CN112394245B - Electromagnetic compatibility analysis method for satellite system with large-size multi-wave-level SAR antenna - Google Patents
Electromagnetic compatibility analysis method for satellite system with large-size multi-wave-level SAR antenna Download PDFInfo
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Abstract
The invention discloses an electromagnetic compatibility analysis method of a satellite system with a large-size multi-wave-level SAR antenna, which comprises the following steps: 1. analyzing radiation characteristics of a single feed source; 2. analyzing radiation characteristics of a feed source array; 3. analyzing radiation characteristics of the large-size antenna; 4. establishing a satellite model, and analyzing the radiation characteristics of a five-satellite antenna; 6. antenna isolation analysis; 7. the antenna radiates the field intensity analysis on the satellite; on one hand, the invention can be suitable for electromagnetic compatibility analysis of the ultra-large electric size satellite; on the other hand, when electromagnetic compatibility analysis is carried out on different wave positions of satellite SAR load, all analysis processes are not required to be repeated, and analysis efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility analysis of satellite systems, and particularly relates to an electromagnetic compatibility analysis method of a satellite system with a large-size multi-wavelength SAR antenna.
Background
Electromagnetic compatibility is an important content of the reliability design of a microwave loading satellite system, and the electromagnetic compatibility directly influences whether satellite loading can work normally or not. With the development of satellite technology, load power and sensitivity are continuously improved, and the working mode is more and more complex, which also puts higher requirements on electromagnetic compatibility of satellites. In order to ensure electromagnetic reliability of the satellite, the satellite electromagnetic compatibility must be analyzed.
At present, electromagnetic compatibility analysis is generally carried out by adopting various commercial electromagnetic simulation analysis software. However, as the electrical size of satellites increases, the hardware resources required for electromagnetic compatibility analysis increase significantly, and conventional workstations have failed to accommodate the analysis requirements. For SAR load satellites using large transmitting surface antennas, the space occupied by the antenna size and the satellite size is about tens of meters, the frequency range covers the L-Ka frequency band, and the electric size object of such a scale cannot realize the capability of using a full wave analysis method, and cannot completely use a high frequency method to reduce the analysis precision.
On the other hand, SAR loaded satellites typically have multiple wave positions that need to be covered during analysis. If the electromagnetic compatibility analysis for each wave position is to repeat all the analysis processes, the analysis workload is large, and the analysis efficiency is insufficient.
Disclosure of Invention
In view of the above, the invention provides an electromagnetic compatibility analysis method of a satellite system with a large-size multi-wave-level SAR antenna, which can be suitable for electromagnetic compatibility analysis of a satellite with an oversized electric size on one hand; on the other hand, when electromagnetic compatibility analysis is carried out on different wave positions of satellite SAR load, all analysis processes are not required to be repeated, and analysis efficiency is improved.
The technical scheme for realizing the invention is as follows:
a satellite system electromagnetic compatibility analysis method with a large-size multi-wave-level SAR antenna comprises the following steps:
step one, single feed source radiation characteristic analysis;
101. modeling is conducted on a single feed source of the load antenna;
102. analyzing the radiation pattern of a single feed source by adopting a full wave analysis method in an electromagnetic field numerical calculation method;
103. establishing a closed body covering the whole feed source array, and taking the closed body as a near-field equivalent source;
104. analyzing a near-field equivalent source generated by a single feed source by adopting a full-wave analysis method in an electromagnetic field numerical calculation method;
105. checking a near field equivalent source based on structural compatibility, wherein the near field equivalent source obtained in the step 104 is taken as a radiation source, a full wave analysis method in an electromagnetic field numerical value calculation method is adopted to analyze the directional diagram, whether the directional diagram obtained by analyzing the near field equivalent source as the radiation source is consistent with the directional diagram obtained by adopting antenna structure analysis in the step 102 is determined, if so, the step II is entered, otherwise, the step 103 is returned, a closed body is adjusted, and the analysis is carried out again until the directional diagrams are consistent;
step two, analyzing radiation characteristics of the feed source array;
201. according to the design scheme of the feed source, determining the amplitude and the phase of different wave position feed source arrays;
202. vector synthesis is carried out on the directional diagrams corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so that the directional diagrams of the feed source array are obtained;
203. vector synthesis is carried out on the near field equivalent sources corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so that the near field equivalent sources of the feed source array are obtained;
step three, analyzing radiation characteristics of the large-size antenna;
