A data processing method for testing avionics equipment

Abstract

The present invention relates to the field of data processing technology and proposes a data processing method for testing avionics equipment, comprising: testing the communication optical cable of an aircraft communication system using an optical time domain reflectometer; analyzing the deviation between the loss value of the optical signal reflection intensity at each moment and the reflection loss threshold to obtain the optical cable failure probability during the monitoring period; analyzing the difference between the time when the optical signal reaches the bending position of the optical cable and the time corresponding to the peak point to obtain the optical signal reflection unpredictability during the monitoring period; combining the difference in light source power to obtain the optical cable performance error during the monitoring period; combining the change in temperature data to obtain the additional loss degree of the optical cable during the monitoring period; determining the test result correction coefficient during the monitoring period; correcting the reflection signal waveform diagram, and testing the communication optical cable. The present invention aims to solve the problem that the transmission process of the optical signal of the communication optical cable is interfered with by subtle changes of multiple factors, which affects the actual performance judgment of the optical cable.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a data processing method for testing avionics equipment. Background Art

[0002] In avionics equipment, testing of communication optical cables is a key step in ensuring the high reliability and safety of aircraft communication systems. Through a systematic testing process and strict compliance verification, aircraft communication optical cables can still transmit data stably in harsh environments, ensuring flight safety. However, during the installation, maintenance and operation of optical cables, they may be affected by various factors, such as environmental conditions, mechanical damage and manufacturing defects, which may cause the performance of the optical cables to degrade or even cause optical cable failure, affecting the overall communication quality.

[0003] Current testing methods for communication optical cables include optical time domain reflectometry (OTDR) testing, optical power meter testing, and insertion loss testing. OTDR assesses optical fiber link loss and fault location by sending pulsed light signals and analyzing the intensity and timing of reflected light signals. While it can locate faults, its ability to detect minor losses or early-stage faults is limited, which can easily lead to hidden dangers not being discovered in a timely manner. Traditional optical cable testing methods are susceptible to a variety of interference factors, resulting in inaccurate and unreliable test results. Environmental changes (such as temperature and humidity), equipment errors, connector loss, and light source fluctuations can all cause measurement deviations in key parameters such as reflection loss and transmission loss. This makes it impossible to accurately reflect the actual condition of the optical cable during optical fiber performance evaluation and fault diagnosis, thereby affecting the effectiveness and accuracy of maintenance decisions. Summary of the Invention

[0004] The present invention provides a data processing method for testing avionics equipment to solve the problem that the optical signal propagation process of existing communication optical cables is interfered with by subtle changes of multiple factors, thus affecting the actual performance judgment of the optical cables. The technical solutions adopted are as follows:

[0005] The present invention provides a data processing method for testing avionics equipment, the method comprising the following steps:

[0006] The communication optical cable of the aircraft communication system is tested using an optical time domain reflectometer to obtain the reflected signal waveform during the monitoring period and record the optical signal incident intensity, light source power and optical cable surface temperature data at each moment during the monitoring period;

[0007] Analyze the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold, and combine the reflection intensity at each moment in the monitoring period to obtain the optical cable failure probability during the monitoring period; based on the optical cable failure probability, and analyzing the difference between the moment when the optical signal reaches the optical cable bend position and the moment corresponding to the peak point in the reflection signal waveform, obtain the optical signal reflection unpredictability during the monitoring period; combine the reflection intensity changes at adjacent moments in the reflection signal waveform and the difference in light source power to obtain the optical cable performance error during the monitoring period;

[0008] Based on the change in temperature data during the period of decreased reflection intensity in the reflected signal waveform, the additional loss of the optical cable during the monitoring period is obtained; combined with the optical cable performance error during the monitoring period, the test result correction coefficient of the monitoring period is determined;

[0009] The reflected signal waveform is corrected by the test result correction coefficient and compared with the original reflected signal waveform to test the communication optical cable.

[0010] Optionally, obtaining the optical cable failure probability during the monitoring period includes a specific method as follows:

[0011] Analyze the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold to obtain the reflection loss anomaly rate during the monitoring period;

[0012] A peak point detection algorithm is used to obtain several peak points in the reflection signal waveform during the monitoring period, and the product of the mean of the reflection intensity of all peak points and the standard deviation of the reflection intensity at all times during the monitoring period is used as the waveform irregularity during the monitoring period;

[0013] The product of the waveform irregularity and the reflection loss abnormality rate is used as the optical cable failure probability during the monitoring period.

