A method for monitoring electromagnetic environment during large module joint debugging

Abstract

The application provides a large module joint debugging period electromagnetic environment monitoring method, first, according to the characteristics of the interference source and the electromagnetic interference risk possibly caused by the interference source, the monitoring object and the monitoring position in the module are determined, the monitoring scale can be effectively controlled, and the engineering practicability of monitoring is enhanced; second, according to different types of monitoring objects, the corresponding monitoring time and storage interval are determined according to the frequency spectrum stability characteristics, the longer time monitoring effect in unit time can be realized, especially suitable for the monitoring demand of large field experiments such as module experiments for several months, data support can be provided for the electromagnetic compatibility evaluation of the whole type, and the electromagnetic environment data acquisition demand during 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 length 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 of processing according to the mode, to complete the electromagnetic environment monitoring of the to-be-tested module.

[0010] Further, the electrical equipment includes power generation and transformation equipment; and the electronic equipment includes frequency-using equipment and computer equipment.

[0011] Determine the monitoring objects and monitoring positions of the power generation and transformation equipment according to the interference sources and interference paths 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; and the monitoring positions of the power generation and transformation equipment include the power supply position of the power generation and transformation equipment, other power supply positions directly connected to the power supply position of the power generation and transformation equipment, and power cables connected to the power supply position of the power generation and transformation equipment.

[0012] Determine the monitoring objects and monitoring positions of the frequency-using equipment according to the interference sources of the frequency-using equipment; wherein the monitoring objects of the frequency-using equipment include electric field, magnetic field, power grid, and cable coupling effect; and the monitoring positions of the frequency-using equipment include the arrangement area of the frequency-using equipment, the analog cable used by the frequency-using equipment, and the signal cable used by the frequency-using equipment.

[0013] Determine the monitoring objects and monitoring positions of the computer equipment according to the interference sources of the computer equipment; wherein the monitoring objects of the computer equipment include electric field and magnetic field; and the monitoring position of the computer equipment is the power supply position of the computer equipment.

[0014] Further, the monitoring frequency band of the electric field is 10 kHz-30 MHz; the monitoring frequency band of the cable coupling effect is 1 kHz-1 MHz; the monitoring frequency band of the magnetic field is 25 Hz-100 kHz; the monitoring frequency band of the power grid environment is 25 Hz-30 MHz; and the monitoring frequency band of the magnetic field of the frequency-using equipment is comparable to the order of magnitude of the working frequency of the frequency-using equipment.

[0015] Further, the monitoring system includes an upper computer, monitoring units of various functions, and sensors of various functions.

[0016] The monitoring units of 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 with the upper computer; meanwhile, the electric field monitoring unit is connected with a plurality of electric field sensors arranged at different monitoring sites; the magnetic field monitoring unit is connected with a plurality of magnetic field sensors arranged at different monitoring sites; the power grid monitoring unit is connected with a plurality of power grid sensors arranged at different monitoring sites; and the cable coupling effect monitoring unit is connected with a plurality of cable coupling effect sensors arranged at different monitoring sites.

[0017] Further, the upper computer is used to display real-time frequency spectrum of each monitoring site, and is also used to store data of each monitoring object according to time information, and the monitoring object data should at least include storage time, monitoring site, and value; the upper computer is also used to store the monitoring object data as a text file, and establish a directory according to the monitoring object, establish a subdirectory according to day under the directory, and store data files under the subdirectory, and the data files are named by time stamp; the upper computer is also used to automatically record working condition information during module joint debugging of a to-be-tested module, and the working condition information at least includes starting time and working condition name; and the upper computer is also used to play back the monitoring object data according to time, monitoring site, and monitoring object.

[0018] Further, the spacing between the signal cables of the sensors of various functions and the cable cables of the monitoring units of various functions is at least 1 m, and for the cables whose spacing cannot be kept at least 1 m, the cables are arranged in a vertical manner; the Ethernet communication cable cannot be laid in parallel with the high-power power cable, and at least more than 50 cm is kept; the grounding resistance of the sensors of various functions is less than 5 mΩ; the power grid sensor is arranged near a measured distribution box; and the cable coupling effect sensor is arranged at a position 5-10 cm away from a measured cable interface.

