CN113311258A - Semi-anechoic chamber device and electromagnetic compatibility EMC (electro magnetic compatibility) test method - Google Patents
Semi-anechoic chamber device and electromagnetic compatibility EMC (electro magnetic compatibility) test method Download PDFInfo
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Abstract
The invention belongs to the technical field of electromagnetic compatibility, and discloses a semi-anechoic chamber device and an electromagnetic compatibility EMC test method, wherein the semi-anechoic chamber device comprises: the device comprises a signal generation module, a signal acquisition module, a signal preprocessing module, a signal transmission module, a central control module, a signal conversion module, an EMC test module, an evaluation module, a data storage module and an updating display module. According to the semi-anechoic chamber device, the collected electromagnetic wave signals are processed through the signal preprocessing module, the type of the input signals is judged by adopting a multi-node cooperative processing method, and the accuracy of signal classification is improved; the half anechoic chamber device is subjected to electromagnetic compatibility EMC test by the EMC test module through electromagnetic compatibility test equipment, and the field uniformity of the half anechoic chambers with different sizes can be tested, so that the result is more accurate and reliable, the test efficiency is improved, and the test cost and the production cost are effectively reduced.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility, and particularly relates to a semi-anechoic chamber device and an electromagnetic compatibility (EMC) test method.
Background
At present, with the wide application and development of radio technology, various radio devices are emerging, so that the interference between the devices is more and more serious. Meanwhile, the integration of the system is higher and higher as the electronic technology and the computer technology are continuously improved, the frequency band of the electronic equipment is widened increasingly, the sensitivity is improved, and the cable network among the equipment is more and more complex, so that the anti-interference performance of the equipment must be evaluated in order to enable the equipment to work normally, and the radiation anti-interference performance experiment of an electromagnetic field needs to be carried out on the equipment. The semi-anechoic chamber is a main field for carrying out the radiation interference test, and the field uniformity is used as an important index for measuring the performance of the test field, is a key for ensuring the effective proceeding of the test, and is a key for ensuring the reliability and the repeatability of the test result of the EUT in the electromagnetic radiation immunity test. It is important to test and evaluate the field uniformity in a semi-anechoic chamber.
An Electromagnetic Compatibility (EMC) anti-interference test is used to test whether Electromagnetic Compatibility requirements are satisfied. In the anti-interference test procedure of current EMC, can not the automatic problem that appears of record test procedure, need pass through surveillance camera head observation phenomenon, need personnel operation test system simultaneously, and the frequency point that specifically goes wrong when surveing the test (the anti-interference test of EMC is in a frequency channel within range, from end frequency channel to high frequency channel test), because the people who observes the camera phenomenon is not the same one with the personnel of control observation test system, can the information asynchronous appear, cause the wrong record of problem, inconvenient test problem reappears once more, in addition because need test more than two at least, efficiency is lower, cause the manpower extravagant. Therefore, a new semi-anechoic chamber device and an EMC testing method are needed.
Through the above analysis, the problems and defects of the prior art are as follows: in the anti-interference test procedure of current EMC, can not the automatic problem that appears of record test procedure, need pass through surveillance camera head observation phenomenon, need personnel operation test system simultaneously, and the frequency point of specifically appearing the problem when surveing the test, because the people who observes the camera phenomenon is not the same one with the personnel of control observation test system, can the information asynchronous that appears, cause the wrong record of problem, inconvenient test problem reappears once more, in addition because need test more than two people at least, efficiency is lower, cause the manpower extravagant.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a semi-anechoic chamber device and an electromagnetic compatibility (EMC) test method.
The present invention is achieved as described above, and a semi-anechoic chamber device includes: the device comprises a signal generation module, a signal acquisition module, a signal preprocessing module, a signal transmission module, a central control module, a signal conversion module, an EMC test module, an evaluation module, a data storage module and an updating display module.
