CN117056875B - Cable transmission performance analysis method and device based on test data - Google Patents
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Abstract
The invention discloses a cable transmission performance analysis method and device based on test data, and relates to the technical field of cable transmission performance analysis. The cable transmission performance analysis method and device based on the test data comprises three steps of calculating a cable working data predicted value, measuring a cable working data true value, verifying and modifying the predicted value, and building a cable transmission performance regression model based on the cable working data predicted value.
Description
Technical Field
The invention relates to the technical field of cable transmission performance analysis methods, in particular to a cable transmission performance analysis method and device based on test data.
Background
The cable is an important component widely used in modern industry, and carries key tasks such as power and data transmission, and various internal and external reasons can lead to the change of the transmission performance of the cable along with the working time of the cable, for example, the environment temperature and humidity can influence the cable transmission frequency corresponding to the ith voltage value in the calibration voltage, the internal and external noise can cause interference on the transmission signal of the cable, the power supply voltage can influence the bandwidth of the cable, the delay can also be changed while the transmission frequency is changed, and the data are closely related to the transmission performance of the cable.
In the prior art, all measured data are classified into electrical parameter data and environmental parameter data by considering factors influencing the transmission performance of the cable in multiple aspects, the data are analyzed and compared, a model or matrix is constructed to calculate the transmission performance constant of the cable, the sampled data are very comprehensive, the calculated transmission performance is accurate, or the transmission performance is improved by increasing the load, so that the efficiency is very high.
For example, publication No.: the cable transmission performance analysis method, the device and the electronic equipment based on the test data disclosed by CN116094548A comprise the steps of obtaining the test data of the cable, classifying the test data of the cable, generating a parameter comparison analysis group, constructing a performance matrix and comparing the impedance and the signal loss of the cable to obtain the performance analysis result of the cable. The method has the advantages that the tested parameter items are more, the sampled data range is also large, and the transmission performance analysis is more comprehensive.
For example, publication No.: the transmission performance improving system and method for the power distribution network cable line disclosed by CN107565546A comprise the steps of measuring a first temperature value of each position, measuring a second temperature value of each environment position, calculating a conductor temperature value of a conductor section, and calculating the current maximum load safety redundancy amount of a cable. The method is used for calculating redundancy through the difference between the inner temperature and the outer temperature of the conductor and calculating the load again, so that the transmission performance of the cable can be improved efficiently.
However, in the process of implementing the technical scheme of the invention in the embodiment of the application, the inventor of the application finds that at least the following technical problems exist in the above technology:
in the prior art, the influence factors on the transmission performance of the cable are not fully considered, the analysis result of the transmission performance of the cable is single by calculating the impedance and the signal loss, the calculation process is very complex when the sampling range is too large, the influence of some factors on the transmission performance of the cable is not negligible, and the prior art scheme also does not establish a model capable of predicting the transmission performance of the cable, so that the working state of the cable cannot be known in advance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cable transmission performance analysis method and device based on test data, which can effectively solve the problems related to the background art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a cable transmission performance analysis method based on test data comprises the following steps: calculating a cable working data predicted value, wherein the working data predicted value comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value; measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise the actual values of bandwidth, delay, throughput and packet loss, and verifying and modifying the calculation process of the predicted values of the working data; and constructing a cable transmission performance regression model based on the cable working data predicted value.
Furthermore, the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for to be stable in working state;
the voltage control device is preset, the voltage value is equally divided into n values in the cable calibration voltage range, each value is numbered as 1,2, & gt. Sequentially changing the power supply voltage of the cable in the working process according to the sequence of the serial numbers from small to large, waiting for the stable working state of the cable after each change of the voltage value, and measuring the transmission frequency, signal interference and cable length in the stable working state of the cable;
and calculating a cable bandwidth predicted value based on the measured transmission frequency, signal interference and cable length, wherein the calculation formula is as follows:
；
representing a predicted value of cable bandwidth at a specific voltage, < >>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>The signal interference of the cable corresponding to the ith voltage value in the calibration voltage is represented, L represents the length of the cable, U represents the current voltage value, +.>Representing the correlation coefficient of the bandwidth, n representing the number of voltage values.
