CN111638474B - Vehicle electromagnetic exposure measurement method and device and computer equipment - Google Patents
Vehicle electromagnetic exposure measurement method and device and computer equipment Download PDFInfo
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- CN111638474B CN111638474B CN202010612096.2A CN202010612096A CN111638474B CN 111638474 B CN111638474 B CN 111638474B CN 202010612096 A CN202010612096 A CN 202010612096A CN 111638474 B CN111638474 B CN 111638474B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/0206—Three-component magnetometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/10—Plotting field distribution ; Measuring field distribution
Abstract
The invention provides a vehicle electromagnetic exposure measuring method, a device and computer equipment, wherein the vehicle electromagnetic exposure measuring method comprises the following steps: acquiring a magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle; generating a weighted digital filter according to a standard magnetic field limit curve to be subjected to electromagnetic exposure evaluation; and calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by utilizing the weighted digital filter, the magnetic field signal and a preset algorithm. According to the vehicle electromagnetic exposure measurement method, the magnetic field signals can be acquired by utilizing the plurality of magnetic field measurement probes so as to improve the efficiency of vehicle human electromagnetic exposure measurement, so that the measurement result is more visual, and the measurement precision is improved.
Description
Technical Field
The invention relates to the field of electromagnetic safety, in particular to a vehicle electromagnetic exposure measuring method, a vehicle electromagnetic exposure measuring device, computer equipment and a readable storage medium.
Background
The existing vehicle electromagnetic exposure measurement generally adopts a single magnetic field probe to carry out alternate measurement at each position, the frequency resolution of the used magnetic field probe is fixed, and the magnetic field probe with different frequency resolutions needs to be replaced to meet the measurement requirement when the vehicle electromagnetic exposure measurement faces to the measurement of different frequency bands, so the vehicle electromagnetic exposure measurement precision is lower, and the measurement result is not very intuitive.
Disclosure of Invention
In view of the above problems, the present invention provides a vehicle electromagnetic exposure measurement method, apparatus, computer device and readable storage medium, so as to make the measurement result more intuitive and improve the measurement accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vehicle electromagnetic exposure measurement method, comprising:
acquiring a magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle;
generating a weighted digital filter according to a standard magnetic field limit curve to be subjected to electromagnetic exposure evaluation;
and calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by utilizing the weighted digital filter, the magnetic field signal and a preset algorithm.
Preferably, the method for measuring electromagnetic exposure of a vehicle further includes:
performing fast Fourier transform processing on the magnetic field signal to obtain an original frequency spectrum of the at least one preset position;
and carrying out spectrum analysis on the original spectrum according to a preset rule to obtain an omnidirectional spectrum field intensity curve of a corresponding preset position in the vehicle.
Preferably, in the method for measuring electromagnetic exposure of a vehicle, the magnetic field measurement probe is a triaxial magnetic field measurement probe, and the original frequency spectrum is a triaxial original frequency spectrum.
Preferably, in the method for measuring electromagnetic exposure of a vehicle, the calculating, by using the weighted digital filter, the magnetic field signal and a preset algorithm, a ratio of the magnetic field exposure at a corresponding preset position in the vehicle to a standard magnetic field limit value includes:
inputting the magnetic field signal to the weighting digital filter to obtain a time domain response curve output by the weighting digital filter;
performing integral operation processing on the time domain response curve to obtain an integral result;
and multiplying the integration result by the antenna coefficient of the magnetic field measuring probe to obtain the proportion of the magnetic field exposure at the corresponding preset position relative to the standard magnetic field limit value.
Preferably, in the method for measuring electromagnetic exposure of a vehicle, the performing spectrum analysis on the original spectrum according to a preset rule to obtain an omnidirectional spectrum field strength curve of a corresponding preset position in the vehicle includes:
carrying out segmentation processing on the original frequency spectrum according to a preset frequency point;
carrying out frequency sampling processing on the original frequency spectrum subjected to the segmentation processing by using a corresponding frequency sampling algorithm to obtain a sampled frequency spectrum;
and multiplying the sampled frequency spectrum by the antenna coefficient of the magnetic field measuring probe to obtain the omnidirectional frequency spectrum field intensity curve.