The signal generation module is connected with the central control module and used for generating sine wave signals through the signal generator, amplifying the sine wave signals and transmitting the sine wave signals in an electromagnetic wave form;
the signal acquisition module is connected with the central control module and is used for collecting the generated electromagnetic wave signals through the signal acquisition device;
the signal preprocessing module is connected with the central control module and used for processing the acquired electromagnetic wave signals through a signal preprocessing program;
the signal transmission module is connected with the central control module and is used for transmitting the preprocessed electromagnetic wave signals to a central processor arranged in the control room through a signal transmission device;
the electromagnetic wave signal transmission after will preprocessing through signal transmission device to the central processing unit that sets up in the control room includes:
inserting the processed electromagnetic wave signal into pilot frequency information for sending; extracting pilot frequency information of a received signal, segmenting a Doppler change range and a change range of Doppler change rate, and matching the Doppler change range and the change range of Doppler change rate with the pilot frequency information to perform coarse capture;
the method specifically comprises the following steps:
(1) through a measurement and control transmission channel with Doppler frequency offset fdAnd a Doppler first order rate of change faIs sampled as Xr[n]：
Wherein H (n) is a channel gain coefficient, and N (n) is white Gaussian noise;
(2) from received signal Xr[n]In which pilot frequency information X of corresponding position is extractedrp[k]：
Wherein h (k) and n (k) are the channel gain coefficient and gaussian white noise at the corresponding pilot positions, respectively;
(3) maximum Doppler interval [ -F ]dmax,Fdmax]Dividing into N segments called N Doppler frequency shift channels, and dividing the maximum Doppler change rate interval [ -F ]amax,Famax]Dividing into M segments, called M Doppler rate-of-change channels, and generating N x M carriers of the formiFrequency deviation of Doppler, KthjThe carrier for each doppler rate of change channel is:
wherein
Is the Doppler frequency offset corresponding to the ith channel of the Doppler frequency offset channel,
is the Doppler change rate corresponding to the jth channel of the Doppler change rate channels; wherein i is 1,2, …, N, j is 1,2, …, M;
(4) mixing Xrp[k]To each channel
The multiplication is processed by FFT transform after passing through a filter, and the maximum value V is searched in the frequency domaini,j；
(5) In obtaining N x M Vi,jSearching again for the maximum value V among the maximum valuesmax(i,j)The channel in which the maximum value is located is preset
And
as the result of this coarse capture, respectively denoted as Fd'，Fa'；
A central processing unit arranged in the control room performs frequency offset compensation on the received signal, and then performs artificial frequency shift, diversity processing and demodulation on the signal with the residual Doppler frequency offset to obtain final data;
the central control module is connected with the signal generation module, the signal acquisition module, the signal preprocessing module, the signal transmission module, the signal conversion module, the EMC test module, the evaluation module, the data storage module and the updating display module and is used for coordinating and controlling the normal operation of each module of the semi-anechoic chamber device through a central processing unit arranged in a control room;
the signal conversion module is connected with the central control module and used for converting the electromagnetic wave signals into digital signals through the signal conversion device and transmitting the digital signals to the test equipment;
the EMC testing module is connected with the central control module and used for performing electromagnetic compatibility EMC testing on the semi-anechoic chamber device through electromagnetic compatibility testing equipment and generating a testing report;
the evaluation module is connected with the central control module and used for evaluating the EMC test result of the semi-anechoic chamber device through an evaluation program;
the data storage module is connected with the central control module and used for storing the acquired sine wave signals, the signal preprocessing results, the signal conversion results, the electromagnetic compatibility EMC test reports and the evaluation results through the memory;
and the updating display module is connected with the central control module and is used for updating and displaying the acquired sine wave signals, the signal preprocessing result, the signal conversion result, the electromagnetic compatibility EMC test report and the real-time data of the evaluation result through the display.
Further, the signal generation module comprises a signal generator, a directional coupler, a power amplifier, a radio frequency cable, a switching port and a transmitting antenna; the signal generator is sequentially connected with a power amplifier and a directional coupler, the directional coupler is connected with a transmitting antenna positioned in the semi-anechoic chamber device through a radio frequency cable, and the directional coupler is further connected with a power meter.
Furthermore, an omnidirectional field probe and a field intensity meter are further arranged in the semi-anechoic chamber device, and the field intensity meter is connected with the omnidirectional field probe in the semi-anechoic chamber device through an optical fiber.
Further, in the signal generation module, the signal generator is used for generating sine wave signals, and the sine wave signals are amplified and then emitted out in the form of electromagnetic waves, and the signal generation module comprises:
(1) generating sine wave electric signals through a signal generator, and amplifying the generated sine wave electric signals through a power amplifier;
(2) arranging a wall body adapter port on the wall of the semi-anechoic chamber device, and transmitting the amplified sine wave electric signal to an antenna through a radio frequency cable and the adapter port of the wall body;
(3) the amplified sine wave electric signal is transmitted out in the form of electromagnetic wave through the transmitting antenna, so that an electromagnetic field is generated in the semi-anechoic chamber device.