Furthermore, the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for to be stable in working state;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values in a cable calibration transmission frequency range, numbering each value to be 1,2, & gt, i &.& gt, n, sequentially changing the transmission frequency of a cable in operation in the order of small numbers, waiting for the cable to be stable in operation state after each change of the value of the transmission frequency, measuring the cable length in the cable stable operation state, and carrying out subcarrier;
and calculating a cable delay predicted value based on the measured cable length and the subcarriers, wherein the calculation formula is as follows:
；
representing a predicted value of cable delay,/-, for>Indicating cable length->Representing the subcarrier of the cable corresponding to the ith frequency value in the nominal transmission frequency range, +.>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>Represents the delay correlation coefficient, and n represents the data amount of the transmission frequency value.
Further, firstly measuring the sectional area of a designated cable, then connecting the designated cable to a power supply matched with the cable, ensuring that the power supply outputs well, controlling the voltage, the current and the frequency within the calibrated range of the cable, and waiting for the stable working state of the cable without interference equipment around;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i, n, sequentially changing the transmission frequency of the cable in working according to the order of the numbers from small to large, waiting for the cable to be stable in working state after each change of the value of the transmission frequency, and measuring signal interference and transmission distance of the cable in the stable working state;
and calculating a cable throughput predicted value based on the measured signal interference and the sectional area of the cable, wherein the calculation formula is as follows:
；
representing a cable throughput prediction value,/->Ith in nominal voltageThe cable transmission frequency corresponding to the voltage value,indicating the cross-sectional area of the cable +.>Signal interference of cable corresponding to ith voltage value in nominal voltage>A correlation coefficient indicating throughput, and n indicates the data amount of the transmission frequency value.
Furthermore, the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for to be stable in working state;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i.
Calculating a predicted value of the cable packet loss rate based on the initial time, the end time and the packet loss number obtained by measurement, wherein the calculation formula is as follows:
；
representing a predicted value of the packet loss rate of the cable, +.>Representing a predicted transmission rate value corresponding to an ith frequency value within a nominal transmission frequency range, < >>Indicates the end time->Indicates the start time, ++>Indicating the packet loss number corresponding to the ith frequency value in the calibrated transmission frequency range,/for>The packet loss rate correlation coefficient is represented, and n represents the data amount of the transmission frequency value.
Further, the operating state is waited for to stabilize after each change of voltage or transmission frequency, and then the operating data of the cable is measured by a network analyzer: the real value of bandwidth, the real value of delay and the real value of packet loss rate are recorded, and the number difference between the real value of bandwidth and the predicted value of bandwidth is calculated each timeDifference between true delay value and predicted delay value +.>Difference between true value of packet loss rate and predicted value of packet loss rate>；
If it isIf the size of the packet loss ratio is within the allowable error range, the calculation process of adjusting the bandwidth predicted value, the delay predicted value and the packet loss ratio predicted value is not needed, if +.>、/>And->If the magnitude of (2) is not within the allowable error range, adjusting the bandwidth related coefficient +_in the calculation formula>Delay correlation coefficient->And packet loss rate correlation coefficient->Make all that、/>、/>The size of (2) is controlled within the allowable range, and +.>、/>And->Is a value of (2).
Further, after each change of the transmission frequency, waiting for the stable working state, measuring the actual value of the cable throughput by using a network analyzer, recording the actual value of the throughput, and obtaining the deviation coefficient of the cable throughput by calculation, wherein the calculation formula is as follows:
；
deviation coefficient representing cable throughput, +.>Representing the true value of the cable throughput, +.>Representing a cable throughput prediction value,/->Representing the maximum error value allowed by the cable throughput, if +.>The calculation of the cable forecast does not need to be adjusted if +.>If the value of (2) is greater than 1, adjusting the throughput correlation coefficient in the calculation formula>All the sizes are controlled to be within the range of less than 1, the final value is +.>N represents the data amount of the transmission frequency value.
