CN115754548A - Multi-mode electric propulsion electromagnetic radiation interference test system and method - Google Patents
Multi-mode electric propulsion electromagnetic radiation interference test system and method Download PDFInfo
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- CN115754548A CN115754548A CN202211470994.4A CN202211470994A CN115754548A CN 115754548 A CN115754548 A CN 115754548A CN 202211470994 A CN202211470994 A CN 202211470994A CN 115754548 A CN115754548 A CN 115754548A
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Abstract
The application relates to the technical field of electric propulsion, in particular to a multi-mode electric propulsion electromagnetic radiation interference test system and a method, wherein the system comprises a shielding darkroom and an EMI test control room, and the system comprises: a wave-transparent vacuum cabin, an input antenna and a reference antenna are arranged in the shielding darkroom; the input antenna and the reference antenna are both arranged outside the wave-transparent vacuum chamber, and the tested electric propulsion system is arranged inside the wave-transparent vacuum chamber; an EMI receiver and a high-performance computer are arranged in the EMI test control room, and the high-performance computer is connected with the EMI receiver; the input antenna and the reference antenna are both connected to an EMI receiver. The method and the device can quickly complete the electromagnetic radiation interference characteristic test when the electric propulsion system works stably by utilizing the self-adaptive interference noise cancellation method and the FFT time domain scanning EMI test technology, can effectively shorten the test time by more than 3 times compared with the frequency scanning technology, and improve the resolution capability of electromagnetic radiation interference signals and noise signals.
Description
Technical Field
The application relates to the technical field of electric propulsion, in particular to a multi-mode electric propulsion electromagnetic radiation interference testing system and method.
Background
The electromagnetic compatibility of the satellite platform is affected by unintentional electromagnetic radiation interference generated when the electric propulsion system works stably, so that the electromagnetic radiation interference characteristic of the electric propulsion system must be obtained through an electromagnetic compatibility test, and an important basis is provided for solving the problem of the electromagnetic compatibility of the electric propulsion system and the satellite platform. In addition, with the rapid development of electric propulsion technology, electric propulsion operating modes are also increasing correspondingly to meet diversified space missions. Therefore, how to effectively, reliably and efficiently acquire the electromagnetic radiation interference characteristics under the stable working condition of the multi-mode electric propulsion system becomes an important target for improving the electromagnetic compatibility of the electric propulsion system.
In the electromagnetic radiation interference test process of the conventional electric propulsion system, a background noise test is firstly carried out before formal test is required, then the formal test is carried out when the electric propulsion system stably works, the electromagnetic radiation interference generated when the electric propulsion system stably works is obtained by comparing the formal test result with the background noise test result after the test is finished, but the electromagnetic signal is closely related to time, and the test method cannot strip and eliminate the background noise interference signal from a signal of a real emission amplitude of a tested object during the test, so that the reliability of the electromagnetic radiation interference test is seriously influenced.
In addition, the electromagnetic radiation interference test of the electric propulsion system only considers the electric propulsion system working at a single point or multiple points as a tested object, adopts the most traditional frequency domain scanning EMI mode as the mode of the electromagnetic radiation interference test, causes too long test time under the test conditions of certain wide frequency bands and low limit values, and seriously influences the effectiveness and the high efficiency of the electromagnetic radiation interference test.
Disclosure of Invention
The application provides a multi-mode electric propulsion electromagnetic radiation interference testing system and method, which can effectively, reliably, credibly and efficiently test electromagnetic radiation interference when the multi-mode electric propulsion system stably works.
To achieve the above object, the present application provides a multi-mode electrically-propelled electromagnetic radiation interference test system, comprising a dark shielding room and an EMI test control room, wherein: a wave-transparent vacuum chamber, an input antenna and a reference antenna are arranged in the shielding darkroom; the input antenna and the reference antenna are both arranged outside the wave-transparent vacuum chamber, and the tested electric propulsion system is arranged inside the wave-transparent vacuum chamber; an EMI receiver and a high-performance computer are arranged in the EMI test control room, and the high-performance computer is connected with the EMI receiver; the input antenna and the reference antenna are both connected to an EMI receiver.
Further, the EMI receiver is a phase-locked two-channel FFT time-domain scanning EMI receiver.
Further, the test distance between the input antenna and the tested electric propulsion system is 1m.
Further, the test distance between the reference antenna and the tested electric propulsion system is 3m or 10m.
