Electromagnetic environment monitoring method in large module joint debugging period

Abstract

The invention provides an electromagnetic environment monitoring method in a large module joint debugging period, which comprises the following steps of: firstly, determining a monitoring object and a monitoring part in a module according to the characteristics of an interference source and an electromagnetic interference risk possibly caused by the interference source, so that the monitoring scale can be effectively controlled, and the engineering practicability of monitoring can be enhanced; secondly, corresponding monitoring time and storage intervals are determined according to different types of monitoring objects and spectrum stability characteristics of the monitoring objects, so that a longer-time monitoring effect in unit time can be realized, and the method is particularly suitable for monitoring requirements of large-scale external field experiments such as module experiments as long as several months; data support can be provided for model overall electromagnetic compatibility evaluation, and the electromagnetic environment data acquisition requirement in the module joint debugging period is met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic testing, and particularly relates to a method for monitoring electromagnetic environment during large module joint debugging. BACKGROUND

[0002] With the development of construction technology, ships have entered the modular construction mode. By dividing the ship into different cabin sections, the equipment in the cabin section is assembled, debugged and tested separately in the workshop, and then pushed into the ship cabin shell by special equipment, and finally the whole ship is completed by folding. This segmented design, parallel construction and standardized interface greatly improves the overall efficiency of the ship, effectively reduces the cost and enhances the flexibility.

[0003] The electromagnetic compatibility design and control of each type (ship) usually includes three stages of equipment, system and overall, and after the design is completed, electromagnetic compatibility test is carried out to verify whether the predetermined design state is reached. With the emergence of modular construction stage, the new ship will also include "module" in the type electromagnetic compatibility design and test. Because "module" is significantly different from other stage products, it is the last land debugging stage of equipment, and the equipment and system are relatively complete, the interface connection is real, and it is the best opportunity to resolve electromagnetic compatibility risks, so it is necessary to collect electromagnetic emission (environment) data under various working conditions during module joint debugging test as much as possible to support the overall electromagnetic interference risk assessment.

[0004] The existing GJB151B electromagnetic compatibility test standard is carried out in the case of small size of the test piece, in a single (generally considered the maximum electromagnetic emission working condition) working condition, and in accordance with the test outline to test the predetermined part. It is the data of a certain working condition at a certain time, which cannot fully reflect the electromagnetic emission of the test piece under long-period working condition and working condition mutation. Therefore, the existing test method cannot fully meet the needs of module electromagnetic emission test, and an electromagnetic environment monitoring method and system that can be arranged by multiple points and real-time electromagnetic environment monitoring is urgently needed. SUMMARY

[0005] To solve the above problems, the present application provides a method for monitoring electromagnetic environment during large module joint debugging. First, the monitoring object and part are determined according to the difference of the equipment on the module, then the electromagnetic environment monitoring system is built accordingly, and finally the data statistical processing is carried out after the module is wired and the sensor is adjusted. It can provide data support for type overall electromagnetic compatibility evaluation and meet the electromagnetic environment data acquisition needs during "module" joint debugging.

[0006] A method for monitoring electromagnetic environment during large module joint debugging, comprising the following steps:

[0007] Step 1: Determine the electronic equipment and electrical equipment in the to-be-tested module that need to be monitored, as well as their monitoring objects and monitoring positions, according to the interference characteristics of various electronic equipment and electrical equipment in the to-be-tested module;

[0008] Step 2: Build a monitoring system according to the electronic equipment and electrical equipment that need to be monitored, as well as their monitoring objects and monitoring positions, and determine the minimum frequency spectrum storage interval time for each monitoring object according to the type of the monitoring object;

[0009] Step 3: After the monitoring system runs for a set period of time, store the data of each monitoring object according to the minimum frequency spectrum storage interval time, and process the data of each monitoring object using a daily processing mode, a working condition processing mode, a time period processing mode, or a mode processing mode, to complete the electromagnetic environment monitoring of the to-be-tested module.

[0010] Further, the electrical equipment includes power generation and transformation equipment, high-power equipment above 1kW, and frequency conversion equipment; the electronic equipment includes frequency use equipment and computer equipment;

[0011] Determine the monitoring objects and monitoring positions of the power generation and transformation equipment according to the interference source and interference path of the power generation and transformation equipment; wherein the monitoring objects of the power generation and transformation equipment include electric field, magnetic field, and power grid; the monitoring positions of the power generation and transformation equipment include its own power supply position, other power supply positions directly connected to its own power supply position, and power cables connected to its own power supply position;

[0012] Determine the monitoring objects and monitoring positions of the high-power equipment according to the influence of the starting process of the high-power equipment on the power grid; wherein the monitoring object of the high-power equipment is the power grid; the monitoring position of the high-power equipment is the power distribution position of other equipment that is in the same power grid as the high-power equipment;