Further, the transmission performance of the cable is determined by the bandwidth, delay, throughput and packet loss rate of the cable, the obtained working data predicted value is analyzed, the weight ratio of the bandwidth, delay, throughput and packet loss rate is determined, a regression model of the cable transmission performance index is built according to the weight ratio, and the model formula is as follows:
；
indicating cable transmission performance index->Representing a cable bandwidth forecast,/-, for>Weights representing cable bandwidthWeight ratio (weight ratio)>Representing a predicted value of cable delay,/-, for>Weight ratio representing cable delay, +.>Representing a cable throughput prediction value,/->Weight ratio representing cable throughput, +.>Representing a predicted value of the packet loss rate of the cable, +.>Weight ratio representing cable packet loss rate, +.>The transmission performance index exchange coefficient is represented, and n represents the data amount of the transmission frequency value.
Further, when the cable is in a complex working environment, the transmission performance of the cable is affected to a certain extent, the working data of the cable are required to be changed to improve the transmission performance of the cable, the working data required to be adjusted are analyzed according to a transmission performance index regression model, the bandwidth of the cable is changed by adjusting the power supply voltage according to the weight ratio, the delay of the cable is changed by adjusting the transmission frequency, the packet loss rate of the cable is changed by adjusting surrounding interference equipment, and the transmission performance index of the cable is observed until the requirements are met.
An apparatus for cable transmission performance analysis based on test data, comprising:
the predicted value calculation module is used for calculating a predicted value of the cable working data, wherein the predicted value of the working data comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value;
the verification and modification predicted value module is used for measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise a bandwidth actual value, a delay actual value, a throughput actual value and a packet loss rate actual value, and the verification and modification of the calculation process of the predicted values of the working data are carried out;
the regression model building module is used for building a cable transmission performance regression model based on the cable working data predicted value.
The invention has the following beneficial effects:
(1) The cable transmission performance analysis method based on the test data can extract main factors of cable transmission performance including bandwidth, delay, throughput and packet loss rate of the cable, change predicted values of voltage and transmission frequency in equal proportion, calculate predicted values of four factors, and perform transmission performance index modeling by using the predicted values, wherein the model plays a role in predicting performance indexes, and has more accuracy and rapid predictability compared with the traditional method based on experience theory or statistics;
(2) Setting weights for bandwidth, delay, throughput and packet loss rate while modeling, and adjusting the working data of the cable according to the weight ratio in a targeted manner when the predicted transmission performance index does not meet the requirement, and reducing the value of the surrounding interference equipment for adjusting the working data by changing the voltage affecting the working data of the cable and the transmission frequency;
of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a general flow chart of a cable transmission performance analysis method based on test data according to the present invention;
FIG. 2 is a detailed flow chart of a process for calculating and verifying a cable bandwidth forecast value in the cable transmission performance analysis method based on test data according to the present invention;
FIG. 3 is a detailed flowchart of a process for calculating and verifying a predicted value of a cable delay in a cable transmission performance analysis method based on test data according to the present invention;
FIG. 4 is a detailed flow chart of a process for calculating and verifying a cable throughput prediction value in the cable transmission performance analysis method based on test data according to the present invention;
fig. 5 is a detailed flowchart of a process for calculating and verifying a predicted value of a cable packet loss rate in the analysis method of cable transmission performance based on test data according to the present invention.
Detailed Description
According to the embodiment of the application, the signal generator, the spectrum analyzer, the time domain reflectometer, the crosstalk tester, the delay tester and the packet analyzer are used for testing working data in a stable state period of a cable under a certain environment, the testing data are compared with the predicted data, a difference value or a deviation coefficient of the two data is analyzed, a calculation process of the predicted value is adjusted within an allowable error range, and a transmission performance index of the cable is calculated by using the predicted value, so that the method for testing the transmission performance of the cable is realized.
The problems in the embodiments of the present application are as follows:
determining a test target: measuring bandwidth, delay, throughput and packet loss rate, and determining a required test method and tool according to a test target;
selecting a suitable test tool: the network analyzer, the packet analyzer and the delay tester ensure that the selected tool has the function of measuring the required parameters so as to perform comprehensive test;
preparing a test environment: ensuring that the test environment meets the test requirements, including equipment connected with cables, configuration and stability of network connection;
and constructing a transmission performance model, and predicting the transmission performance by using the model.
Referring to fig. 1, the embodiment of the invention provides a technical scheme: a cable transmission performance analysis method based on test data comprises the following steps:
calculating a cable working data predicted value, wherein the working data predicted value comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value;
measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise the actual values of bandwidth, delay, throughput and packet loss, and verifying and modifying the calculation process of the predicted values of the working data;
and constructing a cable transmission performance regression model based on the cable working data predicted value.
