A data transmission method and system based on low-orbit satellite

Abstract

The present invention discloses a data transmission method and system based on a low-orbit satellite, the method comprising the following steps: obtaining a request instruction, the request instruction being a request instruction for a resource satellite to transmit data to a ground station; obtaining attribute information of the satellite based on the request instruction; judging the attribute information by using an ephemeris solution method, and when the attribute information meets satellite-to-ground communication conditions, establishing a communication link between the resource satellite, the low-orbit satellite and the ground station; the resource satellite transmitting observation data to the ground station via the communication link; the beneficial effect of the present invention is that by establishing a low-orbit satellite between the resource satellite and the ground station user terminal and transmitting real-time data via the low-orbit satellite, the real-time performance of satellite data transmission is improved, so that the user terminal can obtain real-time satellite data in a timely manner.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a data transmission method and system based on a low-orbit satellite. Background Art

[0002] Existing resource and remote sensing satellites are generally equipped with large storage space. When the ground station and the satellite are invisible and satellite-to-ground communication is impossible, the detected data will be stored on the satellite; when the ground station and the satellite are visible and satellite-to-ground communication is possible, the data stored on the satellite will be sent down through the satellite-to-ground link; after receiving the sent data, it will be sent to the user's integrated management platform for corresponding post-processing.

[0003] Current solutions require large-scale global deployment of data centers to obtain near-real-time data, which is costly and impractical. Resource and remote sensing satellites are categorized into polar and inclined orbits based on their trajectory. For polar-orbiting satellites, ground stations can be built at the poles, allowing the satellites to communicate with the ground stations throughout each orbit. A single station can achieve real-time data transmission for the entire satellite's motion cycle. However, for inclined-orbit satellites, communication with the ground stations is not possible, and a single station cannot transmit data within the entire satellite's motion cycle, resulting in even poorer real-time performance. Preliminary analysis indicates that near the equator, the real-time performance of satellite data is approximately 0.5 days. This relatively poor real-time performance of satellite data cannot meet the needs of some users with demanding real-time data requirements. Consequently, existing satellite communication data transmission methods suffer from poor real-time performance, low transmission volume, and inadequate access to real-time data.

[0004] In view of this, this application is hereby filed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that in the satellite data transmission system of the prior art, the real-time performance of the transmitted satellite data is poor, which makes it impossible for the user end to obtain the real-time satellite data in a timely manner. The purpose of the present invention is to provide a data transmission method and system based on low-orbit satellites, which improves the real-time performance of satellite data transmission and enables the user end to obtain real-time satellite data in a timely manner.

[0006] The present invention is achieved through the following technical solutions:

[0007] A data transmission method based on a low-orbit satellite, the method steps comprising:

[0008] S1: Obtain a request instruction, which is a request instruction for the resource satellite to transmit data to the ground station;

[0009] S2: Based on the request instruction, obtain attribute information of the satellite;

[0010] S3: using an ephemeris calculation method to judge the attribute information, and when the attribute information meets the satellite-to-ground communication conditions, establishing a communication link between the resource satellite, the low-orbit satellite, and the ground station;

[0011] S4: The resource satellite transmits the observation data to the ground station through the communication link.

[0012] In a traditional satellite data transmission system, a ground station is built as a transfer station to transfer data between the ground station and the satellite. However, when using the traditional method to transmit satellite data, the real-time performance of the transmitted satellite data is usually poor, the transmission volume is small, and the user cannot obtain the real-time data in time. The present invention provides a data transmission method based on a low-orbit satellite. By establishing a low-orbit satellite between a resource satellite and a ground station user terminal and transmitting real-time data through the low-orbit satellite, the real-time performance of satellite data transmission is improved, so that the user terminal can obtain real-time satellite data in time.

[0013] Preferably, the sub-step of establishing the communication link includes:

[0014] A: Based on the attribute information, determine whether the attribute information meets the satellite-to-ground communication conditions through an ephemeris calculation method. If so, proceed to step B.

[0015] B: The resource satellite initiates a random access request to the ground station via a broadband data terminal to pair the resource satellite with the ground station;

[0016] C: The communication link is established between the resource satellite and the ground station via the low-orbit satellite.