[0013] Determine the monitoring objects and monitoring positions of the frequency conversion equipment according to the interference conduction mode and frequency conversion output of the frequency conversion equipment; wherein the monitoring objects of the frequency conversion equipment include magnetic field and power grid; the monitoring positions of the frequency conversion equipment include frequency conversion cables and power distribution positions of other equipment that is in the same power grid as the frequency conversion equipment;

[0014] Determine the monitoring objects and monitoring positions of the frequency use equipment according to the interference source of the frequency use equipment; wherein the monitoring objects of the frequency use equipment include electric field, magnetic field, power grid, and cable coupling effect; the monitoring positions of the frequency use equipment include the arrangement area of the frequency use equipment, the analog cable used, and the signal cable;

[0015] Determine the monitoring objects and monitoring positions of the computer equipment according to the interference source of the computer equipment; wherein the monitoring objects of the computer equipment include electric field and magnetic field; the monitoring position of the computer equipment is its own power supply position.

[0016] Furthermore, the monitoring frequency band of the electric field is 10kHz-30MHz; the monitoring frequency band of the cable coupling effect is 1kHz-1MHz; the monitoring frequency band of the magnetic field is 25Hz-100kHz; and the monitoring frequency band of the power grid environment is 25Hz-30MHz; among them, the magnetic field monitoring frequency band of the frequency-using equipment is equivalent to the order of magnitude of the operating frequency of the frequency-using equipment.

[0017] Furthermore, the monitoring system includes a host computer, monitoring units with various functions, and sensors with various functions;

[0018] Among them, the monitoring units with various functions include an electric field monitoring unit, a magnetic field monitoring unit, a power grid monitoring unit, and a cable coupling effect monitoring unit connected to the host computer; at the same time, the electric field monitoring unit is connected to multiple electric field sensors arranged at different monitoring locations; the magnetic field monitoring unit is connected to multiple magnetic field sensors arranged at different monitoring locations; the power grid monitoring unit is connected to multiple power grid sensors arranged at different monitoring locations; and the cable coupling effect monitoring unit is connected to multiple cable coupling effect sensors arranged at different monitoring locations.

[0019] Furthermore, the host computer is used to display the real-time spectrum of each monitoring part; it is also used to store the data of each monitoring object according to time information, and the monitoring object data should at least include the storage time, monitoring part, and value; it is also used to store the monitoring object data as a text file, and establish a directory according to the monitoring object, and establish sub-directories under the directory according to days, and store data files under the sub-directories, and the data files are named with timestamps; it is also used to automatically record the working condition information of the module to be tested during the joint debugging, and the working condition information at least includes the start time and the working condition name; it is also used to replay the monitoring object data according to time, monitoring part, and monitoring object.

[0020] Furthermore, the spacing between the signal cables of sensors with various functions and the cables of monitoring units with various functions is at least 1m. For cables whose spacing cannot be maintained at at least 1m, they are arranged perpendicular to each other; Ethernet communication cables cannot be laid parallel to high-power power cables, and must be kept at least 50cm apart; the grounding resistance of sensors with various functions is less than 5mΩ; the power grid sensor is arranged near the distribution box under test; the cable coupling effect sensor is arranged 5-10cm from the interface of the cable under test.

[0021] Furthermore, the method for determining the minimum spectrum storage interval time of each monitored object according to the type of the monitored object is:

[0022] The monitoring objects include spectrum-type electromagnetic environment parameters, steady-state value monitoring parameters, and grid transient spikes. Spectrum-type electromagnetic environment parameters include magnetic field, electric field, grid low-frequency / radiofrequency conducted emissions, and cable coupling effects; steady-state value monitoring parameters include voltage RMS, frequency, and waveform distortion rate.

[0023] The minimum spectrum storage interval for magnetic fields, low-frequency / radio-frequency conducted emissions from power grids, and cable coupling effects is twice the stable operating time of the interference source equipment.

[0024] The minimum spectrum storage interval of the electric field is four times the stable working time of the interference source equipment;

[0025] The minimum spectrum storage interval of the steady-state value monitoring parameter is twice the stable working time of the interference source equipment;

[0026] The minimum spectrum storage interval of a grid transient spike is the actual occurrence time of the grid transient spike.

