Positioning method of passive intermodulation device and storage medium

Abstract

The invention discloses a passive intermodulation device positioning method and a storage medium. The method comprises the following steps: generating a plurality of size frequency division signals with different frequencies; positioning the passive intermodulation device by using the frequency division signals of various sizes and a preset input signal to obtain measurement distances corresponding to the frequency division signals of various sizes; and extracting an effective value of each measurement distance, and determining the position of the passive intermodulation device based on an effective value merging technology. According to the invention, the positioning accuracy of the passive intermodulation device can be improved.

Description

Technical Field

[0001] This application relates to the technical field of passive intermodulation devices, and particularly to a positioning method and a storage medium for passive intermodulation devices. Background Art

[0002] The existence of passive intermodulation devices may cause the signal quality in the communication link to decline. Therefore, in order to maintain the stability of the communication system, it is usually necessary to locate and monitor the passive intermodulation devices in the communication link so as to maintain and repair the communication system in a timely manner.

[0003] Generally, for the positioning of passive intermodulation devices in the communication link, the related technology is to use the ordinary phase method for ranging. However, the method of using the ordinary phase method for ranging consumes a long calculation time, resulting in the system being unable to respond in a timely manner. In addition, this method cannot accurately locate the passive intermodulation devices in the transmission line, and only the fuzzy position of the passive intermodulation devices can be obtained. Summary of the Invention

[0004] This application provides a positioning method and a storage medium for passive intermodulation devices, which can improve the positioning accuracy of passive intermodulation devices while ensuring the high-efficiency positioning and low complexity of the system; in particular, it also solves the contradiction problem between the ranging range and the positioning accuracy.

[0005] In a first aspect, this application provides a positioning method for passive intermodulation devices, and the method includes:

[0006] Generating a plurality of size division signals with different frequencies;

[0007] Using each size division signal and a preset input signal to locate the passive intermodulation device, and obtaining the measured distance corresponding to each size division signal;

[0008] Extracting the effective value of each measured distance, and determining the position of the passive intermodulation device based on the effective value merging technology.

[0009] In a second aspect, this application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it is used to implement the above-mentioned positioning method for passive intermodulation devices.

[0010] The beneficial effects of this application are as follows: Different from the prior art, this application generates multiple size frequency division signals with different frequencies. Since the size frequency division signals with different frequencies represent signals with different ranging ranges and ranging accuracies, this application uses each size frequency division signal and a preset input signal to perform multiple positioning on the passive intermodulation device, obtaining the measured distances corresponding to each size frequency division signal. Then, by extracting the effective values of each measured distance and based on the effective value merging technology, the position of the passive intermodulation device is determined. That is, this application uses the effective value merging technology to perform simple calculations to quickly calculate the position of the passive intermodulation device, without the need for complex ranging calculations using the ordinary phase method, so the calculation time can be greatly reduced. In addition, this application improves the accuracy of passive intermodulation device positioning by separately extracting the effective values in the measured distances of each size frequency division signal as a part of the position of the passive intermodulation device and discarding the useless information in the measured distances. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0012] Figure 1 is a schematic flowchart of the first embodiment of the positioning method for a passive intermodulation device provided by this application;

[0013] Figure 2 is a schematic flowchart of the second embodiment of the positioning method for a passive intermodulation device provided by this application;

[0014] Figure 3 is a schematic structural diagram of the positioning system for a passive intermodulation device provided by this application;

[0015] Figure 4 is another schematic flowchart of the positioning method for a passive intermodulation device provided by this application;

[0016] Figure 5 is a schematic structural diagram of an electronic device according to an embodiment of this application. Detailed Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. In addition, it should be noted that for the convenience of description, only part of the structures related to the present application are shown in the drawings, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0018] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0019] The existence of passive intermodulation devices may lead to a decline in signal quality in the communication link. Therefore, in order to maintain the stability of the communication system, it is usually necessary to locate and monitor the passive intermodulation devices in the communication link so as to maintain and repair the communication system in a timely manner.

[0020] Generally, for the location of passive intermodulation devices in the communication link, there are mainly the following three types of technologies.

[0021] The first type of technology is the single-frequency phase method, which measures the distance by measuring the phase of the passive intermodulation signal at this frequency. Due to the periodic ambiguity of the phase, when using the single-frequency phase method for ranging, a periodic distance ambiguity problem usually occurs. During the ranging and positioning process, once there is a periodic distance ambiguity, the single-frequency phase method cannot accurately locate the passive intermodulation device.

[0022] The second type of technology is the time-domain reflectometry method, that is, it uses the reflection propagation delay of the passive intermodulation device signal for ranging and positioning. This method has high resolution and relatively accurate positioning, but it requires extremely large bandwidth and extremely high time synchronization accuracy; for achieving a positioning accuracy of the order of millimeters, the time-domain reflectometry method requires a clock synchronization accuracy of the femtosecond (fs) level. Therefore, the system design is difficult, complex, and the cost is also very high.

[0023] The third type of technology is the frequency-sweeping method. By continuously sweeping multiple frequency points within a large bandwidth, the spectral peak position of the frequency-swept signal of the passive intermodulation device is obtained to locate the passive intermodulation device. Although its accuracy is lower than that of the time-domain reflectometry method, compared with the single-frequency phase ranging, both the positioning accuracy and resolution ability of this technology have been improved to a certain extent. However, the spectral peak position of its frequency-swept signal is extremely susceptible to the influence of noise and bandwidth truncation. In addition, the continuous frequency sweeping of numerous frequency points results in a long positioning time and low efficiency, making it unsuitable for application in fast real-time positioning scenarios.

[0024] To solve the technical defects in the prior art, such as positioning ambiguity caused by using the single-frequency phase method for ranging, the extremely large bandwidth and extremely high time synchronization accuracy required by the time-domain reflectometry ranging technology, and the low efficiency, large occupation of frequency resources, and low positioning accuracy of the frequency-sweeping ranging technology, this application provides a method for positioning a passive intermodulation device. This method adopts a frequency division mechanism and has the following beneficial effects:

[0025] (1) Compared with the single-frequency phase method for ranging technology, this application eliminates the problem of periodic distance ambiguity. At the same time, it also solves the contradiction between the ranging range and the ranging accuracy, and still maintains high-precision positioning under large-range ranging.

[0026] (1) Compared with the time-domain reflectometry ranging technology, this application does not require high-precision time synchronization technology. Under the same ranging and positioning accuracy conditions, it greatly reduces the system design difficulty, complexity, and cost.

