Method for realizing low-orbit satellite data return through satellite-ground combination

Abstract

The invention discloses a method for realizing low-orbit satellite data return through satellite-ground combination. The method comprises the following steps: S1, arranging a low-orbit satellite-borne terminal on a low-orbit spacecraft; s2, presetting ephemeris information and orbit and beam information of a high-orbit star; s3, when the related information of the low-orbit satellite or the high-orbit satellite changes, the ground control system uploads update information to the low-orbit satellite; s4, according to the information of S2 and S3, calculating a beam area where the low-orbit satellite is located; s5, the low-orbit satellites select beams to carry out relay backhaul according to self calculation or ground distribution; s6, when the low-orbit satellite-borne terminal is in the service range of the ground data transmission station and the high-orbit beam at the same time, any one or two of the low-orbit satellite-borne terminal can be selected for transmission; s7, calculating Doppler frequency offset and Doppler change rate of the low-orbit star and the high-orbit star; s8, performing Doppler compensation on the transmitted data; and S9, the compensated signal is sent to the high-orbit satellite by the low-orbit satellite-borne terminal and is relayed to a ground system. According to the invention, reliable and stable return of low-orbit satellite data is realized through satellite-ground combination.

Description

Technical Field

[0001] The present invention relates to the field of low-orbit data return, and in particular to a method for realizing low-orbit satellite data return through satellite-ground collaboration. Background Art

[0002] With the development of aerospace technology, low-orbit spacecraft are showing a large-scale constellation development trend. As a global system, it is usually only possible to provide measurement, control and data transmission support through one or more national ground station networks under various constraints on the construction of ground stations overseas, and cannot guarantee the business landing needs during the non-national operation period. Traditional data relay satellites can support real-time data backhaul from low-orbit spacecraft, but the number of links supported at the same time is small, and dedicated relay satellites need to be launched independently, which is relatively expensive. The high-orbit broadband multi-beam communication satellite system has the advantages of large regional capacity and supports many users, and can support low-orbit spacecraft relay data backhaul services. However, the implementation process faces the problem of Doppler frequency deviation and Doppler change rate processing caused by the relative movement of low-orbit satellites and high-orbit satellites. Summary of the invention

[0003] In order to solve the existing problems, the present invention provides a method for realizing low-orbit satellite data backhaul through satellite-ground collaboration. The specific scheme is as follows: A method for realizing low-orbit satellite data backhaul through satellite-ground collaboration comprises the following steps: S1, a low-orbit satellite-borne terminal is equipped on a low-orbit spacecraft, and the low-orbit satellite-borne terminal can receive and forward configuration information from a high-orbit satellite, and can send processed signals to the high-orbit satellite.

[0004] S2, before the low-orbit spacecraft enters orbit, the low-orbit satellite terminal presets the updateable orbital ephemeris information of the low-orbit satellite, and presets the orbit and beam information of the high-orbit satellite that provides relay backhaul service.

[0005] S3: When the relevant information of the low-orbit satellite or the high-orbit satellite changes, the ground control system will update the information to the low-orbit satellite.

[0006] S4, the low-orbit satellite-borne terminal calculates its own beam area in real time on-orbit according to the current on-orbit position of the low-orbit satellite, orbital ephemeris information, beam coverage information of the high-orbit satellite and the information uploaded in step S3.

[0007] S5, the low-orbit satellite selects the beam based on its own calculations or ground allocation to carry out relay backhaul.

[0008] S6: When the low-orbit satellite-borne terminal is within the service range of both the ground data transmission station and the high-orbit beam at the same time, it can choose to transmit unilaterally from either side or transmit in parallel from both sides.

[0009] S7, the low-orbit satellite-borne terminal calculates the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite.

[0010] S8, the low-orbit satellite-borne terminal performs Doppler compensation on the transmitted data at the signal modulation and coding level based on the obtained information on Doppler frequency deviation and Doppler change rate.

[0011] S9, the compensated signal is sent from the low-orbit satellite terminal to the high-orbit satellite and relayed to the ground system.

[0012] Preferably, in step S5, if the low-orbit satellite is in the overlapping coverage area of ​​multiple beams, one or more beams can be selected for relay backhaul based on its own calculations or ground allocation.

