Low-orbit spacecraft measurement and control method and system based on high-orbit mobile communication satellite

Abstract

The embodiment of the present invention proposes a low-orbit spacecraft measurement and control method and system based on a high-orbit mobile communication satellite, which relates to the field of satellite communication measurement and control technology. The method is applied to a low-orbit spacecraft measurement and control system, which includes a high-orbit mobile communication satellite, a relay terminal, a gateway station and a measurement and control service platform. The relay terminal, the high-orbit mobile communication satellite, the gateway station and the measurement and control service platform are sequentially connected in communication. The relay terminal is installed on the low-orbit spacecraft and is connected in communication with the low-orbit spacecraft. The method includes: the measurement and control service platform sends remote control data to the relay terminal through the gateway station and the high-orbit mobile communication satellite; the relay terminal sends the remote control data to the low-orbit spacecraft; the relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway station. It can solve the current and future problems of the lack of on-orbit measurement and control resources for massive low-orbit spacecraft.

Description

Technical Field

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

[0002] With the vigorous development of the aerospace industry, more and more near-Earth satellites are planned to enter space, from hundreds of remote sensing satellite constellations to tens of thousands of interconnected satellite constellations. These satellites will bring huge measurement and control needs. If we still rely on the traditional ground-based measurement and control concept, we need to build a large number of ground measurement and control stations distributed around the world. Considering that space-based measurement and control has high coverage characteristics and multi-target service capabilities, using on-orbit relay satellites or other satellites with relay satellite capabilities to meet these needs can reduce the construction investment of ground stations, improve efficiency and give full play to the capabilities of existing satellites.

[0003] The existing geosynchronous relay satellite system is designed to provide measurement, control and data relay services for a small number of near-Earth satellites and spacecraft with high speed requirements. It mainly relies on large-aperture antennas for point-to-point services on the satellite. Even if there is a certain multi-target service capability, the number of users served as a whole is still limited, and it is difficult to achieve massive services and random access for users. However, some measurement and control requirements of many satellites at present and in the future are large in number and high in timeliness, but the speed requirements are not high. Directly using the existing relay satellite system to meet these requirements has problems with low availability, adaptability and cost-effectiveness. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a low-orbit spacecraft measurement and control method and system based on a high-orbit mobile communication satellite, which can solve the problem of lack of on-orbit measurement and control resources for massive low-orbit spacecraft in the present and future.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, the present invention provides a low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite, which is applied to a low-orbit spacecraft measurement and control system. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite includes a high-orbit mobile communication satellite, a relay terminal, a gateway station and a measurement and control service platform. The relay terminal, the high-orbit mobile communication satellite, the gateway station and the measurement and control service platform are sequentially connected in communication. The relay terminal is installed on the low-orbit spacecraft and is connected in communication with the low-orbit spacecraft. The method includes:

[0007] The measurement and control service platform sends remote control data to the relay terminal through the signal gateway and the high-orbit mobile communication satellite;

[0008] The relay terminal sends the remote control data to the low-orbit spacecraft;

[0009] The relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway station.

[0010] In an optional implementation manner, before the step of the measurement and control service platform sending remote control data to the relay terminal through the gateway and the high-orbit mobile communication satellite, the method further includes:

[0011] The relay terminal performs link synchronization with the gateway station through the high-orbit mobile communication satellite.

[0012] In an optional implementation manner, before the step of link synchronization between the relay terminal and the gateway via the high-orbit mobile communication satellite, the method further includes:

[0013] The relay terminal switches from a dormant state to an awake state according to a preset rule.

[0014] In an optional implementation manner, after the step of performing link synchronization between the relay terminal and the gateway via the high-orbit mobile communication satellite, the method further includes:

[0015] The relay terminal sends identity information, resource application request and authentication request to the gateway;

[0016] The information gateway performs identity recognition based on the identity information, and responds to the resource application request and the authentication request.

[0017] In an optional implementation manner, after the step of the relay terminal sending the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway, the method further includes:

[0018] The gateway sends a link release instruction to the relay terminal;

[0019] The relay terminal disconnects the link with the gateway according to the link release instruction.

[0020] In a second aspect, the present invention provides a low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite, comprising a high-orbit mobile communication satellite, a relay terminal, a gateway station and a measurement and control service platform, wherein the relay terminal, the high-orbit mobile communication satellite, the gateway station and the measurement and control service platform are sequentially communicatively connected, and the relay terminal is installed on the low-orbit spacecraft and is communicatively connected to the low-orbit spacecraft;

[0021] The measurement and control service platform is used to send remote control data to the relay terminal through the gateway station and the high-orbit mobile communication satellite;

[0022] The relay terminal is used to send the remote control data to the low-orbit spacecraft;

[0023] The relay terminal is also used to send the telemetry data sent by the low-orbit spacecraft to the measurement and control business platform through the high-orbit mobile communication satellite and the gateway station, so as to be forwarded to the satellite management platform.