301. establishing a large-size antenna model;
302. a radiation pattern of the feed source array is imported, and the phase center of the radiation pattern is consistent with the phase center of the feed source array;
303. analyzing the radiation pattern of the large-size antenna by adopting a high-frequency analysis method in an electromagnetic field numerical calculation method;
step four, a satellite model is established, wherein the satellite model is a three-dimensional structure model, only the external part structure and the body structure of the satellite are reserved in the satellite model, the structure in a satellite cabin is ignored, and the material is set to be metal aluminum;
fifthly, analyzing radiation characteristics of the satellite-mounted antenna;
501. introducing a large-size antenna radiation pattern into the satellite model, wherein the phase center is consistent with the antenna phase center;
502. for a large-size antenna of a satellite, analyzing a pattern of the large-size antenna after satellite installation by adopting a high-frequency analysis method in an electromagnetic field numerical calculation method;
503. for a platform antenna of a satellite, analyzing a pattern of the satellite-mounted platform antenna by adopting a full-wave analysis method in an electromagnetic field numerical calculation method;
step six, antenna isolation analysis;
601. determining a transmitting antenna pattern and a receiving antenna pattern to be analyzed;
602. determining a distance R and a frequency f between a transmitting antenna and a receiving antenna to be analyzed;
603. calculating the isolation degree I of the transmitting antenna and the receiving antenna according to the following steps;
wherein c represents the speed of light; θ and φ are the pitch and azimuth angles of the antenna pattern, respectively; g t And G r Gains in the θ and φ directions for the transmit antenna pattern and the receive antenna pattern, respectively;
step seven, analyzing the radiation field intensity of the antenna on the satellite;
701. introducing a large-size antenna model into the satellite model;
702. introducing a near-field equivalent source;
703. analyzing field intensity E generated by SAR antenna on satellite surface by frequency domain analysis method in electromagnetic field numerical calculation method p ；
704. Determining SAR load transmitting power P according to design index of satellite t ；
705. Determining field intensity corresponding to SAR load transmitting power based on the analysis result of the step 703;
where E is the field strength at the transmit power corresponding to the SAR payload.
The beneficial effects are that:
first, the invention comprehensively adopts a full-wave analysis method and a high-frequency analysis method when the analysis of the oversized electric size object is involved, and can realize electromagnetic compatibility analysis aiming at the oversized electric size satellite on the premise of ensuring the analysis precision, and the analysis precision can be improved by more than 10 dB.
Secondly, the invention provides a near-field equivalent source analysis method based on structural compatibility, which can effectively improve the analysis precision of the near-field equivalent source analysis method.
Thirdly, the invention can realize electromagnetic compatibility analysis of the multi-wave-level SAR loading satellite, so that the influence of the multi-wave-level on the analysis is as early as possible, the electromagnetic compatibility analysis of the whole process is not required to be carried out on each wave-level, and the analysis efficiency is improved.
Drawings
FIG. 1 is a flow chart of the analysis of the present invention.
Fig. 2 shows the analysis result of the influence of the exemplary structure on the near-field equivalent source, wherein (a) is a schematic diagram of the near-field equivalent source, and (b) is a schematic diagram of the antenna structure source.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
Examples
The method is implemented on a workstation, and the software adopts three-dimensional electromagnetic simulation analysis software CST. And analyzing the isolation between the L-band SAR load antenna and S-band measurement and control and the electric field radiation intensity generated by the L-band SAR load antenna on the satellite surface. As shown in fig. 1, the specific process is as follows:
step one, single feed radiation characteristic analysis.
1) Modeling is performed for a single feed of a load antenna. The feed source antenna is a rectangular horn antenna, the model structure is consistent with the actual waveform, but the feed source antenna does not comprise parts such as screws, connecting waveguides, cables and the like.
2) The analysis frequency is set to be L frequency band and S frequency band, and the radiation pattern of a single feed source is analyzed by adopting a full wave analysis method and a time domain finite difference analysis method in an electromagnetic field numerical calculation method.
3) And establishing a closed cube covering the whole feed source array, and taking the closed cube as a near-field equivalent source.
4) And analyzing the L-band near-field equivalent source generated by a single feed source by adopting a full-wave analysis method time domain finite difference method in an electromagnetic field numerical value calculation method.
5) Near field equivalent source verification based on structural compatibility. And 4) using the near field equivalent source in the step 4) as a radiation source, analyzing the radiation pattern by using a full wave analysis method in an electromagnetic field numerical calculation method, and comparing the analysis result in the step 2), and adopting the near field equivalent source to perform the next analysis if the radiation pattern obtained by the two analyses is basically consistent as shown in fig. 2 (a) and (b).