[0027] (2) Compared with the frequency-sweeping method for ranging technology, this application does not require frequency sweeping for ranging among numerous frequency points within a wide frequency band, greatly reducing the required frequency bandwidth and the number of frequency points. At the same time, it also reduces the frequency-sweeping time and improves the ranging and positioning efficiency.

[0028] That is, this application only needs to adopt three frequency division signals with specific designs to achieve large-range and high-precision ranging and positioning of the passive intermodulation device. Among them, the low-frequency band frequency division signal is used to expand the ranging and positioning range; the middle-frequency band frequency division signal is used to eliminate the distance periodic ambiguity; the high-frequency band frequency division signal is used to improve the ranging and positioning accuracy. Therefore, this application can achieve large-range and high-precision ranging and positioning of the passive intermodulation device, effectively breaking through the technical problems faced by the existing positioning technology, namely, large ranging range but low accuracy, and high accuracy but small ranging range.

[0029] The following provides a detailed introduction to the method for positioning the passive intermodulation device provided in this application. For details, please refer to Figure 1 , Figure 1 which is the schematic flowchart of the first embodiment of the method for positioning the passive intermodulation device provided in this application. The method includes:

[0030] Step 101: Generate multiple size frequency division signals with different frequencies.

[0031] Among them, according to different preset ranging ranges and ranging accuracies, the frequency of the size frequency division signal generated by the frequency division module can be adjusted to obtain size frequency division signals with multiple different frequencies.

[0032] Step 102: Use each size frequency division signal and the preset input signal to locate the passive intermodulation device, and obtain the measured distances corresponding to each size frequency division signal.

[0033] Among them, the preset input signal can be obtained from an external signal source, and the preset input signal can be a sine wave, a square wave or other types of signals with known frequencies and amplitudes.

[0034] The preset input signal can be a signal with a pre-initialized frequency. For example, the preset input signal can be a first frequency input signal with a frequency of 1820 MHz and a second frequency input signal with a frequency of 1880 MHz.

[0035] Exemplarily, the frequencies of each size frequency division signal can be 150 MHz, 15 MHz, 1.5 MHz, etc.

[0036] For example, the size frequency division signal of 150 MHz, the first frequency input signal of 1820 MHz, and the second frequency input signal of 1880 MHz are used to locate the passive intermodulation device to obtain the first measured distance; the size frequency division signal of 15 MHz, the first frequency input signal of 1820 MHz, and the second frequency input signal of 1880 MHz are used to locate the passive intermodulation device to obtain the second measured distance; the size frequency division signal of 1.5 MHz, the first frequency input signal of 1820 MHz, and the second frequency input signal of 1880 MHz are used to locate the passive intermodulation device to obtain the third measured distance.

[0037] Step 103: Extract the effective values of each measured distance, and based on the effective value merging technology, determine the position of the passive intermodulation device.

[0038] For example, extract the effective values of the first measured distance, the second measured distance, and the third measured distance respectively, and merge the multiple effective values to obtain the position of the passive intermodulation device.

[0039] This embodiment generates size frequency division signals of multiple different frequencies; since the size frequency division signals of different frequencies represent signals of different ranging ranges and ranging accuracies, therefore, the present application uses each size frequency division signal and a preset input signal to perform multiple localizations on the passive intermodulation device to obtain the measured distances corresponding to each size frequency division signal; then, by extracting the effective values of each measured distance and based on the effective value merging technology, the position of the passive intermodulation device is determined. That is, the present application can quickly calculate the position of the passive intermodulation device by performing simple operations using the effective value merging technology, without the need for complex ordinary phase method for ranging calculations, so the calculation time can be greatly reduced. In addition, the present application extracts the effective value of each measured distance of each size frequency division signal as a part of the position of the passive intermodulation device, discarding the useless information in the measured distance, thereby improving the accuracy of the passive intermodulation device localization.

[0040] Refer to Figure 2 , Figure 2 FIG. is a schematic flowchart of the second embodiment of the method for locating a passive intermodulation device provided by the present application. The second embodiment specifically includes the following steps.

[0041] Step 110: Obtain the preset input signal of the signal source.

[0042] Among them, the preset input signal of the signal source can be obtained from the outside. The preset input signal of the signal source can be a sine wave, a square wave or other types of signals with known frequencies and amplitudes.

[0043] In addition, the number of signal sources can be multiple, such as 2 or 3, preferably 2.

[0044] In some embodiments, after obtaining the preset input signal of the signal source, the frequency of the preset input signal can be initialized.

[0045] Step 120: Based on the preset ranging range and ranging accuracy, adjust the frequency of the size frequency division signal generated by the frequency division module to obtain size frequency division signals of multiple different frequencies.

[0046] Among them, the frequency division module can include a Direct Digital Synthesizer (DDS) and a Phase Locked Loop (PLL).

[0047] For example, direct digital synthesis technology can be used to excite phase-locked loop frequency synthesis technology to achieve frequency synthesis.

[0048] Among them, the preset rule of the size frequency division signals of multiple different frequencies can be: low-frequency band frequency division signals are used to expand the ranging and positioning range; medium-frequency band frequency division signals are used to eliminate distance cycle ambiguity; high-frequency band frequency division signals are used to improve the ranging and positioning accuracy.

[0049] Among them, the preset ranging range refers to the measurement distance range predetermined in advance according to the actual situation and requirements of the communication link before positioning the passive intermodulation device. For example, if it is necessary to locate a passive intermodulation device within 100 meters, then 100 meters can be considered as the preset ranging range.

[0050] Since it is necessary to ensure that the generated size frequency division signal can cover the preset ranging range and provide accurate measurement results within this range, the setting of the preset ranging range will affect the subsequent selection of the scale and the adjustment of the frequency of the frequency division signal. For example, if the preset ranging range is 100 meters, then a long scale may be a more appropriate choice because long scales are usually used for longer distance measurements.

[0051] The ranging accuracy refers to the minimum measurable distance change expected to be achieved during the measurement process or, in other words, the accuracy of the measurement result. For example, if it is desired to detect a distance change of 1 meter, then 1 meter is the ranging accuracy.

[0052] Since it is necessary to ensure that the generated size frequency division signal has sufficient resolution to detect the distance change of the accuracy, the ranging accuracy will also affect the selection of the scale and the adjustment of the frequency of the frequency division signal.

[0053] A scale is a measurement tool used to map the actual distance change to a measurable signal change. Different scales (such as a fine scale, a short scale, and a long scale) correspond to different measurement ranges and positioning accuracies.