Specifically, the bandwidth predicted value of the cable is calculated, and the specific process is as follows: the voltage control device is preset, the voltage value is equally divided into n values which are equal to the equal fractional quantity of the voltage value in the cable calibration voltage range, each value is numbered as 1,2, & gt. Sequentially changing the power supply voltage of the cable in the working process according to the sequence of the serial numbers from small to large, waiting for the stable working state of the cable after each change of the voltage value, and measuring the transmission frequency, signal interference and cable length in the stable working state of the cable;
and calculating a cable bandwidth predicted value based on the measured transmission frequency, signal interference and cable length, wherein the calculation formula is as follows:
；
representing a predicted value of cable bandwidth at a specific voltage, < >>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>The signal interference of the cable corresponding to the ith voltage value in the calibration voltage is represented, L represents the length of the cable, U represents the current voltage value, +.>Representing the correlation coefficient of the bandwidth, n representing the number of voltage values.
In the embodiment, the appointed cable is connected to the power supply adapted to the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is tested after the working state of the cable is stable.
Specifically, a delay predicted value of the cable is calculated, and the specific process is as follows: the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i, n, sequentially changing the transmission frequency of the cable in working according to the sequence of the numbers from small to large, waiting for the cable to be stable in working state after each change of the value of the transmission frequency, and measuring the cable length and subcarriers in the cable stable working state;
and calculating a cable delay predicted value based on the measured cable length and the subcarriers, wherein the calculation formula is as follows:
；
representing a predicted value of cable delay,/-, for>Indicating cable length->Representing the subcarrier of the cable corresponding to the ith frequency value in the nominal transmission frequency range, +.>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>Represents the delay correlation coefficient, and n represents the data amount of the transmission frequency value.
In the embodiment, the appointed cable is connected to the power supply adapted to the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is tested after the working state of the cable is stable.
Specifically, the predicted throughput value of the cable is calculated, and the specific process is as follows: the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i, n, sequentially changing the transmission frequency of the cable in working according to the order of the numbers from small to large, waiting for the cable to be stable in working state after each change of the value of the transmission frequency, and measuring signal interference and transmission distance of the cable in the stable working state;
and calculating a cable throughput predicted value based on the measured signal interference and the sectional area of the cable, wherein the calculation formula is as follows:
；
representing a cable throughput prediction value,/->Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>Indicating the cross-sectional area of the cable +.>Signal interference of cable corresponding to ith voltage value in nominal voltage>A correlation coefficient indicating throughput, and n indicates the data amount of the transmission frequency value.
In the embodiment, the appointed cable is connected to the power supply adapted to the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is tested after the working state of the cable is stable.
Specifically, a predicted value of the packet loss rate of the cable is calculated, and the specific process is as follows: the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i.
Calculating a predicted value of the cable packet loss rate based on the initial time, the end time and the packet loss number obtained by measurement, wherein the calculation formula is as follows:
；
representing a predicted value of the packet loss rate of the cable, +.>Representing a predicted transmission rate value corresponding to an ith frequency value within a nominal transmission frequency range, < >>Indicates the end time->Indicates the start time, ++>Indicating the packet loss number corresponding to the ith frequency value in the calibrated transmission frequency range,/for>The packet loss rate correlation coefficient is represented, and n represents the data amount of the transmission frequency value.
In the embodiment, the appointed cable is connected to the power supply adapted to the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is tested after the working state of the cable is stable.
Specifically, measuring a cable bandwidth actual value, a delay actual value and a packet loss rate actual value, and verifying and modifying a bandwidth predicted value, a delay predicted value and a packet loss rate predicted value calculation process of the cable by using the actual values, wherein the specific process is as follows: after each change of voltage or transmission frequency, waiting for the working state to stabilize, and then measuring the working data of the cable by using a network analyzer: the real value of bandwidth, the real value of delay and the real value of packet loss rate are recorded, and the number difference between the real value of bandwidth and the predicted value of bandwidth is calculated each timeDifference between true delay value and predicted delay value +.>Difference between true value of packet loss rate and predicted value of packet loss rate>；
If it isIf the size of the packet loss ratio is within the allowable error range, the calculation process of adjusting the bandwidth predicted value, the delay predicted value and the packet loss ratio predicted value is not needed, if +.>、/>And->If the magnitude of (2) is not within the allowable error range, adjusting the bandwidth related coefficient +_in the calculation formula>Delay correlation coefficient->And packet loss rate correlation coefficient->Make all that、/>、/>The size of (2) is controlled within the allowable range, and +.>、/>And->Is a value of (2).