[0019] Further, the method for determining the minimum frequency spectrum storage interval time of each monitoring object according to the type of the monitoring object is as follows:

[0020] The monitoring object includes spectrum electromagnetic environment parameters, steady-state value monitoring parameters, and power grid transient peak, wherein the spectrum electromagnetic environment parameters include magnetic field, electric field, power grid low frequency / radio frequency conducted emission, and cable coupling effect; the steady-state value monitoring parameters include voltage effective value, frequency, and waveform distortion rate;

[0021] The minimum frequency spectrum storage interval time of the magnetic field, the power grid low frequency / radio frequency conducted emission, and the cable coupling effect is 2 times of the stable working time of the interference source equipment;

[0022] The minimum frequency spectrum storage interval time of the electric field is 4 times of the stable working time of the interference source equipment;

[0023] The minimum frequency spectrum storage interval time of the steady-state value monitoring parameters is 2 times of the stable working time of the interference source equipment;

[0024] The minimum spectrum storage interval time of the power grid transient peak is the actual occurrence time of the power grid transient peak.

[0025] Further, when processing the data of each monitoring object in the daily processing mode, for the spectrum monitoring object, the amplitude values corresponding to all frequencies of the monitoring object data of each monitoring object per day are taken out, and the basic statistical data corresponding to each monitoring object are obtained, wherein the basic statistical data include the maximum amplitude value, the minimum amplitude value, the average amplitude value, the median amplitude value, and the corresponding working condition; for the time domain monitoring object, the waveform maximum value in the monitoring object data per day and the corresponding working condition are counted;

[0026] When processing the data of each monitoring object in the working condition processing mode, the spectrum of the monitoring object data in different working conditions is counted respectively.

[0027] When processing the data of each monitoring object in the time period processing mode, the spectrum of the monitoring object data in different time periods is counted respectively.

[0028] Further, the method for processing the data of each monitoring object in the mode of processing by mode is:

[0029] Step 31: define the mode step, wherein the mode step includes a small mode step, a medium mode step, and a large mode step, and the small mode step < the medium mode step < the large mode step;

[0030] Suppose that any frequency has the following group of amplitude values at different times:

[0031] Min, A1, A2,..., An, Max;

[0032] Starting from the minimum value Min, the defined mode step is used to divide the following amplitude space until the amplitude space containing the maximum value Max appears:

[0033] S1=(Min, Min+Step);

[0034] S2=(Min+Step, Min+2×Step);

[0035] Sm=(Min+(m-1)×Step, Min+m×Step);

[0036] Wherein, Step is the current mode step; S1~Sm is the amplitude space;

[0037] Step 32: under different mode steps, the mode values of each frequency are determined as follows:

[0038] Suppose that any frequency Fx has the following r amplitude values:

[0039] A1, A2,..., Ar-1, Ar;

[0040] According to the amplitude space determined in step 31, all amplitude values are respectively put into the corresponding amplitude space, the amplitude space containing the most amplitude values is taken as the mode space, and the average value of all amplitude values contained in the mode space is taken as the mode value under the frequency;

[0041] Step 33: After all frequencies are processed in the manner of step 32, a small mode spectrum, a medium mode spectrum and a large mode spectrum of the full frequency band are obtained, which are combined to form a mode spectrum.

[0042] Further, when the monitoring object data is an electric field frequency spectrum, the small mode step is set to 6dB, the medium mode step is set to 10dB, and the large mode step is set to 20dB;

[0043] When the monitoring object data is a magnetic field frequency spectrum, the small mode step is set to 3dB, the medium mode step is set to 6dB, and the large mode step is set to 10dB;

[0044] When the monitoring object data is an electric network frequency spectrum, the small mode step is set to 5dB, the medium mode step is set to 8dB, and the large mode step is set to 16dB.

[0045] Beneficial effects:

[0046] 1. The electromagnetic environment monitoring method for large module joint debugging provided by the application can effectively control the monitoring scale and enhance the engineering practicability of monitoring by determining the monitoring object and monitoring position in the module according to the characteristics of the interference source and the electromagnetic interference risk that it may cause.

[0047] 2. The electromagnetic environment monitoring method for large module joint debugging provided by the application can comprehensively and intuitively reflect the electromagnetic characteristics of the module by extracting the effective frequency spectrum features in the massive frequency spectrum data through the mode processing mode, and can analyze the electromagnetic compatibility risk of the module accordingly, thereby providing sufficient support for the overall electromagnetic compatibility evaluation. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The flowchart of the electromagnetic environment monitoring method for large module joint debugging provided by the application is provided.