[0054] Based on different preset ranging ranges and ranging accuracies, the corresponding scale can be selected, and then the frequency of the size frequency division signal can be adjusted based on the measurement characteristics of the scale to ensure the best measurement effect.

[0055] For example, if the preset ranging range is greater than 100 m, the selected scale is a long scale, and the ranging accuracy of the long scale is less than 1 meter, then the frequency of the size frequency division signal of the long scale can be selected as 1.3 MHz.

[0056] For example, if the preset ranging range is greater than 1 m, the selected scale is a short scale, and the ranging accuracy of the short scale is less than 0.1 meter, then the frequency of the size frequency division signal of the long scale can be selected as 15 MHz.

[0057] For example, if the preset ranging range is greater than 0.1 m, the selected scale is a fine scale, and the ranging accuracy of the fine scale is less than 0.01 meter, then the frequency of the size frequency division signal of the long scale can be selected as 150 MHz.

[0058] In some embodiments, the number of generated size frequency division signals can be determined according to the detection length of the cable to be measured.

[0059] For example, if the detection length of the cable to be measured is within 1000 meters, the number of size frequency division signals can be 4; if the detection length of the cable to be measured is within 100 meters, the number of size frequency division signals can be 3; if the detection length of the cable to be measured is within 10 meters, the number of size frequency division signals can be 2.

[0060] It should be noted that the number of size frequency division signals is also related to the ranging accuracy. For example, the number of size frequency division signals for a cable to be measured with a detection length within 100 meters can also be 2. Exemplarily, the position of the passive intermodulation device can be accurate only to the tenths place, so that only 2 size frequency division signals can be used, while if the position of the passive intermodulation device is accurate to the hundredths place, 3 size frequency division signals can be used. It can be determined according to the actual situation, and this application does not make any limitations here.

[0061] Step 130: Based on the preset input signal, use each size frequency division signal to locate the passive intermodulation device respectively, and obtain the measured distance corresponding to each size frequency division signal.

[0062] Among them, step 130 may include steps 131 to 133:

[0063] Step 131: Based on the preset input signal and each size frequency division signal, obtain the reference signal corresponding to each size frequency division signal, and the measured signal output corresponding to the cable to be measured.

[0064] Step 132: Based on the frequency division signal phase difference calculation module in the microcontroller, determine the phase difference between the reference signal and the measured signal corresponding to each size frequency division signal among each size frequency division signal, and obtain the measured distance corresponding to each size frequency division signal.

[0065] Step 133: Based on the mapping relationship between the phase difference and the propagation wavelength and the propagation distance of the size frequency division signal in the cable to be measured, and then through the distance calculation and processing unit of the microcontroller, obtain the measured distance corresponding to each size frequency division signal.

[0066] Among them, the mapping relationship between the phase difference and the propagation wavelength of the size frequency division signal in the cable to be measured can refer to the formula Among them, c is the speed of light wave propagation in air, V p is the propagation speed factor of the electromagnetic wave in the medium; is the phase difference, L is the measured distance; f is the frequency of the size frequency division signal; λ is the propagation wavelength of the size frequency division signal in the cable to be measured.

[0067] For steps 131 to 133, the specific content can refer to the relevant statements in the following embodiments.

[0068] Step 140: Use the microcontroller to extract the effective value of the measured distance corresponding to each size frequency division signal respectively.

[0069] Specifically, the wavelength of each size-divided frequency signal can be determined based on its frequency, and the precise positions of each scale can be preliminarily determined based on the size of the wavelength. Then, the effective values of the measured distances corresponding to each size-divided frequency signal can be extracted respectively according to the precise positions of each scale.

[0070] For example, if the size-divided frequency signal is 150 MHz and the phase difference is 0.25π, the measured distance is 0.125 m. Based on the frequency of the size-divided frequency signal being 150 MHz, the wavelength can be obtained to be approximately 2 meters. Then, the effective values of the measured distances corresponding to the size-divided frequency signal with a wavelength of 2 meters can be the values corresponding to the tenths and hundredths places.

[0071] Step 150: Based on the effective values of the measured distances corresponding to each size-divided frequency signal, use the effective value merging technique to obtain the specific position of the passive intermodulation device.

[0072] Among them, the effective value merging technique refers to merging the effective values of multiple measurement values to obtain more accurate and reliable results.

[0073] For example, if the effective values of the measured distances corresponding to each size-divided frequency signal are 30 m and 0.2 m respectively, then 30 m and 0.2 m can be added together to obtain the specific position of the passive intermodulation device as 30.2 m.

[0074] In this embodiment, by adjusting the frequencies of the size-divided frequency signals generated by the frequency division module, multiple size-divided frequency signals with different frequencies are obtained. Among them, the low-frequency band size-divided frequency signal is used to expand the ranging and positioning range; the medium-frequency band size-divided frequency signal is used to eliminate the distance cycle ambiguity; the high-frequency band size-divided frequency signal is used to improve the ranging and positioning accuracy. Since size-divided frequency signals with different frequencies represent signals with different ranging ranges and ranging accuracies, therefore, in this application, signals with different ranging ranges and ranging accuracies are used to locate the passive intermodulation device existing in the cable to be measured multiple times, and the measured distances corresponding to the passive intermodulation device for each size-divided frequency signal are obtained. Then, by simply calculating the measured distances corresponding to the passive intermodulation device for each size-divided frequency signal, the position of the passive intermodulation device can be quickly calculated. Therefore, the calculation time can be greatly reduced, thereby improving the problem in the related technology that a long calculation time is consumed due to using the complex frequency sweeping method for ranging.

[0075] In addition, in this application, by separately extracting the effective values in the measured distances of each size-divided frequency signal as a part of the position of the passive intermodulation device, and finally merging and combining the effective values corresponding to all size-divided frequency signals respectively, the precise position of the passive intermodulation device is obtained. That is, in this application, by extracting the effective values from the ranging results obtained by changing the signal frequency each time and discarding the data information with low accuracy in the scale, the positioning accuracy of the passive intermodulation device is improved.

[0076] In some embodiments, when positioning passive intermodulation devices to be measured within 100 meters in a communication link, three rulers with different ranges are required. Each size frequency-divided signal includes a first size frequency-divided signal, a second size frequency-divided signal, and a third size frequency-divided signal. Then, step 140 may include the following steps:

[0077] Step 141: Extract the value of the first preset position from the measured distance of the first size frequency-divided signal as the first effective value.