In this embodiment, the bandwidth correlation coefficient, the delay correlation coefficient and the packet loss rate correlation coefficient may be adjusted at any time according to the actual value of the working data, and the ranges of the allowable errors of the bandwidth, the delay and the packet loss rate are different.
Specifically, the actual value of the cable throughput is measured, the deviation coefficient of the cable throughput is calculated, and the calculation process of the throughput predicted value is adjusted according to the deviation coefficient, wherein the specific process is as follows: after each change of the transmission frequency, waiting for the stable working state, measuring the actual value of the cable throughput by using a network analyzer, recording the actual value of the throughput, and obtaining the deviation coefficient of the cable throughput by calculation, wherein the calculation formula is as follows:
；
deviation coefficient representing cable throughput, +.>Representing the true value of the cable throughput, +.>Representing a cable throughput prediction value,/->Representing the maximum error value allowed by the cable throughput, if +.>The calculation of the cable forecast does not need to be adjusted if +.>If the value of (2) is greater than 1, adjusting the throughput correlation coefficient in the calculation formula>All the sizes are controlled to be within the range of less than 1, the final value is +.>N represents the data amount of the transmission frequency value.
In this embodiment, the methods for verifying the predicted value of the cable throughput and verifying other predicted values are different, and the verification of the predicted value of the throughput uses a deviation coefficient, so that the value of the denominator in the calculation formula of the deviation coefficient of the cable throughput is never zero, thereby ensuring the correctness of the calculation formula, and the deviation coefficient represents the deviation degree of the predicted value and the true value.
Specifically, a cable transmission performance regression model is built based on a cable working data predicted value, and the specific process is as follows: the transmission performance of the cable is determined by the bandwidth, delay, throughput and packet loss rate of the cable, the obtained working data predicted value is analyzed, the weight ratio of the bandwidth, delay, throughput and packet loss rate is determined, a regression model of the transmission performance index of the cable is built according to the weight ratio, and the model formula is as follows:
；
indicating cable transmission performance index->Representing a cable bandwidth forecast,/-, for>Weight ratio representing cable bandwidth, +.>Representing a predicted value of cable delay,/-, for>Weight ratio representing cable delay, +.>Representing a cable throughput prediction value,/->Weight ratio representing cable throughput, +.>Representing a predicted value of the packet loss rate of the cable, +.>Weight ratio representing cable packet loss rate, +.>Representing transmission performance index exchange coefficients.
In this embodiment, the parameter factors that have the greatest influence on the transmission performance of the cable are bandwidth, delay, throughput and packet loss rate of the cable, weight ratios are set for four working data respectively, the transmission performance of the cable can be changed correspondingly under different environments, and the transmission performance of the cable can be corrected by adjusting the working data of the cable according to the weight ratios.
Specifically, the transmission state of the cable is analyzed according to the transmission performance regression model, and the working data of the cable is correspondingly adjusted based on weight ratio, and the specific process is as follows: when the cable is in a complex working environment, the transmission performance of the cable can be affected to a certain extent, the working data of the cable needs to be changed, the working data needing to be adjusted is analyzed according to a transmission performance index regression model, the bandwidth of the cable is changed by adjusting the power supply voltage according to the weight ratio, the delay of the cable is changed by adjusting the transmission frequency, the packet loss rate of the cable is changed by adjusting surrounding interference equipment, the transmission performance index of the cable is observed until the cable meets the requirement, the amplitude of a signal can be enhanced by increasing the power supply voltage, the broadband of the signal is further increased, the strength of the signal can be increased, the transmission rate of the signal is improved, the ratio of the signal to noise is improved, the adjustment of the bandwidth of the cable is realized by gradually adjusting the power supply voltage, the delay of the cable is changed by adjusting the transmission frequency, the transmission performance index of the cable is changed by adjusting the surrounding interference equipment in the process of adjusting the power supply voltage and the interference equipment, and the transmission performance index of the cable is observed in real time until the transmission performance index of the cable meets the set requirement.