[0014] Optionally, obtaining the reflection loss abnormality rate during the monitoring period includes the following specific methods:

[0015] Obtain the reflection intensity at each moment, and use the ratio of the reflection intensity to the incident intensity at any moment as the optical signal reflection loss value at that moment; use the ratio of the reflection loss threshold to the optical signal reflection loss value at that moment as the reflection loss factor at that moment; and use the average of the reflection loss factors at all moments in the monitoring period as the reflection loss anomaly rate for the monitoring period.

[0016] Optionally, obtaining the unexpectedness of the optical signal reflection during the monitoring period includes the following specific methods:

[0017] Obtaining the corresponding position in the optical cable at each moment in the reflection signal waveform; taking the coordinate point of each optical cable bending position at the corresponding time point in the reflection signal waveform as the optical cable bending point; taking the peak point and the optical cable bending point with the same order value as a set of reflection change point pairs, thereby obtaining a plurality of sets of reflection change point pairs;

[0018] Obtain the absolute value of the difference between the time corresponding to the peak point in any set of reflection change point pairs and the time corresponding to the optical cable bending point. Multiply the average of the absolute values ​​of the differences obtained from all sets of reflection change point pairs by the probability of optical cable failure during the monitoring period, and use it as the optical signal reflection unexpectedness during the monitoring period.

[0019] Optionally, obtaining the optical cable performance error during the monitoring period includes the following specific methods:

[0020] According to the change of reflection intensity at adjacent moments in the reflection signal waveform, the reflection change slope and several attenuation moments at each moment in the monitoring period are obtained;

[0021] The time period between any two adjacent peak points is regarded as a reflection fluctuation segment; the average value of the reflection change slopes at all attenuation moments in the reflection fluctuation segment is regarded as the attenuation strength of the optical signal in the reflection fluctuation segment;

[0022] Based on the optical signal attenuation strength and the difference in light source power at adjacent moments in the reflection fluctuation segment, the light source attenuation interference degree of each reflection fluctuation segment is obtained;

[0023] The average value of the light source attenuation interference degree of all reflection fluctuation segments within the monitoring period is taken as the light source interference degree of the monitoring period.

[0024] Optionally, the obtaining of the reflection change slope and the plurality of attenuation moments at each moment in the monitoring period includes the following specific methods:

[0025] Based on the reflection intensities at adjacent moments within the monitoring period, the reflection intensity at any moment is subtracted from the reflection intensity at the previous moment. The difference between the reflection intensity at any moment and the difference between the adjacent moments in the optical signal time domain meter is used as the reflection change slope at that moment.

[0026] The moments when the slope of the reflection change is negative during the monitoring period are recorded as attenuation moments.

[0027] Optionally, the obtaining of the light source attenuation interference degree of each reflection fluctuation segment includes the following specific methods:

[0028] Obtain the absolute value of the difference between the light source powers at any two adjacent moments in any reflection fluctuation segment, and take the average of the absolute values ​​of the difference between the light source powers at all adjacent moments in the reflection fluctuation segment and the product of the light signal attenuation intensity of the reflection fluctuation segment as the light source attenuation interference degree of the reflection fluctuation segment.

[0029] Optionally, obtaining the extra loss degree of the optical cable during the monitoring period includes a specific method as follows:

[0030] Based on the surface temperature data of the optical cable at each moment during the monitoring period, the temperature change slope at each moment is obtained;

[0031] Based on the difference between the temperature change slope and the reflection change slope at each attenuation moment in the monitoring period, the additional loss degree of the optical cable during the monitoring period is obtained. The difference between the temperature change slope and the reflection change slope at each attenuation moment is recorded as the temperature interference loss factor at each attenuation moment. The additional loss degree of the optical cable is positively correlated with the temperature interference loss factor.

[0032] Optionally, the test result correction coefficient of the monitoring period is obtained by:

[0033] The product of the optical cable performance error during the monitoring period and the degree of additional optical cable loss is normalized by inverse proportion to obtain the test result correction coefficient during the monitoring period.