[0027] Furthermore, when the daily processing mode is used to process the data of each monitoring object, for spectrum-type monitoring objects, the amplitudes corresponding to all frequencies of the monitoring object data of each monitoring object are taken out every day, and the basic statistical data corresponding to each monitoring object are obtained respectively, wherein the basic statistical data include the maximum amplitude, the minimum amplitude, the average amplitude, the median amplitude and the corresponding working condition; for time-domain monitoring objects, the waveform maximum value and the corresponding working condition in the monitoring object data of each monitoring object every day are counted;

[0028] When the data of each monitoring object is processed in the working condition processing mode, the frequency spectrum of the monitoring object data under different working conditions is counted respectively;

[0029] When the time period processing mode is adopted to process the data of each monitoring object, the frequency spectrum of the monitoring object data in different time periods is counted respectively.

[0030] Furthermore, the method for processing the data of each monitoring object using the mode processing mode is as follows:

[0031] Step 31: define the mode step length, wherein the mode step length includes the minority step length, the middle majority step length, and the majority step length, and the minority step length < the middle majority step length < the majority step length;

[0032] Assume that any frequency has the following set of amplitudes at different times:

[0033] Min, A1, A2, ....An, Max;

[0034] Starting from the minimum value Min, the amplitude space is divided into the following amplitude spaces according to the defined mode step size until the amplitude space containing the maximum value Max appears:

[0035] S1=(Min,Min+Step);

[0036] S2=(Min+Step, Min+Step);

[0037] Sm=(Min+(m-1)×Step, Min+m×Step);

[0038] Among them, Step is the mode step size; S1~Sm is the amplitude space;

[0039] Step 32: Under different mode step sizes, determine the mode value of each frequency according to the following method:

[0040] Assume that any frequency Fx has the following r amplitude values:

[0041] A1, A2, ..., Ar-1, Ar;

[0042] According to the amplitude space determined in step 31, all amplitude values ​​are placed in the corresponding amplitude space respectively, the amplitude space containing the most amplitude values ​​is used as the mode space, and the average value of all amplitude values ​​contained in the mode space is used as the mode value at that frequency;

[0043] Step 33: After all frequencies are processed in the manner of step 32, a set of full-band minority mode spectra, medium mode spectra, and majority mode spectra are obtained, which together constitute the majority spectrum.

[0044] Furthermore, when the monitored object data is the electric field spectrum, the minority step size is set to 6dB, the medium step size is set to 10dB, and the majority step size is set to 20dB;

[0045] When the monitored object data is the magnetic field spectrum, the minority step size is set to 3dB, the medium step size is set to 6dB, and the majority step size is set to 10dB;

[0046] When the monitored object data is the power grid spectrum, the minority step size is set to 5dB, the medium step size is set to 8dB, and the majority step size is set to 16dB.

[0047] Beneficial effects:

[0048] 1. The present invention provides an electromagnetic environment monitoring method during the joint debugging of large modules. First, the monitoring objects and monitoring locations in the module are determined according to the characteristics of the interference source and the electromagnetic interference risks it may cause, which can effectively control the monitoring scale and enhance the engineering practicality of the monitoring. Secondly, according to different types of monitoring objects, the corresponding monitoring time and storage interval are determined according to their spectrum stability characteristics, which can achieve a longer monitoring effect per unit time. The method is particularly suitable for the monitoring needs of large-scale field experiments such as similar module experiments that last for several months. It can provide data support for the overall electromagnetic compatibility assessment of the model and meet the electromagnetic environment data collection needs during the "module" joint debugging.

[0049] 2. The present invention provides a method for monitoring the electromagnetic environment during the joint debugging of large modules. By extracting effective spectrum features from massive spectrum data through the mode processing mode, the electromagnetic characteristics of the module can be comprehensively and intuitively reflected. Based on this, the electromagnetic compatibility risk of the module can be analyzed, providing sufficient support for the overall electromagnetic compatibility assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A flow chart of a method for monitoring the electromagnetic environment during large-scale module joint debugging provided by the present invention;

[0051] Figure 2 Schematic diagram of the electromagnetic environment monitoring system provided by the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0053] like Figure 1 As shown, a method for monitoring the electromagnetic environment during large-scale module joint debugging includes the following steps:

[0054] Step 1: Determine the electronic equipment and electrical equipment that need to be monitored in the module under test, as well as their monitoring objects and monitoring locations, based on the interference characteristics of various electronic equipment and electrical equipment in the module under test;

[0055] It should be noted that the module generally includes various electronic and electrical equipment. However, due to construction requirements, the modules are generally larger and more powerful. These devices are often sources of electromagnetic interference and are likely to interfere with electronic equipment. Therefore, it is necessary to determine the interference characteristics based on the characteristics of the electrical equipment, and then determine the corresponding monitoring objects and locations based on the interference characteristics. Specifically, electrical equipment includes power generation and transformation equipment, high-power equipment above 1kW, and frequency conversion equipment; electronic equipment includes frequency-consuming equipment and computer equipment.