Further, in the signal preprocessing module, the processing the acquired electromagnetic wave signal by using a signal preprocessing program includes:
(1) acquiring a plurality of nodes of a semi-anechoic chamber device, and controlling the nodes to receive electromagnetic wave signals;
(2) comparing the electromagnetic wave signal with a sample signal to calculate a similarity value of each node, and calculating a global similarity value according to the similarity value of each node;
(3) and judging the sample signal which is most similar to the electromagnetic wave signal according to the global similarity value, and determining the type of the electromagnetic wave signal.
Further, before calculating the global similarity value according to the similarity value of each node, the method further includes: acquiring the global weight of each node and calculating the global similarity value according to the global weight; wherein, the calculation formula of the global similarity value is as follows:
wherein i is a positive integer and is less than or equal to the number of types of the sample signals, K is a positive integer and is less than or equal to the number K, G of the nodesiIs the global similarity value, omega, corresponding to the ith sample signali,kThe global weight for the kth node,
the similarity value for the kth node.
Further, the calculation formula of the similarity value of the node is as follows:
wherein i is a positive integer and is less than or equal to the number of types of the sample signals, k is a positive integer and is less than or equal to the number of the nodes, si(n) is the sample signal of the ith kind, x(k)(n) is the electromagnetic wave signal of the kth node.
Further, in the EMC test module, the performing an electromagnetic compatibility EMC test on the semi-anechoic chamber device by using an electromagnetic compatibility test apparatus includes:
(1) connecting and assembling electromagnetic compatibility performance testing equipment;
(2) selecting a test plane in the semi-anechoic chamber device, selecting a rectangular region to be tested by taking a central shaft of the test plane as a symmetry axis, and carrying out mesh point division on the region to be tested at equal intervals;
(3) placing the omnidirectional field probe on a grid point in a region to be measured, and measuring the field intensity value of the grid point;
(4) and selecting a vertical test surface above the horizontal uniform domain and perpendicular to the horizontal uniform domain, and sequentially sweeping the frequency of each test point to obtain a field intensity value.
Further, the test plane is a horizontal plane with a height not less than 0.8-1.0 m.
Further, the transmitting antenna and the omnidirectional field probe are on a same longitudinal straight line in the plane of the region to be measured 19, and the distance between the transmitting antenna and the omnidirectional field probe is 2 m.
Another objective of the present invention is to provide an EMC testing method for the semi-anechoic chamber device using the semi-anechoic chamber device.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for applying the semi anechoic chamber device when executed on an electronic device.
It is another object of the present invention to provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to apply the semi-anechoic chamber apparatus.
By combining all the technical schemes, the invention has the advantages and positive effects that: according to the semi-anechoic chamber device, the collected electromagnetic wave signals are processed through the signal preprocessing module, the type of the input signals is judged by adopting a multi-node cooperative processing method, and the accuracy of signal classification is improved; the half anechoic chamber device is subjected to electromagnetic compatibility EMC test by the EMC test module through electromagnetic compatibility test equipment, and the field uniformity of the half anechoic chambers with different sizes can be tested, so that the result is more accurate and reliable, the test efficiency is improved, and the test cost and the production cost are effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a semi-anechoic chamber device according to an embodiment of the present invention;
in the figure: 1. a signal generation module; 2. a signal acquisition module; 3. a signal preprocessing module; 4. a signal transmission module; 5. a central control module; 6. a signal conversion module; 7. an EMC test module; 8. an evaluation module; 9. a data storage module; 10. and updating the display module.
Fig. 2 is a flowchart of an EMC testing method for a semi-anechoic chamber device according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for generating a sine wave signal by a signal generator through a signal generating module, amplifying the sine wave signal, and transmitting the amplified sine wave signal in the form of an electromagnetic wave according to an embodiment of the present invention.
Fig. 4 is a flowchart of a method for processing an acquired electromagnetic wave signal by a signal preprocessing module using a signal preprocessing program according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for performing an EMC test on the semi-anechoic chamber device by using an EMC test module and an EMC performance test device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a semi-anechoic chamber device and an EMC testing method, which will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a semi-anechoic chamber device according to an embodiment of the present invention includes: the device comprises a signal generation module 1, a signal acquisition module 2, a signal preprocessing module 3, a signal transmission module 4, a central control module 5, a signal conversion module 6, an EMC test module 7, an evaluation module 8, a data storage module 9 and an updating display module 10.