Furthermore, the transmissivity of the wave-transparent vacuum chamber to electromagnetic waves in a frequency range of 10 kHz-40 GHz is more than 60%.
In addition, the application also provides a method for applying the multi-mode electric propulsion electromagnetic radiation interference test system, which comprises the following steps: step 1: placing the multi-mode tested electric propulsion system in a wave-transparent vacuum cabin, and enabling the tested electric propulsion system to stably work according to a given working condition; step 2: the wave-transparent vacuum cabin is integrally placed in a shielding darkroom, an antenna is arranged in the shielding darkroom, the testing distance between an input antenna and a tested electric propulsion system is 1m, the testing distance between a reference antenna and the tested electric propulsion system is 3m or 10m, and the orientation and the polarization direction of the input antenna and the reference antenna relative to a tested object are the same; and step 3: connecting the EMI receiver with a high-performance computer; and 4, step 4: starting an EMI receiver for preheating for 10min, setting an FFT time domain scanning mode, connecting an input antenna into a first channel of the EMI receiver, and connecting a reference antenna into a second channel of the EMI receiver; and 5: setting the working mode of the EMI receiver as a frequency synchronization and phase locking dual-channel synchronization mode, and turning on the EMI receiver to be measured to set a required test frequency band for testing; step 6: after the test is finished, transmitting the electromagnetic radiation interference test results of the first channel and the second channel of the EMI receiver to a high-performance computer, recording and filtering background noise after processing, and giving an electromagnetic interference emission amplitude-frequency test result and an amplitude-frequency limit value curve of the multi-mode tested electric propulsion system under a given working condition; and 7: and switching the working mode of the tested electric propulsion system, and repeating the test processes of the step 5 and the step 6 after the next working condition is stable until the test of all antenna polarization and frequency bands is completed.
The multi-mode electric propulsion electromagnetic radiation interference test system and method provided by the invention have the following beneficial effects:
the method and the device quickly complete the electromagnetic radiation interference characteristic test when the electric propulsion system stably works by utilizing the self-adaptive interference noise cancellation method and the FFT time domain scanning EMI test technology, can effectively shorten the test time by more than 3 times compared with the frequency scanning technology, improve the resolution capability of electromagnetic radiation interference signals and noise signals, can effectively, reliably, credibly and efficiently test the electromagnetic radiation interference when the multi-mode electric propulsion system stably works, and have important engineering guidance significance for solving the electromagnetic compatibility problem of the multi-mode electric propulsion system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic structural diagram of a multi-mode electrically-propelled electromagnetic radiation interference test system provided in accordance with an embodiment of the present application;
in the figure: 1-reference antenna, 2-input antenna, 3-EMI receiver, 4-high performance computer, 5-wave-transparent vacuum cabin, 6-tested electric propulsion system, 7-shielding darkroom, 8-EMI test control room.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the present application provides a multi-mode electrically-propelled electromagnetic radiation interference test system comprising a dark shielding room 7 and an EMI test control room 8, wherein: a wave-transparent vacuum chamber 5, an input antenna 2 and a reference antenna 1 are arranged in the shielding darkroom 7; the input antenna 2 and the reference antenna 1 are both arranged outside the wave-transparent vacuum chamber 5, and the tested electric propulsion system 6 is arranged inside the wave-transparent vacuum chamber 5; an EMI receiver 3 and a high-performance computer 4 are arranged in the EMI test control room 8, and the high-performance computer 4 is connected with the EMI receiver 3; both the input antenna 2 and the reference antenna 1 are connected to an EMI receiver 3.