[0024] In an optional implementation, the measurement and control service platform is also communicatively connected to the satellite management platform;

[0025] The measurement and control service platform is also used to provide the satellite management platform with measurement and control resource availability information and subsequent retransmission information.

[0026] In an optional implementation manner, the relay terminal is further used to update the beam coverage information table under preset conditions;

[0027] Among them, the preset conditions include the low-orbit spacecraft sending ephemeris data to the relay terminal at a preset time, the low-orbit spacecraft sending new ephemeris data to the relay terminal after the orbit changes, and the low-orbit spacecraft sending the ephemeris data sent by the satellite management platform to the relay terminal.

[0028] In an optional implementation, the relay terminal is further used to perform beam switching management according to the beam coverage information table.

[0029] In an optional implementation, the relay terminal is further used to obtain a target beam according to the beam coverage information table when the low-orbit spacecraft enters a beam overlap area; wherein the beam overlap area includes a current beam and the target beam;

[0030] The relay terminal is further configured to establish a second service channel in the target beam while transmitting and receiving data on the first service channel of the current beam;

[0031] The relay terminal is also used to release the first service channel and send and receive data through the second service channel when it is determined that the low-orbit spacecraft moves from the current beam to the target beam.

[0032] The beneficial effects of the low-orbit spacecraft measurement and control method and system based on high-orbit mobile communication satellite provided by the embodiments of the present invention include: the low-orbit spacecraft measurement and control method based on high-orbit mobile communication satellite is applied to the low-orbit spacecraft measurement and control system, the low-orbit spacecraft measurement and control system based on high-orbit mobile communication satellite includes a high-orbit mobile communication satellite, a relay terminal, a signal gateway station and a measurement and control business platform, the relay terminal, the high-orbit mobile communication satellite, the signal gateway station and the measurement and control business platform are sequentially communicatively connected, the relay terminal is installed on the low-orbit spacecraft and is communicatively connected with the low-orbit spacecraft, the low-orbit spacecraft measurement and control method based on the high-orbit mobile communication satellite includes: the measurement and control business platform sends remote control data to the relay terminal through the signal gateway station and the high-orbit mobile communication satellite; the relay terminal sends the remote control data to the low-orbit spacecraft; the relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control business platform through the high-orbit mobile communication satellite and the signal gateway station.

[0033] It can be seen that the addition of measurement and control service platforms and relay terminals in addition to the existing high-orbit mobile communication satellite system can use the existing high-orbit mobile communication satellites and gateway stations as data transmission channels according to the needs of measurement and control users, and cooperate to complete the measurement and control tasks of low-orbit spacecraft. The service is provided in a time-division multiplexing manner, and the measurement and control resources are sufficient. There is no need for the pre-application process of measurement and control resources for ground-based measurement and control systems and relay satellite systems, thereby solving the current and future problems of the lack of on-orbit measurement and control resources for massive low-orbit spacecraft. At the same time, the high-orbit mobile communication satellite system has a long life, works all the time, and has high reliability requirements. The entire industry chain from terminals to gateway stations is relatively mature, and provides reliable communication services for massive users. Therefore, the low-orbit spacecraft measurement and control system built on the basis of the high-orbit mobile communication satellite system supports measurement and control of low-orbit spacecraft throughout its life cycle, has no potential commercial risks, and the service is controllable, credible, and reliable. In addition, the high-orbit mobile communication satellite supports the measurement and control of low-orbit spacecraft as a new service based on a mature satellite communication system, and uses the Internet to provide services to users. The comprehensive investment of users during the entire life cycle is small and the cost-effectiveness is high.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1A schematic diagram of an application scenario of a low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite provided by an embodiment of the present invention is shown;

[0037] Figure 2 A schematic flow chart of a low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided by an embodiment of the present invention is shown;

[0038] Figure 3 A schematic flow chart of another low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided by an embodiment of the present invention is shown;

[0039] Figure 4 A schematic flow chart of another low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided by an embodiment of the present invention is shown;

[0040] Figure 5 A schematic flow chart of another low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided by an embodiment of the present invention is shown;

[0041] Figure 6 A schematic flow chart of another low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided in an embodiment of the present invention is shown.

[0042] Icons: 100- low-orbit spacecraft measurement and control system based on high-orbit mobile communication satellite; 110- high-orbit mobile communication satellite; 120- relay terminal; 130- low-orbit spacecraft; 140- gateway station; 150- measurement and control business platform; 160- satellite management platform. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0045] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] Please refer to Figure 1 , is a schematic diagram of the application environment of a low-orbit spacecraft measurement and control system 100 based on a high-orbit mobile communication satellite. The low-orbit spacecraft measurement and control system 100 based on a high-orbit mobile communication satellite includes a high-orbit mobile communication satellite 110, a relay terminal 120, a gateway station 140 and a measurement and control service platform 150. The relay terminal 120, the high-orbit mobile communication satellite 110, the gateway station 140 and the measurement and control service platform 150 are sequentially connected in communication. The relay terminal 120 is installed on a low-orbit spacecraft 130 and is connected in communication with the low-orbit spacecraft 130.