The signal generation module 1 is connected with the central control module 5 and used for generating sine wave signals through the signal generator, amplifying the sine wave signals and transmitting the sine wave signals in an electromagnetic wave form;
the signal acquisition module 2 is connected with the central control module 5 and is used for collecting the generated electromagnetic wave signals through a signal acquisition device;
the signal preprocessing module 3 is connected with the central control module 5 and is used for processing the acquired electromagnetic wave signals through a signal preprocessing program;
the signal transmission module 4 is connected with the central control module 5 and is used for transmitting the preprocessed electromagnetic wave signals to a central processor arranged in the control room through a signal transmission device;
the central control module 5 is connected with the signal generation module 1, the signal acquisition module 2, the signal preprocessing module 3, the signal transmission module 4, the signal conversion module 6, the EMC test module 7, the evaluation module 8, the data storage module 9 and the updating display module 10 and is used for coordinating and controlling the normal operation of each module of the semi-anechoic chamber device through a central processing unit arranged in a control room;
the signal conversion module 6 is connected with the central control module 5 and used for converting the electromagnetic wave signals into digital signals through a signal conversion device and transmitting the digital signals to the test equipment;
the EMC test module 7 is connected with the central control module 5 and used for carrying out an EMC test on the semi-anechoic chamber device through electromagnetic compatibility test equipment and generating a test report;
the evaluation module 8 is connected with the central control module 5 and used for evaluating the EMC test result of the semi-anechoic chamber device through an evaluation program;
the data storage module 9 is connected with the central control module 5 and used for storing the acquired sine wave signals, the signal preprocessing results, the signal conversion results, the electromagnetic compatibility EMC test reports and the evaluation results through a memory;
and the updating display module 10 is connected with the central control module 5 and is used for updating and displaying the acquired sine wave signals, the signal preprocessing result, the signal conversion result, the electromagnetic compatibility EMC test report and the real-time data of the evaluation result through a display.
As shown in fig. 2, the method for testing EMC of a semi-anechoic chamber device according to an embodiment of the present invention includes the following steps:
s101, generating a sine wave signal by a signal generator through a signal generating module, amplifying the sine wave signal, and transmitting the sine wave signal in an electromagnetic wave form;
s102, collecting the generated electromagnetic wave signals by using a signal collection device through a signal collection module; processing the collected electromagnetic wave signals by a signal preprocessing module by utilizing a signal preprocessing program;
s103, transmitting the preprocessed electromagnetic wave signal to a central processing unit arranged in the control room by a signal transmission device through a signal transmission module;
s104, the central control module coordinates and controls the normal operation of each module of the semi-anechoic chamber device by using a central processing unit arranged in a control room;
s105, converting the electromagnetic wave signal into a digital signal by using a signal conversion device through a signal conversion module, and transmitting the digital signal to test equipment;
s106, performing electromagnetic compatibility (EMC) test on the semi-anechoic chamber device by using an EMC test module and electromagnetic compatibility test equipment, and generating a test report;
s107, evaluating the EMC test result of the semi-anechoic chamber device by utilizing an evaluation program through an evaluation module;
s108, storing the acquired sine wave signals, the signal preprocessing result, the signal conversion result, the electromagnetic compatibility EMC test report and the evaluation result by using a memory through a data storage module;
and S109, updating and displaying the acquired sine wave signals, the signal preprocessing result, the signal conversion result, the electromagnetic compatibility EMC test report and the real-time data of the evaluation result by the updating and displaying module through the display.
In step S101 provided in the embodiment of the present invention, the signal generating module includes a signal generator, a directional coupler, a power amplifier, a radio frequency cable, a switching port, and a transmitting antenna; the signal generator is sequentially connected with a power amplifier and a directional coupler, the directional coupler is connected with a transmitting antenna positioned in the semi-anechoic chamber device through a radio frequency cable, and the directional coupler is further connected with a power meter.
The embodiment of the invention provides a semi-anechoic chamber device, which is also internally provided with an omnidirectional field probe and a field intensity meter, wherein the field intensity meter is connected with the omnidirectional field probe positioned in the semi-anechoic chamber device through an optical fiber.