[0078] For example, if the first size frequency-divided signal is 150 MHz, the phase difference obtained in step 132 is 0.25π, the measured distance is 0.125 m, and the positioning accuracy of the first size frequency-divided signal is 0.0028 m, then extract the percentile value 0.02 m of the measured distance as the first effective value.

[0079] Step 142: Extract the value of the second preset position from the measured distance of the second size frequency-divided signal as the second effective value.

[0080] For example, if the second size frequency-divided signal is 15 MHz, the phase difference obtained in step 132 is 0.025π, the measured distance is 0.125 m, and the positioning accuracy of the second size frequency-divided signal is 0.028 m, then extract the tenth value 0.100 m of the measured distance as the second effective value.

[0081] Step 143: Extract the value of the third preset position from the measured distance of the third size frequency-divided signal as the third effective value.

[0082] For example, if the third size frequency-divided signal is 1.5 MHz, the phase difference obtained in step 132 is 1.0025, the measured distance is 50.125 m, and the positioning accuracy of the third size frequency-divided signal is 0.28 m, then extract the units and tens values of the measured distance, i.e., 50.000 m, as the third effective value.

[0083] For the frequencies corresponding to the first size frequency-divided signal, the second size frequency-divided signal, and the third size frequency-divided signal in steps 141 to 143, they can be set according to the actual situation. The first preset position, the second preset position, and the third preset position need to be correspondingly set according to the selected frequencies of the first size frequency-divided signal, the second size frequency-divided signal, and the third size frequency-divided signal. In addition, the number of preset positions of the first preset position, the second preset position, and the third preset position can be 1, 2, or 3 (for example, the first preset position listed above is the percentile, and the third preset position includes the units and tens). Specifically, it can be selected according to the actual situation, and the present application does not limit this here.

[0084] Step 144: Combine the first effective value, the second effective value, and the third effective value to obtain the position of the passive intermodulation device in the cable under test.

[0085] That is, combine the first effective value of 0.02 m, the second effective value of 0.100 m, and the third effective value of 50.000 m to obtain the position of the passive intermodulation device in the cable under test as 50.12 m.

[0086] In some embodiments, only two effective values can be set. For example, only the second effective value of 0.100 m and the third effective value of 50.000 m in the above embodiment can be selected for combination to obtain the position of the passive intermodulation device in the cable under test = 0.100 m + 50.000 m = 50.1 m.

[0087] In addition, in some embodiments, if it is necessary to locate the passive intermodulation device within 1000 m, four scales can be set. For example, the measurement distances corresponding to the four scales are X1 = 250.500 m, X2 = 50.125 m, X3 = 7.650 m, and X4 = 0.835 m respectively. Then, the percentile of 200.000 m in X1 can be extracted as the first effective value, the tens digit of 50.000 m in X2 can be extracted as the second effective value, the units digit of 7.000 m in X3 can be extracted as the third effective value, and the tenth digit of 0.800 m in X4 can be extracted as the fourth effective value. Combine the first effective value of 200 m, the second effective value of 50 m, the third effective value of 7 m, and the fourth effective value of 0.8 m to obtain the position of the passive intermodulation device in the cable under test = 200.000 m + 50.000 m + 7.000 m + 0.800 m = 257.8 m.

[0088] It should be noted that the numerical values listed in the embodiments of the present application are only for illustrative purposes, and the specific magnitudes of the numerical values should be determined according to the actual situation.

[0089] In some embodiments, the preset input signal of the signal source includes a first frequency input signal and a second frequency input signal. Step 131 includes the following processes:

[0090] 1) Obtain an amplitude-modulated signal based on the first frequency input signal and the size frequency division signal.

[0091] Among them, the frequency of the first frequency input signal can be initially set to 1820 MHz, and the size frequency division signal can be 150 MHz, 15 MHz, 1.5 MHz, etc.

[0092] For example, the first frequency input signal of 1820 MHz and the size frequency division signal of 150 MHz can be amplitude-modulated to obtain an amplitude-modulated signal.

[0093] 2) Filter and amplify the amplitude-modulated signal to obtain an amplified first frequency input signal.

[0094] Among them, the amplitude-modulated signal can be filtered first to obtain a lower sideband signal, and then the lower sideband signal can be filtered and amplified to obtain an amplified first-frequency input signal.

[0095] 3) Amplify the second-frequency input signal to obtain an amplified second-frequency input signal.

[0096] Among them, the frequency of the second-frequency input signal can be initialized to 1880 MHz first.

[0097] It should be noted that the frequency selection of the second-frequency input signal and the first and second-frequency input signals is related to the transmission frequency band of the communication device.

[0098] 4) Based on the amplified first-frequency input signal and the amplified second-frequency input signal, obtain a first two-tone signal and a second two-tone signal with the same frequency.

[0099] Among them, the amplified first-frequency input signal and the amplified second-frequency input signal can be combined first to obtain a two-tone signal, and then the two-tone signal can be input into a forward coupler to separate two two-tone signals with the same frequency components, namely the first two-tone signal and the second two-tone signal.

[0100] 5) Based on the first two-tone signal and the second two-tone signal, respectively obtain a reference signal corresponding to the size frequency division signal and a measurement signal generated by the passive intermodulation device in the cable under test.

[0101] Among them, 5) may include the following processes:

[0102] 5-1) Perform passive mixing operation on the first two-tone signal to obtain a reference passive intermodulation signal.

[0103] Among them, the first two-tone signal can be input into a passive mixer to perform passive mixing operation to obtain a reference passive intermodulation signal.

[0104] 5-2) Based on the reference passive intermodulation signal, obtain a third-order passive intermodulation reference signal.

[0105] Among them, the reference passive intermodulation signal can be input into a band-pass filter to extract a third-order passive intermodulation reference signal. For example, a third-order passive intermodulation reference signal with a frequency of 1460 MHz can be extracted.

[0106] 5-3) Input the second two-tone signal into the cable under test to obtain a passive intermodulation signal output from the cable under test.

[0107] Among them, the second two-tone signal can be input into a duplexer first, and then the second two-tone signal output from the duplexer can be input into the cable under test.

[0108] Then, a passive intermodulation signal output from the cable under test is received at the receiving port of the diplexer. At this time, the phase of the output passive intermodulation signal is different from the phase when it enters the input cable, and the generated phase change contains the position information of the passive intermodulation device.

[0109] 5-4) Obtain the third-order passive intermodulation signal of the passive intermodulation signal.

