A bistatic relay transmission integrated satellite-ground data transmission system

Abstract

The application relates to a satellite-ground integrated data transmission system of a double-station relay transmission, which comprises a satellite data transmission system and a ground receiving system; the satellite data transmission system comprises a data transmission control unit, a data processing unit, a data storage unit and a satellite data transmission antenna unit; the ground receiving system comprises a ground receiving antenna unit, a ground data preprocessing unit, a ground real-time data processing unit and a ground delay data processing unit. When data is grouped in an AOS frame, the data processing unit of the application marks the data with a real transmission playback mark and a relay mark, and the data is stored in the data storage unit according to the current position information of the satellite. After the data is read back from the satellite data transmission system to the ground receiving system, the ground data preprocessing unit divides the received data according to the real transmission playback mark and the relay mark in the AOS frame, so that complete and detailed real-time data can be obtained most quickly, and the problem that complete real-time data cannot be obtained most quickly due to the interruption of the signal received by the ground station can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of data transmission, specifically to a dual-station relay transmission integrated satellite-ground data transmission system. Background Technology

[0002] Space activities play an important role in disaster prevention and relief, scientific research, economic development, and national defense. Artificial satellites, space stations, and launch vehicles are all supporting equipment for space activities. Among them, artificial satellites have relatively mature and wide applications, such as taking photographic images of the ground terrain, investigating resources, and monitoring the Earth's climate and pollution.

[0003] One type of artificial satellite is specifically designed for tracking geological disasters. When a disaster occurs, the ground often needs to obtain detailed information about the location of the geological disaster as quickly as possible. For example, after a strong earthquake, the situation in the affected area becomes particularly complex. Ground transportation and communication are disrupted, making it impossible for the outside world to quickly obtain detailed information about the affected area, thus lacking a basis for organizing targeted rescue efforts.

[0004] Currently, satellites in actual use in orbit have the following shortcomings: Due to the angle limitations of ground receiving stations in capturing satellite signals, it is inevitable to switch ground receiving stations during satellite transmission in orbit. During the process of switching the direction of the satellite antenna (from ground receiving station A to ground receiving station B), the ground station will lose the ability to capture the downlink signal from the satellite for a short period of time, which will result in the interruption of the data directly transmitted from the satellite to the ground station. The missing data may be critical information that the ground urgently needs. Summary of the Invention

[0005] In order to overcome at least one of the shortcomings of the prior art, this application provides a dual-station relay transmission integrated satellite-ground data transmission system.

[0006] In one embodiment, the dual-station relay transmission integrated satellite-ground data transmission system includes: a satellite data transmission system and a ground receiving system; the satellite data transmission system includes a data transmission control unit, a data processing unit, a data storage unit, and a satellite data transmission antenna unit, and the ground receiving system includes a ground receiving antenna unit, a ground data preprocessing unit, a ground real-time data processing unit, and a ground delayed data processing unit; The data transmission control unit controls the data processing unit, data storage unit, and satellite data transmission antenna unit. The data processing unit includes a data receiving module, a data processing module, a data multiplexing module, and a data transmitting module. The data receiving module receives satellite payload data. The data processing module assembles AOS frames from the satellite payload data. Each AOS frame includes an AOS synchronization header, a VCDU master header, and a VCDU data unit. The VCDU master header includes a live transmission playback identifier and a relay identifier. The live transmission playback identifier includes 0 and 1, where 0 represents the live transmission identifier and 1 represents the playback identifier. The relay identifier also includes 0 and 1, where 0 represents a non-dual-station relay identifier and 1 represents a dual-station relay identifier. The processed data is then transmitted to the data storage unit via the data multiplexing module. The data multiplexing module receives the data returned from the data storage unit, performs mixed multiplexing on the data, and then transmits it to the satellite data transmission antenna unit via the data transmitting module for transmission to the ground receiving system. The data storage unit includes a data processing and recording module, a data scheduling and control module, a data playback module, and a data storage array. After receiving data from the data processing unit, the data processing and recording module schedules and forwards the data to the data storage array through the data scheduling and control module. The data is stored in the data storage array according to the current satellite position information. The data scheduling and control module reads the data from different storage locations in the data storage array and reads it back to the data multiplexing module of the data processing unit through the data playback module. After receiving the data, the ground receiving antenna unit splits the received data into files according to the real-time transmission playback identifier, and sends the split data to the ground real-time data processing unit and the ground delayed data processing unit respectively. The ground delayed data processing unit splits the data into data in the common storage area of ​​the data storage array and data in the special storage area of ​​the data storage array according to the relay identifier, and then transmits the data in the special storage area of ​​the data storage array to the ground real-time data processing unit. The ground real-time data processing unit splices the data into complete real-time transmission data from satellite position A to satellite position E. Satellite position A is the starting point of the line of sight of ground station A, and satellite position E is the ending point of the line of sight of ground station B. Ground station A and ground station B are two adjacent ground stations.