[0034] Optionally, the correction of the reflected signal waveform using the test result correction coefficient includes the following specific methods:

[0035] In the test result analysis software in the OTDR system, enter the test result correction coefficient and multiply it with the original reflection signal waveform to obtain the corrected test result.

[0036] The beneficial effects of the present invention are as follows: the present invention uses an optical time domain reflectometer to perform an optical signal propagation test on a communication optical cable in an aircraft communication system, analyzes the irregular fluctuation characteristics of the reflected signal itself, and combines the interference of light source power changes and environmental changes to comprehensively quantify the interference of multiple factors on the change of the reflected signal; first, the loss value between the optical signal reflection intensity and the incident intensity and the reflection loss threshold are measured, combined with the high performance and violent fluctuation of the reflection intensity, to quantify the probability of optical cable failure, so as to preliminarily quantify the optical cable failure from the irregular abnormal performance of the reflection intensity, and further analyze the deviation between the reflection situation caused by bending equal cross-sections during the optical signal propagation process and the actual peak point, combined with the influence of light source power changes on the reflection attenuation of the optical signal, and comprehensively analyze the displacement deviation during the optical signal propagation process. The interference of the reflected signal caused by the difference in temperature is analyzed to obtain the optical cable performance error that can reflect the degree of interference of the optical cable by multiple factors; based on the deviation influence of the optical cable's own light source on the reflected signal, the additional loss of the optical signal reflection caused by environmental changes is further analyzed, and the influence of temperature increase on the attenuation of the reflected signal is quantified. The test result correction coefficient is obtained in combination with the optical cable performance error to ensure that the reflected signal waveform under the interference of multiple factors can be corrected to a greater extent; by correcting the deviation caused by the interference to ensure the validity of the test result, the status of the optical cable is comprehensively analyzed based on the original reflected signal waveform and the corrected test results to provide clearer and more accurate information on the status and performance of the optical cable, thereby realizing the test of avionics equipment based on the communication optical cable test of the aircraft communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic flow chart of a data processing method for testing avionics equipment provided by one embodiment of the present invention;

[0039] Figure 2 This is an example diagram of the reflected signal waveform;

[0040] Figure 3 This is an example diagram of light source power changes. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1 , which shows a flow chart of a data processing method for testing avionics equipment provided by one embodiment of the present invention, the method comprising the following steps:

[0043] Step S001: Test the communication optical cable of the aircraft communication system using an optical time domain reflectometer to obtain a reflection signal waveform during a monitoring period, and record the optical signal incident intensity, light source power, and optical cable surface temperature data at each moment during the monitoring period.

[0044] It should be noted that in aircraft communication systems, aviation communication optical cables work in harsh environments for a long time and are responsible for transmitting a large amount of data. The performance of the optical cables is particularly critical. The application of communication optical cable testing methods in aircraft communication systems can comprehensively evaluate long-distance optical cable links, identify transmission loss, reflection loss and fault points, and ensure the high reliability and security of data transmission and communication systems.

[0045] The purpose of this embodiment is to use a high-performance optical time domain reflectometer (OTDR) system to output a reflection signal waveform during communication optical cable testing. By analyzing the test waveform, it is possible to promptly detect signs of minor losses and early faults. By identifying and analyzing various fault conditions, the aircraft communication system can be troubleshooted and repaired, ensuring the normal operation of avionics equipment and the communication system as soon as possible. Therefore, it is necessary to first obtain the reflection signal waveform using the OTDR system and simultaneously record the incident optical signal intensity at each moment. Since fluctuations in light source power and changes in ambient temperature can also affect optical signal reflection, it is necessary to record the light source power and the temperature of the optical cable surface.

[0046] Specifically, a high-performance optical time domain reflectometer (OTDR) system is integrated into the network architecture of the aircraft's communication system. The system has automated monitoring and remote management capabilities and can seamlessly connect with the communication system's network management system (NMS). OTDR equipment is deployed at key nodes of the optical cable (such as optical junction boxes, distribution frames, etc.) to ensure coverage of the entire optical cable link. Through regular or real-time testing, link loss, reflection, and fault information can be obtained. The OTDR will automatically perform tests periodically or based on trigger conditions (such as abnormal changes) to collect real-time performance data of the optical cable, including optical loss, reflection loss, and fault location.