[0049] Figure 2 The schematic diagram of the electromagnetic environment monitoring system provided by the application is provided. DETAILED DESCRIPTION

[0050] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0051] As shown in the figure, a large module joint debugging period electromagnetic environment monitoring method, comprising the following steps: Figure 1

[0052] Step 1: According to the interference characteristics of various electronic devices and electrical equipment in the to-be-tested module, the electronic devices and electrical equipment in the to-be-tested module that need to be monitored, the monitoring objects and monitoring parts are determined;

[0053] It should be noted that the module generally includes various electronic and electrical equipment, but due to the need for construction, there are generally more electrical equipment with large volume and high power. These devices are often electromagnetic interference sources and are easy to interfere with electronic devices. Therefore, the interference characteristics of electrical equipment are determined according to the characteristics of electrical equipment, and the corresponding monitoring objects and parts are determined according to the interference characteristics. Specifically, the electrical equipment includes power generation and transformation equipment; the electronic equipment includes frequency equipment and computer equipment;

[0054] 1) According to the interference source and interference path of the power generation and transformation equipment, the monitoring objects and monitoring parts of the power generation and transformation equipment are determined; wherein the monitoring objects of the power generation and transformation equipment include electric field, magnetic field and power grid; the monitoring parts of the power generation and transformation equipment include the power supply part itself, other power supply parts directly connected with the power supply part itself and power cables connected with the power supply part itself;

[0055] It should be noted that the main interference characteristics of the power generation and transformation equipment are low-frequency conducted interference characteristics, that is, the source of the interference comes from the power supply conversion module of the power generation and transformation equipment, which will cause obvious interference characteristics on the input / output power supply line. The interference will generally be transmitted to other power supply parts along the power supply cable, and the electromagnetic field near the power supply cable will also show obvious interference. Therefore, for the monitoring parts of such equipment, the power grid environment parameters of the power supply part and the other power supply parts connected therewith should be selected, and the electromagnetic field near the power cable should also be selected.

[0056] 3) According to the interference source of the frequency equipment, the monitoring objects and monitoring parts of the frequency equipment are determined; wherein the monitoring objects of the frequency equipment include electric field, magnetic field, power grid and cable coupling effect; the monitoring parts of the frequency equipment include the arrangement area of the frequency equipment, the analog cable and the signal cable used;

[0057] ​It should be noted that the use of specific frequency in the field of wireless communication and spectrum management, the use of frequency class electronic equipment, generally are susceptible to interference, such as interference may come from space electric field, magnetic field and signal cable on the induced electromagnetic field, also may come from the power grid with its working frequency overlap with the same frequency interference, therefore, the need to arrange the area of such equipment electric field, magnetic field and signal cable on the shielding layer induced current monitoring.

[0058] 4) according to the interference source of computer class equipment to determine the monitoring object of computer class equipment, monitoring site; wherein, the monitoring object of computer class equipment includes electric field, magnetic field; the monitoring site of computer class equipment is the power supply site of itself.

[0059] It should be noted that the general computer class electronic equipment, may also be disturbed, but because it has no typical working frequency, more often from the transient impulse interference from the power grid to cause its death, restart, black screen, etc., therefore, the need to monitor the power quality of its power supply site.

[0060] According to the above principles, the monitoring object and monitoring site are shown in table 1.

[0061] Table 1: monitoring object combing principle

[0062]

[0063] Note: 1) the general frequency band of electric field monitoring is 10 kHz-30 MHz; the general frequency band of magnetic field monitoring is 25 Hz-100 kHz;

[0064] 2) the monitoring frequency band of power grid environment is 25 Hz-30 MHz, usually including waveform distortion rate (single harmonic and total harmonic), power grid low frequency conducted emission (25 Hz-15 kHz), power grid radio frequency conducted emission (15 kHz-30 MHz), power grid transient peak (time domain waveform)

[0065] 3) the electromagnetic field monitoring near the use of frequency class electronic equipment should be matched with the sensor with its working frequency;

[0066] 4) the monitoring frequency band of cable environment / effect is generally 1 kHz-1 MHz.