[0017] Preferably, the data transmission method further includes:

[0018] S5: Determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration. If not, proceed to step S6;

[0019] S6: Splitting the observation data into several data blocks;

[0020] S7: Repeat steps S2 to S4 to transmit several data blocks in sequence.

[0021] Preferably, data transmission is performed between the resource satellite and the low-orbit satellite, and between the low-orbit satellite and the ground station via a broadband data transmission service.

[0022] Preferably, when the attribute information does not meet the satellite-to-ground communication conditions, the attribute information of the low-orbit satellite is updated in real time, and the attribute information is repeatedly judged using the ephemeris solution method until the attribute information meets the satellite-to-ground communication conditions.

[0023] Preferably, the request instruction includes a data transmission request instruction and an address of a ground station that needs to be matched.

[0024] Preferably, the attribute information includes the ephemeris of the low-orbit satellite and the GNSS time and position information of the resource satellite.

[0025] The present invention also provides a data transmission system based on a low-orbit satellite, comprising an instruction acquisition module, an information acquisition module, a processing module, and a link construction module;

[0026] The instruction acquisition module is used to acquire a request instruction, where the request instruction is a request instruction for the resource satellite to transmit data to the ground station;

[0027] The information acquisition module is used to acquire attribute information of the low-orbit satellite based on the request instruction;

[0028] The processing module is configured to determine the attribute information using an ephemeris solution method, and to establish a communication link between the resource satellite, the low-orbit satellite, and the ground station when the attribute information satisfies a satellite-to-ground communication condition;

[0029] The link building module is used for the resource satellite to transmit the observed data to the ground station through the communication link.

[0030] Preferably, the processing module further includes a judgment module, a pairing module and a sub-link construction module;

[0031] The judgment module is configured to judge whether the attribute information meets the satellite-to-ground communication conditions by using an ephemeris calculation method according to the attribute information;

[0032] The pairing module is configured to enable the resource satellite to initiate a random access request to the ground station via a broadband data terminal, thereby pairing the resource satellite with the ground station;

[0033] The sub-link construction module is used to construct the communication link between the resource satellite and the ground station through the low-orbit satellite.

[0034] Preferably, the system further comprises a data transmission module and a data splitting module;

[0035] The data transmission module is used to determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration;

[0036] The data splitting module is used to split the observation data into several data blocks and transmit the data blocks to the link construction module.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] An embodiment of the present invention provides a low-orbit satellite-based data transmission method and system. By establishing a low-orbit satellite between a resource satellite and a ground station user terminal and transmitting real-time data through the low-orbit satellite, the real-time performance of satellite data transmission is improved, so that the user terminal can obtain real-time satellite data in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without making any creative efforts.

[0040] Figure 1 Schematic diagram of data transmission method;

[0041] Figure 2 This is a flow chart of the data transmission method;

[0042] Figure 3 Schematic diagram of the satellite system. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0044] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0045] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0047] Example 1

[0048] In traditional satellite data transmission systems, ground stations are built as transfer stations to transfer data between the ground station and the satellite. However, when using traditional methods to transmit satellite data, the real-time performance of the transmitted satellite data is usually poor, the transmission volume is small, and users are unable to obtain real-time data in a timely manner.

[0049] This embodiment discloses a data transmission method based on a low-orbit satellite. By establishing a low-orbit satellite between a resource satellite and a ground station user terminal, and transmitting real-time data through the low-orbit satellite, the real-time performance of satellite data transmission is improved, so that the user terminal can obtain real-time satellite data in a timely manner. The method disclosed in this embodiment is as follows: Figures 1 to 3 As shown, the method steps include:

[0050] S1: Obtain a request instruction, which is a request instruction for the resource satellite to transmit data to the ground station; the request instruction includes a request instruction for data transmission and an address of the ground station that needs to be matched.

[0051] In step S1, when the resource satellite observes relevant data and needs to transmit the data to the ground station, it needs to initiate an instruction to request data transmission. The transmission instruction includes the address that needs to be sent to the specific ground station. This address is the main address used to establish a communication link with the ground station.

[0052] S2: Based on the request instruction, obtain attribute information of the satellite; the attribute information includes the ephemeris of the low-orbit satellite and the GNSS time and position information of the resource satellite.