[0047] Furthermore, the OTDR device is started, and monitoring parameters such as test wavelength, pulse width, and test period are configured in the monitoring system of the aircraft communication system; the frequency of real-time monitoring is set according to the needs of the aircraft communication system, such as hourly, daily, etc., or the monitoring frequency is dynamically adjusted according to traffic changes. In this embodiment, monitoring is performed once an hour, and the duration of each test is half an hour. The duration of the monitoring period is half an hour, and the sampling time interval of the reflection intensity is set to 1 minute; after the test is completed, a reflection signal waveform is output, with the horizontal axis representing time and the vertical axis representing reflection intensity, as shown in FIG. Figure 2 As shown; the incident intensity of the light signal and the light source power are recorded at the same time, and the sampling time interval is the same as the reflection intensity. The light source power change curve is shown in Figure 3 As shown, the horizontal axis is time and the vertical axis is the light source power. A high-precision temperature sensor is also needed to obtain the temperature of the communication optical cable surface in real time (a digital temperature sensor with high precision and fast response speed can be selected, such as DS18B20, DHT22, etc.). The sampling time interval is also the same as the reflection intensity to obtain the optical cable surface temperature data at each moment.

[0048] Step S002: Analyze the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold, and combine the reflection intensity at each moment in the monitoring period to obtain the optical cable failure probability during the monitoring period; based on the optical cable failure probability, and analyze the difference between the moment when the optical signal reaches the bending position of the optical cable and the moment corresponding to the peak point in the reflection signal waveform, obtain the optical signal reflection unexpectedness during the monitoring period; combine the reflection intensity change at adjacent moments in the reflection signal waveform and the light source power difference to obtain the optical cable performance error during the monitoring period.

[0049] It should be noted that the reflected signal waveform shows the optical signal reflection intensity at each time point during the optical signal's propagation through the optical cable. The optical signal reflection loss value is quantified by performing a difference analysis between the optical signal reflection intensity and the incident intensity. Since the optical time domain reflectometer may receive more than one reflected signal, if the reflection loss value is lower than the reflection signal threshold, it may mean that there is a poor link or optical cable breakage, and the reflection loss anomaly rate is high. Combined with the fluctuation of the reflection intensity, the optical cable failure probability is comprehensively quantified.

[0050] Preferably, in one embodiment of the present invention, the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold is analyzed, and the optical cable failure probability during the monitoring period is obtained in combination with the reflection intensity at each moment during the monitoring period. The specific method includes:

[0051] In the reflection signal waveform diagram during the monitoring period, the reflection intensity at each moment is obtained, and the ratio of the reflection intensity to the incident intensity at any moment is used as the optical signal reflection loss value at that moment. During the test process, a reflection loss threshold is preset for the communication optical cable, and the ratio of the reflection loss threshold to the optical signal reflection loss value at that moment is used as the reflection loss factor at that moment. The average of the reflection loss factors at all moments in the monitoring period is used as the reflection loss anomaly rate of the monitoring period.

[0052] Furthermore, a peak point detection algorithm is used to obtain several peak points in the reflection signal waveform diagram of the monitoring period, and the product of the mean of the reflection intensity of all peak points and the standard deviation of the reflection intensity at all times in the monitoring period is used as the waveform irregularity of the monitoring period; the product of the waveform irregularity and the reflection loss anomaly rate is used as the optical cable failure probability of the monitoring period.

[0053] It should be noted that the larger the reflection loss factor at each moment in the monitoring period, the smaller the optical signal reflection loss value is than the reflection loss threshold, and the higher the reflection loss anomaly rate is; at the same time, the overall reflection intensity fluctuates greatly, and the peak point remains high. The optical fiber may be damaged by external forces, such as compression, stretching or excessive bending, causing the reflection signal waveform to be irregular and fluctuate greatly. The greater the waveform irregularity, the greater the probability of optical cable failure.

[0054] It should be further explained that the waveform of the optical time domain reflectometer shows the reflection intensity of the optical signal at various locations during the propagation process of the optical cable. The time points on the horizontal axis correspond to different locations in the optical cable. The actual conditions at different locations (such as compression and bending) will have different effects on the reflection of the optical signal, necessitating the evaluation of the optical cable performance during the test. The reflection peaks in the waveform represent the reflection of the optical signal when it encounters connectors, branches, or other cross-sections in the optical fiber. Each reflection peak usually corresponds to a connection point or interface in the optical fiber.