Preferably, in the method for measuring the electromagnetic exposure of the vehicle, the preset frequency points include a 10Hz frequency point, a 5kHz frequency point, a 50kHz frequency point and a 400kHz frequency point, and the original frequency spectrum after the segmentation processing includes a 10 Hz-5 kHz frequency band frequency spectrum, a 5 kHz-50 kHz frequency band frequency spectrum and a 50 kHz-400 kHz frequency band frequency spectrum; the frequency sampling algorithm comprises a root mean square value algorithm of a preset frequency point number;
the frequency sampling processing of the original frequency spectrum after the segmentation processing by using a corresponding frequency sampling algorithm comprises the following steps:
root mean square value operation is carried out on every 5 frequency points of an original frequency spectrum of the 5 kHz-50 kHz frequency band, and the amplitude of each frequency point in the 5 kHz-50 kHz frequency band after sampling is obtained;
and performing root mean square value operation on every 50 frequency points of the original frequency spectrum in the frequency band of 50 kHz-400 kHz to obtain the amplitude of every frequency point in the frequency band of 50 kHz-400 kHz after sampling.
Preferably, in the method for measuring electromagnetic exposure of a vehicle, the magnetic field measuring probe includes three orthogonal energized coils for measuring an X-axis component magnetic field, a Y-axis component magnetic field, and a Z-axis component magnetic field in a space.
The present invention also provides a vehicle electromagnetic exposure measuring device, including:
the magnetic field signal acquisition module is used for acquiring a triaxial magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle;
The filter generation module is used for generating a weighting digital filter according to a standard limit curve of vehicle electromagnetism;
and the limit ratio generating module is used for calculating and obtaining the ratio of the electromagnetic exposure of the corresponding preset position in the vehicle relative to a standard electromagnetic limit by utilizing the weighting digital filter, the three-axis magnetic field signal and a preset algorithm.
The invention also provides computer equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor runs the computer program to enable the computer equipment to execute the vehicle electromagnetic exposure measurement method.
The invention also provides a readable storage medium, which stores a computer program that, when run on a processor, performs the vehicle electromagnetic exposure measurement method.
The invention provides a vehicle electromagnetic exposure measuring method, which comprises the following steps: acquiring a magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle; generating a weighting digital filter according to a standard magnetic field limit curve to be subjected to electromagnetic exposure evaluation; and calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by utilizing the weighted digital filter, the magnetic field signal and a preset algorithm. According to the vehicle electromagnetic exposure measurement method, a plurality of magnetic field measurement probes can be used for acquiring magnetic field signals so as to improve the efficiency of human electromagnetic exposure measurement, so that the measurement result is more visual, and the measurement precision is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a flowchart of a vehicle electromagnetic exposure measurement method provided in embodiment 1 of the present invention;
FIG. 2 is a flow chart for calculating a ratio of electromagnetic exposure to standard electromagnetic limits provided by embodiment 1 of the present invention;
fig. 3 is a flowchart of a vehicle electromagnetic exposure measurement method provided by embodiment 2 of the invention;
fig. 4 is a flowchart of a spectrum analysis process provided in embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a vehicle electromagnetic exposure measuring device provided in embodiment 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are intended to indicate only specific features, numerals, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the presence of or adding to one or more other features, numerals, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
Fig. 1 is a flowchart of a vehicle electromagnetic exposure measurement method according to embodiment 1 of the present invention, where the method includes the following steps:
step S11: magnetic field signals of at least one magnetic field measuring probe at a preset position in the vehicle are acquired.
In the embodiment of the invention, for the requirement of measuring the electromagnetic environment of the vehicle, 1, 4 or 7 magnetic field measuring probes are generally arranged on a seat in the vehicle, and the arranged positions comprise single test points of the head, the back and the hip of the seat and 4 test points of the feet. The best scheme of the application is that 7 magnetic field measuring probes are arranged, and data of the 7 magnetic field measuring probes are received at the same time to detect the electromagnetic exposure, so that the detection efficiency is improved.