[0053] When a resource satellite issues a request command to transmit data, it needs to connect with the corresponding low-orbit satellite. However, before connecting with the low-orbit satellite, it is also necessary to obtain the ephemeris of the relevant low-orbit satellite and the GNSS time and position information of the resource satellite to determine whether the low-orbit satellite meets the conditions for establishing a communication link.

[0054] S3: using an ephemeris calculation method to judge the attribute information, and when the attribute information meets the satellite-to-ground communication conditions, establishing a communication link between the resource satellite, the low-orbit satellite, and the ground station;

[0055] The sub-steps of establishing the communication link include:

[0056] A: Based on the attribute information, determine whether the attribute information meets the satellite-to-ground communication conditions through an ephemeris calculation method. If so, proceed to step B.

[0057] B: The resource satellite initiates a random access request to the ground station via a broadband data terminal to pair the resource satellite with the ground station;

[0058] C: The communication link is established between the resource satellite and the ground station via the low-orbit satellite.

[0059] When the attribute information does not meet the satellite-to-ground communication conditions, the attribute information of the low-orbit satellite is updated in real time, and the attribute information is repeatedly judged using the ephemeris solution method until the attribute information meets the satellite-to-ground communication conditions.

[0060] In step S3, the acquired low-orbit satellite attribute information is judged to determine whether the low-orbit satellite meets the satellite-to-ground communication conditions. If so, a communication link can be established to transmit relevant satellite data.

[0061] S4: The resource satellite transmits the observation data to the ground station through the communication link, and data transmission is performed between the resource satellite and the low-orbit satellite, and between the low-orbit satellite and the ground station via broadband data transmission service.

[0062] Once the communication link is built, a broadband data transmission service connection is formed between the resource satellite and the low-orbit satellite, and a broadband data transmission service connection is also formed between the low-orbit satellite and the ground station, forming a communication link from the resource satellite to the low-orbit satellite and then to the ground station, which can realize real-time transmission of data observed by the resource satellite.

[0063] After establishing a communication link, because the low-orbit satellite is in continuous operation in orbit, and there are signals in some places and no signals in others, when there is no signal, the established communication link will be interrupted and data transmission will be stopped. When it stops, it is necessary to determine whether the observation data has been transmitted. If not, the data needs to be split into data blocks. When the low-orbit satellite has a signal next time, the link will be re-established and the data will be transmitted in the form of data blocks. Specifically:

[0064] S5: Determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration. If not, proceed to step S6;

[0065] S6: Splitting the observation data into several data blocks;

[0066] S7: Repeat steps S2 to S4 to transmit the plurality of data blocks in sequence until all the collected observation data are transmitted.

[0067] This embodiment discloses a data transmission method and system based on low-orbit satellites. By equipping resource and remote sensing satellites with broadband data terminals, data transmission functions based on a low-orbit constellation system are realized, and a communication system between resource and remote sensing satellites and low-orbit satellites is established. This enriches the transmission paths for resource and remote sensing satellite data; improves the real-time performance of the data; reduces the requirements for dedicated ground stations for data transmission; and can provide a wider range of data transmission services.

[0068] Example 2

[0069] This embodiment discloses a data transmission system based on a low-orbit satellite. This embodiment is to implement the transmission method as described in the first embodiment, and includes an instruction acquisition module, an information acquisition module, a processing module, and a link construction module.

[0070] The instruction acquisition module is used to acquire a request instruction, where the request instruction is a request instruction for the resource satellite to transmit data to the ground station;

[0071] The information acquisition module is used to acquire attribute information of the low-orbit satellite based on the request instruction;

[0072] The processing module is configured to determine the attribute information using an ephemeris solution method, and to establish a communication link between the resource satellite, the low-orbit satellite, and the ground station when the attribute information satisfies a satellite-to-ground communication condition;

[0073] The link building module is used for the resource satellite to transmit the observed data to the ground station through the communication link.

[0074] The processing module also includes a judgment module, a pairing module and a sub-link construction module;

[0075] The judgment module is configured to judge whether the attribute information meets the satellite-to-ground communication conditions by using an ephemeris calculation method according to the attribute information;

[0076] The pairing module is configured to enable the resource satellite to initiate a random access request to the ground station via a broadband data terminal, thereby pairing the resource satellite with the ground station;

[0077] The sub-link construction module is used to construct the communication link between the resource satellite and the ground station through the low-orbit satellite.