[0047] In this embodiment, the measurement and control service platform 150 is used to send remote control data to the relay terminal 120 through the gateway station 140 and the high-orbit mobile communication satellite 110; the relay terminal 120 is used to send the remote control data to the low-orbit spacecraft 130; the relay terminal 120 is also used to send the telemetry data sent by the low-orbit spacecraft 130 to the measurement and control service platform 150 through the high-orbit mobile communication satellite 110 and the gateway station 140.

[0048] It can be understood that the telemetry data sent by the low-orbit spacecraft 130 is real-time data. As long as the low-orbit spacecraft 130, the relay terminal 120, the high-orbit mobile communication satellite 110, the gateway station 140 and the measurement and control service platform 150 can exchange data, the measurement and control service platform 150 can receive the telemetry data generated by the low-orbit spacecraft 130 in real time. The remote control data sent by the measurement and control service platform 150 is sent by the measurement and control service platform 150 according to user needs, so the execution result of the remote control data can be observed through the telemetry data, that is, part of the telemetry data is generated according to the remote control data.

[0049] Furthermore, in this embodiment, the measurement and control service platform 150 is also connected to the satellite management platform 160. It can be understood that the measurement and control service platform 150 mainly provides data processing functions, that is, the measurement and control service platform 150 can receive the remote control data sent by the user through the satellite management platform 160, convert the remote control data into a high-orbit mobile communication service data format, and send it to the gateway station 140 in real time, and the gateway station 140 sends the remote control data after format conversion to the relay terminal 120 through the high-orbit mobile communication satellite 110. Among them, the high-orbit mobile communication service data format is a data format that can be recognized by the gateway station and the relay terminal.

[0050] In this embodiment, the measurement and control service platform 150 can also receive telemetry data sent by the relay terminal 120 through the high-orbit mobile communication satellite 110 and the gateway station 140, convert the telemetry data from the high-orbit mobile communication service data format to the telemetry frame format required by the satellite management platform 160, and send it to the satellite management platform 160 in real time.

[0051] It can be understood that the remote control data is a control instruction sent by the user through the satellite management platform 160. The low-orbit spacecraft 130 can provide telemetry data corresponding to the execution result of the control instruction. The low-orbit spacecraft 130 can also provide telemetry data unrelated to the remote control instruction. The telemetry data can be the device status information, temperature information, and voltage information of the low-orbit spacecraft 130.

[0052] In this embodiment, the measurement and control business platform 150 also has the function of data management, that is, the measurement and control business platform 150 can temporarily store and process the remote control data sent by different satellite management platforms 160. The measurement and control business platform 150 can also resend the telemetry data of the selected low-orbit spacecraft 130 and the time period to the corresponding satellite management platform 160 afterwards according to user needs.

[0053] In this embodiment, the measurement and control service platform 150 also has a situation display function, and the system administrator can understand the time period during which the high-orbit mobile communication satellite 110 can provide services through the measurement and control service real-time information and expected service information displayed by the measurement and control service platform 150.

[0054] In addition, the TT&C service platform 150 can provide the satellite management platform 160 with TT&C resource availability information and post-retransmission information, etc., so that the satellite management platform 160 can display them.

[0055] Through the available measurement and control resource information displayed on the satellite management platform 160, the user can learn whether the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are available. That is to say, when the user learns that the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are available, the user can send remote control data through the corresponding satellite management platform 160; if the user learns that the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are unavailable, the user cannot send remote control data through the corresponding satellite management platform 160.

[0056] Further, in this embodiment, the relay terminal 120 is installed on the low-orbit spacecraft 130, and the relay terminal 120 includes a main controller, a modem, a radio frequency front-end unit, a power supply, an antenna unit, etc. After receiving the remote control data sent by the high-orbit mobile communication satellite 110, the relay terminal 120 will convert the remote control data into a format so that the low-orbit spacecraft 130 can recognize the remote control data. After receiving the telemetry data sent by the low-orbit spacecraft 130, the relay terminal 120 will also convert the format so that the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite can normally transmit the telemetry data.

[0057] In addition to being able to interact with the low-orbit spacecraft 130 for telemetry data and remote control data, the relay terminal 120 is also used to update the beam coverage information table under preset conditions; wherein the preset conditions include the low-orbit spacecraft 130 sending ephemeris data to the relay terminal 120 at a preset time, the low-orbit spacecraft 130 sending new ephemeris data to the relay terminal 120 after the orbit changes, and the low-orbit spacecraft 130 sending ephemeris data sent by the satellite management platform 160 to the relay terminal 120.

