CN115941026A - Satellite-borne device suitable for full-duplex satellite communication - Google Patents
Satellite-borne device suitable for full-duplex satellite communication Download PDFInfo
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- CN115941026A CN115941026A CN202211391930.5A CN202211391930A CN115941026A CN 115941026 A CN115941026 A CN 115941026A CN 202211391930 A CN202211391930 A CN 202211391930A CN 115941026 A CN115941026 A CN 115941026A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a satellite-borne device suitable for full-duplex satellite communication, and belongs to the technical field of satellite-borne carrying of satellite communication. The two ends of the satellite platform are provided with two supporting arms, one transmitting antenna and a plurality of receiving antennas for satellite full-duplex communication are carried at the two ends of each supporting arm, electromagnetic signals of ground nodes are approximately plane waves and vertically incident to the receiving antennas on the supporting arms, and the distances from the receiving antennas to the transmitting antennas meet the requirement that the sum of self-interference signals received by the plurality of receiving antennas is mutually offset. The invention realizes the suppression and the offset of the full-duplex self-interference signal and improves the frequency spectrum efficiency of the full-duplex communication without influencing the directivity of the antenna.
Description
Technical Field
The invention discloses a technical scheme for carrying a satellite-borne antenna applicable to a full-duplex satellite communication scene, relates to a novel satellite-borne antenna carrying device, and belongs to the field of satellite-borne antennas.
Background
Satellite communication is an important method for solving communication signal coverage in remote areas of the world, and can effectively avoid signal blind areas formed by difficult deployment of base stations. The shielding between the communication links of the satellite and the ground receiving node is less, and the signal transmission is not easily interfered. Because the satellite orbit is higher, the area covered by a single satellite during communication is also considerable, and the satellite communication method is an effective scheme for solving the communication problem of a wide area which is not included in a ground communication network area. Full-duplex satellite communication is to eliminate self-interference of a transmitting antenna to a receiving antenna of the own party when the satellite-ground simultaneously performs same-frequency communication by using a full-duplex self-interference elimination technology, so as to realize correct receiving and decoding of effective signals. Compared with the traditional half-duplex satellite communication technology, the frequency spectrum efficiency is improved by 2 times, and the satellite communication capability is enhanced. The existing satellite communication scheme usually considers the half-duplex mode, and pays more attention to factors such as ensuring coverage area, weight and convenience for antenna deployment. The design of the antenna carrying technical scheme does not consider the influence of eliminating simultaneous same-frequency self-interference signals, and is not suitable for full-duplex satellite communication.
Disclosure of Invention
In order to solve the problem of self-interference elimination of a satellite-borne antenna of full-duplex satellite communication, the invention provides a satellite-borne antenna carrying device suitable for full-duplex satellite communication, which ensures the coverage area of a communication satellite while ensuring less interference influence between satellite-borne receiving and transmitting antennas.
The technical solution of the invention is as follows:
the utility model provides a satellite-borne device suitable for full-duplex satellite communication, its characterized in that sets up two support arms at satellite platform both ends, the straight line that two support arms formed and two solar sailboards of satellite platform formed is at the coplanar and perpendicular, carries on a transmitting antenna and a plurality of receiving antenna that are used for satellite full-duplex communication at the both ends of support arm, and the electromagnetic signal approximate plane wave vertical incidence of ground node is to the receiving antenna on the support arm, and the received signal syntropy that all receiving antenna received, the distance of receiving antenna to transmitting antenna satisfies makes the sum of the self-interference signal that a plurality of receiving antenna received offset each other, realizes the suppression to self-interference, expresses as:
wherein d is i (i =1,2, 3.. N) is the distance between the plurality of receiving antennas and the transmitting antenna, λ is the wavelength of the single-frequency signal used for communication, and n is the number of the receiving antennas.
The length of the supporting arm is equal to that of the satellite solar sailboard.
Furthermore, a rotating part is arranged between the supporting arm and the satellite platform, the orientation of the satellite-borne antenna is adjusted through rotation of the supporting arm, and therefore the coverage area of the antenna can be adjusted when the satellite-borne antenna is communicated with a ground node.
Furthermore, since the self-interference path in space only exists in a direct path and a reflection multipath passing through the satellite platform basically, the surface of the supporting arm can be provided with a wave-absorbing material, so that the re-attenuation of the self-interference signal is realized.
Furthermore, the satellite-borne antenna for full-duplex communication adopts a high-gain parabolic antenna or a high-gain microstrip antenna, so that the self-interference signal intensity caused by side lobe leakage is reduced while the high gain of satellite-ground communication is ensured, and the full-duplex communication quality is improved. However, the antenna is large in size, and the supporting arm can overcome the defect of inconvenient installation.
The polarization modes of the transmitting antenna and the receiving antenna are horizontal polarization, vertical polarization or left-hand polarization and right-hand polarization.
