CN115754548A - Multi-mode electric propulsion electromagnetic radiation interference test system and method - Google Patents

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

A multi-mode electric propulsion electromagnetic radiation interference testing system and method

technical field

The present application relates to the field of electric propulsion technology, in particular, to a multi-mode electric propulsion electromagnetic radiation interference testing system and method.

Background technique

The unintentional electromagnetic radiation interference generated when the electric propulsion system works stably will affect the electromagnetic compatibility of the satellite platform, so the electromagnetic radiation interference characteristics of the electric propulsion system must be obtained through the electromagnetic compatibility test, and then the electromagnetic compatibility between the electric propulsion system and the satellite platform must be obtained. Provides an important basis for problem solving. In addition, with the rapid development of electric propulsion technology, in order to meet the diverse space missions, the number of electric propulsion working modes has gradually increased accordingly. Therefore, how to effectively, reliably and efficiently obtain the electromagnetic radiation interference characteristics of the multi-mode electric propulsion system under stable working conditions has become an important goal of improving the electromagnetic compatibility of the electric propulsion system.

In the past, in the electromagnetic radiation interference test process of the electric propulsion system, the background noise test was performed before the formal test, and then the formal test was carried out when the electric propulsion system was working stably. After the test was completed, the formal test results were compared with the background noise test results. For the electromagnetic radiation interference generated by the electric propulsion system when it works stably, but the electromagnetic signal is closely related to time, this test method cannot strip the background noise interference signal from the signal of the real emission amplitude of the measured object during the test. , thus seriously affecting the reliability of electromagnetic radiation interference testing.

In addition, the electromagnetic radiation interference test of the electric propulsion system only considers the single-point or multi-point electric propulsion system as the tested object, and adopts the most traditional frequency domain scanning EMI mode as the electromagnetic radiation interference test method. Under the test conditions and low limit requirements, the test takes too long, which seriously affects the effectiveness and efficiency of the electromagnetic radiation interference test.

Contents of the invention

The present application provides a multi-mode electric propulsion electromagnetic radiation interference testing system and method, which can effectively, reliably, credibly and efficiently test the electromagnetic radiation interference when the multi-mode electric propulsion system works stably.

In order to achieve the above object, the application provides a multi-mode electric propulsion electromagnetic radiation interference test system, including a shielded darkroom and an EMI test control room, wherein: the inside of the shielded darkroom is provided with a wave-transparent vacuum chamber, an input antenna and a reference antenna; the input antenna and the reference antenna are set outside the wave-transparent vacuum chamber, and the electric propulsion system to be tested is installed inside the wave-transparent vacuum chamber; an EMI receiver and a high-performance computer are installed inside the EMI test control room, and the high-performance computer is connected to the EMI receiver ; Both the input antenna and the reference antenna are connected to the EMI receiver.

Further, the EMI receiver is a phase-locked dual-channel FFT time domain scanning EMI receiver.

Further, the test distance between the input antenna and the electric propulsion system under test is 1m.

Further, the test distance between the reference antenna and the electric propulsion system under test is 3m or 10m.

Further, the transmittance of the wave-transparent vacuum chamber to electromagnetic waves in the 10kHz-40GHz frequency band is greater than 60%.

In addition, the present application also provides a method for applying a multi-mode electric propulsion electromagnetic radiation interference test system, including the following steps: Step 1: Place the multi-mode electric propulsion system to be tested in a wave-transparent vacuum chamber, and make the tested electric propulsion system The propulsion system works stably according to the given working conditions; Step 2: Place the wave-transparent vacuum chamber as a whole in the shielded anechoic chamber, and install the antenna in the shielded anechoic chamber. The test distance between the input antenna and the electric propulsion system under test is 1m, and the reference antenna The test distance from the electric propulsion system under test is 3m or 10m, and the orientation and polarization direction of the input antenna and the reference antenna relative to the object under test are the same; Step 3: Connect the EMI receiver to the high-performance computer; Step 4: Turn on Warm up the EMI receiver for 10 minutes, set the FFT time domain scanning mode, connect the input antenna to the first channel of the EMI receiver, and connect the reference antenna to the second channel of the EMI receiver; Step 5: Set the working mode of the EMI receiver to Frequency synchronization, phase-locking dual-channel synchronization mode, turn on the measurement EMI receiver and set the required test frequency band for testing; Step 6: After the test is completed, transfer the electromagnetic radiation interference test results of the first channel and the second channel of the EMI receiver to the high-level The performance computer records and filters the background noise after processing, and gives the electromagnetic interference emission amplitude-frequency test results and amplitude-frequency limit curves of the multi-mode electric propulsion system under test under given working conditions; Step 7: Switch the electric propulsion system under test In the working mode of the propulsion system, repeat the test process of step 5 and step 6 after the next working condition is stable until all antenna polarization and frequency band tests are completed.