In this embodiment, the methods of changing the cable bandwidth, delay, throughput and packet loss rate are different, the bandwidth of the cable needs to be changed by adjusting the power supply voltage, the delay and throughput of the cable need to be changed by changing the cable transmission frequency corresponding to the ith voltage value in the calibration voltage, and the packet loss rate of the cable can be changed by adjusting the transmission frequency or setting the anti-interference system.
An apparatus for cable transmission performance analysis based on test data, comprising:
the predicted value calculation module is used for calculating a predicted value of the cable working data, wherein the predicted value of the working data comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value;
the verification and modification predicted value module is used for measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise a bandwidth actual value, a delay actual value, a throughput actual value and a packet loss rate actual value, and the verification and modification of the calculation process of the predicted values of the working data are carried out;
the regression model building module is used for building a cable transmission performance regression model based on the cable working data predicted value.
In summary, the present application has at least the following effects:
the bandwidth predicted value, the delay predicted value, the throughput predicted value, the packet loss rate predicted value and the measured bandwidth actual value, the delay actual value, the throughput actual value and the packet loss rate actual value difference value are within the allowable range of the system, the predicted value is utilized to calculate the transmission performance index of the cable, the transmission performance index can predict the transmission performance of the cable which is about to be achieved in the last period, and if the transmission performance does not meet the requirement, the transmission performance can be adjusted according to the weight value.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of systems, apparatuses (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The cable transmission performance analysis method based on the test data is characterized by comprising the following steps of:
calculating a cable working data predicted value, wherein the working data predicted value comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value;
measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise the actual values of bandwidth, delay, throughput and packet loss, and verifying and modifying the calculation process of the predicted values of the working data;
building a cable transmission performance regression model based on a cable working data predicted value, wherein the specific process is as follows:
the transmission performance of the cable is determined by the bandwidth, delay, throughput and packet loss rate of the cable, the obtained working data predicted value is analyzed, the weight ratio of the bandwidth, delay, throughput and packet loss rate is determined, a regression model of the transmission performance index of the cable is built according to the weight ratio, and the model formula is as follows:
,
indicating cable transmission performance index->Representing a cable bandwidth forecast,/-, for>The weight ratio representing the bandwidth of the cable,representing a predicted value of cable delay,/-, for>Weight ratio representing cable delay, +.>Representing a cable throughput prediction value,/->Weight ratio representing cable throughput, +.>Representing a predicted value of the packet loss rate of the cable, +.>Weight ratio representing cable packet loss rate, +.>A transmission performance index exchange coefficient is represented, and n represents the data amount of the transmission frequency value;
the bandwidth predicted value of the cable is calculated, and the specific process is as follows:
the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for stable working state;
the voltage control device is preset, the voltage value is equally divided into n values in the cable calibration voltage range, each value is numbered as 1,2, & gt. Sequentially changing the power supply voltage of the cable in the working process according to the sequence of the serial numbers from small to large, waiting for the stable working state of the cable after each change of the voltage value, and measuring the transmission frequency, signal interference and cable length in the stable working state of the cable;
and calculating a cable bandwidth predicted value based on the measured transmission frequency, signal interference and cable length, wherein the calculation formula is as follows:
；
representing a predicted value of cable bandwidth at a specific voltage, < >>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>Signal interference of cable corresponding to ith voltage value in calibration voltage, L represents length of cable, U represents current voltage value, ++>Representing bandwidthN represents the number of voltage values.
2. The method for analyzing transmission performance of a cable based on test data according to claim 1, wherein the delay prediction value of the cable is calculated as follows:
the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for stable working state;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i, n, sequentially changing the transmission frequency of the cable in working according to the sequence of the numbers from small to large, waiting for the cable to be stable in working state after each change of the value of the transmission frequency, and measuring the cable length and subcarriers in the cable stable working state;
and calculating a cable delay predicted value based on the measured cable length and the subcarriers, wherein the calculation formula is as follows:
；
representing a predicted value of cable delay,/-, for>Indicating cable length->Representing the subcarrier of the cable corresponding to the ith frequency value in the nominal transmission frequency range, +.>Representing the ith voltage value pair in the calibration voltageThe corresponding cable transmission frequency, < >>Represents the delay correlation coefficient, and n represents the data amount of the transmission frequency value.