As shown in fig. 3, in step S101 provided by the embodiment of the present invention, the generating a sine wave signal by a signal generator through a signal generating module, amplifying the sine wave signal, and transmitting the amplified sine wave signal in the form of an electromagnetic wave, includes:
s201, generating a sine wave electric signal through a signal generator, and amplifying the generated sine wave electric signal through a power amplifier;
s202, arranging a wall body adapter on the wall of the semi-anechoic chamber device, and transmitting the amplified sine wave electric signal to an antenna through the adapter of the wall body through a radio frequency cable;
and S203, transmitting the amplified sine wave electric signal in the form of electromagnetic waves through a transmitting antenna, so as to generate an electromagnetic field in the semi-anechoic chamber device.
As shown in fig. 4, in step S102 provided in the embodiment of the present invention, the processing the acquired electromagnetic wave signal by the signal preprocessing module using the signal preprocessing program includes:
s301, acquiring a plurality of nodes of the semi-anechoic chamber device, and controlling the nodes to receive electromagnetic wave signals;
s302, comparing the electromagnetic wave signal with a sample signal to calculate a similarity value of each node, and calculating a global similarity value according to the similarity value of each node;
s303, judging the sample signal most similar to the electromagnetic wave signal according to the global similarity value, and determining the type of the electromagnetic wave signal.
In step S302 provided in this embodiment of the present invention, before calculating a global similarity value according to a similarity value of each node, the method further includes: acquiring the global weight of each node and calculating the global similarity value according to the global weight; wherein, the calculation formula of the global similarity value is as follows:
wherein i is a positive integer and is less than or equal to the number of types of the sample signals, K is a positive integer and is less than or equal to the number K, G of the nodesiIs the global similarity value, omega, corresponding to the ith sample signali,kThe global weight for the kth node,
the similarity value for the kth node.
The calculation formula of the similarity value of the node provided by the embodiment of the invention is as follows:
wherein i is a positive integer and is less than or equal to the number of types of the sample signals, k is a positive integer and is less than or equal to the number of the nodes, si(n) is the sample signal of the ith kind, x(k)(n) is the electromagnetic wave signal of the kth node.
The embodiment of the invention provides a method for transmitting a preprocessed electromagnetic wave signal to a central processing unit arranged in a control room through a signal transmission device, which comprises the following steps:
inserting the processed electromagnetic wave signal into pilot frequency information for sending; extracting pilot frequency information of a received signal, segmenting a Doppler change range and a change range of Doppler change rate, and matching the Doppler change range and the change range of Doppler change rate with the pilot frequency information to perform coarse capture;
the method specifically comprises the following steps:
through a measurement and control transmission channel with Doppler frequency offset fdAnd a Doppler first order rate of change faIs sampled as Xr[n]：
Wherein H (n) is a channel gain coefficient, and N (n) is white Gaussian noise;
from received signal Xr[n]In which pilot frequency information X of corresponding position is extractedrp[k]：
Wherein h (k) and n (k) are the channel gain coefficient and gaussian white noise at the corresponding pilot positions, respectively;
maximum Doppler interval [ -F ]dmax,Fdmax]Dividing into N segments called N Doppler frequency shift channels, and dividing the maximum Doppler change rate interval [ -F ]amax,Famax]Dividing into M segments, called M Doppler rate-of-change channels, and generating N x M carriers of the formiFrequency deviation of Doppler, KthjThe carrier for each doppler rate of change channel is:
wherein
Is the Doppler frequency offset corresponding to the ith channel of the Doppler frequency offset channel,
is the Doppler change rate corresponding to the jth channel of the Doppler change rate channels; wherein i is 1,2, …, N, j is 1,2, …, M;
mixing Xrp[k]To each channel
The multiplication is processed by FFT transform after passing through a filter, and the maximum value V is searched in the frequency domaini,j；
In obtaining N x M Vi,jSearching again for the maximum value V among the maximum valuesmax(i,j)The channel in which the maximum value is located is preset
And
as the result of this coarse capture, respectively denoted as Fd'，Fa'；
And a central processing unit arranged in the control room performs frequency offset compensation on the received signal, and then performs artificial frequency shift, diversity processing and demodulation on the signal with the residual Doppler frequency offset to obtain final data.