[0056] 1) Determine the monitoring objects and locations of power generation and transformation equipment based on the interference sources and interference paths of the equipment. The monitoring objects of power generation and transformation equipment include electric fields, magnetic fields, and power grids. The monitoring locations of power generation and transformation equipment include its own power supply location, other power supply locations directly connected to its own power supply location, and the power cables connected to its own power supply location.

[0057] It should be noted that since the main interference characteristics of power generation and transformation equipment are low-frequency conducted interference characteristics, that is, the source of the interference comes from its power conversion module, it will cause obvious interference characteristics on its input / output power lines. This interference will generally be transmitted along the power supply cable to other power supply parts. At the same time, there will also be obvious interference electromagnetic fields near the power supply cable. Therefore, the monitoring locations for such equipment should be: one is the power grid environment parameters of its power supply part and other connected power supply parts, and the other is the electromagnetic field near the power cable.

[0058] 2) Determine the monitoring object and monitoring location of the high-power equipment based on the impact of the startup process of the high-power equipment on the power grid; the monitoring object of the high-power equipment is the power grid; the monitoring location of the high-power equipment is the power distribution location of other equipment in the same power grid as the high-power equipment;

[0059] It should be noted that high-power electrical equipment generally consumes a lot of power. During the startup process, it will cause a brief impact on the power grid, forming transient spike voltage / current interference, which will reduce the power supply quality of the power grid and may affect the normal operation of other common network equipment. Therefore, the power grid environment of the relevant common network distribution parts should be monitored.

[0060] 3) Determine the monitoring objects and monitoring locations of the frequency conversion equipment based on the interference conduction mode and frequency conversion output of the frequency conversion equipment. The monitoring objects of the frequency conversion equipment include the magnetic field and the power grid. The monitoring locations of the frequency conversion equipment include the frequency conversion cable and the power distribution locations of other equipment in the same power grid as the frequency conversion equipment.

[0061] It should be noted that variable frequency electrical equipment generally has a large power and the switching frequency of the internal power conversion devices is relatively low (3kHz-10kHz). Its interference still affects other network-connected equipment in a conductive manner, or the magnetic field generated by its power output cable after frequency conversion interferes with other weak signal cables. Therefore, the grid environmental parameters of other distribution parts of the common network should be monitored, and the magnetic field near the variable frequency output cable should also be monitored.

[0062] 4) Determine the monitoring objects and monitoring locations of frequency-using equipment based on the interference sources of the frequency-using equipment. The monitoring objects of frequency-using equipment include electric fields, magnetic fields, power grids, and cable coupling effects. The monitoring locations of frequency-using equipment include the layout area of ​​the frequency-using equipment, the analog cables used, and the signal cables used.

[0063] It should be noted that frequency-using electronic equipment that uses specific frequencies in wireless communications and spectrum management is generally susceptible to interference. This interference may come from electric and magnetic fields in space and induced electromagnetic fields on signal cables, or from co-frequency interference on the power grid that overlaps with its operating frequency band. Therefore, it is necessary to monitor the electric and magnetic fields in the area where such equipment is deployed, as well as the induced current in the shielding layer of the signal cable.

[0064] 5) Determine the monitoring objects and monitoring locations of computer equipment based on the interference sources of computer equipment; the monitoring objects of computer equipment include electric fields and magnetic fields; the monitoring location of computer equipment is its own power supply location.

[0065] It should be noted that general computer electronic equipment may also be interfered with, but because they do not have a typical operating frequency, they are often more susceptible to transient impact interference from the power grid, which can easily cause them to freeze, restart, or have a black screen. Therefore, it is necessary to monitor the quality of the power grid at their power supply location.

[0066] According to the above principles, the monitoring objects and monitoring sites are detailed in Table 1.

[0067] Table 1 Principles for sorting out monitoring objects

[0068]

[0069] Note: 1) The general frequency range for electric field monitoring is 10kHz-30MHz; the general frequency range for magnetic field monitoring is 25Hz-100kHz;

[0070] 2) The monitoring frequency band of the power grid environment is 25Hz-30MHz, which usually includes waveform distortion rate (single harmonic and total harmonic), power grid low-frequency conducted emission (25Hz-15kHz), power grid radio frequency conducted emission (15kHz-30MHz), power grid transient spikes (time domain waveform)

[0071] 3) When monitoring electromagnetic fields near frequency-using electronic equipment, sensors that match their operating frequencies should be selected;

[0072] 4) The frequency band for cable environment / effect monitoring is generally 1kHz-1MHz.

[0073] Step 2: Build a monitoring system based on the electronic equipment and electrical equipment to be monitored, their monitored objects, and monitored locations, and determine the minimum spectrum storage interval for each monitored object based on the type of monitored object.