[0067] Step 2: according to the need to monitor the electronic equipment, electrical equipment and its monitoring object, monitoring site to build monitoring system, and according to the type of monitoring object to determine the minimum frequency spectrum storage interval time of each monitoring object;

[0068] For example Figure 2As shown, the typical electromagnetic environment monitoring system is composed of a host computer, a (functional) monitoring unit (lower computer) and various functional sensors. The functional sensors collect analog signals to the monitoring units, which digitize the analog signals and then complete electromagnetic environment analysis according to the built-in software, and then upload to the (electromagnetic environment comprehensive monitoring) host computer through Ethernet for display, comprehensive monitoring, data storage, etc.

[0069] The selection of functional sensors can refer to the corresponding items in GJB151B and HJB237, or select sensors with the same type of parameters. For example:

[0070] 1) Magnetic field sensor: a receiving loop antenna (diameter 13.3 cm, 36 turns, DC resistance 5 Ω-10 Ω) can be selected;

[0071] 2) Electric field sensor: for example, a 104 cm rod antenna can be selected for the 10k-30MHz frequency band; a double cone antenna (top distance 137 cm) can be selected for the 30MHz-200MHz frequency band, or an integrated electric field antenna such as a near-field probe can also be selected.

[0072] 3) Power grid sensor generally includes power grid conducted interference sensor, spike sensor, etc. The power grid conducted interference sensor can select a resistance-capacitance sensor (0.25uF and 1kΩ in parallel, sampling 1kΩ), and the spike sensor can use a high-voltage differential voltage probe.

[0073] 4) Cable coupling effect sensor, generally select the current probe matched with the monitoring frequency band.

[0074] The selection of the above sensors can be adjusted according to the situation, but must be measured to obtain the required transfer parameters.

[0075] 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. Generally, it should 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.

[0076] Table 2 Frequency spectrum analysis bandwidth and resolution requirements

[0077]

[0078] It should be noted that the (electromagnetic environment comprehensive monitoring) host computer should at least have the following functions:

[0079] ①Comprehensive display of real-time frequency spectrum of each monitoring site;

[0080] ②Can store data of each monitoring item according to time information, and the data should at least include time, site, data, etc.

[0081] ③Data storage can be stored as a text file, directory is established according to monitoring items, subdirectory is established according to day under the directory, data file is stored under the subdirectory, and the data file is named with a time stamp;

[0082] ④The working condition information during module joint debugging can be recorded manually or automatically, and the working condition information at least includes starting time and working condition name;

[0083] ⑤The monitoring data can be played back according to time, position, item and the like.

[0084] Further, the present application can also adjust the field wiring and sensor position, and the arrangement requirements are as follows:

[0085] 1) The analog signal cable from the sensor to the unit must be kept at a distance of more than 1m from other cables in the module joint debugging site, if it cannot be avoided to be laid close to each other, a vertical mode can be used, and isolation can be achieved by strengthening shielding and the like;

[0086] 2) The Ethernet communication cable cannot be laid close to the high-power power cable in parallel, and at least a distance of more than 50cm should be kept;

[0087] 3) The sensor arrangement site must be well grounded, and the grounding resistance should be less than 5mΩ;

[0088] 4) When the magnetic field sensor is arranged, the following steps should be followed for adjustment;

[0089] 4a) Connect the magnetic field sensor with the spectrum analyzer, and keep it able to normally receive signals;

[0090] 4b) Arrange the magnetic field sensor in the vertical direction on the module site;

[0091] 4c) Start the equipment in the measured part area and work normally;

[0092] 4d) The spectrum analyzer records the amplitude corresponding to the characteristic frequency of the measured frequency band;

[0093] 4e) Change the direction of the magnetic field sensor, generally adjust by 90 degrees; repeat step 4d);

[0094] 4f) Determine the sensor direction corresponding to the maximum amplitude and fix it.

[0095] 5) If the electric field sensor uses a near-field probe or a similar directional antenna, the position adjustment should be referred to the magnetic field sensor;

[0096] 6) The power grid sensor is generally arranged near the measured distribution box. A socket is led out from the standby branch of the distribution box through a power supply line, and the power supply lead length should be less than 60cm. The sensor collects signals through a plug and the like.