[0007] In one embodiment, when the satellite is not within the line of sight of ground station A, when the data processing module groups AOS frames, it groups the frames according to playback identifier 1 and non-dual-station relay identifier 0; and transmits the data to the data multiplexing module through the recording link. After receiving the data, the data multiplexing module forwards the data to the data storage unit, where it is received by the data processing and recording module. Under the control of the data scheduling and control module, the data is sent to the commonly used storage area of ​​the data storage array.

[0008] In one embodiment, when the satellite enters the line of sight of ground station A, i.e., when it is located at satellite position A, the data transmission control unit sends instructions to the data processing unit, data storage unit and satellite data transmission antenna unit according to the current position of the satellite. The satellite data transmission antenna unit points to ground station A according to instructions; the data processing module copies the received data into two copies, one of which is processed according to the recording procedure when the satellite is not within the line of sight of the ground station; the other copy is framed according to the real transmission identifier 0 and the non-dual-station relay identifier 0, and then the data is transmitted to the data multiplexing module through the real transmission link; at the same time, the data storage unit reads the data from the common storage area of ​​the data storage array according to instructions and plays it back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the playback data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground to ground station A.

[0009] In one embodiment, when the satellite is at the end of the line of sight of ground station A, the data storage unit copies the data currently transmitted from the recording link into two copies according to the instructions sent by the data transmission control unit. One copy is recorded in a special storage area of ​​the data storage array, and the other copy is recorded in the common storage area of ​​the data storage array. When playing back the data, the special storage area has a higher priority than the common storage area. Then, the data storage unit stops playing back the data, and the data processing module of the data processing unit stops transmitting the data to the data multiplexing module through the real transmission link. The satellite data transmission antenna unit switches its pointing from ground station A to ground station B according to the instructions.

[0010] In one embodiment, when the satellite is located at the starting point of the line of sight of ground station B, the data transmission control unit will send instructions to the data processing unit, data storage unit and satellite data transmission antenna unit according to the current position of the satellite. The data processing module copies the received data into two copies. One copy is processed according to the recording procedure when the satellite is not within the line of sight of the ground station. The other copy is framed according to the real transmission identifier 0 and the non-dual-station relay identifier 0, and then the data is transmitted to the data multiplexing module through the real transmission link. At the same time, the data storage unit reads the data from the special storage area of ​​the data storage array according to the instructions and changes the relay identifier in the data format to 1. After all the data in the special storage area of ​​the data storage array is read out and played back to the data multiplexing module, the data is read out from the common storage area of ​​the data storage array and played back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the played-back data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground station B.

[0011] Compared to existing technologies, this application offers the following advantages: In the dual-station relay transmission integrated satellite-ground data transmission system of this application, the data processing unit marks the data with a real-time playback identifier and a relay identifier when forming AOS frames, and stores the data in different regions in the data storage unit based on the satellite's current position information. After being read back from the satellite data transmission system to the ground receiving system, the ground data preprocessing unit decomposes the received data according to the real-time playback identifier and relay identifier in the AOS frame, thereby obtaining complete and detailed real-time data most quickly and effectively avoiding the problem of not being able to obtain complete real-time data quickly due to ground station signal interruption. Attached Figure Description

[0012] This application can be better understood by referring to the description given below in conjunction with the accompanying drawings, which, together with the detailed description below, are incorporated in and form part of this specification. In the drawings: Figure 1 A schematic diagram showing a satellite flying over two adjacent ground stations is provided. Figure 2 A structural block diagram of a dual-station relay transmission integrated satellite-ground data transmission system is shown. Figure 3 A schematic diagram of a group of AOS frames is shown; Figure 4 This diagram illustrates the data transmission process when the satellite is not within the line of sight of ground station A. Figure 5 A schematic diagram of the data transmission process is shown when the satellite enters the line of sight of ground station A; Figure 6 This diagram illustrates the data transmission process between the end of the visible range of ground station A and the beginning of the visible range of ground station B when the satellite is located. Figure 7 The diagram illustrates the data transmission flow when the satellite is located at the starting point of the line of sight of ground station B. Detailed Implementation

[0013] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of the actual embodiments are described in the specification. However, it should be understood that many embodiment-specific decisions can be made in the development of any such actual embodiment to achieve the developer’s specific objectives, and these decisions may vary as the embodiments differ.