[0058] It can be understood that the beam coverage information table includes entry and exit time, beam number and corresponding broadcast information, etc. The entry and exit time can be understood as the time when the low-orbit spacecraft 130 enters and exits the beam coverage area. The low-orbit spacecraft 130 sends the ephemeris data to the relay terminal 120 at a preset time, which means that the low-orbit spacecraft 130 sends the ephemeris data to the relay terminal 120 at a fixed time every day.

[0059] When the relay terminal 120 receives at least one of the following: the ephemeris data sent by the low-orbit spacecraft 130 to the relay terminal 120 at a preset time, the new ephemeris data sent by the low-orbit spacecraft 130 to the relay terminal 120 after the orbit changes, and the ephemeris data sent by the satellite management platform 160 to the relay terminal 120 by the low-orbit spacecraft 130, the relay terminal 120 will update the beam coverage information table. Among them, the ephemeris data is the position data of the low-orbit spacecraft 130. The relay terminal 120 can calculate the latest time of the low-orbit spacecraft 130 entering and leaving the beam coverage area, the beam number, and the broadcast information based on the ephemeris data. Therefore, the relay terminal 120 updates the content of the beam coverage table based on the latest entry and exit time, beam number, and broadcast information.

[0060] In this embodiment, the relay terminal 120 is also used to perform beam switching management according to the beam coverage information table. That is, the relay terminal 120 is also used to obtain the target beam according to the beam coverage information table when the low-orbit spacecraft 130 enters the beam overlap area; wherein the beam overlap area includes the current beam and the target beam; the relay terminal 120 is also used to establish a second service channel in the target beam while transmitting and receiving data on the first service channel of the current beam; the relay terminal 120 is also used to release the first service channel and transmit and receive data through the second service channel when it is determined that the low-orbit spacecraft 130 moves from the current beam to the target beam.

[0061] It can be understood that during the beam switching, in order to ensure the continuous and stable transmission of remote control data and telemetry data. The relay terminal 120 will obtain the target beam according to the beam coverage information table when the low-orbit spacecraft 130 enters the beam overlap area. The target beam can be understood as the beam corresponding to the beam coverage area that the low-orbit spacecraft 130 is about to enter. After obtaining the target beam, the relay terminal 120 will establish a second service channel based on the target beam. However, since the relay terminal 120 has not left the beam coverage area corresponding to the current beam, even if the relay terminal 120 establishes the second service channel, it will continue to use the first service channel previously established based on the current beam for data transmission and reception. When the relay terminal 120 determines that the low-orbit spacecraft 130 moves from the beam coverage area corresponding to the current beam to the beam coverage area corresponding to the target beam, the relay terminal 120 will release the first service channel and only transmit and receive data through the second service channel. That is, the relay terminal 120 will disconnect the first service channel and only transmit and receive remote control data and telemetry data through the second service channel.

[0062] In this embodiment, the premise that the satellite management platform 160 and the low-orbit spacecraft can exchange data through the relay terminal 120 is that the relay terminal 120 installed on the low-orbit spacecraft performs link synchronization with the gateway station 140 through the high-orbit mobile communication satellite 110. It can be understood that before the satellite management platform 160 and the low-orbit spacecraft communicate, a communication link needs to be established, which can also be understood as a service channel, that is, the ground satellite management platform 160, the measurement and control service platform 150 and the gateway station 140 have always established a communication link, and the communication link between the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120 installed on the low-orbit spacecraft will only be established when satellite communication measurement and control is required. Only after the communication link is established between the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120 installed on the low-orbit spacecraft, can the remote control data and telemetry data be exchanged between the measurement and control service platform 150 and the low-orbit spacecraft through the relay terminal 120.

[0063] In this embodiment, the relay terminal 120 is further configured to switch from the sleep state to the awake state according to a preset rule before link synchronization.

[0064] It can be understood that in order to save power consumption of the relay terminal 120, when the relay terminal 120 does not provide the remote control data and telemetry data relay service, the relay terminal 120 is in a dormant state. When the relay terminal 120 is in a dormant state, the communication link between the measurement and control service platform 150, the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120 is disconnected, that is, the communication link is not established. The situation where the relay terminal 120 does not provide the remote control data and telemetry data relay service is generally when the low-orbit spacecraft 130 is not in the beam coverage area.

[0065] The preset rules for the relay terminal 120 to switch from the dormant state to the awakened state may be: the first may be ground remote control, that is, the staff sends a wake-up instruction to the relay terminal 120 through the ground equipment, and the relay terminal 120 switches from the dormant state to the awakened state according to the wake-up instruction; the second may be the control of the low-orbit spacecraft 130, that is, the low-orbit spacecraft 130 has a wake-up program downloaded in advance, and the wake-up program may be a timing program. When the timing reaches the preset time, the low-orbit spacecraft 130 sends a wake-up instruction to the relay terminal 120, and the relay terminal 120 switches from the dormant state to the awakened state according to the wake-up instruction; the third may be that the relay terminal 120 itself has a set of judgment programs, and when the timing reaches the preset time, the relay terminal 120 automatically switches from the dormant state to the awakened state. After entering the awakened state, the relay terminal 120 will determine whether it has entered the beam coverage area. If it is in the beam coverage area, it will obtain the broadcast information of the beam corresponding to the beam coverage area from the stored information, and start to synchronize the link with the gateway station 140 through the high-orbit mobile communication satellite 110. If the relay terminal 120 does not enter the beam coverage area after entering the awake state, the relay terminal 120 will switch to the sleep state again.