[0055] Preferably, in one embodiment of the present invention, based on the optical cable failure probability, and analyzing the difference between the time when the optical signal reaches the bending position of the optical cable and the time corresponding to the peak point in the reflected signal waveform, the unexpectedness of the optical signal reflection during the monitoring period is obtained, including the specific method of:

[0056] Since the speed of light in optical fiber is known, the OTDR converts time into distance. For example, the speed of light in optical fiber is approximately 2 / 3 the speed of light in a vacuum (approximately 200,000 kilometers per second). Therefore, the OTDR converts each moment in the reflection signal waveform to obtain the corresponding position in the optical cable at each moment. The coordinate point of each optical cable bend position at the corresponding time point in the reflection signal waveform is used as the optical cable bend point. At the same time, several peak points in the reflection signal waveform are obtained. The optical cable bend points and peak points are sorted in time sequence. The peak points and optical cable bend points with the same order value are regarded as a set of reflection change point pairs, resulting in several sets of reflection change point pairs, where the number of reflection change point pairs is the minimum value between the number of peak points and the number of optical cable bend points.

[0057] Furthermore, the absolute value of the difference between the corresponding time of the peak point in any set of reflection change point pairs and the corresponding time of the optical cable bending point is obtained, and the average of the absolute values ​​of the differences obtained from all sets of reflection change point pairs and the product of the probability of optical cable failure during the monitoring period are taken as the unexpectedness of the optical signal reflection during the monitoring period.

[0058] It should be noted that the greater the deviation between the peak point of the optical signal reflection intensity and the time point corresponding to the actual deformation position, the more likely it is that there is interference or false information in the reflection intensity peak. At the same time, the greater the probability of optical cable failure, the larger the reflected signal waveform may be and may not truly reflect the reflection of the optical signal, and the more unexpected the optical signal reflection is.

[0059] It should be further explained that in the actual test process, due to the power fluctuation or instability of the light source itself, the signal strength may change, resulting in reflection attenuation or a more prominent peak area in the waveform diagram. These phenomena will affect the test accuracy of the communication optical cable. It is necessary to analyze the change in reflection intensity between adjacent peak points. In the case of reflection intensity attenuation, the greater the difference in light source power at adjacent moments, the greater its impact on the reflection intensity attenuation. Based on the unexpected reflection of the optical signal, the optical cable performance error is quantified.

[0060] Preferably, in one embodiment of the present invention, the optical cable performance error during the monitoring period is obtained by combining the reflection intensity changes at adjacent moments in the reflection signal waveform and the light source power difference, including the specific method of:

[0061] Based on the reflection intensities at adjacent moments within the monitoring period, the difference between the reflection intensity at any moment and the reflection intensity at the immediately preceding moment is calculated, and the ratio of the difference between the adjacent moments in the optical signal time domain meter is used as the reflection change slope at that moment. It should be noted that the reflection change slope at the first moment is set to the reflection change slope at the second moment, since there is no immediately preceding moment for the first moment. Several moments in the monitoring period where the reflection change slope is negative are recorded as several attenuation moments.

[0062] Furthermore, the time period between the moments corresponding to any two adjacent peak points is taken as a reflection fluctuation segment; the average of the reflection change slopes at all attenuation moments in the reflection fluctuation segment is taken as the optical signal attenuation intensity of the reflection fluctuation segment; the absolute value of the difference between the light source powers at any two adjacent moments in the reflection fluctuation segment is obtained, and the average of the absolute values ​​of the difference between the light source powers at all adjacent moments in the reflection fluctuation segment and the product of the optical signal attenuation intensity are taken as the light source attenuation interference degree of the reflection fluctuation segment; the average of the light source attenuation interference degrees of all reflection fluctuation segments within the monitoring period is taken as the light source interference degree of the monitoring period.