3. The method for analyzing transmission performance of a cable based on test data according to claim 2, wherein the calculation of the throughput prediction value of the cable comprises the following steps:
firstly, measuring the sectional area of a designated cable, then connecting the designated cable to a power supply matched with the cable, ensuring that the power supply outputs well, controlling the voltage, the current and the frequency within the calibrated range of the cable, and waiting for the stable working state of the cable without interference equipment around;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i, n, sequentially changing the transmission frequency of the cable in working according to the order of the numbers from small to large, waiting for the cable to be stable in working state after each change of the value of the transmission frequency, and measuring signal interference and transmission distance of the cable in the stable working state;
and calculating a cable throughput predicted value based on the measured signal interference and the sectional area of the cable, wherein the calculation formula is as follows:
；
representing a cable throughput prediction value,/->Represents the cable transmission frequency corresponding to the ith voltage value in the calibration voltage,indicating the cross-sectional area of the cable +.>Signal interference of cable corresponding to ith voltage value in nominal voltage>A correlation coefficient indicating throughput, and n indicates the data amount of the transmission frequency value.
4. The method for analyzing cable transmission performance based on test data according to claim 3, wherein the method for calculating the predicted value of the packet loss rate of the cable comprises the following specific steps:
the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for stable working state;
the method comprises the steps of presetting a transmission frequency control device, equally dividing a transmission frequency value into n values which are equal to the equal fractional quantity of a voltage value in a cable calibration voltage range in a cable calibration transmission frequency range, numbering each value to be 1,2, i.
Calculating a predicted value of the cable packet loss rate based on the initial time, the end time and the packet loss number obtained by measurement, wherein the calculation formula is as follows:
；
representing a predicted value of the packet loss rate of the cable, +.>Representing a predicted transmission rate value corresponding to an ith frequency value within a nominal transmission frequency range, < >>Indicates the end time->Indicates the start time, ++>Indicating the packet loss number corresponding to the ith frequency value in the calibrated transmission frequency range,/for>The packet loss rate correlation coefficient is represented, and n represents the data amount of the transmission frequency value.
5. The method for analyzing transmission performance of a cable based on test data according to claim 4, wherein the actual values of bandwidth, delay and packet loss are measured, and the actual values are used to verify and modify the calculation process of the predicted values of bandwidth, delay and packet loss, and the specific process is as follows:
after each change of voltage or transmission frequency, waiting for the working state to stabilize, and then measuring the working data of the cable by using a network analyzer: the real value of bandwidth, the real value of delay and the real value of packet loss rate are recorded, and the number difference between the real value of bandwidth and the predicted value of bandwidth is calculated each timeDifference between true delay value and predicted delay value +.>Difference between true value of packet loss rate and predicted value of packet loss rate>；
If it isIf the size of the packet loss ratio is within the allowable error range, the calculation process of adjusting the bandwidth predicted value, the delay predicted value and the packet loss ratio predicted value is not needed, if +.>、/>And->If the magnitude of (2) is not within the allowable error range, adjusting the bandwidth related coefficient +_in the calculation formula>Delay correlation coefficient->And packet loss rate correlation coefficient->Make all->、、/>The size of (2) is controlled within the allowable range, and +.>、/>And->Is a value of (2).