Specifically, unintentional electromagnetic radiation interference generated when an electric propulsion system stably works can affect the electromagnetic compatibility of a satellite platform, in order to solve the problem of the electromagnetic compatibility of the electric propulsion system and the satellite platform, the electromagnetic radiation interference characteristics of the electric propulsion system are effectively, reliably and credibly obtained through an electromagnetic compatibility test, but with the increase of an electric propulsion working mode, when the electromagnetic environment is tested to be complex, the test frequency band is wide, and the test limit value is low, the original electromagnetic radiation interference test method is tedious in process and overlong, the electromagnetic radiation interference test cost of the electric propulsion system is high, and therefore a method capable of improving the test efficiency and shortening the test period on the premise of not losing the measurement accuracy is required to be sought, and the problem of the multi-mode electric propulsion electromagnetic radiation interference test is further solved. The multi-mode electric propulsion electromagnetic radiation interference test system provided by the embodiment of the application can eliminate the interference of background noise to a test result when the multi-mode electric propulsion system stably works under a given working condition by using a self-adaptive interference noise cancellation method, wherein the shielding darkroom 7 is mainly used for shielding electromagnetic radiation interference signals around the electric propulsion system, the EMI test control room 8 is mainly used for automatically controlling the EMI test system, the wave-transparent vacuum cabin 5 is connected with the vacuum system and is used for providing a vacuum environment condition for the electric propulsion system to work and timely transmitting the electromagnetic radiation interference signals when the electric propulsion system works to the test antenna as truly as possible, the input antenna 2 is mainly used for measuring the electromagnetic radiation interference signals (including electromagnetic environment interference signals) when the electric propulsion product works, the reference antenna 1 is mainly used for measuring the electromagnetic environment interference signals when the electric propulsion works, the EMI receiver 3 is used for synchronously receiving the electromagnetic environment interference signals and the electric propulsion electromagnetic radiation interference signals, and the high-performance computer 4 is used for processing the signals received by the EMI receiver 3 and giving out the actual electromagnetic radiation interference signals when the electric propulsion works, so as to realize the online measurement of the electromagnetic radiation interference test.
Further, the EMI receiver 3 is a phase-locked two-channel FFT time-domain scanning EMI receiver. The EMI receiver 3 with the FFT time domain scanning technology can accurately acquire the electromagnetic radiation interference characteristic of the electric propulsion system during stable work, and compared with the frequency scanning technology, the EMI receiver can effectively shorten the test time by more than 3 times.
Further, the test distance between the input antenna 2 and the tested electric propulsion system 6 is 1m. In the EMC military standard test, the test mode generally adopts 1m method, so the input antenna 2 for electromagnetic radiation interference signal during the test electric propulsion work should be placed at a position 1m away from the tested electric propulsion system 6.
Further, the test distance between the reference antenna 1 and the tested electric propulsion system 6 is 3m or 10m. The reference antenna 1 is mainly used for measuring electromagnetic environment interference signals, the electromagnetic environment interference signals are defaulted to be the same everywhere in the darkroom 7, in the EMC military mapping test process, when the distance of the test antenna exceeds 3m, the electromagnetic radiation interference signals are considered to be greatly attenuated so as to be basically ignored, and 3m and 10m are specified values of different measurement distances in the EMC test.
Specifically, in the testing process, when the antenna layout is performed, the position of the reference antenna 1 and the position of the input antenna 2 are in the same direction, the testing distance between the reference antenna 1 and the testing electric propulsion system is 3m or 10m, the testing distance between the input antenna 2 and the tested electric propulsion system 6 is 1m, the reference antenna 1 is used for testing electromagnetic environment interference signals, the input antenna 2 is used for testing electromagnetic radiation interference signals during electric propulsion work, the two signals are tested synchronously, and the electromagnetic environment interference signals contained in the tested electromagnetic radiation interference signals during electric propulsion work can be stripped through corresponding processing when entering the EMI receiver 3, so that the electromagnetic radiation interference signal condition during electric propulsion work is truly restored, and the resolution capability of the electromagnetic radiation interference signals and noise signals is improved.
Furthermore, the transmissivity of the wave-transparent vacuum chamber 5 to electromagnetic waves in a frequency range of 10 kHz-40 GHz is more than 60%. The wave-transparent vacuum chamber 5 is generally made of glass fiber and resin composite materials, and the corresponding installation and bearing strength are ensured to ensure 10 of the electric propulsion during working -3 pa vacuum degree and sputtering resistance, and simultaneously has higher electromagnetic wave transmissivity to reduce electromagnetic environment interference signals and electromagnetic radiation interference signals when the electric propulsion system works as much as possible.