[0013] Preferably, in step S7, the low-orbit satellite terminal can calculate the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite in real time on orbit according to the current on-orbit position of the low-orbit satellite, orbital ephemeris information and the frequency resources of the high-orbit beam in use; the ground control system can also calculate and upload the Doppler frequency deviation and Doppler change rate information in stages according to the orbital ephemeris information; in addition, when the satellite terminal is equipped with positioning devices such as GPS and Beidou, the moving direction and speed of the low-orbit satellite can be calculated through continuous positioning solution in a fixed time period, and the Doppler frequency deviation and Doppler change rate information can be solved.

[0014] The present invention also discloses a computer-readable storage medium, on which a computer program is stored. After the computer program is run, any of the above-mentioned methods is executed.

[0015] The present invention also discloses a computer system, including a processor and a storage medium, wherein a computer program is stored on the storage medium, and the processor reads and runs the computer program from the storage medium to execute any of the methods described above.

[0016] The beneficial effects of the present invention are: Through the present invention, the satellite and the ground can jointly realize the high-orbit broadband multi-beam communication satellite system to serve the low-orbit data backhaul, solve the problems of beam selection, Doppler compensation, etc., and can serve more users stably, reliably, efficiently and flexibly at a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1It is the work flow chart of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Existing medium and low-orbit spacecraft often use tracking point beams or regional large beams to relay data back, rarely involving beam selection and switching and other difficult problems. On the other hand, the onboard terminal of low-orbit spacecraft lacks position solution and Doppler calculation capabilities that are not dependent on GPS, Beidou, etc., which is not conducive to robust and reliable relay transmission. At the same time, traditional relay satellite-ground collaboration capabilities are relatively lacking, and the ability to adjust on demand and efficient transmission is insufficient.

[0021] The present invention utilizes multiple service beams of high-orbit broadband multi-beam communication satellites to transmit low-orbit spacecraft relay data in real time. This process can also be coordinated with traditional ground control systems to achieve reliable and stable transmission of low-orbit satellite data through satellite-ground collaboration.

[0022] like Figure 1 A method for realizing low-orbit satellite data backhaul through satellite-ground collaboration comprises the following steps: S1, a low-orbit satellite-borne terminal is equipped on a low-orbit spacecraft, and the low-orbit satellite-borne terminal can receive and forward configuration information from a high-orbit satellite, and can send processed signals to the high-orbit satellite.

[0023] S2, before the low-orbit spacecraft enters orbit, the low-orbit satellite terminal presets the updateable orbital ephemeris information of the low-orbit satellite, and presets the orbit and beam information of the high-orbit satellite that provides relay backhaul service.

[0024] S3: When the relevant information of the low-orbit satellite or the high-orbit satellite changes, the ground control system will update the information to the low-orbit satellite.

[0025] S4, the low-orbit satellite-borne terminal calculates its own beam area in real time on-orbit according to the current on-orbit position of the low-orbit satellite, orbital ephemeris information, beam coverage information of the high-orbit satellite and the information uploaded in step S3.

[0026] S5, the low-orbit satellite selects a beam for relay backhaul based on its own calculations or ground allocation. If the low-orbit satellite is in the overlapping coverage area of ​​multiple beams, it can select one or more beams for relay backhaul based on its own calculations or ground allocation. S6: When the low-orbit satellite-borne terminal is within the service range of both the ground data transmission station and the high-orbit beam at the same time, it can choose to transmit unilaterally from either side or transmit in parallel from both sides.

[0027] S7, the low-orbit satellite-borne terminal calculates the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite.

[0028] Specifically, the low-orbit satellite terminal can calculate the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite in real time on orbit based on the current on-orbit position of the low-orbit satellite, orbital ephemeris information and the frequency resources of the high-orbit beam in use. The ground control system can also calculate and upload the Doppler frequency deviation and Doppler change rate information in stages based on the orbital ephemeris information. In addition, when the satellite terminal is equipped with positioning devices such as GPS and Beidou, the moving direction and speed of the low-orbit satellite can be calculated through continuous positioning and solution in a fixed time period, and then the Doppler frequency deviation and Doppler change rate information can be solved.