[0110] Among them, the passive intermodulation signal can be first input into a low-noise amplifier for amplification.

[0111] Then, the amplified passive intermodulation signal is input into a band-pass filter to obtain the third-order passive intermodulation signal.

[0112] 5-5) Respectively obtain the reference signal and the measurement signal corresponding to the size frequency division signal based on the third-order passive intermodulation reference signal and the third-order passive intermodulation signal.

[0113] Among them, 5-5) can specifically include the following processes:

[0114] (1) Obtain the local oscillator signal.

[0115] Among them, the local oscillator signal can be obtained externally.

[0116] The frequency of the local oscillator signal can be determined based on the first frequency input signal, the second frequency input signal, and the size frequency division signal.

[0117] For example, if the frequency f1 of the first frequency input signal is 1820 MHz, the frequency f2 of the second frequency input signal is 1880 MHz, and the size frequency division signal f0 is 150 MHz, then the local oscillator signal f3 can adopt the formula: f3 = f0 + (2 * (f1 - f0) - f2).

[0118] Among them, (f1 - f0) is the frequency of the lower sideband signal obtained by modulating f0 and f1.

[0119] (2) Perform down-conversion operation on the local oscillator signal and the third-order passive intermodulation reference signal to obtain the mixed-frequency reference signal.

[0120] Among them, the local oscillator signal and the third-order passive intermodulation reference signal can be input into a down-converter for down-conversion operation to obtain the mixed-frequency reference signal.

[0121] (3) Perform low-pass filtering on the mixed-frequency reference signal to obtain the reference signal corresponding to the size frequency division signal.

[0122] Among them, the mixed-frequency reference signal can be input into a low-pass filter for low-pass filtering to obtain the reference signal corresponding to the size frequency division signal.

[0123] (4) Mix the third-order passive intermodulation signal with the local oscillator signal to perform down-conversion operation, obtaining a mixed-frequency signal.

[0124] Similarly, the third-order passive intermodulation signal and the local oscillator signal can be input into a down-converter to perform down-conversion operation, obtaining a mixed-frequency signal.

[0125] (5) Perform low-pass filtering on the mixed-frequency signal to obtain a measurement signal corresponding to the size frequency division signal.

[0126] Similarly, the mixed-frequency signal can be input into a low-pass filter to perform low-pass filtering, obtaining a measurement signal corresponding to the size frequency division signal.

[0127] In some related passive intermodulation technical solutions, an instrument is often used to perform Fourier transform on a high-frequency signal to obtain signal phase information. However, this method will result in low phase discrimination accuracy and long program running and processing time, which is not conducive to the real-time detection of the positioning system.

[0128] In this application, before sampling the signal, the signal is first down-converted by a down-converter, that is, the local oscillator signal and the third-order signal (such as the third-order passive intermodulation signal and the third-order passive intermodulation reference signal) are down-converted. This can not only perform detection on the signal but also reduce the frequency of the signal. Thus, the microcontroller can directly perform phase discrimination analysis on the signal, effectively reducing the dependence on the analog-to-digital converter. Only a general analog-to-digital conversion device is needed to complete the sampling work, without the need to use expensive or precision instruments to participate in positioning, making the entire positioning system low-cost and convenient for deployment and installation in places such as base stations.

[0129] Combined with the above embodiments, it can be seen that the positioning method of the passive intermodulation device provided by this application mainly includes process steps 1-step 23:

[0130] Before introducing steps 1-step 23, a simple explanation of the ranging principle of the phase method is given first.

[0131] The ranging by the phase method is to indirectly measure the time t required for the modulated signal to travel back and forth on the measured distance by measuring the phase delay to calculate the distance L. The relationship between the distance and the phase of the test signal can be expressed as:

[0132] Among them,

[0133] Substituting (2) into (1) gives

[0134] Among them, c is the speed of light wave propagation in the air; is the phase difference generated by the modulated optical signal passing through the measured distance L; f is the modulation frequency of the signal; λ is the wavelength of the modulation wave; N is a positive integer.

[0135] As can be seen from (3), as long as the phase difference between the transmitted and received signals can be measured, the value of the distance L can be determined. However, N cannot be directly determined by phase-based distance measurement.

[0136] Therefore, the following discussion is only carried out under the condition of N = 0. Obviously, when it is time, the L distance can be determined as:

[0137] As can be seen from (4), theoretically, the factors affecting the ranging accuracy mainly include the speed of light, the modulation frequency f, and the error brought by phase measurement. Among them, the speed of light can be ignored, and the other two depend on the performance of the circuit system. Therefore, in the entire positioning system, the frequency generation circuit and the phase measurement circuit are relatively important and directly affect the measurement accuracy.

[0138] In addition, there is a concept of ambiguous distance in single-frequency continuous-wave phase ranging. That is when it does not exceed 2π, the measurement of the phase difference is unambiguous, corresponding to the case of N = 0 described above. From this, the maximum unambiguous distance can be obtained as

[0139] Based on the above determined maximum unambiguous distance, the present application can further determine the frequencies of each scale and adjust the size division signals corresponding to each scale. Specifically, the following steps 1-step 23 can be referred to.

[0140] Step 1: Adjust the size division signal according to the specific situation of the communication link.

[0141] Among them, the frequency of the size division signal can be f0, f 短 = f0 / M and f 长 = f0 / N, where M and N are counters, and f0, f 短 = f0 / M and f 长 = f0 / N correspond to the frequencies of the fine scale, short scale, and long scale respectively.

[0142] For example, when locating passive intermodulation devices within 100 meters in a communication link, it is necessary to allocate three scales with different ranges. How to adjust the frequencies of each scale can be specifically referred to the following:

[0143] 1-1) Determine the frequency of the long scale.

[0144] When the preset ranging range is greater than 100m, the maximum measured value of the unambiguous distance λ2 of the long scale should satisfy: meters.

[0145] Generally, a long scale is used to provide accurate values for the tens and units digits of the measured distance. That is, the units digit provided by the long scale should be an accurate value. Therefore, the measurement error of the long scale should be less than 1. When a phase detection device with a precision of 1 / 360 is used, the precision of 1 / 360 should satisfy being less than 1 m. So m.

[0146] In summary, when selecting the half-wavelength of the long scale, it should satisfy

[0147] According to where c = 3 * 10^8 m / s, the frequency range of the long scale can be calculated as 0.42 MHz < f 长 < 1.5 MHz.

[0148] 1 - 2) Determine the frequency of the short scale.