In addition, the embodiment of the application also provides a method for applying the multi-mode electric propulsion electromagnetic radiation interference test system, which comprises the following steps:
step 1: placing the multi-mode tested electric propulsion system 6 in the wave-transparent vacuum chamber 5, and enabling the tested electric propulsion system 6 to stably work according to a given working condition;
step 2: the wave-transparent vacuum chamber 5 is integrally placed in a shielding dark room 7, an antenna is arranged in the shielding dark room 7, the testing distance between an input antenna 2 and a tested electric propulsion system 6 is 1m, the testing distance between a reference antenna 1 and the tested electric propulsion system 6 is 3m or 10m, and the orientation and the polarization direction of the input antenna 2 and the reference antenna 1 relative to a tested object are the same;
and step 3: connecting the EMI receiver 3 with a high-performance computer 4;
and 4, step 4: starting an EMI receiver 3 for preheating for 10min, setting an FFT time domain scanning mode, accessing an input antenna 2 into a first channel of the EMI receiver 3, and accessing a reference antenna 1 into a second channel of the EMI receiver 3;
and 5: setting the working mode of the EMI receiver 3 as a frequency synchronization and phase locking dual-channel synchronization mode, and turning on the EMI receiver 3 to be measured to set a required test frequency band for testing;
step 6: after the test is finished, transmitting the electromagnetic radiation interference test results of the first channel and the second channel of the EMI receiver 3 to the high-performance computer 4, recording and filtering background noise after processing, and giving an electromagnetic interference emission amplitude-frequency test result and an amplitude-frequency limit value curve of the multi-mode tested electric propulsion system 6 under a given working condition;
and 7: and (4) switching the working mode of the tested electric propulsion system 6, and repeating the test processes of the step 5 and the step 6 after the next working condition is stable until the test of all the antenna polarization and frequency bands is completed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A multi-mode, electrically-propelled electromagnetic radiation interference test system comprising a dark shielded room and an EMI test control room, wherein:
a wave-transparent vacuum cabin, an input antenna and a reference antenna are arranged in the shielding darkroom;
the input antenna and the reference antenna are both arranged outside the wave-transparent vacuum chamber, and a tested electric propulsion system is arranged inside the wave-transparent vacuum chamber;
an EMI receiver and a high-performance computer are arranged in the EMI test control room, and the high-performance computer is connected with the EMI receiver;
the input antenna and the reference antenna are both connected to the EMI receiver.
2. The multi-mode, electrically-propelled electromagnetic radiation interference (EMI) test system of claim 1, wherein the EMI receiver is a phase-locked, two-channel FFT time-domain scanning EMI receiver.
3. The multi-mode electrically-propelled electromagnetic radiation interference test system of claim 1, wherein the input antenna is at a test distance of 1m from the electric propulsion system under test.
4. The multi-mode electrically-propelled electromagnetic radiation interference test system of claim 3, wherein the test distance of the reference antenna from the tested electric propulsion system is 3m or 10m.
5. The multi-mode electrically-propelled electromagnetic radiation interference testing system of claim 1, wherein the wave-transparent vacuum chamber has a transmission of > 60% for electromagnetic waves in the frequency range of 10kHz to 40 GHz.
6. A method of using the multi-mode electrically-propelled electromagnetic radiation interference test system of any of claims 1-5, comprising the steps of:
step 1: placing the multi-mode tested electric propulsion system in a wave-transparent vacuum cabin, and enabling the tested electric propulsion system to stably work according to a given working condition;
step 2: the wave-transparent vacuum cabin is integrally placed in a shielding darkroom, an antenna is arranged in the shielding darkroom, the testing distance between an input antenna and a tested electric propulsion system is 1m, the testing distance between a reference antenna and the tested electric propulsion system is 3m or 10m, and the orientation and the polarization direction of the input antenna and the reference antenna relative to a tested object are the same;
and 3, step 3: connecting the EMI receiver with a high-performance computer;
and 4, step 4: starting an EMI receiver for preheating for 10min, setting an FFT time domain scanning mode, connecting an input antenna into a first channel of the EMI receiver, and connecting a reference antenna into a second channel of the EMI receiver;
and 5: setting the working mode of the EMI receiver as a frequency synchronization and phase locking dual-channel synchronization mode, and turning on the EMI receiver to be measured to set a required test frequency band for testing;
step 6: after the test is finished, transmitting the electromagnetic radiation interference test results of the first channel and the second channel of the EMI receiver to a high-performance computer, recording and filtering background noise after processing, and giving an electromagnetic interference emission amplitude-frequency test result and an amplitude-frequency limit value curve of the multi-mode tested electric propulsion system under a given working condition;
and 7: and (4) switching the working mode of the tested electric propulsion system, and repeating the test processes of the step (5) and the step (6) after the next working condition is stable until the test of all antenna polarization and frequency bands is completed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117723847A (en) * | 2024-01-22 | 2024-03-19 | 哈尔滨工业大学 | Microwave probe for measuring electric propulsion electromagnetic radiation signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117723847A (en) * | 2024-01-22 | 2024-03-19 | 哈尔滨工业大学 | Microwave probe for measuring electric propulsion electromagnetic radiation signal |
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