[0078] The system also includes a data transmission module and a data splitting module;

[0079] The data transmission module is used to determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration;

[0080] The data splitting module is used to split the observation data into several data blocks and transmit the data blocks to the link construction module.

[0081] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A data transmission method based on a low-orbit satellite, characterized in that: The method steps include: S1: Obtain a request instruction, which is a request instruction for the resource satellite to transmit data to the ground station; S2: Based on the request instruction, obtain attribute information of the satellite; S3: using an ephemeris calculation method to judge the attribute information, and when the attribute information meets the satellite-to-ground communication conditions, establishing a communication link between the resource satellite, the low-orbit satellite, and the ground station; The sub-steps of establishing the communication link include: A: Based on the attribute information, determine whether the attribute information meets the satellite-to-ground communication condition by using an ephemeris solution method. If the attribute information does not meet the satellite-to-ground communication condition, update the attribute information of the low-orbit satellite in real time and repeatedly determine the attribute information by using the ephemeris solution method until the attribute information meets the satellite-to-ground communication condition. If so, proceed to step B. B: The resource satellite initiates a random access request to the ground station via a broadband data terminal to pair the resource satellite with the ground station; C: The communication link is established between the resource satellite and the ground station via the low-orbit satellite; S4: The resource satellite transmits the observation data to the ground station via the communication link; Data is transmitted between the resource satellite and the low-orbit satellite, and between the low-orbit satellite and the ground station via a broadband data transmission service, thereby forming a communication link from the resource satellite to the low-orbit satellite and then to the ground station; The data transmission method further includes: S5: Determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration. If not, proceed to step S6; S6: Splitting the observation data into several data blocks; S7: Repeat steps S2 to S4 to transmit several data blocks in sequence.

2. The data transmission method based on a low-orbit satellite according to claim 1, characterized in that: When the attribute information does not meet the satellite-to-ground communication conditions, the attribute information of the low-orbit satellite is updated in real time, and the attribute information is repeatedly judged using the ephemeris solution method until the attribute information meets the satellite-to-ground communication conditions.

3. The data transmission method based on a low-orbit satellite according to claim 1, characterized in that: The request instruction includes a data transmission request instruction and an address of a ground station that needs to be matched.

4. The data transmission method based on a low-orbit satellite according to claim 1, characterized in that: The attribute information includes the ephemeris of the low-orbit satellite and the GNSS time and position information of the resource satellite.

5. A data transmission system based on a low-orbit satellite, characterized in that: It includes an instruction acquisition module, an information acquisition module, a processing module and a link construction module; The instruction acquisition module is used to acquire a request instruction, where the request instruction is a request instruction for the resource satellite to transmit data to the ground station; The information acquisition module is used to acquire attribute information of the low-orbit satellite based on the request instruction; The processing module is configured to determine the attribute information using an ephemeris solution method, and to establish a communication link between the resource satellite, the low-orbit satellite, and the ground station when the attribute information satisfies a satellite-to-ground communication condition; The link construction module is configured to transmit the observed data by the resource satellite to the ground station via the communication link; data is transmitted between the resource satellite and the low-orbit satellite, and between the low-orbit satellite and the ground station, via a broadband data transmission service, thereby forming a communication link from the resource satellite to the low-orbit satellite and then to the ground station; The processing module also includes a judgment module, a pairing module and a sub-link construction module; The judgment module is configured to judge whether the attribute information meets the satellite-to-ground communication conditions by using an ephemeris calculation method according to the attribute information; The pairing module is configured to enable the resource satellite to initiate a random access request to the ground station via a broadband data terminal, thereby pairing the resource satellite with the ground station; The sub-link construction module is used to construct the communication link between the resource satellite and the ground station via the low-orbit satellite; The system also includes a data transmission module and a data splitting module; The data transmission module is used to determine the duration of the low-orbit satellite's presence in the communication link and whether the observation data has been transmitted within the duration; The data splitting module is used to split the observation data into several data blocks and transmit the data blocks to the link construction module.

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