[0149] When the preset ranging range is greater than 1 m, the maximum measured value of the unambiguous distance of the short scale should satisfy m.

[0150] Assume that the short scale is used to provide the valid value for the tenths place (i.e., the first digit after the decimal point). Then the precision of the short scale should satisfy the condition that the tenths place is a valid value. From this, it can be inferred that the minimum measured value of the short scale should satisfy: m.

[0151] Then the half-wavelength of the short scale is

[0152] Similarly, according to where c = 3 * 10^8 m / s, the frequency range of the short scale can be calculated as 4.2 MHz < f 短 < 150 MHz.

[0153] 1 - 3) Determine the frequency of the fine scale.

[0154] When the preset ranging range is greater than 0.1 m, the maximum measured value of the unambiguous distance of the fine scale should satisfy:

[0155] Assume that the fine scale is used to provide the valid value for the hundredths place. Then the precision of the fine scale should satisfy the condition that the hundredths place is a valid value. From this, it can be inferred that the precision of the fine scale should satisfy: m.

[0156] Then the half-wavelength of the fine scale is

[0157] According to where c = 3 * 10^8 m / s, the frequency range of the fine scale can be calculated as 42 MHz < f0 < 1500 MHz.

[0158] When the above conditions are met simultaneously, the size frequency division signal can be set to f0 = 150 MHz, f 短 = f0 / M = 15 MHz, and f 长 = f0 / N = 1.5 MHz.

[0159] Based on the frequencies of the size frequency division signals determined in Step 1, the passive intermodulation devices in the cable under test can be located. Refer to the following Steps 2 - 20 and combine with Figure 3 . As Figure 3 shown, the passive intermodulation device positioning system 100 includes a frequency division module 10, a microcontroller 20, a modulator 30, a band-pass filter 40, an amplifier 50, a combiner 60, a forward coupler 70, a duplexer 80, a passive mixer 90, a low-noise amplifier 11, a downconverter 12, a low-pass filter 13, an analog-to-digital converter 14, a cable under test 15, and a passive intermodulation device 16.

[0160] Step 2: The microcontroller 20 initializes the frequencies of the first frequency input signal f1 and the second frequency input signal f2 to 1820 MHz and 1880 MHz respectively, adjusts the frequency of the size frequency division signal f0 to 150 MHz, and the frequency of the local oscillator signal f3 to 1610 MHz.

[0161] Step 3: Input the first frequency input signal f1 and the frequency division signal f0 into the modulator 30 for amplitude modulation to obtain an amplitude-modulated signal.

[0162] Among them, the signal frequencies existing in the signal are 1670 MHz and 1970 MHz respectively.

[0163] Step 4: The amplitude-modulated signal passes through the band-pass filter 40 to obtain a lower sideband signal with a frequency of 1670 MHz.

[0164] Step 5: The lower sideband signal obtained by passing through the band-pass filter 40 is amplified in the amplifier 50 to obtain a filtered amplitude-modulated signal, that is, the amplified first frequency input signal mentioned above.

[0165] Step 6: Input the second frequency input signal f2 into the amplifier 50 for amplification to obtain an amplified second frequency input signal.

[0166] Step 7: Input the amplified second frequency input signal, that is, the amplified second frequency input signal, and the amplitude-modulated signal amplified in Step 5 (i.e., the amplified first frequency input signal) into the combiner 60 to obtain a two-tone signal with frequencies of 1670 MHz and 1880 MHz respectively.

[0167] Step 8: Input the dual-tone signal into the forward coupler 70 to separate two dual-tone signals with the same frequency components. One of the dual-tone signals (i.e., the first dual-tone signal) is input into the passive mixer 90, and a reference passive intermodulation signal is obtained through passive mixing operation. At the same time, the other dual-tone signal (i.e., the second dual-tone signal) is input into the duplexer 80.

[0168] Step 9: Input the reference passive intermodulation signal into the band-pass filter 40 to extract the third-order passive intermodulation reference signal with a frequency of 1460 MHz.

[0169] Step 10: Input the third-order passive intermodulation reference signal and the local oscillator signal f3 into the down-converter 12 for mixing operation to obtain a mixed reference signal.

[0170] Step 11: Pass the mixed reference signal obtained in Step 10 through the low-pass filter 13 to obtain a reference signal, where the frequency of the reference signal is 2*f1 - f2.

[0171] The phase information of the reference signal is the phase information of the size frequency division signal.

[0172] Step 12: Input the second dual-tone signal output from the duplexer 80 in Step 8 into the cable under test 15.

[0173] Step 13: Receive the passive intermodulation signal output from the cable under test 15 at the receiving port of the duplexer 80.

[0174] Among them, the phase of the output passive intermodulation signal is different from the phase when it is input into the cable under test 15, and the phase change generated contains the position information of the passive intermodulation device.

[0175] Step 14: Input the passive intermodulation signal in Step 13 into the low-noise amplifier 11 for amplification.

[0176] Step 15: Input the amplified passive intermodulation signal into the band-pass filter 40 to obtain a third-order passive intermodulation signal.

[0177] Step 16: Input the local oscillator signal and the third-order passive intermodulation signal into the down-converter 12 for down-conversion operation to obtain a mixed signal.

[0178] Step 17: Input the mixed signal into the low-pass filter 13 to obtain a measurement signal corresponding to the size frequency division signal f0.

[0179] Step 18: Use the analog-to-digital converter 14 to sample the reference signal and the measurement signal respectively.

[0180] Step 19: The microcontroller 20 performs all-phase fast Fourier transform on the two sampled signals (i.e., the reference signal and the measurement signal) respectively to obtain the phases of the two signals and calculate the phase difference.

[0181] Step 20: Calculate the measurement distance of the passive intermodulation device in the cable under test when the size frequency division signal f0 is 150 MHz through the phase difference. When calculating that the size frequency division signal f0 is 150 MHz, obtain the measurement distance of the passive intermodulation device in the cable under test.

[0182] Since the size frequency division signal f0 is 150 MHz, the percentile value of this measurement distance can be selected as the effective distance, and the values of other digits are discarded or set to zero.

[0183] For example, if the phase difference obtained at this time is 0.25π, then when the size frequency division signal f0 is 150 MHz, the measurement distance D0 of the passive intermodulation device 16 in the cable under test 15 is:

[0184]

[0185] Assume that the accuracy of the phase discriminator used is 1 / 360, then the positioning accuracy of f0 at this time is:

[0186]

[0187] Retain the percentile value of this measurement distance as the effective value D0 = 0.02 m.