[0097] 7) The cable environment sensor is generally arranged at a position 5-10 cm from the interface of the measured cable, the cable should be kept in the center position of the sensor and is padded by an insulating pad to keep insulation from the metal body.

[0098] Further, each monitoring object should be set with data monitoring and storage interval time according to the test working condition and requirements, and the method for the minimum spectrum storage interval time of each monitoring object is as follows:

[0099] 1) The monitoring purpose of the spectrum electromagnetic environment (such as magnetic field, electric field, power grid low frequency / radio frequency conducted emission, cable environment effect) is to monitor its steady-state properties, so it needs to be implemented after various interference source devices are in a stable working state. Generally, various interference source devices on the module are high-power devices, and it generally takes about 10-15s to stabilize the work. In order to ensure that the interference source device is completely in stable working state, the minimum spectrum storage interval time of the magnetic field, power grid low frequency / radio frequency conducted emission and cable coupling effect is generally selected as twice the stable working time of the interference source device as the minimum spectrum storage interval time, that is, 30s; the monitoring of the electric field is generally in the far field position, and a larger margin is needed to obtain better monitoring effect, so generally 4 times the stable working time, that is, 60s, is taken as the minimum spectrum storage interval time;

[0100] 2) Other steady-state value monitoring objects (such as voltage effective value, frequency, waveform distortion rate) generally reach stability quickly, usually 2-3 seconds, so according to the 2 times principle, the minimum spectrum storage interval time is generally selected as 5-6s;

[0101] 3) The power grid transient peak itself is a monitoring transient interference signal, and more reasonable trigger level is set, so there is no minimum spectrum storage interval time.

[0102] In summary, the typical monitoring parameters such as the frequency range and the minimum spectrum storage interval time of each item can be executed with reference to Table 3.

[0103] Table 3 Minimum storage interval time of each monitoring item

[0104]

[0105] Step 3: After the monitoring system runs for a set length of time, the data of each monitoring object stored according to the minimum spectrum storage interval time is processed in a day processing mode, a working condition processing mode, a time period processing mode or a mode of processing the most frequent value, and the electromagnetic environment monitoring of the measured module is completed.

[0106] That is, the present application can download the data files of each monitoring item on the host computer according to the electromagnetic compatibility evaluation needs, and perform statistical processing and analysis, and the typical analysis mode is as follows:

[0107] Mode one: daily processing mode.

[0108] When the daily processing mode is adopted to process the data of each monitoring object, for the spectrum type monitoring object, the amplitude values corresponding to all frequencies of the monitoring object data of each monitoring object per day are taken out, and the basic statistical data corresponding to each monitoring object are obtained, wherein the basic statistical data include the maximum amplitude value, the minimum amplitude value, the average amplitude value, the median amplitude value and the corresponding working condition; for the time domain type monitoring object, the waveform maximum value in the monitoring object data per day and the corresponding working condition are counted.

[0109] Mode two: working condition processing mode.

[0110] When the working condition processing mode is adopted to process the data of each monitoring object, the frequency spectrum of the monitoring object data under different working conditions is counted respectively.

[0111] Mode three: time period processing mode.

[0112] 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.

[0113] Mode four: mode of processing by mode.

[0114] It should be noted that the frequency spectrum measurement result is a two-dimensional array of frequency-amplitude, and the monitoring data has an additional dimension, i.e. time. The amplitudes corresponding to the same frequency at different times will differ, and sometimes there is no completely equivalent amplitude. Therefore, the range (space) needs to be defined first. Generally, the small crowd sets a range of 3dB, the medium crowd sets a range of 6dB, and the large crowd sets a range of 10dB. 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:

[0115] Step 31: define the mode step, wherein the mode step includes a small crowd step, a medium crowd step and a large crowd step, and the small crowd step < the medium crowd step < the large crowd step;

[0116] Suppose that there is the following group of amplitudes at different times for any frequency:

[0117] Min, A1, A2,..., An, Max;

[0118] Starting from the minimum value Min, the defined mode step is used to divide the following amplitude space until the amplitude space containing the maximum value Max appears:

[0119] S1= (Min, Min+Step);

[0120] S2 = (Min + Step, Min + 2*Step);

[0121] Sm = (Min + (m-1)*Step, Min + m*Step);

[0122] wherein Step is the current mode step; S1-Sm is the amplitude space;

[0123] When the monitoring object data is electric field spectrum, the small mode step is set as 6dB, the medium mode step is set as 10dB, and the large mode step is set as 20dB; when the monitoring object data is magnetic field spectrum, the small mode step is set as 3dB, the medium mode step is set as 6dB, and the large mode step is set as 10dB; when the monitoring object data is electric network spectrum, the small mode step is set as 5dB, the medium mode step is set as 8dB, and the large mode step is set as 16dB.