As shown in fig. 5, in step S106 provided by the embodiment of the present invention, the performing, by the EMC testing module, the EMC test on the semi-anechoic chamber device by using the EMC performance testing apparatus includes:
s401, connecting and assembling electromagnetic compatibility testing equipment;
s402, selecting a test plane in the semi-anechoic chamber device, selecting a rectangular region to be tested by taking a central shaft of the test plane as a symmetry axis, and performing mesh point division on the region to be tested at equal intervals;
s403, placing the omnidirectional field probe on a grid point in the region to be measured, and measuring the field intensity value of the grid point;
s404, selecting a vertical test surface above the horizontal uniform domain and vertical to the horizontal uniform domain, and sequentially sweeping the frequency of each test point to obtain a field intensity value.
In step S402 provided in the embodiment of the present invention, the test plane is a horizontal plane having a height of not less than 0.8-1.0 m.
In step S403 provided in the embodiment of the present invention, the transmitting antenna and the omnidirectional field probe are on the same longitudinal straight line in the plane of the region to be measured 19, and the distance between the transmitting antenna and the omnidirectional field probe is 2 m.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A semi-anechoic chamber device, comprising: the system comprises a signal generation module, a signal acquisition module, a signal preprocessing module, a signal transmission module, a central control module, a signal conversion module, an EMC test module, an evaluation module, a data storage module and an updating display module;
the signal generation module is connected with the central control module and used for generating sine wave signals through the signal generator, amplifying the sine wave signals and transmitting the sine wave signals in an electromagnetic wave form;
the signal acquisition module is connected with the central control module and is used for collecting the generated electromagnetic wave signals through the signal acquisition device;
the signal preprocessing module is connected with the central control module and used for processing the acquired electromagnetic wave signals through a signal preprocessing program;
the signal transmission module is connected with the central control module and is used for transmitting the preprocessed electromagnetic wave signals to a central processor arranged in the control room through a signal transmission device;
the electromagnetic wave signal transmission after will preprocessing through signal transmission device to the central processing unit that sets up in the control room includes:
inserting the processed electromagnetic wave signal into pilot frequency information for sending; extracting pilot frequency information of a received signal, segmenting a Doppler change range and a change range of Doppler change rate, and matching the Doppler change range and the change range of Doppler change rate with the pilot frequency information to perform coarse capture;
the method specifically comprises the following steps:
(1) through a measurement and control transmission channel with Doppler frequency offset fdAnd a Doppler first order rate of change faIs sampled as Xr[n]：
Wherein H (n) is a channel gain coefficient, and N (n) is white Gaussian noise;
(2) from received signal Xr[n]In which pilot frequency information X of corresponding position is extractedrp[k]：
Wherein h (k) and n (k) are the channel gain coefficient and gaussian white noise at the corresponding pilot positions, respectively;
(3) maximum Doppler interval [ -F ]dmax,Fdmax]Dividing into N segments called N Doppler frequency shift channels, and dividing the maximum Doppler change rate interval [ -F ]amax,Famax]Dividing into M segments, called M Doppler rate-of-change channels, and generating N x M carriers of the formiFrequency deviation of Doppler, KthjThe carrier for each doppler rate of change channel is:
wherein
Is the Doppler frequency offset corresponding to the ith channel of the Doppler frequency offset channel,
is the Doppler change rate corresponding to the jth channel of the Doppler change rate channels; wherein i is 1,2, …, N, j is 1,2, …, M;
(4) mixing Xrp[k]To each channel
Multiplying, FFT transforming after filter, searching in frequency domainMaximum value of cable Vi,j；
(5) In obtaining N x M Vi,jSearching again for the maximum value V among the maximum valuesmax(i,j)The channel in which the maximum value is located is preset
And
as the result of this coarse capture, respectively denoted as Fd'，Fa'；
A central processing unit arranged in the control room performs frequency offset compensation on the received signal, and then performs artificial frequency shift, diversity processing and demodulation on the signal with the residual Doppler frequency offset to obtain final data;
the central control module is connected with the signal generation module, the signal acquisition module, the signal preprocessing module, the signal transmission module, the signal conversion module, the EMC test module, the evaluation module, the data storage module and the updating display module and is used for coordinating and controlling the normal operation of each module of the semi-anechoic chamber device through a central processing unit arranged in a control room;
the signal conversion module is connected with the central control module and used for converting the electromagnetic wave signals into digital signals through the signal conversion device and transmitting the digital signals to the test equipment;
the EMC testing module is connected with the central control module and used for performing electromagnetic compatibility EMC testing on the semi-anechoic chamber device through electromagnetic compatibility testing equipment and generating a testing report;
the evaluation module is connected with the central control module and used for evaluating the EMC test result of the semi-anechoic chamber device through an evaluation program;
the data storage module is connected with the central control module and used for storing the acquired sine wave signals, the signal preprocessing results, the signal conversion results, the electromagnetic compatibility EMC test reports and the evaluation results through the memory;
and the updating display module is connected with the central control module and is used for updating and displaying the acquired sine wave signals, the signal preprocessing result, the signal conversion result, the electromagnetic compatibility EMC test report and the real-time data of the evaluation result through the display.