[0066] In this embodiment, in order to ensure the security of interactive data transmission, after the relay terminal 120 performs link synchronization with the gateway station 140 through the high-orbit mobile communication satellite 110, the relay terminal 120 is also used to send identity information, resource application requests and authentication requests to the gateway station 140; the gateway station 140 performs identity recognition based on the identity information, and responds to the resource application request and authentication request.

[0067] It can be understood that the transmission of remote control data and telemetry data will only be carried out after the gateway station 140 confirms that the identity information of the relay terminal 120 is legal and responds to the authentication request of the relay terminal 120 to confirm that the relay terminal 120 has the authority. At the same time, the gateway station 140 will also respond to the resource application request sent by the relay terminal 120 to determine whether the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are still available. If the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are still available, the relay terminal 120 is allowed to interact with the measurement and control service platform 150 for remote control data and telemetry data. If all the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are occupied, the resource application request of the relay terminal 120 will not be responded to, and the measurement and control service platform 150 will not interact with the relay terminal 120 for remote control data and telemetry data. Of course, the relay terminal 120 can also apply for resources in real time. When there are still resources left in the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite, the relay terminal 120 will be allowed to interact with the measurement and control service platform 150 for remote control data and telemetry data.

[0068] In this embodiment, in order to ensure stable and reliable interactive data transmission, the relay terminal 120 can adopt a handshake mode (i.e., confirmation mode) during data transmission between the high-orbit mobile communication satellite 110 and the gateway station 140 and the measurement and control service platform 150 to ensure reliable data transmission. When a data packet is found to be lost, the lost packet will be retransmitted.

[0069] In this embodiment, after the relay terminal 120 sends the telemetry data to the measurement and control service platform 150 through the high-orbit mobile communication satellite 110 and the gateway station 140, the gateway station 140 is also used to send a link release instruction to the relay terminal 120; the relay terminal 120 is also used to disconnect the link with the gateway station 140 according to the link release instruction.

[0070] In this embodiment, the measurement and control service platform 150 may adopt a server, the satellite management platform 160 may adopt a handheld device, a notebook, a desktop computer, etc., and the high-orbit mobile communication satellite 110 may adopt a Tiantong satellite.

[0071] Please refer to Figure 2 , is a flow chart of a low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided in an embodiment of the present invention. It should be noted that the low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided in an embodiment of the present invention is not based on Figure 2 The specific order below is not limited. It should be understood that in other embodiments, the order of some steps in the low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite provided in the embodiment of the present invention can be interchanged according to actual needs, or some steps can be omitted or deleted. The low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite can be applied in Figure 1 In the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite shown in FIG. Figure 2 The specific process shown is described in detail.

[0072] Step S101: The measurement and control service platform sends remote control data to the relay terminal through a signal gateway and a high-orbit mobile communication satellite.

[0073] It can be understood that the measurement and control service platform 150 can receive the remote control data sent by the user through the satellite management platform 160, convert the remote control data into the high-orbit mobile communication service data format, and send it to the gateway station 140 in real time, and the gateway station 140 sends the remote control data after the format conversion to the relay terminal 120 through the high-orbit mobile communication satellite 110. Among them, the high-orbit mobile communication service data format is a data format that can be recognized by the gateway station and the relay terminal.

[0074] The remote control data is a control instruction sent by the user through the satellite management platform 160. The low-orbit spacecraft 130 can provide telemetry data corresponding to the execution result of the control instruction. The low-orbit spacecraft 130 can also provide telemetry data unrelated to the remote control instruction. For example, the control instruction can be a temperature acquisition instruction, and the low-orbit spacecraft 130 can provide current temperature information corresponding to the execution result of the temperature acquisition instruction; the control instruction can also be a device state control instruction, and the low-orbit spacecraft 130 can provide adjusted device state information corresponding to the execution result of the device state control instruction.

[0075] Step S102: The relay terminal sends the remote control data to the low-orbit spacecraft.

[0076] It can be understood that after receiving the remote control data sent by the high-orbit mobile communication satellite 110, the relay terminal 120 will convert the format of the remote control data so that the low-orbit spacecraft 130 can recognize the remote control data.

[0077] Step S103: The relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the signal gateway.

[0078] It can be understood that the measurement and control service platform 150 can also receive the telemetry data sent by the relay terminal 120 through the high-orbit mobile communication satellite 110 and the gateway station 140, convert the telemetry data from the high-orbit mobile communication service data format to the telemetry frame format required by the satellite management platform 160, and send it to the satellite management platform 160 in real time. After receiving the telemetry data sent by the low-orbit spacecraft 130, the relay terminal 120 will also perform format conversion so that the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite can normally transmit the telemetry data.