According to the invention, because the supporting arm is vertical to the solar sailboard, the solar sailboard receiving energy and the satellite antenna communication are not influenced by the satellite attitude and the orbit position. In order to realize full-duplex communication, the two ends of the supporting arm are far away, the transmitting antenna and the receiving antenna are placed at the two ends of the supporting arm, certain antenna isolation is realized, and the strength of a self-interference signal reaching the receiving antenna through path loss is reduced. Meanwhile, the multi-path content of a communication channel between satellite-borne receiving and transmitting of the antenna fixed on the supporting arm is low, and the antenna is suitable for polarization interference elimination. The polarization mode of the receiving and transmitting antenna can select horizontal polarization, vertical polarization or left-hand polarization and right-hand polarization, and self-interference is eliminated by utilizing the polarization orthogonal characteristic of electromagnetic signals; aiming at the problem of self-interference between satellite-borne transmitting and receiving antennas, the self-interference signal is inhibited by arranging the antennas in the direction which is the same plane as the solar sailboard and is vertical to the plane, and furthest separating the distance between the two antennas. The invention realizes less interference influence between satellite-borne receiving and transmitting antennas, ensures that the orientation of the antennas can be freely changed no matter how the solar sailboard rotates, and ensures the coverage area of a communication satellite. The antenna is arranged in the vertical direction of the solar sailboard, so that the generation of multipath is effectively reduced, and favorable conditions are provided for eliminating interference in an analog domain and a digital domain subsequently.
Compared with the prior art, the invention has the advantages that:
(1) The utility model provides an antenna carrying device suitable for full-duplex satellite communication adds a support arm in perpendicular to solar panel direction and is used for fixed satellite-borne antenna, has pulled open the receiving and dispatching antenna distance, is favorable to full-duplex self-interference to be eliminated. The antenna faces the ground all the time, and the influence on the coverage area and the communication quality when the solar sailboard moves and the satellite attitude changes is avoided.
(2) The technical scheme of the vertical direction supporting arm is adopted, the configurable antenna has high flexibility, and can support multiple full-duplex self-interference elimination and suppression methods such as antenna isolation, high-directivity antennas, small antenna polarization interference and antenna position cancellation.
(3) The invention has simple structure, feasible method and high flexibility.
Drawings
Fig. 1 is a schematic diagram of the invention for realizing satellite-ground full duplex communication.
Wherein: 1. a satellite platform; 2. a solar panel; 3. a support arm; 4. a satellite-borne antenna; 5. a ground antenna;
fig. 2 is a schematic diagram of the position of an antenna according to an embodiment of the present invention.
Detailed Description
The invention will be further described by way of examples, without in any way limiting the scope of the invention, with reference to the accompanying drawings.
The technical key point of full-duplex satellite communication lies in self-interference elimination, as shown in fig. 1, two support arms are arranged at two ends of a satellite platform, a straight line formed by the two support arms and a straight line formed by two solar sailboards of the satellite platform are in the same plane and are vertical to each other, a transmitting antenna and a plurality of receiving antennas used for satellite full-duplex communication are carried at two ends of each support arm, electromagnetic signals of ground nodes are approximately plane waves and vertically incident to the receiving antennas on the support arms, and receiving signals received by all the receiving antennas are in the same direction. The support arm structure can enlarge the selection range of the antenna, is more convenient to install, and supports the adoption of a large-size high-gain parabolic antenna. Meanwhile, as the support arm is almost free of shielding except the antenna, the satellite-borne antenna can be used for respectively adopting left-handed circular polarization and right-handed circular polarization, and the orthogonality of the polarization directions is used for eliminating self-interference. The traditional space-borne antennas are shielded more, and multipath has larger influence on the polarization direction, so that the traditional space-borne antennas are not suitable for a polarization interference elimination method.
When the supporting arm structure is used for carrying the antenna, the transmitting antenna and the receiving antenna can be pulled far as possible, and self-interference signals are eliminated by utilizing path loss generated by antenna isolation. According to the free space loss model, self-interference signals obtained by antenna isolation are suppressed as follows:
Los＝32.44+20lg d(km)+20lg f(MHz)
wherein d represents the distance between the two antennas, and f represents the frequency of the communication signal. Los represents the path loss in dB due to antenna isolation. It can be seen that the antenna isolation attenuates the self-interference signal more as distance and frequency increase. Normally, the frequency of the signal is not changed, and the distance between the transmitting and receiving antennas is increased, so that the attenuation of the self-interference signal is increased. The support arm structure of the invention has large size, and compared with the traditional satellite antenna carrying mode, the self-interference signal suppression effect obtained by antenna isolation is better.
The distance from the receiving antenna to the transmitting antenna is satisfied, so that the sum of self-interference signals received by the multiple receiving antennas is mutually offset, and self-interference suppression is realized, and the self-interference suppression is represented as follows:
the invention takes the example that the Globalstar satellite uses Band n53 (2483.5-2495 MHz) frequency to provide satellite communication service for iphone mobile phone. As shown in fig. 2, it is assumed that one transmitting antenna and two receiving antennas are fixedly disposed on the supporting arm, and the length L =20m at both ends of the supporting arm, the communication frequency is 2.4GHz, and the wavelength λ =12.5cm is set.