In the embodiment of the invention, the magnetic field measuring probe comprises three orthogonal electrified coils and is used for measuring an X-axis component magnetic field, a Y-axis component magnetic field and a Z-axis component magnetic field in a space. The magnetic field signal acquired by the electrified coil can be received by the data acquisition instrument, and the data acquisition instrument can send the magnetic field signal to the computer equipment for electromagnetic detection after receiving the magnetic field signal of the electrified coil, so that the computer equipment can analyze and process the magnetic field signal. Each electrified coil of the magnetic field measuring probe needs to receive data by using one channel, so that a data acquisition instrument with a large number of channels can be preferably used for receiving the data, and the multi-channel data acquisition instrument can collect and transmit the magnetic field signals of each electrified coil to computer equipment after receiving the magnetic field signals so as to reduce the number of connecting wires required by the direct connection of the computer equipment to the magnetic field measuring probe.
In the embodiment of the invention, the computer equipment can also be provided with a positioning module, the positioning module is used for acquiring longitude and latitude information, speed information and acceleration information corresponding to the vehicle while receiving the magnetic field signal acquired by the magnetic field measuring probe, and the longitude and latitude information, the speed information and the acceleration information are stored in association with the magnetic field signal and the processed magnetic field signal, so that the position information, the speed information and the acceleration information related to the vehicle can be known when the frequency spectrum analysis display and the data playback are carried out, and a user can know the influence factors corresponding to the electromagnetic exposure and find out the corresponding coping scheme.
Step S12: a weighted digital filter is generated based on a standard magnetic field limit curve to be evaluated for electromagnetic exposure.
In the embodiment of the invention, the computer equipment comprises a weighting module of the magnetic field signal, the weighting module can calculate the proportion of the electromagnetic exposure of the corresponding preset position relative to the standard electromagnetic limit value, namely, whether the electromagnetic exposure exceeds the limit value can be determined according to the proportion, and when the proportion is greater than the preset value, the human electromagnetic exposure of the position can be proved to exceed the limit value, so that the subsequent search for an improved method is facilitated. The standard limit curve is based on the human body electromagnetic exposure measurement standard, for example, taking the human body electromagnetic exposure measurement standard GB8702-2014 as an example, the exposure limit frequency response curve is:
V(f)＝BRL(f)；
when f is more than or equal to 1Hz and less than or equal to 8Hz, BRL(f)＝40000/f2(μT)；
When f is more than or equal to 8Hz and less than or equal to 1200Hz, BRL(f)＝5000/f(μT)；
When f is more than or equal to 1200Hz and less than or equal to 2900Hz, BRL(f)＝4.1μT；
When f is more than or equal to 2900Hz and less than or equal to 100000Hz, BRL(f)＝12000/f(μT)。
In the exposure limit frequency response curve, the magnetic induction intensity control limit value is in a descending trend along with the increase of the frequency, and is inversely proportional to the square of the frequency in the frequency range of 1Hz-8Hz, and is inversely proportional to the frequency in the frequency ranges of 8Hz-1.2kHz and 2.9kHz-100 kHz. If the generated weighted digital filter is an IIR digital filter, the frequency response curve of the IIR digital filter is 1/B RL(f) .1. the Wherein the standard limit curve can be input by the user or adjusted to obtain the desired weighted digital filter.
Step S13: and calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by utilizing the weighted digital filter, the magnetic field signal and a preset algorithm.
In the embodiment of the present invention, in the weighting mode, the weighting digital filter, the magnetic field signal and the preset algorithm are used to calculate the ratio of the electromagnetic exposure at the corresponding preset position relative to the standard electromagnetic limit, and this process may be implemented by using an application program, for example, a ratio calculation application program may be provided in the computer device, and the application program may generate the weighting digital filter according to the standard limit curve and perform calculation of the ratio of the electromagnetic exposure at the corresponding preset position relative to the standard electromagnetic limit, which is not limited herein.
In the embodiment of the invention, the magnetic field signal is directly input to the weighting digital filter, the proportion of the electromagnetic exposure relative to the standard electromagnetic limit value is calculated by using a preset algorithm, and the Fourier transform and the frequency spectrum analysis operation can be carried out while the proportion is calculated, so that the weighting and frequency spectrum analysis efficiency is improved. The weighting result and the frequency spectrum analysis result can be displayed in the computer device at the same time, so that the user can visually analyze and observe the electromagnetic exposure.
Fig. 2 is a flowchart for calculating a ratio of electromagnetic exposure to a standard electromagnetic limit according to embodiment 1 of the present invention, including the following steps:
step S21: and inputting the magnetic field signal to the weighting digital filter to obtain a time domain response curve output by the weighting digital filter.