[0063] It should be noted that the greater the optical signal attenuation, the greater the difference in light source power between adjacent moments, and the greater the impact of light source power changes on optical signal attenuation, the greater the light source interference; and the greater the unexpectedness of optical signal reflection, the greater the possibility that the optical signal reflection process will be interfered by changes in light source power, that is, it is more likely that changes in light source power will cause the deviation between the reflection intensity peak point and the optical cable bending position, thereby obtaining the optical cable performance error.

[0064] Furthermore, the product of the light source interference degree and the optical signal reflection unexpectedness during the monitoring period is taken as the optical cable performance error during the monitoring period.

[0065] At this point, the optical cable failure probability is first quantified by the deviation of the loss value between the optical signal reflection intensity and the incident intensity from the reflection loss threshold, combined with the high performance and violent fluctuation of the reflection intensity, so as to preliminarily quantify the optical cable failure from the irregular abnormal performance of the reflection intensity. Further, the deviation between the reflection caused by bending and other cross-sections during the propagation of the optical signal and the actual peak point is further analyzed. Combined with the impact of the change in light source power on the reflection attenuation of the optical signal, the interference of the reflected signal caused by the displacement deviation during the propagation of the optical signal is comprehensively analyzed, and the optical cable performance error that can reflect the degree of interference of the optical cable by multiple factors is obtained.

[0066] Step S003: Obtain the extra loss of the optical cable during the monitoring period based on the change in temperature data during the time period when the reflection intensity decreases in the reflection signal waveform; and determine the test result correction coefficient during the monitoring period in combination with the optical cable performance error during the monitoring period.

[0067] It should be noted that when using an optical time-domain reflectometer to test communication optical cables, any slight mismatch at the connection of the communication optical cable may cause changes in the reflection intensity. Environmental changes will also affect the propagation of optical signals and generate additional losses, which in turn lead to fluctuations in reflection intensity. Therefore, it is necessary to quantify the additional loss of reflection intensity at the attenuation moment through changes in environmental temperature data to quantify the additional loss of optical signal propagation caused by temperature changes.

[0068] Preferably, in one embodiment of the present invention, the additional loss degree of the optical cable during the monitoring period is obtained according to the change of the temperature data in the time period when the reflection intensity decreases in the reflection signal waveform, and the specific method includes:

[0069] The ratio of the difference between the optical cable surface temperature data at any moment in the monitoring period and the optical cable surface temperature data at the previous moment is used as the temperature change slope at that moment. In particular, the temperature change slope at the first moment is set as the temperature change slope at the second moment.

[0070] Furthermore, the absolute value of the difference between the temperature change slope and the reflection change slope at any attenuation moment in the monitoring period is obtained as the temperature interference loss factor at the attenuation moment; the average of the temperature interference loss factors of all attenuation moments in the monitoring period is taken as the additional loss degree of the optical cable in the monitoring period.

[0071] It should be noted that the reflection change slope at the attenuation moment is negative, and the temperature drops at the attenuation moment, which has little effect on the attenuation of the reflection intensity. If the temperature rises, the temperature change slope is positive, and the corresponding temperature interference consumption factor will be greater, that is, the temperature increase causes the reflection intensity of the optical signal to attenuate, and thus the additional loss of the optical cable will also be greater.

[0072] Preferably, in one embodiment of the present invention, the test result correction coefficient of the monitoring period is determined in combination with the optical cable performance error during the monitoring period, and the specific method includes:

[0073] The product of the optical cable performance error and the extra loss degree of the optical cable during the monitoring period is normalized by inverse proportion to obtain the test result correction coefficient of the monitoring period. Model to present inverse proportional relationship and normalization processing, represents an exponential function with a natural constant as the base, As the input of the model, the implementer can set the inverse proportional function and the normalization function in actual situations. In this embodiment, when the product is input into the model, the product is multiplied by the hyperparameter. The hyperparameter is described using 0.001 as an example. The purpose is to avoid the output test result correction coefficient being too small.

[0074] It should be noted that when the degree of additional loss of the optical cable and the error in the optical cable performance are both large, the reflected signal waveform may be affected by multiple factors and produce an inflated situation, requiring a greater degree of correction, that is, making the test result correction coefficient smaller, and then multiplying it with the reflected signal waveform to achieve a larger correction.

