement signal is used to measure the fault condition of the communication cable, the second wave signal refers to the radio wave signal detected on the communication cable after the measurement signal is sent, and the first time difference refers to the time difference between sending the measurement signal and receiving the echo signal in the second wave signal corresponding to the measurement signal; The fault location information of the communication cable is obtained according to the first time difference; wherein the fault location information is used to reflect the location of the fault that causes the operating performance of the communication cable to be substandard.

2. The communication cable testing method according to claim 1, characterized in that: The detecting a first wave signal on the communication cable comprises: A plurality of voltage sampling points are arranged on the communication cable; wherein the number of the voltage sampling points is greater than three, the voltage sampling points are arranged equidistantly, the distance between adjacent voltage sampling points is less than half of the wavelength of the high-frequency excitation signal, and the distance between the two farthest-separated voltage sampling points is greater than the wavelength of the high-frequency excitation signal; The plurality of voltage sampling points simultaneously perform voltage sampling at a first frequency to obtain the first wave signal; wherein the first frequency is a frequency greater than twice the frequency of the high-frequency excitation signal.

3. The communication cable testing method according to claim 1, characterized in that: The obtaining line condition information according to the first wave signal includes: Obtaining a return loss according to the first wave signal; wherein the return loss refers to a ratio of the power of the high-frequency excitation signal in the first wave signal to the power of the return signal; When the echo return loss is less than or equal to the first threshold, the line condition information is obtained as follows: the operating performance of the communication cable does not meet the standard.

4. The communication cable testing method according to claim 1, characterized in that: The obtaining a first time difference according to the measurement signal and the second wave signal comprises: The measurement signal is set as an impulse signal, and timing is performed after sending the measurement signal. When the voltage amplitude in the second wave signal is greater than the first voltage, timing is paused and the first time difference is obtained; wherein the first voltage is the voltage of the impulse signal multiplied by a preset constant.

5. The communication cable testing method according to claim 4, characterized in that: The obtaining of the first time difference according to the measurement signal and the second wave signal further includes: The measurement signal is set to a high-frequency periodic signal, and after sending the measurement signal, the second wave signal is intercepted at intervals of a first time length to obtain a first critical waveform ranking; wherein the interception operation refers to intercepting the waveform of the target signal at a fixed position at intervals corresponding to the target time length, and finding the critical waveform among all intercepted waveforms of the target signal, the target time length refers to a predetermined time length for performing the interception operation, the target signal refers to a signal on which the interception operation is performed, the critical waveform refers to the first intercepted waveform of all intercepted waveforms of the target signal whose standing wave ratio change is greater than a preset critical value, and the first critical waveform ranking refers to the ranking of the critical waveform among all intercepted waveforms of the target signal; The first critical waveform ranking and the first duration are multiplied to obtain the first time difference.

6. The communication cable testing method according to claim 5, characterized in that: The obtaining of the first time difference according to the measurement signal and the second wave signal further includes: The measurement signal is set to a periodic signal of a second frequency, and after sending the measurement signal, the second wave signal is intercepted at intervals of a second time length to obtain a second critical waveform ranking; wherein the second frequency is a high frequency, and the second critical waveform ranking refers to the ranking of critical waveforms obtained after the second wave signal is intercepted at intervals of a second time length; When the second critical waveform ranking is greater than the second threshold, suspend sending the measurement signal to return the second wave signal to zero, then resend the measurement signal, and wait for N second time periods before performing the interception operation on the second wave signal at intervals of a third time period to obtain a third critical waveform ranking, and obtain the first time difference according to the product of the third critical waveform ranking and the third time period, and the product of the second critical waveform ranking and the second time period; wherein N is equal to the value of the second critical waveform ranking minus one, the third time period is less than the second time period, and the third critical waveform ranking refers to the ranking of the critical waveform obtained after performing the interception operation on the second wave signal at intervals of the third time period; When the second critical waveform ranking is less than or equal to the second threshold, the sending of the measurement signal is suspended to make the second wave signal return to zero, and then the measurement signal is set to an impulse signal and sent. After sending the measurement signal, timing is performed. When the voltage amplitude in the second wave signal is greater than the first voltage, timing is suspended and the first time difference is obtained.

7. The communication cable testing method according to claim 1, characterized in that: The obtaining the fault location information of the communication cable according to the first time difference includes: Obtaining a reflected wave displacement according to the first time difference; wherein the reflected wave displacement refers to a displacement of the reflected wave of the measurement signal; Obtaining a wiring diagram of the communication cable; According to the wiring diagram and the reflected wave displacement, the fault location information of the communication cable is obtained.

8. The communication cable testing method according to claim 1, characterized in that: The communication cable has more than one fault, and the method further comprises: After obtaining the first time difference according to the measurement signal and the second wave signal, recording the first first time difference into the first array and clearing the first time difference, and continuing to obtain the second first time difference according to the measurement signal and the second wave signal to cyclically fill the first array; When the fault location information of the communication cable is obtained according to the first time difference, a plurality of the fault location information are obtained according to a plurality of the first time differences in the first array.

9. The communication cable testing method according to claim 1, characterized in that: The communication cables include coaxial cables and twisted pair cables.

10. A communication cable testing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

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