2. The semi-anechoic chamber device according to claim 1, wherein the signal generating module comprises a signal generator, a directional coupler, a power amplifier, a radio frequency cable, a switching port and a transmitting antenna; the signal generator is sequentially connected with a power amplifier and a directional coupler, the directional coupler is connected with a transmitting antenna positioned in the semi-anechoic chamber device through a radio frequency cable, and the directional coupler is further connected with a power meter.
3. The semi-anechoic chamber device according to claim 1, wherein an omnidirectional field probe and a field intensity meter are further provided in the semi-anechoic chamber device, and the field intensity meter is connected to the omnidirectional field probe in the semi-anechoic chamber device through an optical fiber.
4. The semi-anechoic chamber device according to claim 1, wherein the signal generating module generates the sine wave signal by the signal generator, amplifies the sine wave signal, and emits the amplified sine wave signal as the electromagnetic wave, and comprises:
(1) generating sine wave electric signals through a signal generator, and amplifying the generated sine wave electric signals through a power amplifier;
(2) arranging a wall body adapter port on the wall of the semi-anechoic chamber device, and transmitting the amplified sine wave electric signal to an antenna through a radio frequency cable and the adapter port of the wall body;
(3) the amplified sine wave electric signal is transmitted out in the form of electromagnetic wave through the transmitting antenna, so that an electromagnetic field is generated in the semi-anechoic chamber device.
5. The anechoic chamber device according to claim 1, wherein the signal preprocessing module for processing the collected electromagnetic wave signal by the signal preprocessing program comprises:
(1) acquiring a plurality of nodes of a semi-anechoic chamber device, and controlling the nodes to receive electromagnetic wave signals;
(2) comparing the electromagnetic wave signal with a sample signal to calculate a similarity value of each node, and calculating a global similarity value according to the similarity value of each node;
(3) and judging the sample signal which is most similar to the electromagnetic wave signal according to the global similarity value, and determining the type of the electromagnetic wave signal.
6. The semi-anechoic chamber device according to claim 5, wherein before calculating the global similarity value from the similarity values of the nodes, the method further comprises: acquiring the global weight of each node and calculating the global similarity value according to the global weight; wherein, the calculation formula of the global similarity value is as follows:
wherein i is a positive integer and is less than or equal to the number of types of the sample signals, K is a positive integer and is less than or equal to the number K, G of the nodesiIs the global similarity value, omega, corresponding to the ith sample signali,kThe global weight for the kth node,
the similarity value for the kth node.
7. The semi-anechoic chamber device according to claim 6, wherein the similarity value of the nodes is calculated as follows:
whereinI is a positive integer and is less than or equal to the number of the sample signals, k is a positive integer and is less than or equal to the number of the nodes, si(n) is the sample signal of the ith kind, x(k)(n) is the electromagnetic wave signal of the kth node.
8. The semi-anechoic chamber device according to claim 1, wherein in the EMC test module, the performing of the electromagnetic compatibility EMC test on the semi-anechoic chamber device using the electromagnetic compatibility test apparatus comprises:
(1) connecting and assembling electromagnetic compatibility performance testing equipment;
(2) selecting a test plane in the semi-anechoic chamber device, selecting a rectangular region to be tested by taking a central shaft of the test plane as a symmetry axis, and carrying out mesh point division on the region to be tested at equal intervals;
(3) placing the omnidirectional field probe on a grid point in a region to be measured, and measuring the field intensity value of the grid point;
(4) and selecting a vertical test surface above the horizontal uniform domain and perpendicular to the horizontal uniform domain, and sequentially sweeping the frequency of each test point to obtain a field intensity value.
9. The semi-anechoic chamber device according to claim 8, wherein the test plane is a horizontal plane having a height of not less than 0.8-1.0 m.
10. The semi-anechoic chamber device according to claim 8, wherein the transmitting antenna and the omnidirectional field probe are on a straight line in a longitudinal direction in the plane of the area to be measured 19, and a distance between the transmitting antenna and the omnidirectional field probe is 2 m.
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