[0074] like Figure 2 As shown in the figure, a typical electromagnetic environment monitoring system consists of a host computer, (functional) monitoring units (slave computers) and various functional sensors. The functional sensors collect analog signals and send them to each monitoring unit. The monitoring unit digitizes the analog signals, completes the electromagnetic environment analysis according to the built-in software, and uploads them to the (electromagnetic environment comprehensive monitoring) host computer via Ethernet for display, comprehensive monitoring, data storage, etc.

[0075] For the selection of functional sensors, please refer to the corresponding items in GJB151B and HJB237, or select sensors with the same type of parameters. For example:

[0076] 1) Magnetic field sensor: Selectable receiving loop antenna (diameter 13.3 cm, 36 turns, DC resistance 5-10 Ω);

[0077] 2) Electric field sensor: For example, 10k-30MHz frequency band, selectable 104cm rod antenna; 30MHz-200MHz frequency band, selectable double cone antenna (top distance 137cm), or integrated electric field antenna such as near-field probe, etc.

[0078] 3) Power grid sensor generally includes power grid conducted interference sensor, peak sensor, etc., the power grid conducted interference sensor can select a resistance-capacitance sensor (0.25uF and 1kΩ in parallel, sampling 1kΩ), and the peak sensor can adopt a high-voltage differential voltage probe.

[0079] 4) Cable coupling effect sensor, generally select a current probe matched with the monitoring frequency band.

[0080] The above sensors can be adjusted according to the situation, but must be metered to obtain the required transfer parameters.

[0081] When determining the monitoring unit, it must be matched with the measured physical quantity, including: minimum signal, maximum signal, dynamic range, frequency range, accuracy, etc., which should generally be higher than the measured quantity by one order of magnitude. The internal frequency spectrum analysis of the monitoring unit should meet the requirements of Table 2.

[0082] Table 2: Frequency spectrum analysis bandwidth and resolution requirements

[0083]

[0084] It should be noted that the upper computer of the electromagnetic environment comprehensive monitoring should at least have the following functions:

[0085] ①Comprehensive display of real-time frequency spectrum of each monitoring part;

[0086] ②Ability to store data of each monitoring item according to time information, which should at least include time, part, data, etc.;

[0087] ③Data storage can be stored as a text file, a directory is established according to the monitoring item, a subdirectory is established under the directory according to the day, and a data file is stored under the subdirectory, and the data file is named by time stamp;

[0088] ④Ability to manually or automatically record working condition information during module commissioning, which at least includes start time and working condition name;

[0089] ⑤Monitoring data can be played back according to time, part, item, etc.

[0090] Further, the present application can also adjust the field wiring and sensor position, and the arrangement requirements are as follows:

[0091] 1) The analog signal cable from the sensor to the unit must be at least 1m away from other cables in the module joint debugging site. If laying them close together is unavoidable, they can be laid vertically and isolated by means of enhanced shielding, etc.

[0092] 2) Ethernet communication cables should not be laid parallel to or close to high-power power cables, and should be kept at least 50 cm apart;

[0093] 3) The sensor must be well grounded where it is placed, and the grounding resistance should be less than 5mΩ;

[0094] 4) The magnetic field sensor layout needs to be adjusted according to the following steps;

[0095] 4a) Connect the magnetic field sensor to the spectrum analyzer and ensure that it can receive signals normally.

[0096] 4b) Arrange the magnetic field sensors in a vertical direction at the module site;

[0097] 4c) The equipment in the tested area is turned on and working normally;

[0098] 4d) The spectrum analyzer records the amplitude corresponding to the characteristic frequency of the measured frequency band;

[0099] 4e) Change the direction of the magnetic field sensor, usually by 90 degrees, and repeat step 4d).

[0100] 4f) Determine the sensor orientation corresponding to the maximum amplitude and install it securely.

[0101] 5) If the electric field sensor uses a near-field probe or similar directional antenna, the position should be adjusted with reference to the magnetic field sensor;

[0102] 6) Grid sensors are typically placed near the distribution box being tested. A power cord is connected from the distribution box's backup branch to a socket. The power cord should be less than 60 cm long. The sensor collects signals through a plug or other means.

[0103] 7) Cable environment sensors are generally placed 5-10 cm away from the interface of the cable being tested. The cable should be kept in the center of the sensor and padded with insulating pads to keep it insulated from the metal body.