And step two, analyzing radiation characteristics of the feed source array.
1) The load carries out wave bit array by 9 feed sources, and the amplitude and the phase of different wave bit feed source arrays are determined.
2) Taking 0-degree wave position as an example, vector synthesis is carried out on the directional diagrams corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so as to obtain the directional diagrams of the feed source array.
3) And vector synthesis is carried out on the near-field equivalent sources corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so that the near-field equivalent sources of the feed source array are obtained.
And thirdly, analyzing radiation characteristics of the large-size antenna.
1) And building a large-size antenna model. Because the antenna is a mesh structure reflecting surface antenna, the mesh structure is fitted to a solid surface structure to replace the solid surface structure.
2) And (3) importing a radiation pattern of the feed source array, wherein the phase center of the radiation pattern is consistent with the phase center of the feed source array.
3) And analyzing the radiation pattern of the large-size antenna by adopting a high-frequency analysis method in an electromagnetic field numerical calculation method and a bouncing ray method.
And step four, establishing a satellite analysis model. The satellite model is a three-dimensional structural model. The satellite model only retains the satellite external component structure and the satellite body structure, and the material is selected to be metal aluminum.
Step five: and (5) analyzing the radiation characteristics of the satellite-mounted antenna.
1) And a large-size antenna radiation pattern is introduced, and the phase center is consistent with the antenna phase center.
2) And analyzing the direction diagram of the large-size antenna after satellite mounting by adopting a high-frequency analysis method and a bouncing ray method in an electromagnetic field numerical value calculation method.
3) The satellite measurement and control antenna adopts a full wave analysis method time domain finite difference method in an electromagnetic field numerical calculation method to analyze the L-band and S-band directional diagrams after satellite loading. In the analysis process, only the structure of the mounting surface where the measurement and control antenna is positioned is reserved.
And step six, antenna isolation analysis.
1) And setting the load antenna as a transmitting antenna, setting the measurement and control antenna as a receiving antenna, and respectively determining the directional patterns of the L frequency band and the S frequency band.
2) The distance and frequency between the load antenna and the measurement and control antenna to be analyzed are determined.
3) And calculating according to the corresponding antenna pattern gain and spatial attenuation to obtain the antenna isolation degree:
wherein: i is isolation; g r Gain for the receive antenna pattern; g t Gain for the transmit antenna pattern; c is the speed of light; r is the phase center distance of the transmitting antenna and the receiving antenna; f is the frequency; θ is pitch angle; phi is the azimuth angle.
4) The isolation of the antennas of the L frequency band and the S frequency band is 77dB and 82dB respectively.
And seventhly, analyzing the radiation field intensity of the antenna on the satellite.
1) And importing a large-size antenna solid surface structure model into the satellite analysis model.
2) A near field equivalent source is introduced.
3) Setting the input power to be 1W, and analyzing the field intensity generated by the SAR antenna on the satellite surface by adopting a multi-layer rapid multipole method of a frequency domain calculation method in an electromagnetic field numerical calculation method.
4) The SAR load transmitting power is determined to be 20000W.