When the transmitting antenna is between two receiving antennas, as shown in FIG. 2 (a), d 1 And d 2 The distances from the transmitting antenna to the two receiving antennas respectively satisfy the following conditions:
is equivalent to
Wherein, λ is single-frequency signal wavelength used for communication, k =0,1,2,3 \ 8230and is positive integer. The two receiving antennas are arranged at two ends of the supporting arm, and the position of the transmitting antenna is determined by d 1 And d 2 The decision, expressed as:
let k satisfy the above formula to take a value range of
Setting the path fading from the transmitting antenna to the two receiving antennas as Los 1 And Los 2 Respectively satisfy:
Los 1 ＝32.44+20lg d 1 (km)+20lg f(MHz)
Los 2 ＝32.44+20lg d 2 (km)+20lg f(MHz)
thus, the placement mode that minimizes residual self-interference follows:
the residual self-interference is:
when the transmitting antenna is located on one side of the two receiving antennas, assuming the left side, as shown in FIG. 2 (b), d is 1 And d 2 The distances from the transmitting antenna to the two receiving antennas respectively satisfy the following conditions:
is equivalent to
Wherein, λ is single-frequency signal wavelength used for communication, k =0,1,2,3 \ 8230and is positive integer. The transmitting antenna is arranged at the leftmost end of the supporting arm, one receiving antenna is arranged at the rightmost end of the supporting arm, and the other receiving antenna is arranged at the position d 1 And d 2 The decision, expressed as:
let k satisfy the above formula to take a value range of
Setting the path fading from the transmitting antenna to the two receiving antennas as Los 1 And Los 2 Respectively satisfy:
Los 1 ＝32.44+20lg d 1 (km)+20lg f(MHz)
Los 2 ＝32.44+20lg d 2 (km)+20lg f(MHz)
thus, the placement mode with the minimum residual self-interference follows:
the residual self-interference is:
considering one transmit antenna and two receive antennas, the suppression of self-interference signals by antenna isolation can be achieved as follows:
Los＝32.44+20lg 0.02+20lg(2.4×10 3 )≈66.0648dB
considering a scheme that one transmitting antenna and two receiving antennas cancel based on antenna positions, the suppression of self-interference signals can be achieved as follows:
and finally, by comparing the two schemes, selecting the placement mode with the minimum residual self-interference to configure the satellite-borne antenna on the supporting arm.
It is noted that the disclosed embodiments are intended to aid in further understanding of the invention, and those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims. Those skilled in the art will appreciate that those matters not described in detail in the present specification are not particularly limited to the specific examples described herein.
Claims (6)
1. The utility model provides a satellite-borne antenna loading apparatus suitable for full-duplex satellite communication, its characterized in that sets up two support arms at satellite platform both ends, the straight line that two support arms formed is perpendicular with the straight line that two solar sailboards of satellite platform formed, carries on a transmitting antenna and a plurality of receiving antenna that are used for satellite full-duplex communication on the support arm, and the electromagnetic signal approximate plane wave vertical incidence of ground node is the receiving antenna on the support arm, and the received signal syntropy that all receiving antenna received, the distance from receiving antenna to transmitting antenna satisfies makes the sum of the self-interference signal that a plurality of receiving antenna received offset each other, realizes the suppression to self-interference, expresses as:
wherein d is i (i =1,2,3,. N.) is the distance of the plurality of receiving antennas from the transmitting antenna, respectively, and λ is the wavelength of the single-frequency signal used for communication.
2. The on-board satellite antenna system for full-duplex satellite communications of claim 1, wherein the support arm length is equal to the length of a satellite solar panel.
3. The on-board satellite antenna system suitable for full-duplex satellite communication according to claim 1, wherein a rotation member is provided between the support arm and the satellite platform, and the orientation of the antenna is adjusted by rotation of the support arm.
4. The on-board satellite antenna system suitable for full-duplex satellite communications of claim 1, wherein a wave absorbing material is disposed on a surface of the support arm.
5. The on-board satellite antenna carrier device according to claim 1, wherein the antenna is a high-gain parabolic antenna or a microstrip antenna.
6. The on-board satellite antenna system adapted for full-duplex satellite communication of claim 1, wherein the polarization of the transmitting antenna and the receiving antenna is selected from horizontal polarization, vertical polarization, or left-handed and right-handed polarization.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022112531256 | 2022-10-13 | ||
| CN202211253125 | 2022-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115941026A true CN115941026A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211391930.5A Pending CN115941026A (en) | 2022-10-13 | 2022-11-08 | Satellite-borne device suitable for full-duplex satellite communication |
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| CN (1) | CN115941026A (en) |
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- 2022-11-08 CN CN202211391930.5A patent/CN115941026A/en active Pending
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