[0075] At this point, based on the deviation effect of the optical cable's own light source on the reflected signal, we further analyzed the additional loss of optical signal reflection caused by environmental changes, quantified the impact of temperature increase on the attenuation of the reflected signal, and combined with the optical cable performance error to obtain the test result correction factor to ensure that the reflected signal waveform under the interference of multiple factors can be corrected to a greater extent.

[0076] Step S004: Correct the reflected signal waveform using the test result correction coefficient, compare it with the original reflected signal waveform, and test the communication optical cable.

[0077] Specifically, in the test result analysis software in the OTDR system, the test result correction coefficient is input and multiplied by the original reflection signal waveform, that is, the reflection intensity at each moment is multiplied by the test result correction coefficient to obtain the corrected test result (corrected waveform); the test result analysis software performs waveform change analysis on the corrected test result to identify the loss and reflection characteristics during the propagation of the optical signal in the communication optical cable, and compares the corrected test result with the original reflection signal waveform to check whether the correction has eliminated the deviation caused by environmental factors and performance errors. This is the existing analysis and processing flow in the test result analysis software and will not be repeated in this embodiment.

[0078] Furthermore, the original reflection signal waveform, the correction coefficient of the test result, the corrected test result and the corrected analysis result are recorded in the test report. At the same time, after the test is completed, the OTDR will generate a detailed report on the optical cable performance, including parameters such as optical loss and reflection loss. The communication optical cable can be tested through the OTDR and correction analysis. If an abnormality or fault is detected, the system will automatically generate an alarm to notify the network management personnel of the communication optical cable.

[0079] At this point, optical signal propagation tests have been conducted on the communication optical cables in the aircraft communication system using an optical time domain reflectometer. The irregular fluctuation characteristics of the reflected signal itself have been analyzed. Combined with the interference of changes in light source power and environmental changes, the interference of multiple factors on the changes in the reflected signal is comprehensively quantified. The deviation caused by the interference is corrected to ensure the validity of the test results. The status of the optical cable is then comprehensively analyzed based on the original reflected signal waveform and the corrected test results to provide clearer and more accurate information on the cable status and performance.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A data processing method for testing avionics equipment, characterized in that: The method comprises the following steps: The communication optical cable of the aircraft communication system is tested using an optical time domain reflectometer to obtain the reflected signal waveform during the monitoring period and record the optical signal incident intensity, light source power and optical cable surface temperature data at each moment during the monitoring period; Analyze the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold, and combine it with the reflection intensity at each moment in the monitoring period to obtain the optical cable failure probability during the monitoring period; based on the optical cable failure probability, and analyzing the difference between the moment when the optical signal reaches the optical cable bend position and the moment corresponding to the peak point in the reflection signal waveform, obtain the optical signal reflection unpredictability during the monitoring period; based on the optical signal reflection unpredictability, combine the reflection intensity changes at adjacent moments in the reflection signal waveform and the difference in light source power to obtain the optical cable performance error during the monitoring period; Obtaining the excess loss of the optical cable during the monitoring period based on changes in temperature data during the time period when the reflection intensity decreases in the reflected signal waveform; determining a correction coefficient for the test results during the monitoring period based on the excess loss of the optical cable and the optical cable performance error during the monitoring period; The reflected signal waveform is corrected by the test result correction coefficient and compared with the original reflected signal waveform to test the communication optical cable.

2. The data processing method for testing avionics equipment according to claim 1, wherein: The specific method of obtaining the optical cable failure probability during the monitoring period includes: Analyze the deviation between the loss value between the optical signal reflection intensity and the incident intensity at each moment and the reflection loss threshold to obtain the reflection loss anomaly rate during the monitoring period; A peak point detection algorithm is used to obtain several peak points in the reflection signal waveform during the monitoring period, and the product of the mean of the reflection intensity of all peak points and the standard deviation of the reflection intensity at all times during the monitoring period is used as the waveform irregularity during the monitoring period; The product of the waveform irregularity and the reflection loss abnormality rate is used as the optical cable failure probability during the monitoring period.

3. The data processing method for testing avionics equipment according to claim 2, wherein: The specific method of obtaining the reflection loss abnormality rate during the monitoring period includes: Obtain the reflection intensity at each moment, and use the ratio of the reflection intensity to the incident intensity at any moment as the optical signal reflection loss value at that moment; use the ratio of the reflection loss threshold to the optical signal reflection loss value at that moment as the reflection loss factor at that moment; and use the average of the reflection loss factors at all moments in the monitoring period as the reflection loss anomaly rate for the monitoring period.