[0014] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the device structure closely related to the solution of this application is shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0015] It should be understood that this application is not limited to the described embodiments by virtue of the following description with reference to the accompanying drawings. In this document, embodiments may be combined with each other, features may be substituted or borrowed between different embodiments, and one or more features may be omitted in one embodiment, where feasible.

[0016] This application provides a dual-station relay transmission integrated satellite-ground data transmission system, suitable for scenarios where a satellite flies over two adjacent ground stations. Figure 1 The diagram illustrates a scenario where a satellite flies over two adjacent ground stations. Ground stations A and B are two adjacent ground stations. In scenario one, the visible range of ground station A is from position A to position C, and the visible range of ground station B is from position B to position E. In scenario two, the visible range of ground station A is from position A to position C, and the visible range of ground station B is from position D to position E. To ensure that the following text descriptions apply to both scenarios, position B is not present in scenario two.

[0017] Figure 2 A block diagram of a dual-station relay transmission integrated satellite-ground data transmission system is shown. (See attached diagram) Figure 2 The dual-station relay transmission integrated satellite-ground data transmission system includes: a satellite data transmission system and a ground receiving system; the satellite data transmission system includes a data transmission control unit, a data processing unit, a data storage unit, and a satellite data transmission antenna unit, and the ground receiving system includes a ground receiving antenna unit, a ground data preprocessing unit, a ground real-time data processing unit, and a ground delayed data processing unit.

[0018] The data transmission control unit controls the data processing unit, data storage unit, and satellite data transmission antenna unit. The data processing unit includes a data receiving module, a data processing module, a data multiplexing module, and a data transmitting module; the data receiving module receives satellite payload data, and the data processing module processes the satellite payload data into AOS frames. Figure 3 A schematic diagram of a group AOS frame is shown. The group AOS frame includes a group AOS synchronization header, a group VCDU master header, and a group VCDU data unit. The group VCDU master header includes a live transmission playback identifier and a relay identifier. The live transmission playback identifier includes 0 and 1, where 0 represents the live transmission identifier and 1 represents the playback identifier. The relay identifier also includes 0 and 1, where 0 represents a non-dual-station relay identifier and 1 represents a dual-station relay identifier. The processed data is then sent to the data storage unit via the data multiplexing module. The data multiplexing module receives the data returned from the data storage unit, performs mixed multiplexing on the data, and then sends it to the satellite data transmission antenna unit via the data transmission module for transmission to the ground receiving system. The data storage unit includes a data processing and recording module, a data scheduling and control module, a data playback module, and a data storage array. After receiving data from the data processing unit, the data processing and recording module schedules and forwards the data to the data storage array through the data scheduling and control module. The data is stored in the data storage array according to the current satellite position information. The data scheduling and control module reads the data from different storage locations in the data storage array and reads it back to the data multiplexing module of the data processing unit through the data playback module. After receiving the data, the ground receiving antenna unit splits the received data into files according to the real-time transmission playback identifier, and sends the split data to the ground real-time data processing unit and the ground delayed data processing unit respectively. The ground delayed data processing unit splits the data into data in the common storage area of ​​the data storage array and data in the special storage area of ​​the data storage array according to the relay identifier, and then transmits the data in the special storage area of ​​the data storage array to the ground real-time data processing unit. The ground real-time data processing unit splices the data into complete real-time transmission data from satellite position A to satellite position E, where satellite position A is the starting point of the line of sight of ground station A and satellite position E is the ending point of the line of sight of ground station B.

[0019] Here, data with a real-time playback identifier of 0 is sent to the ground real-time data processing unit, and data with a real-time playback identifier of 1 is sent to the ground delayed data processing unit.

[0020] This embodiment connects the data processing unit and data storage unit of the satellite data transmission system. After the data receiving module of the data processing unit receives the payload data, it immediately copies it into two copies. One copy is directly transmitted to the ground station, and the other copy is transmitted to the data storage unit for storage, to be downloaded to the ground station at an opportune time. Because the ground station may briefly lose its ability to capture the satellite's downlink signal during the satellite antenna switching process, this can lead to interruptions in the data transmitted directly from the satellite to the ground station. In this embodiment, before the satellite leaves ground station A, the data transmission system first stores the directly transmitted data in the data storage unit, which then marks it with a relay identifier and increases its playback priority. After the satellite signal switches to ground station B, the data storage unit, according to the playback priority, first replays the data with the relay identifier to ground station B, and then replays the data in the data storage unit in the original playback order. During reverse processing, the ground can quickly recover the complete and continuous real-time downlink data based on the relay identifier. This avoids the situation where the real-time satellite data received by the ground cannot be continuously transmitted due to the switching of ground receiving stations during the satellite downlink process.