A multi-mode electric propulsion electromagnetic radiation interference testing system and method provided by the present invention has the following beneficial effects:

This application uses the adaptive interference noise cancellation method and the FFT time-domain scanning EMI test technology to quickly complete the electromagnetic radiation interference characteristic test of the electric propulsion system when it is working stably. Compared with the frequency scanning technology, it can effectively shorten the test time by more than 3 times and improve the electromagnetic The ability to distinguish between radiation interference signals and noise signals can effectively, reliably, credibly and efficiently test the electromagnetic radiation interference when the multi-mode electric propulsion system works stably, and it is of great importance to solve the electromagnetic compatibility problem of the multi-mode electric propulsion system. Guiding significance.

Description of drawings

The accompanying drawings, which constitute a part of this application, are included to provide a further understanding of the application and make other features, objects and advantages of the application apparent. The drawings and descriptions of the schematic embodiments of the application are used to explain the application, and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is a schematic structural diagram of a multi-mode electric propulsion electromagnetic radiation interference testing system provided according to 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 chamber, 6-tested electric propulsion system, 7-shielded darkroom, 8-EMI test control room.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientations or positional relationships indicated by "vertical", "horizontal", "horizontal", and "longitudinal" are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

Moreover, some of the above terms may be used to indicate other meanings besides orientation or positional relationship, for example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in this application according to specific situations.

In addition, the term "plurality" shall mean two or more than two.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 1, the application provides a multi-mode electric propulsion electromagnetic radiation interference test system, including a shielded darkroom 7 and an EMI test control room 8, wherein: the shielded darkroom 7 is provided with a wave-transparent vacuum chamber 5 and an input antenna 2 And the reference antenna 1; the input antenna 2 and the reference antenna 1 are both arranged outside the wave-transparent vacuum chamber 5, and the inside of the wave-transparent vacuum chamber 5 is provided with a tested electric propulsion system 6; the inside of the EMI test control room 8 is provided with an EMI receiver 3 and a high-performance computer 4, the high-performance computer 4 is connected to the EMI receiver 3; both the input antenna 2 and the reference antenna 1 are connected to the EMI receiver 3.

Specifically, the unintentional electromagnetic radiation interference generated when the electric propulsion system works stably will affect the electromagnetic compatibility of the satellite platform. In order to solve the electromagnetic compatibility problem between the electric propulsion system and the satellite platform, it is necessary to pass the electromagnetic compatibility test. Reliably obtain the electromagnetic radiation interference characteristics of the electric propulsion system, but with the increase of the electric propulsion working mode, when the test electromagnetic environment is complex, the test frequency range is wide and the test limit is low, the original electromagnetic radiation interference test method is cumbersome and cumbersome. If the time is too long, the electromagnetic radiation interference test of the electric propulsion system will be costly. Therefore, it is necessary to find a method that can improve the test efficiency and shorten the test cycle without losing the measurement accuracy, so as to solve the multi-mode electric propulsion electromagnetic radiation interference. Test questions. The multi-mode electric propulsion electromagnetic radiation interference test system provided by the embodiment of the present application uses the adaptive interference noise cancellation method to eliminate the interference of background noise on the test results when the multi-mode electric propulsion system works stably under a given working condition, wherein, The shielding chamber 7 is mainly used to shield the electromagnetic radiation interference signals around the electric propulsion system, the EMI test control room 8 is mainly used for the automatic control of the EMI test system, and the wave-transparent vacuum chamber 5 is connected with the vacuum system to provide the electric propulsion system The vacuum environment conditions, and timely transmit the electromagnetic radiation interference signal when the electric propulsion system is working as true as possible to the test antenna. The input antenna 2 is mainly used to measure the electromagnetic radiation interference signal (including electromagnetic environment interference signal) when the electric propulsion product is working. , the reference antenna 1 is mainly used to measure the electromagnetic environment interference signal when the electric propulsion is working, the EMI receiver 3 is used to receive the electromagnetic environment interference signal and the electric propulsion electromagnetic radiation interference signal synchronously, and the high-performance computer 4 is used to receive the EMI receiver 3 The signal is processed, and the real electromagnetic radiation interference signal is given when the electric propulsion is working, and the online measurement of the electromagnetic radiation interference test is realized.