4. The data processing method for testing avionics equipment according to claim 2, wherein: The specific method of obtaining the unexpectedness of the optical signal reflection during the monitoring period includes: Obtaining the corresponding position in the optical cable at each moment in the reflection signal waveform; taking the coordinate point of each optical cable bending position at the corresponding time point in the reflection signal waveform as the optical cable bending point; taking the peak point and the optical cable bending point with the same order value as a set of reflection change point pairs, thereby obtaining a plurality of sets of reflection change point pairs; Obtain the absolute value of the difference between the time corresponding to the peak point in any set of reflection change point pairs and the time corresponding to the optical cable bending point. Multiply the average of the absolute values ​​of the differences obtained from all sets of reflection change point pairs by the probability of optical cable failure during the monitoring period, and use it as the optical signal reflection unexpectedness during the monitoring period.

5. The data processing method for testing avionics equipment according to claim 1, wherein: The specific method of obtaining the optical cable performance error during the monitoring period includes: According to the change of reflection intensity at adjacent moments in the reflection signal waveform, the reflection change slope and several attenuation moments at each moment in the monitoring period are obtained; The time period between any two adjacent peak points is regarded as a reflection fluctuation segment; the average value of the reflection change slopes at all attenuation moments in the reflection fluctuation segment is regarded as the attenuation strength of the optical signal in the reflection fluctuation segment; Based on the optical signal attenuation strength and the difference in light source power at adjacent moments in the reflection fluctuation segment, the light source attenuation interference degree of each reflection fluctuation segment is obtained; The average value of the light source attenuation interference degree of all reflection fluctuation segments within the monitoring period is taken as the light source interference degree of the monitoring period; The product of the light source interference degree and the unexpectedness of the optical signal reflection during the monitoring period is taken as the optical cable performance error during the monitoring period.

6. The data processing method for testing avionics equipment according to claim 5, characterized in that: The specific method of obtaining the reflection change slope and several attenuation moments at each moment in the monitoring period includes: Based on the reflection intensities at adjacent moments within the monitoring period, the reflection intensity at any moment is subtracted from the reflection intensity at the previous moment. The difference between the reflection intensity at any moment and the difference between the adjacent moments in the optical signal time domain meter is used as the reflection change slope at that moment. The moments when the slope of the reflection change is negative during the monitoring period are recorded as attenuation moments.

7. The data processing method for testing avionics equipment according to claim 5, characterized in that: The specific method for obtaining the light source attenuation interference degree of each reflection fluctuation segment includes: Obtain the absolute value of the difference between the light source powers at any two adjacent moments in any reflection fluctuation segment, and take the average of the absolute values ​​of the difference between the light source powers at all adjacent moments in the reflection fluctuation segment and the product of the light signal attenuation intensity of the reflection fluctuation segment as the light source attenuation interference degree of the reflection fluctuation segment.

8. The method for processing data for testing avionics equipment according to claim 6, wherein: The specific method of obtaining the extra loss degree of the optical cable during the monitoring period includes: Based on the surface temperature data of the optical cable at each moment during the monitoring period, the temperature change slope at each moment is obtained; Based on the difference between the temperature change slope and the reflection change slope at each attenuation moment in the monitoring period, the additional loss degree of the optical cable during the monitoring period is obtained. The difference between the temperature change slope and the reflection change slope at each attenuation moment is recorded as the temperature interference loss factor at each attenuation moment. The additional loss degree of the optical cable is positively correlated with the temperature interference loss factor.

9. The method for processing data for testing avionics equipment according to claim 1, wherein: The test result correction coefficient of the monitoring period is obtained in the following way: The product of the optical cable performance error during the monitoring period and the degree of additional optical cable loss is normalized by inverse proportion to obtain the test result correction coefficient during the monitoring period.

10. The method for processing data for testing avionics equipment according to claim 1, wherein: The specific method of correcting the reflected signal waveform using the test result correction coefficient is as follows: In the test result analysis software in the OTDR system, enter the test result correction coefficient and multiply it with the original reflection signal waveform to obtain the corrected test result.

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