[0188] After calculating the measurement distance and the effective value when the size frequency division signal f0 is 150 MHz, switch to the low-frequency signal to obtain the measurement signals of other ranges.

[0189] Step 21: The microcontroller 20 initializes the frequencies of the first frequency input signal f1 and the second frequency input signal f2 to 1820 MHz and 1880 MHz respectively, and adjusts the size frequency division signal f0 to f 短 = f0 / M = 15 MHz, and the frequency f3 of the local oscillator signal is 1745 MHz.

[0190] According to the above calculation process, the phase difference when the frequency of the size frequency division signal f 短 is 15 MHz can be obtained as 0.025π, then the measurement distance when the frequency of the size frequency division signal f 短 is 15 MHz is:

[0191]

[0192] Since the frequency of the size frequency division signal f 短 is 15 MHz, its positioning accuracy of the size frequency division signal f 短 is:

[0193] Assume that the tenth digit value of this measurement distance is retained as the effective value D1 = 0.100 m.

[0194] Step 22: The microcontroller 20 initializes the frequencies of the first frequency input signal f1 and the second frequency input signal f2 to be 1820 MHz and 1880 MHz respectively, adjusts the frequency of the dimension division signal f0 to be 1.5 MHz, and the local oscillator signal frequency f3 to be 1745 MHz.

[0195] According to the above calculation process, when the frequency of the dimension division signal f0 is 1.5 MHz, the phase difference obtained is 1.0025π. Then the measured distance when the frequency of the dimension division signal f0 is 1.5 MHz is:

[0196]

[0197] Since the frequency of the dimension division signal f0 is 1.5 MHz, the positioning accuracy of the dimension division signal f0 is:

[0198] Assume that the ones and tens digits of this measured distance are retained as the effective value D2 = 50.000 m.

[0199] Step 23: By combining the effective values in the measured distances obtained in Steps 20 - 22, the accurate position of the passive intermodulation device 16 can be obtained as D = D2 + D1 + D0 = 50.12 m.

[0200] In summary, in this application, the measurement tasks for different distances are assigned to signals with different frequencies (i.e., the dimension division signal) for measurement, so that high - frequency signals are responsible for improving the positioning accuracy, and low - frequency signals are responsible for expanding the ranging range, thereby improving the high - precision positioning of the passive intermodulation device in the cable to be measured within a large range.

[0201] In addition, the devices in the passive intermodulation device positioning device provided in this application are ordinary devices, with a simple structure and no need for large and expensive devices or instrument equipment. That is, the passive intermodulation device positioning device provided in this application has the advantage of low cost.

[0202] In some embodiments, the passive mixer 90 may include a mixing diode for generating a reference intermodulation signal. Since the mixing diode is simple to obtain and has a low cost, using the mixing diode to generate the reference intermodulation signal can simplify the structure of the passive intermodulation device positioning system 100.

[0203] In addition, the microcontroller provided in this application is used to execute the positioning method of the passive intermodulation device provided in any of the foregoing method embodiments.

[0204] Based on the content of the above - mentioned embodiments, combined with Figure 4 , the positioning method of the passive intermodulation device provided in this application may include the following steps:

[0205] S1: Signal source input.

[0206] Among them, the signal source can be input from the outside. The preset input signals of the signal source can include a first frequency input signal of 1820 MHz and a second frequency input signal of 1880 MHz.

[0207] S2: Obtain the measured distance when the scale signal frequency is f0.

[0208] Among them, the scale signal frequency f0 is the size frequency division signal f0, which can be 150 MHz.

[0209] According to the scale signal frequency f0 being 150 MHz, the measured distance of f0 can be obtained as D0.

[0210] Such as

[0211] S3: Determine whether the first distance measurement is completed. If so, execute S4; if not, return to execute S2.

[0212] Among them, the first distance measurement refers to the distance measurement process using the scale signal frequency of f0 in S2. When this distance measurement process cannot be completed, the system will return to execute S2 to perform distance measurement again until the distance measurement is successful.

[0213] S4: Take the percentile value of the current measured distance.

[0214] For example, if the measured distance of f0 is D0 = 0.125 m, then the percentile value of 0.02 m can be taken as the first effective value.

[0215] S5: Obtain the measured distance when the scale signal frequency is f0 / M.

[0216] Among them, the scale signal frequency f0 / M can be the size frequency division signal f 短 = f0 / M. For example, f 短 = f0 / M = 15 MHz, and M is a counter.

[0217] According to the scale signal frequency f0 / M being 15 MHz, the measured distance of f0 / M can be obtained as

[0218]

[0219] S6: Determine whether the second distance measurement is completed. If so, execute S7; if not, return to execute S5.

[0220] Among them, the second distance measurement refers to the distance measurement process using the scale signal frequency of f0 / M in S5. When this distance measurement process cannot be completed, the system will return to execute S5 to perform distance measurement again until the distance measurement is successful.

[0221] S7: Obtain the tenth digit value of the current measured distance.

[0222] For example, the tenth digit value 0.100 m can be extracted from the current measured distance, i.e., the measured distance 0.125 of f0 / M, as the second valid value.

[0223] S8: Obtain the measured distance with the scale signal frequency of f0 / N.

[0224] Among them, obtaining the scale signal frequency f0 / N can be f 长 = f0 / N. For example, f0 / N is 1.5 MHz and N is a counter.

[0225] According to the scale signal frequency f0 / N being 1.5 MHz, the measured distance of f0 / N is

[0226]

[0227] S9: Determine whether the third distance measurement is completed. If so, execute S8. If not, return to execute S10.

[0228] Among them, the second distance measurement refers to the distance measurement process using the scale signal frequency of f0 / N in S8. When this distance measurement process cannot be completed, the system will return to execute S8 to perform distance measurement again until the distance measurement is successful.

[0229] S10: Obtain the tens and units digit values of the current measured distance.

[0230] For example, extract 50.000 m from the measured distance 50.125 m of f0 / N and use 50.000 m as the third valid value.

[0231] After obtaining the tens and units digit values of the current measured distance, the above operations are ended, and the extracted hundredth digit value, tenth digit value, and tens and units digit values are combined to obtain the accurate position of the passive intermodulation device as D = D2 + D1 + D0 = 50.12 m.