Further, the EMI receiver 3 is a phase-locked dual-channel FFT time domain scanning EMI receiver. Using the EMI receiver 3 with FFT time-domain scanning technology can accurately obtain the electromagnetic radiation interference characteristics of the electric propulsion system when it is working stably, and can effectively shorten the test time by more than 3 times compared with the frequency scanning technology.

Further, the test distance between the input antenna 2 and the electric propulsion system 6 under test is 1 m. In the EMC military standard test, the test method generally uses the 1m method, so the input antenna 2 used to test the electromagnetic radiation interference signal when the electric propulsion is working should be placed at a position 1m away from the electric propulsion system 6 to be tested.

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 to measure the electromagnetic environment interference signal. In the shielded darkroom 7, the default electromagnetic environment interference signal is the same everywhere. However, in the EMC military standard test process, when the test antenna distance exceeds 3m, it is considered that the electromagnetic radiation interference signal will be There is a large attenuation so that it can be ignored, and 3m and 10m are the specified values of different measurement distances in EMC tests.

Specifically, during the test, when performing antenna layout, the position of the reference antenna 1 is in the same direction as the position of the input antenna 2, the test distance between the reference antenna 1 and the test electric propulsion system is 3m or 10m, and the input antenna 2 and the tested electric propulsion system The test distance of system 6 is 1m. The reference antenna 1 is used to test the electromagnetic environment interference signal, and the input antenna 2 is used to test the electromagnetic radiation interference signal when the electric propulsion is working. The two signals are tested synchronously. When entering the EMI receiver At 3 o'clock, through corresponding processing, the electromagnetic environment interference signal contained in the electromagnetic radiation interference signal of the tested electric propulsion operation can be stripped, and then the electromagnetic radiation interference signal during the operation of the electric propulsion system can be truly restored, and the electromagnetic radiation can be improved. The ability to distinguish between interference signals and noise signals.

Further, the transmittance of the wave-transparent vacuum chamber 5 to electromagnetic waves in the 10kHz-40GHz frequency band is greater than 60%. The wave-transparent vacuum chamber 5 is generally made of glass fiber and resin composite materials, and the corresponding installation and pressure-bearing strength must be ensured to ensure the 10 ^-3 Pa vacuum degree and sputtering resistance requirements during electric propulsion work. It has a high electromagnetic wave transmittance, and tries to restore the electromagnetic environment interference signal and the electromagnetic radiation interference signal when the electric propulsion system is working.

In addition, the embodiment of the present application also provides a method for applying a multi-mode electric propulsion electromagnetic radiation interference test system, including the following steps:

Step 1: Place the multi-mode tested electric propulsion system 6 in the wave-transparent vacuum chamber 5, and make the tested electric propulsion system 6 work stably according to a given working condition;

Step 2: Place the wave-transparent vacuum chamber 5 as a whole in the shielded darkroom 7, and install the antenna in the shielded darkroom 7. The test distance between the input antenna 2 and the electric propulsion system 6 under test is 1 m, and the distance between the reference antenna 1 and the electric propulsion system under test is 1 m. The test distance of the propulsion system 6 is 3m or 10m, and the orientation and polarization direction of the input antenna 2 and the reference antenna 1 relative to the measured object are the same;

Step 3: EMI receiver 3 is connected with high-performance computer 4;

Step 4: Turn on the EMI receiver 3 to warm up for 10 minutes, set the FFT time domain scanning mode, connect the input antenna 2 to the first channel of the EMI receiver 3, and connect the reference antenna 1 to the second channel of the EMI receiver 3;

Step 5: Set the working mode of EMI receiver 3 to frequency synchronization, phase-locked dual-channel synchronization mode, turn on the measurement EMI receiver 3 and set the required test frequency band for testing;

Step 6: After the test is completed, the electromagnetic radiation interference test results of the first channel and the second channel of the EMI receiver 3 are transmitted to the high-performance computer 4, and the background noise is recorded and filtered after processing, and the multi-mode electric propulsion system under test is obtained. 6 EMI emission amplitude-frequency test results and amplitude-frequency limit curves under given working conditions;

Step 7: Switch the working mode of the electric propulsion system 6 under test, and repeat the test process of steps 5 and 6 after the next working condition is stable until all antenna polarization and frequency band tests are completed.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this 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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