Step S32: and performing integral operation processing on the time domain response curve to obtain an integral result.
Step S33: and multiplying the integration result by the antenna coefficient of the magnetic field measuring probe to obtain the proportion of the magnetic field exposure at the corresponding preset position relative to the standard magnetic field limit value.
In the embodiment of the present invention, the integration processing procedure and the antenna coefficient multiplication procedure may be implemented by an algorithm or an application program, and for example, the application program for performing the integration operation and the antenna coefficient multiplication operation may be stored in a computer device in advance. The antenna coefficients may also be designed in a weighted digital filter, through which the time domain response curve may be multiplied by the antenna coefficients, without limitation.
Example 2
Fig. 3 is a flowchart of a vehicle electromagnetic exposure measurement method according to embodiment 2 of the present invention, where the method includes the following steps:
Step S31: magnetic field signals of at least one magnetic field measuring probe at a preset position in the vehicle are obtained.
This step is identical to the step S11, and will not be described herein again.
Step S32: a weighted digital filter is generated based on a standard magnetic field limit curve to be evaluated for electromagnetic exposure.
This step is identical to step S12 described above, and will not be described herein again.
Step S33: and calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by utilizing the weighted digital filter, the magnetic field signal and a preset algorithm.
This step is identical to step S13 described above, and will not be described herein again.
Step S34: and carrying out fast Fourier transform processing on the magnetic field signal to obtain an original frequency spectrum of the at least one preset position.
In the embodiment of the invention, the magnetic field measuring probe is a triaxial magnetic field measuring probe, and the original frequency spectrum is a triaxial original frequency spectrum. And the computer equipment performs fast Fourier transform on the acquired magnetic field signal so as to acquire the three-axis original frequency spectrum of the magnetic field measuring probe at the corresponding position. The three-axis original frequency spectrum comprises an original frequency spectrum of an X-axis, an original frequency spectrum of a Y-axis and an original frequency spectrum of a Z-axis in a space. An application program for performing fast fourier transform may be stored in the computer device in advance, and the obtained magnetic field signal may be input to the application program, and the original frequency spectrum of each axis may be output after the fast fourier transform of the application program.
Step S35: and carrying out spectrum analysis on the original spectrum according to a preset rule to obtain an omnidirectional spectrum field intensity curve of a corresponding preset position in the vehicle.
In the embodiment of the invention, after the three-axis original frequency spectrum is obtained, frequency spectrum analysis is carried out according to the preset rule, and the frequency spectrum field intensity curve of each axis, namely the omnidirectional frequency spectrum field intensity curve of the corresponding preset position in the vehicle, is obtained. The sampling rate of the magnetic field measuring probe can be controlled to be 1MS/s, the sampling time is 1.048s, and the unit of the acquired magnetic field signal is mV (millivolt).
The frequency resolution of frequency domain measurement is specified in the human body electromagnetic exposure measurement standard GB/T37130-2018, the frequency resolution is required to be less than or equal to 1Hz below 5kHz, less than or equal to 5Hz between 5kHz and 50Hz between 50kHz and 400kHz, and in order to meet the GB/T37130-2018 standard of electromagnetic exposure measurement, the frequency spectrum analysis of a preset rule comprises a frequency sampling process, for example, according to the sampling rate and the sampling duration of the magnetic field measurement probe, for a frequency band between 5kHz and 50kHz, the frequency resolution is reduced according to the proportion of 5:1, and for a frequency band between 50kHz and 400kHz, the frequency resolution is reduced according to the proportion of 50: 1. After frequency sampling treatment, the frequency range is 10Hz-5kHz, and the frequency resolution is 0.954 Hz; the frequency resolution of the frequency band of 5kHz-50kHz is 4.768Hz, and the frequency resolution of the frequency band of 50kHz-400kHz is 47.684Hz, thereby meeting the standard requirement. The scale reduction of each frequency band is set based on the sampling rate and the sampling duration of the magnetic field measurement probe, and therefore the scale of the reduction of each frequency band is not limited.