[0104] Furthermore, each monitoring object should set the data monitoring and storage interval according to the test conditions and requirements. The method for the minimum spectrum storage interval of each monitoring object is as follows:

[0105] 1) The purpose of monitoring the spectrum electromagnetic environment (such as magnetic fields, electric fields, low-frequency / RF conducted emissions from the power grid, and cable environmental effects) is to monitor their steady-state properties. Therefore, it needs to be implemented after various interference source devices are in a stable working state. Various interference source devices on the module are generally high-power devices, and their stable operation generally requires about 10-15 seconds. To ensure that the interference source devices are completely stable, the minimum spectrum storage interval for magnetic fields, low-frequency / RF conducted emissions from the power grid, and cable coupling effects is generally twice the stable working time of the interference source devices, that is, 30 seconds. Electric field monitoring is generally in the far field, and a larger margin is required to obtain better monitoring results. Therefore, four times the stable working time, that is, 60 seconds, is generally used as the minimum spectrum storage interval.

[0106] 2) Other steady-state monitoring objects (such as voltage RMS, frequency, and waveform distortion rate) generally reach stability quickly, usually 2-3 seconds. Therefore, according to the 2-fold principle, the minimum spectrum storage interval is generally selected to be 5-6 seconds.

[0107] 3) The grid transient spike itself is a monitoring transient interference signal, which is more about setting a reasonable trigger level, so there is no minimum spectrum storage interval.

[0108] In summary, typical monitoring parameters such as the frequency range and minimum spectrum storage interval of each project can be implemented with reference to Table 3.

[0109] Table 3 Minimum storage interval time for each monitoring item

[0110]

[0111] Step 3: After the monitoring system runs for the set time, the data of each monitored object is stored according to the minimum spectrum storage interval, and the data of each monitored object is processed using the daily processing mode, the working condition processing mode, the time period processing mode, or the majority processing mode to complete the electromagnetic environment monitoring of the module under test.

[0112] That is to say, the present invention can download the data files of each monitoring project on the host computer according to the needs of electromagnetic compatibility assessment, and perform statistical processing and analysis. The typical analysis mode is as follows:

[0113] Mode 1: Daily processing mode.

[0114] When the daily processing mode is used to process the data of each monitoring object, for spectrum-type monitoring objects, the amplitudes corresponding to all frequencies of the monitoring object data of each monitoring object every day are taken out, and the basic statistical data corresponding to each monitoring object are obtained respectively, where the basic statistical data include the maximum amplitude, the minimum amplitude, the average amplitude, the median amplitude and the corresponding working conditions; for time domain-type monitoring objects, the waveform maximum value and the corresponding working conditions in the monitoring object data of each monitoring object every day are counted.

[0115] Mode 2: Processing mode based on working conditions.

[0116] When the data of each monitoring object is processed in the processing mode according to the working condition, the frequency spectrum of the monitoring object data under different working conditions is counted respectively.

[0117] Mode 3: Processing mode by time period.

[0118] When the time period processing mode is adopted to process the data of each monitoring object, the frequency spectrum of the monitoring object data in different time periods is counted respectively.

[0119] Mode 4: Mode of processing based on majority.

[0120] It should be noted that the spectrum measurement result is a two-dimensional array of frequency and amplitude, while the monitoring data has an additional dimension, namely time. The amplitude corresponding to the same frequency at different times will be different, and sometimes there will not even be completely equal amplitudes. Therefore, it is necessary to first define the range (space). Generally, a 3dB range is set for niche, a 6dB range is set for medium, and a 10dB range is set for mass. This means that all amplitudes corresponding to a certain frequency are divided into several spaces, and the space with the most data values ​​is the mode space. The specific processing steps are as follows:

[0121] Step 31: define the mode step length, wherein the mode step length includes the minority step length, the middle majority step length, and the majority step length, and the minority step length < the middle majority step length < the majority step length;

[0122] Assume that any frequency has the following set of amplitudes at different times:

[0123] Min, A1, A2, ....An, Max;

[0124] Starting from the minimum value Min, the amplitude space is divided into the following amplitude spaces according to the defined mode step size until the amplitude space containing the maximum value Max appears:

[0125] S1=(Min,Min+Step);

[0126] S2=(Min+Step, Min+Step);

[0127] Sm=(Min+(m-1)×Step, Min+m×Step);

[0128] Among them, Step is the mode step size; S1~Sm is the amplitude space;

[0129] When the monitored object data is the electric field spectrum, the niche step size is set to 6dB, the medium step size is set to 10dB, and the mass step size is set to 20dB; when the monitored object data is the magnetic field spectrum, the niche step size is set to 3dB, the medium step size is set to 6dB, and the mass step size is set to 10dB; when the monitored object data is the power grid spectrum, the niche step size is set to 5dB, the medium step size is set to 8dB, and the mass step size is set to 16dB.