6. The method for analyzing cable transmission performance based on test data according to claim 5, wherein the actual cable throughput value is measured, the deviation coefficient of cable throughput is calculated, and the calculation process of the throughput prediction value is adjusted according to the deviation coefficient, which comprises the following specific steps:
after each change of the transmission frequency, waiting for the stable working state, measuring the actual value of the cable throughput by using a network analyzer, recording the actual value of the throughput, and obtaining the deviation coefficient of the cable throughput by calculation, wherein the calculation formula is as follows:
；
deviation coefficient representing cable throughput, +.>Representing the true value of the cable throughput, +.>Representing a cable throughput prediction value,/->Representing the maximum error value allowed by the cable throughput, if +.>The calculation of the cable forecast does not need to be adjusted if +.>If the value of (2) is greater than 1, adjusting the throughput correlation coefficient in the calculation formula>All the sizes are controlled to be within the range of less than 1, the final value is +.>。
7. The method for analyzing transmission performance of a cable based on test data according to claim 6, wherein the transmission state of the cable is analyzed according to a transmission performance regression model, and the working data of the cable is correspondingly adjusted based on weight comparison, and the specific process is as follows:
when the cable is in a complex working environment, the transmission performance of the cable can be affected to a certain extent, the working data of the cable needs to be changed, the working data needing to be adjusted is analyzed according to a transmission performance index regression model, the bandwidth of the cable is changed by adjusting the power supply voltage according to the weight ratio, the delay of the cable is changed by adjusting the transmission frequency, the packet loss rate of the cable is changed by adjusting surrounding interference equipment, the transmission performance index of the cable is observed until the cable meets the requirement, the amplitude of a signal can be enhanced by increasing the power supply voltage, the broadband of the signal is further increased, the strength of the signal can be increased, the transmission rate of the signal is improved, the ratio of the signal to noise is improved, the adjustment of the bandwidth of the cable is realized by gradually adjusting the power supply voltage, the delay of the cable is changed by adjusting the transmission frequency, the transmission performance index of the cable is changed by adjusting the surrounding interference equipment in the process of adjusting the power supply voltage and the interference equipment, and the transmission performance index of the cable is observed in real time until the transmission performance index of the cable meets the set requirement.
8. A test data-based cable transmission performance analysis device for the test data-based cable transmission performance analysis method of claim 1, comprising a predictive value calculation module, a verification and modification predictive value module, and a regression model module, wherein:
the predicted value calculation module is used for calculating a predicted value of the cable working data, wherein the predicted value of the working data comprises a bandwidth predicted value, a delay predicted value, a throughput predicted value and a packet loss rate predicted value;
the verification and modification predicted value module is used for measuring the actual values of the working data of the cable, wherein the actual values of the working data comprise a bandwidth actual value, a delay actual value, a throughput actual value and a packet loss rate actual value, and the verification and modification of the calculation process of the predicted values of the working data are carried out;
the regression model building module is used for building a cable transmission performance regression model based on the cable working data predicted value, and the specific process is as follows:
the transmission performance of the cable is determined by the bandwidth, delay, throughput and packet loss rate of the cable, the obtained working data predicted value is analyzed, the weight ratio of the bandwidth, delay, throughput and packet loss rate is determined, a regression model of the transmission performance index of the cable is built according to the weight ratio, and the model formula is as follows:wherein->Indicating cable transmission performance index->Representing a cable bandwidth forecast,/-, for>The weight ratio representing the bandwidth of the cable,representing a predicted value of cable delay,/-, for>Weight ratio representing cable delay, +.>Representing a cable throughput prediction value,/->Weight ratio representing cable throughput, +.>Representing a predicted value of the packet loss rate of the cable, +.>Weight ratio representing cable packet loss rate, +.>A transmission performance index exchange coefficient is represented, and n represents the data amount of the transmission frequency value;
the bandwidth predicted value of the cable is calculated, and the specific process is as follows:
the appointed cable is connected to a power supply matched with the cable, so that good power supply output is ensured, the voltage, the current and the frequency are controlled within the calibrated range of the cable, surrounding interference-free equipment is avoided, and the cable is waited for stable working state;
the voltage control device is preset, the voltage value is equally divided into n values in the cable calibration voltage range, each value is numbered as 1,2, & gt. Sequentially changing the power supply voltage of the cable in the working process according to the sequence of the serial numbers from small to large, waiting for the stable working state of the cable after each change of the voltage value, and measuring the transmission frequency, signal interference and cable length in the stable working state of the cable;
and calculating a cable bandwidth predicted value based on the measured transmission frequency, signal interference and cable length, wherein the calculation formula is as follows:
；
representing cable bandwidth predictions at a particular voltage，/>Indicating the cable transmission frequency corresponding to the ith voltage value in the nominal voltage, < >>Signal interference of cable corresponding to ith voltage value in calibration voltage, L represents length of cable, U represents current voltage value, ++>Representing the correlation coefficient of the bandwidth, n representing the number of voltage values.
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