[0029] S8, the low-orbit satellite-borne terminal performs Doppler compensation on the transmitted data at the signal modulation and coding level based on the obtained information on Doppler frequency deviation and Doppler change rate.

[0030] S9, the compensated signal is sent from the low-orbit satellite terminal to the high-orbit satellite and relayed to the ground system.

[0031] Through the present invention, the satellite and the ground can jointly realize the high-orbit broadband multi-beam communication satellite system to serve the low-orbit data backhaul, solve the problems of beam selection, Doppler compensation, etc., and can serve more users stably, reliably, efficiently and flexibly at a lower cost.

[0032] The present invention also discloses a computer-readable storage medium, on which a computer program is stored. After the computer program is run, any of the above-mentioned methods is executed.

[0033] The present invention also discloses a computer system, including a processor and a storage medium, wherein a computer program is stored on the storage medium, and the processor reads and runs the computer program from the storage medium to execute any of the methods described above.

[0034] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The technician may implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as resulting in a departure from the scope of the present invention.

[0035] The various illustrative logic blocks, modules, and circuits described in conjunction with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration.

[0036] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0037] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of the medium. Disk and disc as used herein include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disk often reproduces data magnetically, while disc reproduces data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0038] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for realizing low-orbit satellite data backhaul through satellite-ground collaboration, characterized in that: The following steps are involved: S1, equipping a low-orbit satellite-borne terminal on a low-orbit spacecraft, wherein the low-orbit satellite-borne terminal can receive and forward configuration information from a high-orbit satellite, and can send processed signals to the high-orbit satellite; S2, before the low-orbit spacecraft enters orbit, the low-orbit satellite terminal presets the orbital ephemeris information of the low-orbit satellite that can be updated, and presets the orbit and beam information of the high-orbit satellite that provides relay backhaul service; S3, when the relevant information of the low-orbit satellite or the high-orbit satellite changes, the ground control system updates the information to the low-orbit satellite; S4, the low-orbit satellite-borne terminal calculates its own beam area in real time on-orbit according to the current on-orbit position of the low-orbit satellite, orbital ephemeris information, beam coverage information of the high-orbit satellite and the information uploaded in step S3; S5, the low-orbit satellite selects a beam for relay backhaul based on its own calculations or ground allocation; S6: When the low-orbit satellite-borne terminal is within the service range of both the ground data transmission station and the high-orbit beam, it can choose to transmit on either side or transmit on both sides in parallel. S7, the low-orbit satellite-borne terminal calculates the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite; S8, the low-orbit satellite-borne terminal performs Doppler compensation on the transmitted data at the signal modulation and coding level according to the information of Doppler frequency deviation and Doppler change rate obtained; S9, the compensated signal is sent from the low-orbit satellite terminal to the high-orbit satellite and relayed to the ground system.

2. The method according to claim 1, characterized in that: In step S5, if the low-orbit satellite is in the overlapping coverage area of ​​multiple beams, one or more beams can be selected to carry out relay backhaul based on its own calculations or ground allocation.

3. The method according to claim 1, characterized in that: In step S7, the low-orbit satellite terminal can calculate the Doppler frequency deviation and Doppler change rate between itself and the high-orbit satellite in real time on orbit according to the current on-orbit position of the low-orbit satellite, orbital ephemeris information and the frequency resources of the high-orbit beam in use; the ground control system can also calculate and upload the Doppler frequency deviation and Doppler change rate information in stages according to the orbital ephemeris information; in addition, when the satellite terminal is equipped with positioning devices such as GPS and Beidou, it can also calculate the moving direction and speed of the low-orbit satellite through continuous positioning solution in a fixed time period, and then solve the Doppler frequency deviation and Doppler change rate information.

4. A computer-readable storage medium, characterized in that: A computer program is stored on the medium, and after the computer program is run, the method according to any one of claims 1 to 3 is executed.

5. A computer system, characterized in that: The method comprises a processor and a storage medium, wherein a computer program is stored in the storage medium, and the processor reads and runs the computer program from the storage medium to execute the method as claimed in any one of claims 1 to 3.

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