5) Determining the field intensity when the SAR load is transmitted according to the analysis result of 3):
wherein E is the field intensity corresponding to SAR load transmitting power, E p 3) analysis results.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The electromagnetic compatibility analysis method of the satellite system with the large-size multi-wave-level SAR antenna is characterized by comprising the following steps of:
step one, single feed source radiation characteristic analysis;
101. modeling is conducted on a single feed source of the load antenna;
102. analyzing the radiation pattern of a single feed source by adopting a full wave analysis method in an electromagnetic field numerical calculation method;
103. establishing a closed body covering the whole feed source array, and taking the closed body as a near-field equivalent source;
104. analyzing a near-field equivalent source generated by a single feed source by adopting a full-wave analysis method in an electromagnetic field numerical calculation method;
105. checking a near field equivalent source based on structural compatibility, wherein the near field equivalent source obtained in the step 104 is taken as a radiation source, a full wave analysis method in an electromagnetic field numerical value calculation method is adopted to analyze the directional diagram, whether the directional diagram obtained by analyzing the near field equivalent source is consistent with the radiation directional diagram of the single feed source obtained in the step 102 is determined, if so, the step II is entered, otherwise, the step 103 is returned, a closed body is adjusted, and the analysis is carried out again until the directional diagrams are consistent;
step two, analyzing radiation characteristics of the feed source array;
201. according to the design scheme of the feed source, determining the amplitude and the phase of different wave position feed source arrays;
202. vector synthesis is carried out on the directional diagrams corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so that the directional diagrams of the feed source array are obtained;
203. vector synthesis is carried out on the near field equivalent sources corresponding to the single feed source according to the amplitude and phase relation of the feed source array, so that the near field equivalent sources of the feed source array are obtained;
step three, analyzing radiation characteristics of the large-size antenna;
301. establishing a large-size antenna model;
302. a radiation pattern of the feed source array is imported, and the phase center of the radiation pattern is consistent with the phase center of the feed source array;
303. analyzing the radiation pattern of the large-size antenna by adopting a high-frequency analysis method in an electromagnetic field numerical calculation method;
step four, a satellite model is established, wherein the satellite model is a three-dimensional structure model, only the external part structure and the body structure of the satellite are reserved in the satellite model, the structure in a satellite cabin is ignored, and the material is set to be metal aluminum;
fifthly, analyzing radiation characteristics of the satellite-mounted antenna;
501. introducing a large-size antenna radiation pattern into the satellite model, wherein the phase center is consistent with the phase center of the large-size antenna;
502. for a large-size antenna of a satellite, analyzing a pattern of the large-size antenna after satellite installation by adopting a high-frequency analysis method in an electromagnetic field numerical calculation method;
503. for a platform antenna of a satellite, analyzing a pattern of the satellite-mounted platform antenna by adopting a full-wave analysis method in an electromagnetic field numerical calculation method;
step six, analyzing the isolation degree of the load antenna and the satellite platform antenna;
601. determining a transmitting antenna pattern and a receiving antenna pattern to be analyzed;
602. determining a distance R and a frequency f between a transmitting antenna and a receiving antenna to be analyzed;
603. calculating the isolation degree I of the transmitting antenna and the receiving antenna according to the following steps;
wherein c represents the speed of light; θ and φ are pitch and azimuth angles of the transmit and receive antenna patterns, respectively; g t And G r Gains in the θ and φ directions for the transmit antenna pattern and the receive antenna pattern, respectively;
step seven, analyzing the radiation field intensity of the large-size antenna on the satellite;
701. introducing a large-size antenna model into the satellite model;
702. introducing a near-field equivalent source;
703. analyzing field intensity E generated by SAR antenna on satellite surface by frequency domain analysis method in electromagnetic field numerical calculation method p ；
704. Determining SAR load transmitting power P according to design index of satellite t ；
705. Determining field intensity corresponding to SAR load transmitting power based on the analysis result of the step 703;
wherein E is the field intensity corresponding to SAR load transmitting power.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317085A (en) * | 2017-05-16 | 2017-11-03 | 上海无线电设备研究所 | A kind of foldable expansion film antenna of lens type and its sizing method |
| CN108205089A (en) * | 2017-12-28 | 2018-06-26 | 中国空间技术研究院 | A kind of whole star Electro Magnetic Compatibility verification method and system based on electric propulsion radiation-emitting simulator |
| CN109444571A (en) * | 2018-09-21 | 2019-03-08 | 北京遥测技术研究所 | A kind of small satellite communication load EMC prediction method |
| CN111666682A (en) * | 2020-06-04 | 2020-09-15 | 陕西宛鸣信息科技有限公司 | Design method of ultra-wideband circularly polarized planar reflective array antenna |
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| ES2639687B8 (en) * | 2017-03-03 | 2018-03-07 | Universidad De Oviedo | Airborne system and method for the characterization and measurement of antennas or radiating systems |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317085A (en) * | 2017-05-16 | 2017-11-03 | 上海无线电设备研究所 | A kind of foldable expansion film antenna of lens type and its sizing method |
| CN108205089A (en) * | 2017-12-28 | 2018-06-26 | 中国空间技术研究院 | A kind of whole star Electro Magnetic Compatibility verification method and system based on electric propulsion radiation-emitting simulator |
| CN109444571A (en) * | 2018-09-21 | 2019-03-08 | 北京遥测技术研究所 | A kind of small satellite communication load EMC prediction method |
| CN111666682A (en) * | 2020-06-04 | 2020-09-15 | 陕西宛鸣信息科技有限公司 | Design method of ultra-wideband circularly polarized planar reflective array antenna |
Non-Patent Citations (1)
| Title |
|---|
| 天线平面近场测量的研究(一);叶云裳;《中国空间科学技术》;19860625(第08期);第37-46页 * |
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