[0232] Among them, there are some factors that may cause the above distance measurement process not to be completed. For example, 1) Signal problem: If the scale signal frequency is unstable or interfered, it may cause inaccurate or impossible distance measurement. 2) Equipment problem: The distance measurement equipment may have faults or errors, resulting in inaccurate distance measurement. For example, the sensor may be damaged, insensitive, or there may be problems with the communication with the scale. 3) Operation problem: During the execution of the distance measurement process, there may be improper operations or incorrect settings. For example, the equipment is not correctly aligned with the scale, or the parameters are set incorrectly, resulting in impossible distance measurement. 4) Out of range: If the distance corresponding to the scale signal frequency exceeds the measurement range of the equipment, the distance measurement will also be impossible to complete.

[0233] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of an embodiment of an electronic device provided by the present application. The electronic device 80 includes a memory 81 and a processor 82. Among them, a computer program is stored on the memory 81; when the processor 82 executes the computer program, it is used to implement the positioning method of the passive intermodulation device provided by any one of the foregoing method embodiments.

[0234] The present application also provides a computer-readable storage medium, which is used to store a computer program. When the computer program is executed by a processor, it is used to implement the following method steps:

[0235] Obtain a preset input signal of a signal source;

[0236] Based on a preset ranging range and ranging accuracy, adjust the frequency of the size frequency division signal generated by the frequency division module to obtain a plurality of size frequency division signals with different frequencies;

[0237] Based on the preset input signal, respectively use each size frequency division signal to locate the passive intermodulation device to obtain the measured distances corresponding to each size frequency division signal;

[0238] Based on a microcontroller, use the phase difference calculation module in the microcontroller and the mapping relationship between the phase difference and the wavelength to respectively extract the effective values of the measured distances corresponding to each size frequency division signal;

[0239] Based on the effective values of the measured distances corresponding to each size frequency division signal, adopt the merging technology of the effective values to obtain the specific position of the passive intermodulation device.

[0240] It can be understood that when the computer program is executed by the processor, it is also used to implement the technical solutions of any embodiment in the present application.

[0241] In several embodiments provided by the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0242] 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 may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0243] In addition, in various embodiments of the present application, each functional unit may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0244] If the integrated unit in the above-mentioned other embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods in various embodiments of the present application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0245] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A positioning method for a passive intermodulation device, characterized in that The method includes: generating multiple size frequency division signals with different frequencies; using each of the size frequency division signals and a preset input signal to locate the passive intermodulation device, and obtaining the measurement distances corresponding to the size frequency division signals; extracting the effective values of the measurement distances, and determining the position of the passive intermodulation device based on the effective value merging technique.

2. The method according to claim 1, wherein The step of using each of the size frequency division signals and the preset input signal to locate the passive intermodulation device and obtaining the measurement distances corresponding to the size frequency division signals includes: using each of the size frequency division signals and the preset input signal to locate the passive intermodulation device, and obtaining a reference signal and a measurement signal corresponding to each of the size frequency division signals; determining the phase difference between the reference signal and the measurement signal corresponding to each size frequency division signal in each of the size frequency division signals; obtaining the measurement distances corresponding to the size frequency division signals based on the phase difference.

3. The method according to claim 2, wherein The preset input signal includes a first frequency input signal and a second frequency input signal; the step of using the preset input signal and each of the size frequency division signals to locate the passive intermodulation device and obtaining a reference signal and a measurement signal corresponding to each of the size frequency division signals includes: obtaining an amplitude modulation signal based on the first frequency input signal and the size frequency division signal; filtering and amplifying the amplitude modulation signal to obtain an amplified first frequency input signal; amplifying the second frequency input signal to obtain an amplified second frequency input signal; obtaining a first two-tone signal and a second two-tone signal with the same frequency based on the amplified first frequency input signal and the amplified second frequency input signal; respectively obtaining the reference signal and the measurement signal corresponding to the size frequency division signal based on the first two-tone signal and the second two-tone signal.

4. The method according to claim 3, wherein The step of respectively obtaining the reference signal and the measurement signal corresponding to the size frequency division signal based on the first two-tone signal and the second two-tone signal includes: performing a passive mixing operation on the first two-tone signal to obtain a reference passive intermodulation signal; obtaining a third-order passive intermodulation reference signal based on the reference passive intermodulation signal; inputting the second two-tone signal into the passive intermodulator to obtain a passive intermodulation signal; obtaining the third-order passive intermodulation signal of the passive intermodulation signal; respectively obtaining the reference signal and the measurement signal corresponding to the size frequency division signal based on the third-order passive intermodulation reference signal and the third-order passive intermodulation signal.

5. The method according to claim 4, characterized in that The step of respectively obtaining the reference signal and the measurement signal corresponding to the size frequency division signal based on the third-order passive intermodulation reference signal and the third-order passive intermodulation signal includes: obtaining a local oscillator signal; performing a down-conversion process on the local oscillator signal and the third-order passive intermodulation reference signal to obtain a mixed reference signal; performing a low-pass filtering process on the mixed reference signal to obtain a reference signal corresponding to the size frequency division signal; and performing a down-conversion process on the third-order passive intermodulation signal and the local oscillator signal to obtain a mixed signal; performing a low-pass filtering process on the mixed signal to obtain a measurement signal corresponding to the size frequency division signal.

6. The method according to claim 5, characterized in that, Determine the frequency of the local oscillator signal based on the first frequency input signal, the second frequency input signal, and the size frequency division signal.

7. The method according to claim 1, wherein The frequency of the size frequency division signal is determined by the ranging range and the ranging accuracy, and the number of the size frequency division signals is determined by the length of the cable to be measured and the ranging accuracy.

8. The method according to claim 1, characterized in that, Each of the size frequency division signals includes a first size frequency division signal, a second size frequency division signal, and a third size frequency division signal; The method for extracting the effective value of each measured distance and determining the position of the passive intermodulation device based on the effective value merging technique includes: Extract the value at a first preset position from the measured distance of the first size frequency division signal as the first effective value; Extract the value at a second preset position from the measured distance of the second size frequency division signal as the second effective value; Extract the value at a third preset position from the measured distance of the third size frequency division signal as the third effective value; Merge the first effective value, the second effective value, and the third effective value to obtain the position of the passive intermodulation device.

9. The method according to claim 8, wherein The merging of the first effective value, the second effective value, and the third effective value includes: Taking the first effective value as the percentile of the position value of the passive intermodulation device, taking the second effective value as the tenth place of the position value of the passive intermodulation device, and taking the third effective value as the units and tens places of the position value of the passive intermodulation device.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1-8 can be implemented.

Images