[0079] Among them, the telemetry data is real-time data. As long as the low-orbit spacecraft 130, the relay terminal 120, the high-orbit mobile communication satellite 110, the gateway station 140 and the measurement and control service platform 150 can exchange data, the measurement and control service platform 150 can receive the telemetry data generated by the low-orbit spacecraft 130 in real time. The remote control data sent by the measurement and control service platform 150 is sent by the measurement and control service platform 150 according to user needs, so the execution result of the remote control data can be observed through the telemetry data, that is, part of the telemetry data is generated according to the remote control data. The telemetry data can be the equipment status information, temperature information, and voltage information of the low-orbit spacecraft 130.

[0080] Furthermore, in the present embodiment, in addition to being able to interact with the low-orbit spacecraft 130 for telemetry data and remote control data, the relay terminal 120 is also used to update the beam coverage information table under preset conditions; wherein the preset conditions include the low-orbit spacecraft 130 sending ephemeris data to the relay terminal 120 at a preset time, the low-orbit spacecraft 130 sending new ephemeris data to the relay terminal 120 after the orbit changes, and the low-orbit spacecraft 130 sending ephemeris data sent by the satellite management platform 160 to the relay terminal 120.

[0081] It can be understood that the beam coverage information table includes entry and exit time, beam number and corresponding broadcast information, etc. The entry and exit time can be understood as the time when the low-orbit spacecraft 130 enters and exits the beam coverage area. The low-orbit spacecraft 130 sends the ephemeris data to the relay terminal 120 at a preset time, which can be the ephemeris data sent by the low-orbit spacecraft 130 to the relay terminal 120 on a regular basis every day.

[0082] When the relay terminal 120 receives at least one of the following: the ephemeris data sent by the low-orbit spacecraft 130 to the relay terminal 120 at a preset time, the new ephemeris data sent by the low-orbit spacecraft 130 to the relay terminal 120 after the orbit changes, and the ephemeris data sent by the satellite management platform 160 to the relay terminal 120 by the low-orbit spacecraft 130, the relay terminal 120 will update the beam coverage information table. Among them, the ephemeris data is the position data of the low-orbit spacecraft 130. The relay terminal 120 can calculate the latest time of the low-orbit spacecraft 130 entering and leaving the beam coverage area, the beam number, and the broadcast information based on the ephemeris data. Therefore, the relay terminal 120 updates the content of the beam coverage table based on the latest entry and exit time, beam number, and broadcast information.

[0083] In this embodiment, the relay terminal 120 is also used to perform beam switching management according to the beam coverage information table. That is, the relay terminal 120 is also used to obtain the target beam according to the beam coverage information table when the low-orbit spacecraft 130 enters the beam overlap area; wherein the beam overlap area includes the current beam and the target beam; the relay terminal 120 is also used to establish a second service channel in the target beam while transmitting and receiving data on the first service channel of the current beam; the relay terminal 120 is also used to release the first service channel and transmit and receive data through the second service channel when it is determined that the low-orbit spacecraft 130 moves from the current beam to the target beam.

[0084] It can be understood that during the beam switching, in order to ensure the continuous and stable transmission of remote control data and telemetry data. The relay terminal 120 will obtain the target beam according to the beam coverage information table when the low-orbit spacecraft 130 enters the beam overlap area. The target beam can be understood as the beam corresponding to the beam coverage area that the low-orbit spacecraft 130 is about to enter. After obtaining the target beam, the relay terminal 120 will establish a second service channel based on the target beam. However, since the relay terminal 120 has not left the beam coverage area corresponding to the current beam, even if the relay terminal 120 establishes the second service channel, it will continue to use the first service channel previously established based on the current beam for data transmission and reception. When the relay terminal 120 determines that the low-orbit spacecraft 130 moves from the beam coverage area corresponding to the current beam to the beam coverage area corresponding to the target beam, the relay terminal 120 will release the first service channel and only transmit and receive data through the second service channel. That is, the relay terminal 120 will disconnect the first service channel and only transmit and receive remote control data and telemetry data through the second service channel.

[0085] Please refer to Figure 3 Before step S101, the low-orbit spacecraft measurement and control method based on the high-orbit mobile communication satellite also includes the following steps:

[0086] Step S201: The relay terminal performs link synchronization with a gateway via a high-orbit mobile communication satellite.

[0087] It can be understood that before the satellite management platform 160 and the relay terminal 120 communicate, a communication link needs to be established, which can also be understood as a service channel, that is, the ground satellite management platform 160, the measurement and control service platform 150 and the gateway station 140 always have a communication link, and the communication link between the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120 will only be established when satellite communication measurement and control is required. Only after the communication link is established between the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120, can the remote control data and the telemetry data be exchanged between the measurement and control service platform 150 and the relay terminal 120.