[0021] In one embodiment, Figure 4The diagram illustrates the data transmission process when the satellite is not within the line of sight of ground station A. When the satellite is not within the line of sight of ground station A, the data processing module groups AOS frames according to playback identifier 1 and non-dual-station relay identifier 0; the data is then transmitted to the data multiplexing module through the recording link. After receiving the data, the data multiplexing module forwards the data to the data storage unit, where it is received by the data processing and recording module. Under the control of the data scheduling and control module, the data is sent to the commonly used storage area of ​​the data storage array.

[0022] In one embodiment, Figure 5 The diagram illustrates the data transmission process when a satellite enters the line of sight of ground station A. When the satellite enters the line of sight of ground station A, i.e., it is located at satellite position A, the data transmission control unit sends instructions to the data processing unit, data storage unit, and satellite data transmission antenna unit based on the current satellite position. The satellite data transmission antenna unit points to ground station A according to instructions; the data processing module copies the received data into two copies, one of which is processed according to the recording procedure when the satellite is not within the line of sight of the ground station; the other copy is framed according to the real transmission identifier 0 and the non-dual-station relay identifier 0, and then the data is transmitted to the data multiplexing module through the real transmission link; at the same time, the data storage unit reads the data from the common storage area of ​​the data storage array according to instructions and plays it back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the playback data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground to ground station A.

[0023] In one embodiment, Figure 6 The diagram illustrates the data transmission process between the end of the visible range of ground station A and the beginning of the visible range of ground station B when the satellite is at the end of the visible range of ground station A. When the satellite is at the end of the visible range of ground station A, the data storage unit copies the data currently transmitted from the recording link into two copies according to the instructions sent by the data transmission control unit. One copy is recorded in a special storage area of ​​the data storage array, and the other copy is recorded in the commonly used storage area of ​​the data storage array. When playing back the data, the special storage area has a higher priority than the commonly used storage area. Then, the data storage unit stops playing back the data, and the data processing module of the data processing unit stops transmitting the data to the data multiplexing module through the real transmission link. The satellite data transmission antenna unit switches its pointing from ground station A to ground station B according to the instructions.

[0024] In one embodiment, Figure 7 The diagram illustrates the data transmission process when the satellite is located at the starting point of the visible range of ground station B. When the satellite is located at the starting point of the visible range of ground station B, i.e., satellite position D, the data transmission control unit will send instructions to the data processing unit, data storage unit, and satellite data transmission antenna unit based on the current satellite position. The data processing module copies the received data into two copies. One copy is processed according to the recording procedure when the satellite is not within the line of sight of the ground station. The other copy is framed according to the real transmission identifier 0 and the non-dual-station relay identifier 0, and then the data is transmitted to the data multiplexing module through the real transmission link. At the same time, the data storage unit reads the data from the special storage area of ​​the data storage array according to the instructions and changes the relay identifier in the data format to 1. After all the data in the special storage area of ​​the data storage array is read out and played back to the data multiplexing module, the data is read out from the common storage area of ​​the data storage array and played back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the played-back data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground station B.

[0025] In summary, the dual-station relay transmission integrated satellite-ground data transmission system of this application, in which the data processing unit marks the data with a live transmission playback identifier and a relay identifier when forming AOS frames, and stores the data in regions according to the current satellite position information in the data storage unit. After being read back from the satellite data transmission system to the ground receiving system, the ground data preprocessing unit decomposes the received data according to the live transmission playback identifier and relay identifier in the AOS frame, thereby obtaining complete and detailed real-time data as quickly as possible, effectively avoiding the problem of not being able to obtain complete real-time data as quickly as possible due to the interruption of the ground station's receiving signal.