In the embodiment of the present invention, the process of performing spectrum analysis according to the preset rule may be implemented by using an application program, for example, a spectrum analysis application program based on the preset rule may be stored in advance in a computer device, and the obtained three-axis original spectrum is input into the application program to perform frequency sampling processing. After the frequency spectrum analysis, an omnidirectional frequency spectrum field intensity curve is obtained, namely a relation curve of the human body electromagnetic exposure amount and the frequency of the corresponding position in the vehicle, and whether the electromagnetic exposure at the preset position exceeds a limit value or not can be conveniently judged by utilizing the omnidirectional frequency spectrum field intensity curve, so that the measurement precision is improved. And the efficiency of the electromagnetic exposure measurement of the human body can be improved by utilizing a plurality of magnetic field measuring probes to obtain magnetic field signals.
Example 3
Fig. 4 is a flowchart of a spectrum analysis process provided in embodiment 3 of the present invention, including the following steps:
step S41: and carrying out segmentation processing on the original frequency spectrum according to a preset frequency point.
In the embodiment of the invention, the preset frequency points comprise a 10Hz frequency point, a 5kHz frequency point, a 50kHz frequency point and a 400kHz frequency point, and the original frequency spectrum after segmentation treatment comprises a 10 Hz-5 kHz frequency band frequency spectrum, a 5 kHz-50 kHz frequency band frequency spectrum and a 50 kHz-400 kHz frequency band frequency spectrum. The frequency points and the segments are based on the human body electromagnetic exposure measurement standard GB/T37130-2018, if a new standard exists and new requirements are made on the frequency points and the segments, the segmentation processing processes are similar, the method is also applicable to the existing human body electromagnetic exposure measurement standard, and the method is not limited here.
Step S42: and carrying out frequency sampling treatment on the original frequency spectrum subjected to the segmentation treatment by using a corresponding frequency sampling algorithm to obtain a sampled frequency spectrum.
In the embodiment of the present invention, the frequency sampling process includes: performing root mean square value operation on every 5 frequency points of an original frequency spectrum of a 5kHz-50kHz frequency band to obtain the amplitude of each frequency point in the 5kHz-50kHz frequency band after sampling; and performing root mean square value operation on every 50 frequency points of the original frequency spectrum in the frequency band of 50kHz-400kHz to obtain the amplitude of every frequency point in the frequency band of 50kHz-400kHz after sampling. I.e. a scale of 5:1 for the frequency band 5kHz to 50kHz, and a scale of 50:1 for the frequency band 50kHz to 400 kHz. The frequency point number of the rms value operation of each frequency band is set based on the sampling rate and the sampling duration of the magnetic field measuring probe, and is not limited.
Step S43: and multiplying the sampled frequency spectrum by the antenna coefficient of the magnetic field measuring probe to obtain the omnidirectional frequency spectrum field intensity curve.
Example 4
Fig. 5 is a schematic structural diagram of a vehicle electromagnetic exposure measuring device provided in embodiment 4 of the present invention.
The vehicle electromagnetic exposure measurement apparatus 500 includes:
A magnetic field signal acquiring module 510, configured to acquire a magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle;
a filter generation module 520, configured to generate a weighted digital filter according to a standard magnetic field limit curve to be evaluated for electromagnetic exposure;
a limit ratio generating module 530, configured to calculate and obtain a ratio of the magnetic field exposure at the corresponding preset position in the vehicle relative to a standard magnetic field limit by using the weighted digital filter, the magnetic field signal, and a preset algorithm.
In the embodiment of the present invention, for more detailed description of functions of the above modules, reference may be made to contents of corresponding parts in the foregoing embodiment, which are not described again here.
In addition, the invention also provides a computer device, which comprises a memory and a processor, wherein the memory can be used for storing a computer program, and the processor can execute the computer program so as to enable the computer device to execute the functions of each module in the method or the vehicle electromagnetic exposure measuring device.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the computer device, etc. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The present embodiment also provides a computer storage medium for storing a computer program used in the above computer apparatus.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention or a part thereof which contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A vehicle electromagnetic exposure measurement method, comprising:
acquiring a magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle;
generating a weighting digital filter according to a standard magnetic field limit curve to be subjected to electromagnetic exposure evaluation;
calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to a standard magnetic field limit value by utilizing the weighting digital filter, the magnetic field signal and a preset algorithm;
the calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by using the weighted digital filter, the magnetic field signal and a preset algorithm comprises:
inputting the magnetic field signal to the weighting digital filter to obtain a time domain response curve output by the weighting digital filter;
Performing integral operation processing on the time domain response curve to obtain an integral result;
and multiplying the integration result by the antenna coefficient of the magnetic field measuring probe to obtain the proportion of the magnetic field exposure at the corresponding preset position relative to the standard magnetic field limit value.