[0088] Please refer to Figure 4 Before step S201, the low-orbit spacecraft measurement and control method based on the high-orbit mobile communication satellite also includes the following steps:

[0089] Step S301: the relay terminal switches from a dormant state to an awake state according to a preset rule.

[0090] It can be understood that in order to save power consumption of the relay terminal 120, when the relay terminal 120 does not provide the remote control data and telemetry data relay service, the relay terminal 120 is in a dormant state. When the relay terminal 120 is in a dormant state, the communication link between the measurement and control service platform 150, the gateway station 140, the high-orbit mobile communication satellite 110 and the relay terminal 120 is disconnected, that is, the communication link is not established. The situation where the relay terminal 120 does not provide the remote control data and telemetry data relay service is generally when the low-orbit spacecraft 130 is not in the beam coverage area.

[0091] The preset rules for the relay terminal 120 to switch from the dormant state to the awakened state may be: the first may be ground remote control, that is, the staff sends a wake-up instruction to the relay terminal 120 through the ground equipment, and the relay terminal 120 switches from the dormant state to the awakened state according to the wake-up instruction; the second may be the control of the low-orbit spacecraft 130, that is, the low-orbit spacecraft 130 has a wake-up program downloaded in advance, and the wake-up program may be a timing program. When the timing reaches the preset time, the low-orbit spacecraft 130 sends a wake-up instruction to the relay terminal 120, and the relay terminal 120 switches from the dormant state to the awakened state according to the wake-up instruction; the third may be that the relay terminal 120 itself has a set of judgment programs, and when the timing reaches the preset time, the relay terminal 120 automatically switches from the dormant state to the awakened state. After entering the awakened state, the relay terminal 120 will determine whether it has entered the beam coverage area. If it is in the beam coverage area, it will obtain the broadcast information of the beam corresponding to the beam coverage area from the stored information, and start to synchronize the link with the gateway station 140 through the high-orbit mobile communication satellite 110. If the relay terminal 120 does not enter the beam coverage area after entering the awake state, the relay terminal 120 will switch to the sleep state again.

[0092] Please refer to Figure 5 After step S201, the low-orbit spacecraft measurement and control method based on the high-orbit mobile communication satellite further includes the following steps:

[0093] Step S401: The relay terminal sends identity information, resource application request and authentication request to the gateway.

[0094] Step S402: The information gateway performs identity recognition based on the identity information, and responds to the resource application request and the authentication request.

[0095] It can be understood that the transmission of remote control data and telemetry data will only be carried out after the gateway station 140 confirms that the identity information of the relay terminal 120 is legal and responds to the authentication request of the relay terminal 120 to confirm that the relay terminal 120 has the authority. At the same time, the gateway station 140 will also respond to the resource application request sent by the relay terminal 120 to determine whether the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are still available. If the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are still available, the relay terminal 120 is allowed to interact with the measurement and control service platform 150 for remote control data and telemetry data. If all the resources of the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite are occupied, the resource application request of the relay terminal 120 will not be responded to, and the measurement and control service platform 150 will not interact with the relay terminal 120 for remote control data and telemetry data. Of course, the relay terminal 120 can also apply for resources in real time. When there are still resources left in the low-orbit spacecraft measurement and control system 100 based on the high-orbit mobile communication satellite, the relay terminal 120 will be allowed to interact with the measurement and control service platform 150 for remote control data and telemetry data.

[0096] Please refer to Figure 6 After step S103, the low-orbit spacecraft measurement and control method based on the high-orbit mobile communication satellite further includes the following steps:

[0097] Step S501: The gateway sends a link release instruction to the relay terminal.

[0098] In step S502 , the relay terminal 120 disconnects the link with the gateway 140 according to the link release instruction.

[0099] In summary, an embodiment of the present invention provides a low-orbit spacecraft measurement and control method and system based on a high-orbit mobile communication satellite. The low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite is applied to a low-orbit spacecraft measurement and control system. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite includes a high-orbit mobile communication satellite, a relay terminal, a signal gateway station and a measurement and control service platform. The relay terminal, the high-orbit mobile communication satellite, the signal gateway station and the measurement and control service platform are communicatively connected in sequence. The relay terminal is installed on the low-orbit spacecraft and is communicatively connected to the low-orbit spacecraft. The low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite includes: the measurement and control service platform sends remote control data to the relay terminal through the signal gateway station and the high-orbit mobile communication satellite; the relay terminal sends the remote control data to the low-orbit spacecraft; the relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the signal gateway station.