[0026] The above descriptions are merely various embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-station relay transmission integrated satellite-ground data transmission system, characterized in that, include: The satellite data transmission system includes a satellite data transmission control unit, a data processing unit, a data storage unit, and a satellite data transmission antenna unit; the ground receiving system includes a ground receiving antenna unit, a ground data preprocessing unit, a ground real-time data processing unit, and a ground delayed data processing unit. The data transmission control unit controls the data processing unit, the data storage unit, and the satellite data transmission antenna unit. The data processing unit includes a data receiving module, a data processing module, a data multiplexing module, and a data transmitting module. The data receiving module receives satellite payload data. The data processing module processes the satellite payload data into AOS frames, each AOS frame including an AOS synchronization header, a VCDU master header, and a VCDU data unit. The VCDU master header includes a live transmission playback identifier and a relay identifier. The live transmission playback identifier includes 0 and 1, where 0 represents the live transmission identifier and 1 represents the playback identifier. The relay identifier also includes 0 and 1, where 0 represents a non-dual-station relay identifier and 1 represents a dual-station relay identifier. The processed data is then transmitted to the data storage unit via the data multiplexing module. The data multiplexing module receives data returned from the data storage unit, performs mixed multiplexing on the data, and then transmits it to the satellite data transmission antenna unit via the data transmitting module for transmission to the ground receiving system. The data storage unit includes a data processing and recording module, a data scheduling and control module, a data playback module, and a data storage array. After receiving data from the data processing unit, the data processing and recording module schedules and forwards the data to the data storage array through the data scheduling and control module. The data is stored in the data storage array according to the current satellite position information. The data scheduling and control module reads data from different storage locations in the data storage array and reads it back to the data multiplexing module of the data processing unit through the data playback module. After receiving the data, the ground receiving antenna unit splits the received data into files according to the real-time transmission playback identifier, and sends the split data to the ground real-time data processing unit and the ground delay data processing unit respectively. The ground delay data processing unit splits the data into data in the common storage area of ​​the data storage array and data in the special storage area of ​​the data storage array according to the relay identifier, and then transmits the data in the special storage area of ​​the data storage array to the ground real-time data processing unit. The ground real-time data processing unit splices the data into complete real-time transmission data from satellite position A to satellite position E. Satellite position A is the starting point of the visible range of ground station A, and satellite position E is the ending point of the visible range of ground station B. Ground station A and ground station B are two adjacent ground stations.

2. The system as described in claim 1, characterized in that, When the satellite is not within the line of sight of ground station A, the data processing module groups AOS frames according to playback identifier 1 and non-dual-station relay identifier 0. The data is transmitted to the data multiplexing module via the recording link; After receiving the data, the data multiplexing module forwards the data to the data storage unit, where it is received by the data processing and recording module. Under the control of the data scheduling and control module, the data is sent to the commonly used storage area of ​​the data storage array.

3. The system as described in claim 1, characterized in that, When the satellite enters the line of sight of ground station A, that is, when it is located at satellite position A, the data transmission control unit sends instructions to the data processing unit, data storage unit and satellite data transmission antenna unit according to the current position of the satellite. The satellite data transmission antenna unit points to ground station A according to the instructions; The data processing module copies the received data into two copies. One copy is processed according to the recording procedure when the satellite is not within the line of sight of the ground station. The other copy is framed according to the real transmission identifier 0 and the non-dual-station relay identifier 0. The data is then transmitted to the data multiplexing module through the real transmission link. At the same time, the data storage unit reads the data from the common storage area of ​​the data storage array according to the instructions and plays it back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the playback data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground station A.

4. The system as described in claim 1, characterized in that, When the satellite is at the end of the line of sight of ground station A, the data storage unit copies the data currently transmitted from the recording link into two copies according to the instructions sent by the data transmission control unit. One copy is recorded in the special storage area of ​​the data storage array, and the other copy is recorded in the common storage area of ​​the data storage array. When playing back the data, the special storage area has higher priority than the common storage area. Then, the data storage unit stops playing back the data, and the data processing module of the data processing unit stops transmitting the data to the data multiplexing module through the real transmission link. The satellite data transmission antenna unit switches its pointing from ground station A to ground station B according to the instruction.

5. The system as described in claim 1, characterized in that, When the satellite is located at the starting point of the line of sight of ground station B, the data transmission control unit will send instructions to the data processing unit, data storage unit and satellite data transmission antenna unit according to the current position of the satellite. The data processing module copies the received data into two copies, one of which is processed according to the recording procedure when the satellite is not within the line of sight of the ground station; Another frame is created according to the real transmission identifier 0 and the non-dual-station relay identifier 0, and then the data is transmitted to the data multiplexing module through the real transmission link. At the same time, the data storage unit reads the data from the special storage area of ​​the data storage array according to the instructions and changes the relay identifier in the data format to 1. After all the data in the special storage area of ​​the data storage array is read out and played back to the data multiplexing module, the data is read out from the common storage area of ​​the data storage array and played back to the data multiplexing module. The data multiplexing module mixes the real transmission data and the played-back data and forwards the mixed data to the satellite data transmission antenna unit. The satellite data transmission antenna unit transmits the data to the ground station B.

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