[0124] Step 32: under different mode steps, the mode values of each frequency are determined in the following manner respectively:

[0125] Suppose that there are r amplitude values of any frequency Fx as follows:

[0126] A1, A2,..., Ar-1, Ar;

[0127] According to the amplitude space determined in step 31, all the amplitude values are respectively put into the corresponding amplitude space, the amplitude space containing the most amplitude values is taken as the mode space, and the average value of all the amplitude values contained in the mode space is taken as the mode value of the frequency;

[0128] Step 33: after all the frequencies are processed in the manner of step 32, a set of small mode spectrum, medium mode spectrum and large mode spectrum of the whole frequency band is obtained, which are combined to form the mode spectrum.

[0129] Thus, by applying the present application, the electromagnetic environment monitoring in the module joint debugging stage can be realized, and data support for overall electromagnetic compatibility evaluation is provided.

[0130] According to the content disclosed in the present application, the skilled in the art can realize the specific electromagnetic environment monitoring in the module joint debugging stage in other similar manners, which are not limited to Figure 1 and Figure 2 the manners shown in the drawings.

[0131] Of course, the present application can have other various embodiments, and the skilled in the art can certainly make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications shall all belong to the protection scope of the claims attached to the present application.

Claims

1. A method for monitoring electromagnetic environment during large module integration test, characterized in that, The method comprises the following steps: Step 1: determining the electronic equipment and electrical equipment to be monitored in the to-be-tested module, the monitoring objects and monitoring positions of the electronic equipment and electrical equipment according to the interference characteristics of various electronic equipment and electrical equipment in the to-be-tested module; Step 2: building a monitoring system according to the electronic equipment and electrical equipment to be monitored and the monitoring objects and monitoring positions of the electronic equipment and electrical equipment, and determining the minimum spectrum storage interval time of each monitoring object according to the type of the monitoring object; The method for determining the minimum spectrum storage interval time of each monitoring object according to the type of the monitoring object is as follows: The monitoring objects include spectrum electromagnetic environment parameters, steady-state value monitoring parameters and power grid transient peak, wherein the spectrum electromagnetic environment parameters include magnetic field, electric field, power grid low frequency / radio frequency conducted emission and cable coupling effect; the steady-state value monitoring parameters include voltage effective value, frequency and waveform distortion rate; The minimum spectrum storage interval time of the magnetic field, power grid low frequency / radio frequency conducted emission and cable coupling effect is 2 times the stable working time of the interference source equipment; The minimum spectrum storage interval time of the electric field is 4 times the stable working time of the interference source equipment; The minimum spectrum storage interval time of the steady-state value monitoring parameters is 2 times the stable working time of the interference source equipment; The minimum spectrum storage interval time of the power grid transient peak is the actual occurrence time of the power grid transient peak; Step 3: after the monitoring system runs for a set time length, storing the monitoring object data of each monitoring object according to the minimum spectrum storage interval time, and processing the monitoring object data of each monitoring object by using a day-by-day processing mode, a working condition-by-working condition processing mode, a time period-by-time period processing mode or a mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of 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processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing by mode of processing ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Step 33: After all the frequencies are processed in the manner of step 32, a set of small crowd spectrum, medium crowd spectrum and large crowd spectrum of the full frequency band is obtained, which constitutes the crowd spectrum.

2. The method of claim 1, wherein the method further comprises: The electrical equipment includes power generation and transformation equipment; the electronic equipment includes frequency using equipment and computer equipment; The monitoring object and monitoring part of the power generation and transformation equipment are determined according to the interference source and interference path of the power generation and transformation equipment; wherein the monitoring object of the power generation and transformation equipment includes electric field, magnetic field and power grid; the monitoring part of the power generation and transformation equipment includes the power supply part itself, other power supply parts directly connected with the power supply part itself and power cables connected with the power supply part itself; The monitoring object and monitoring part of the frequency using equipment are determined according to the interference source of the frequency using equipment; wherein the monitoring object of the frequency using equipment includes electric field, magnetic field, power grid and cable coupling effect; the monitoring part of the frequency using equipment includes the arrangement area of the frequency using equipment, analog cable and signal cable used by the frequency using equipment; The monitoring object and monitoring part of the computer equipment are determined according to the interference source of the computer equipment; wherein the monitoring object of the computer equipment includes electric field and magnetic field; the monitoring part of the computer equipment is the power supply part itself.