[0100] It can be seen that in addition to the existing high-orbit mobile communication satellite system, the addition of a measurement and control service platform, a low-orbit spacecraft, and a relay terminal can use the existing high-orbit mobile communication satellite and a signal gateway as a data transmission channel according to the measurement and control user needs to cooperate in completing the measurement and control tasks of low-orbit spacecraft. The service is provided in a time-division multiplexing manner, and the measurement and control resources are sufficient. There is no need for the measurement and control resource pre-application process of the ground-based measurement and control system and the relay satellite system, thereby solving the current and future problems of the lack of measurement and control resources for massive low-orbit spacecraft. At the same time, the high-orbit mobile communication satellite system has a long life, works all the time, and has high reliability requirements. The entire industry chain from the terminal to the signal gateway is relatively mature, and provides reliable communication services for a large number of users. Therefore, there is no potential commercial risk in supporting the measurement and control of low-orbit spacecraft throughout its life cycle, and the service is controllable, trustworthy, and reliable. The high-orbit mobile communication satellite supports the measurement and control of low-orbit spacecraft as a new service based on a mature satellite communication system, and uses the Internet to provide services to users. The comprehensive investment of users during the entire life cycle is small and the cost-effectiveness is high.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite, characterized in that: Applied to a low-orbit spacecraft measurement and control system, the low-orbit spacecraft measurement and control system includes a high-orbit mobile communication satellite, a relay terminal, a gateway station and a measurement and control service platform, the relay terminal, the high-orbit mobile communication satellite, the gateway station and the measurement and control service platform are sequentially communicatively connected, the relay terminal is installed on the low-orbit spacecraft and is communicatively connected with the low-orbit spacecraft, and the method includes: The relay terminal switches from a dormant state to an awake state according to a preset rule; After entering the awake state, the relay terminal determines whether it enters the beam coverage area, and if it is in the beam coverage area, obtains the broadcast information of the beam corresponding to the beam coverage area from the stored information; The relay terminal performs link synchronization with the gateway via the high-orbit mobile communication satellite; The measurement and control service platform sends remote control data to the relay terminal through the signal gateway and the high-orbit mobile communication satellite; The relay terminal sends the remote control data to the low-orbit spacecraft; The relay terminal sends the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway station.

2. The low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite according to claim 1 is characterized in that: After the step of performing link synchronization between the relay terminal and the gateway via the high-orbit mobile communication satellite, the method further comprises: The relay terminal sends identity information, resource application request and authentication request to the gateway; The information gateway performs identity recognition based on the identity information, and responds to the resource application request and the authentication request.

3. The low-orbit spacecraft measurement and control method based on a high-orbit mobile communication satellite according to claim 1, characterized in that: After the step of the relay terminal sending the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway station, the method further includes: The gateway sends a link release instruction to the relay terminal; The relay terminal disconnects the link with the gateway according to the link release instruction.

4. A low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite, characterized in that: It includes a high-orbit mobile communication satellite, a relay terminal, a gateway station and a measurement and control service platform, wherein the relay terminal, the high-orbit mobile communication satellite, the gateway station and the measurement and control service platform are sequentially connected in communication, and the relay terminal is installed on a low-orbit spacecraft and is connected in communication with the low-orbit spacecraft; The relay terminal is used to switch from a dormant state to an awake state according to a preset rule; The relay terminal is used to determine whether it enters the beam coverage area after entering the awake state, and if it is in the beam coverage area, obtain the broadcast information of the beam corresponding to the beam coverage area from the stored information; The relay terminal is used to perform link synchronization with the gateway station through the high-orbit mobile communication satellite; The measurement and control service platform is used to send remote control data to the relay terminal through the gateway station and the high-orbit mobile communication satellite; The relay terminal is used to send the remote control data to the low-orbit spacecraft; The relay terminal is also used to send the telemetry data sent by the low-orbit spacecraft to the measurement and control service platform through the high-orbit mobile communication satellite and the gateway station.

5. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite according to claim 4, characterized in that: The measurement and control business platform is also connected to the satellite management platform for communication; The measurement and control service platform is also used to provide the satellite management platform with measurement and control resource availability information and subsequent retransmission information.

6. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite according to claim 5, characterized in that: The relay terminal is also used to update the beam coverage information table under preset conditions; Among them, the preset conditions include the low-orbit spacecraft sending ephemeris data to the relay terminal at a preset time, the low-orbit spacecraft sending new ephemeris data to the relay terminal after the orbit changes, and the low-orbit spacecraft sending the ephemeris data sent by the satellite management platform to the relay terminal.

7. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite according to claim 6, characterized in that: The relay terminal is also used to perform beam switching management according to the beam coverage information table.

8. The low-orbit spacecraft measurement and control system based on a high-orbit mobile communication satellite according to claim 7, characterized in that: The relay terminal is further used to obtain a target beam according to the beam coverage information table when the low-orbit spacecraft enters a beam overlap area; wherein the beam overlap area includes a current beam and the target beam; The relay terminal is further configured to establish a second service channel in the target beam while transmitting and receiving data on the first service channel of the current beam; The relay terminal is also used to release the first service channel and send and receive data through the second service channel when it is determined that the low-orbit spacecraft moves from the current beam to the target beam.

Images