[0130] Step 32: Under different mode step sizes, determine the mode value of each frequency according to the following method:

[0131] Assume that any frequency Fx has the following r amplitude values:

[0132] A1, A2, ..., Ar-1, Ar;

[0133] According to the amplitude space determined in step 31, all amplitude values ​​are placed in the corresponding amplitude space respectively, the amplitude space containing the most amplitude values ​​is used as the mode space, and the average value of all amplitude values ​​contained in the mode space is used as the mode value at that frequency;

[0134] Step 33: After all frequencies are processed in the manner of step 32, a set of full-band minority mode spectra, medium mode spectra, and majority mode spectra are obtained, which together constitute the majority spectrum.

[0135] Thus, the application of the present invention can realize the electromagnetic environment monitoring in the "module" joint debugging stage, and provide data support for the overall electromagnetic compatibility assessment.

[0136] Those skilled in the art can use other similar methods to implement specific "module" joint debugging stage electromagnetic environment monitoring based on the content disclosed in the present invention, and are not limited to Figure 1 and Figure 2 The method shown.

[0137] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may of course make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for monitoring the electromagnetic environment during large-scale module joint debugging, characterized in that: The following steps are involved: Step 1: Determine the electronic equipment and electrical equipment that need to be monitored in the module under test, as well as their monitoring objects and monitoring locations, based on the interference characteristics of various electronic equipment and electrical equipment in the module under test; Step 2: Build a monitoring system based on the electronic equipment and electrical equipment to be monitored, their monitored objects, and monitored locations, and determine the minimum spectrum storage interval for each monitored object based on the type of monitored object. Step 3: After the monitoring system runs for the set time, the data of each monitored object is stored according to the minimum spectrum storage interval, and the data of each monitored object is processed using the daily processing mode, the working condition processing mode, the time period processing mode, or the majority processing mode to complete the electromagnetic environment monitoring of the module under test.

2. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 1, characterized in that: Electrical equipment includes power generation and transformation equipment, high-power equipment above 1kW, and frequency conversion equipment; electronic equipment includes frequency-using equipment and computer equipment; Determine the monitoring objects and locations of power generation and transformation equipment based on the interference sources and interference paths of the equipment. The monitoring objects of power generation and transformation equipment include electric fields, magnetic fields, and power grids. The monitoring locations of power generation and transformation equipment include its own power supply location, other power supply locations directly connected to its own power supply location, and the power cables connected to its own power supply location. Determine the monitoring object and monitoring location of the high-power equipment based on the impact of the startup process of the high-power equipment on the power grid; the monitoring object of the high-power equipment is the power grid; the monitoring location of the high-power equipment is the power distribution location of other equipment in the same power grid as the high-power equipment; Determine the monitoring objects and monitoring locations of the frequency conversion equipment based on the interference conduction mode and frequency conversion output of the frequency conversion equipment. The monitoring objects of the frequency conversion equipment include the magnetic field and the power grid. The monitoring locations of the frequency conversion equipment include the frequency conversion cable and the power distribution locations of other equipment in the same power grid as the frequency conversion equipment. Determine the monitoring objects and monitoring locations of frequency-using equipment based on the interference sources of the equipment. The monitoring objects of frequency-using equipment include electric fields, magnetic fields, power grids, and cable coupling effects. The monitoring locations of frequency-using equipment include the layout area of ​​the equipment, the analog cables used, and the signal cables used. The monitoring objects and monitoring parts of the computer equipment are determined according to the interference sources of the computer equipment; the monitoring objects of the computer equipment include electric fields and magnetic fields; the monitoring part of the computer equipment is its own power supply part.

3. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 2, characterized in that: The monitoring frequency band for electric fields is 10kHz-30MHz; the monitoring frequency band for cable coupling effects is 1kHz-1MHz; the monitoring frequency band for magnetic fields is 25Hz-100kHz; and the monitoring frequency band for power grid environments is 25Hz-30MHz. Among them, the monitoring frequency band for magnetic fields of frequency-using equipment is of the same order of magnitude as the operating frequency of the frequency-using equipment.

4. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 1, characterized in that: The monitoring system includes a host computer, monitoring units with various functions, and sensors with various functions; Among them, the monitoring units with various functions include an electric field monitoring unit, a magnetic field monitoring unit, a power grid monitoring unit, and a cable coupling effect monitoring unit connected to the host computer; at the same time, the electric field monitoring unit is connected to multiple electric field sensors arranged at different monitoring locations; the magnetic field monitoring unit is connected to multiple magnetic field sensors arranged at different monitoring locations; the power grid monitoring unit is connected to multiple power grid sensors arranged at different monitoring locations; and the cable coupling effect monitoring unit is connected to multiple cable coupling effect sensors arranged at different monitoring locations.

5. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 4, characterized in that: The host computer is used to display the real-time spectrum of each monitoring part; it is also used to store the data of each monitoring object according to time information, and the monitoring object data should at least include the storage time, monitoring part, and value; it is also used to store the monitoring object data as a text file, and establish a directory according to the monitoring object, and establish subdirectories under the directory according to the day, and store data files under the subdirectory, and the data files are named with timestamps; it is also used to automatically record the working condition information of the module to be tested during the joint debugging, and the working condition information at least includes the start time and the working condition name; it is also used to replay the monitoring object data according to time, monitoring part, and monitoring object.

6. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 4, characterized in that: The distance between the signal cables of sensors with various functions and the cables of monitoring units with various functions shall be at least 1m. For cables that cannot maintain a distance of at least 1m, they shall be arranged perpendicular to each other; Ethernet communication cables shall not be laid parallel to high-power power cables and shall be kept at least 50cm apart; the grounding resistance of sensors with various functions shall be less than 5mΩ; the power grid sensor shall be arranged near the distribution box under test; the cable coupling effect sensor shall be arranged 5-10cm from the interface of the cable under test.

7. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 1, characterized in that: The method for determining the minimum spectrum storage interval of each monitored object according to the type of monitored object is: The monitoring objects include spectrum-type electromagnetic environment parameters, steady-state value monitoring parameters, and grid transient spikes. Spectrum-type electromagnetic environment parameters include magnetic field, electric field, grid low-frequency / radiofrequency conducted emissions, and cable coupling effects; steady-state value monitoring parameters include voltage RMS, frequency, and waveform distortion rate. The minimum spectrum storage interval for magnetic fields, low-frequency / radio-frequency conducted emissions from power grids, and cable coupling effects is twice the stable operating time of the interference source equipment. The minimum spectrum storage interval of the electric field is four times the stable working time of the interference source equipment; The minimum spectrum storage interval of the steady-state value monitoring parameter is twice the stable working time of the interference source equipment; The minimum spectrum storage interval of a grid transient spike is the actual occurrence time of the grid transient spike.

8. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 1, characterized in that: When the daily processing mode is used to process the data of each monitoring object, for spectrum-type monitoring objects, the amplitudes corresponding to all frequencies of the monitoring object data of each monitoring object are taken out every day, and the basic statistical data corresponding to each monitoring object are obtained respectively, where the basic statistical data include the maximum amplitude, minimum amplitude, average amplitude, median amplitude and the corresponding working condition; for time-domain monitoring objects, the maximum waveform value and the corresponding working condition in the monitoring object data of each monitoring object are counted every day; When the data of each monitoring object is processed in the working condition processing mode, the frequency spectrum of the monitoring object data under different working conditions is counted respectively; When the time period processing mode is adopted to process the data of each monitoring object, the frequency spectrum of the monitoring object data in different time periods is counted respectively.

9. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 1, characterized in that: The method of processing the data of each monitoring object using the mode processing mode is as follows: Step 31: define the mode step length, wherein the mode step length includes the minority step length, the middle majority step length, and the majority step length, and the minority step length < the middle majority step length < the majority step length; Assume that any frequency has the following set of amplitudes at different times: Min, A1, A2, .... An, Max; Starting from the minimum value Min, the amplitude space is divided into the following amplitude spaces according to the defined mode step size until the amplitude space containing the maximum value Max appears: S1=(Min,Min+Step); S2=(Min+Step, Min+Step); Sm=(Min+(m-1)×Step, Min+m×Step); Among them, Step is the mode step size; S1~Sm is the amplitude space; Step 32: Under different mode step sizes, determine the mode value of each frequency according to the following method: Assume that any frequency Fx has the following r amplitude values: A1, A2, ..., Ar-1, Ar; According to the amplitude space determined in step 31, all amplitude values ​​are placed in the corresponding amplitude space respectively, the amplitude space containing the most amplitude values ​​is used as the mode space, and the average value of all amplitude values ​​contained in the mode space is used as the mode value at that frequency; Step 33: After all frequencies are processed in the manner of step 32, a set of full-band minority mode spectra, medium mode spectra, and majority mode spectra are obtained, which together constitute the majority spectrum.

10. The electromagnetic environment monitoring method during large-scale module joint debugging according to claim 9, characterized in that: When the monitored object data is the electric field spectrum, the minority step size is set to 6dB, the medium step size is set to 10dB, and the majority step size is set to 20dB; When the monitored object data is the magnetic field spectrum, the minority step size is set to 3dB, the medium step size is set to 6dB, and the majority step size is set to 10dB; When the monitored object data is the power grid spectrum, the minority step size is set to 5dB, the medium step size is set to 8dB, and the majority step size is set to 16dB.

Images