2. The vehicle electromagnetic exposure measurement method according to claim 1, further comprising:
performing fast Fourier transform processing on the magnetic field signal to obtain an original frequency spectrum of the at least one preset position;
and carrying out spectrum analysis on the original spectrum according to a preset rule to obtain an omnidirectional spectrum field intensity curve of a corresponding preset position in the vehicle.
3. The vehicle electromagnetic exposure measurement method of claim 2, wherein the magnetic field measurement probe is a triaxial magnetic field measurement probe and the raw spectra are triaxial raw spectra.
4. The vehicle electromagnetic exposure measurement method of claim 2, wherein the performing spectral analysis on the original spectrum according to a preset rule to obtain an omnidirectional spectrum field strength curve of a corresponding preset position in the vehicle comprises:
carrying out segmentation processing on the original frequency spectrum according to preset frequency points;
carrying out frequency sampling processing on the original frequency spectrum subjected to the segmentation processing by using a corresponding frequency sampling algorithm to obtain a sampled frequency spectrum;
And multiplying the sampled frequency spectrum by the antenna coefficient of the magnetic field measuring probe to obtain the omnidirectional frequency spectrum field intensity curve.
5. The vehicle electromagnetic exposure measurement method according to claim 4, wherein the preset frequency points include a 10Hz frequency point, a 5kHz frequency point, a 50kHz frequency point and a 400kHz frequency point, and the original frequency spectrum after the segmentation processing includes a 10 Hz-5 kHz frequency band frequency spectrum, a 5 kHz-50 kHz frequency band frequency spectrum and a 50 kHz-400 kHz frequency band frequency spectrum; the frequency sampling algorithm comprises a root mean square value algorithm of a preset frequency point number;
the frequency sampling processing of the original frequency spectrum after the segmentation processing by using a corresponding frequency sampling algorithm comprises the following steps:
root mean square value operation is carried out on every 5 frequency points of an original frequency spectrum of the 5 kHz-50 kHz frequency band, and the amplitude of each frequency point in the 5 kHz-50 kHz frequency band after sampling is obtained;
and carrying out root mean square value operation on each 50 frequency points of the original frequency spectrum in the frequency range of 50 kHz-400 kHz to obtain the amplitude of each frequency point in the frequency range of 50 kHz-400 kHz after sampling.
6. The vehicle electromagnetic exposure measurement method of claim 1, wherein the magnetic field measurement probe includes three orthogonal energized coils for measuring an X-axis component magnetic field, a Y-axis component magnetic field, and a Z-axis component magnetic field in space.
7. A vehicle electromagnetic exposure measurement device, comprising:
the magnetic field signal acquisition module is used for acquiring a triaxial magnetic field signal of a magnetic field measuring probe at least one preset position in a vehicle;
the filter generation module is used for generating a weighting digital filter according to a standard limit curve of vehicle electromagnetism;
the limit ratio generation module is used for calculating and obtaining the ratio of the electromagnetic exposure of a corresponding preset position in the vehicle relative to a standard electromagnetic limit by using the weighted digital filter, the three-axis magnetic field signal and a preset algorithm;
the calculating and obtaining the proportion of the magnetic field exposure of the corresponding preset position in the vehicle relative to the standard magnetic field limit value by using the weighted digital filter, the magnetic field signal and a preset algorithm comprises:
inputting the magnetic field signal to the weighting digital filter to obtain a time domain response curve output by the weighting digital filter;
performing integral operation processing on the time domain response curve to obtain an integral result;
and multiplying the integration result by the antenna coefficient of the magnetic field measuring probe to obtain the proportion of the magnetic field exposure at the corresponding preset position relative to the standard magnetic field limit value.
8. A computer arrangement comprising a memory storing a computer program and a processor executing the computer program to cause the computer arrangement to perform the vehicle electromagnetic exposure measurement method of any one of claims 1 to 6.
9. A readable storage medium, characterized in that it stores a computer program which, when run on a processor, performs the vehicle electromagnetic exposure measurement method of any one of claims 1 to 6.
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