3. The method of claim 2, wherein the method further comprises: The monitoring frequency band of the electric field is 10 kHz-30 MHz; the monitoring frequency band of the cable coupling effect is 1 kHz-1 MHz; the monitoring frequency band of the magnetic field is 25 Hz-100 kHz; the monitoring frequency band of the power grid environment is 25 Hz-30 MHz; wherein the monitoring frequency band of the magnetic field of the frequency using equipment is comparable to the order of magnitude of the working frequency of the frequency using equipment.

4. The method of claim 1, wherein the method further comprises: The monitoring system includes a host computer, various functional monitoring units and various functional sensors; The various functional monitoring units include electric field monitoring unit, magnetic field monitoring unit, power grid monitoring unit and cable coupling effect monitoring unit connected with the host computer; at the same time, the electric field monitoring unit is connected with a plurality of electric field sensors arranged in different monitoring parts; the magnetic field monitoring unit is connected with a plurality of magnetic field sensors arranged in different monitoring parts; the power grid monitoring unit is connected with a plurality of power grid sensors arranged in different monitoring parts; the cable coupling effect monitoring unit is connected with a plurality of cable coupling effect sensors arranged in different monitoring parts.

5. The method of claim 4, wherein the method further comprises: The host computer is used to display the real-time frequency spectrum of each monitoring part; is also used to store the data of each monitoring object according to time information respectively, and the monitoring object data should at least include storage time, monitoring part and numerical value; is also used to store the monitoring object data as a text file, and establish a directory according to the monitoring object, establish a subdirectory according to day under the directory, and store data files under the subdirectory, and the data files are named with time stamp; is also used to automatically record the working condition information during the module joint debugging to be tested, and the working condition information at least includes starting time and working condition name; is also used to play back the monitoring object data according to time, monitoring part and monitoring object.

6. The method of claim 4, wherein the method further comprises: The spacing between the signal cable of the sensor of various functions and the cable of the monitoring unit of various functions is at least 1 m, for the cable which cannot keep the spacing of at least 1 m, the perpendicular way is arranged between each other; the Ethernet communication cable cannot be laid parallel with the high-power power cable, and at least keeps above 50 cm; the grounding resistance of the sensor of various functions is less than 5 mΩ; the power grid sensor is arranged near the measured distribution box; the cable coupling effect sensor is arranged at the position of 5-10 cm of the measured cable interface.

7. The electromagnetic environment monitoring method during large-scale module commissioning as described in claim 1, characterized in that, When the data of each monitoring object is processed by the day processing mode, for the spectrum type monitoring object, the amplitude corresponding to all frequencies of the monitoring object data of each monitoring object per day is taken out, and the corresponding basic statistical data of each monitoring object is obtained, wherein the basic statistical data includes the maximum value, the minimum value, the average value, the median value of the amplitude and the corresponding working condition; for the time domain type monitoring object, the waveform maximum value in the monitoring object data of each monitoring object per day and the corresponding working condition are counted; When the data of each monitoring object is processed by the working condition processing mode, the spectrum of the monitoring object data under different working conditions is counted respectively; When the data of each monitoring object is processed by the time period processing mode, the spectrum of the monitoring object data in different time periods is counted respectively.

8. The method of claim 1, wherein the method further comprises: monitoring the electromagnetic environment of the large module during the integration test. When the monitoring object data is electric field spectrum, the small step size is set to 6 dB, the medium step size is set to 10 dB, and the large step size is set to 20 dB; ​ When the monitoring object data is magnetic field spectrum, the small step size is set to 3 dB, the medium step size is set to 6 dB, and the large step size is set to 10 dB; When the monitoring object data is power grid spectrum, the small step size is set to 5 dB, the medium step size is set to 8 dB, and the large step size is set to 16 dB.

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