A vehicle-mounted movable ground station for satellite-to-ground laser communication

Abstract

A vehicle-mounted movable ground station for satellite-to-ground laser communication relates to the field of laser communication technology, and solves the problems in the prior art that laser communication ground stations have high requirements for infrastructure conditions and cannot be moved and used once deployed. The ground station includes an optoelectronic payload system and an integrated signal processing system; the optoelectronic payload system is rotatable; the optoelectronic payload system is used to collect satellite-to-ground downlink signal lasers, and is also used to perform beam reduction and fine tracking control on the signal lasers, and is also used to perform spot correction on the signal lasers, and is also used to couple space light into optical fibers and send them to the integrated signal processing system; the integrated signal processing system is used to receive laser signals in optical fibers, process them, and then send the processed data through the optoelectronic payload system; the integrated signal processing system is also used to obtain target satellite orbit information, and perform orbit recursion, and control the optoelectronic payload system through the recursion results to achieve coarse and fine signal locking respectively. The present invention is suitable for space laser communication.

Description

Technical Field

[0001] The present invention relates to the field of laser communication technology, and in particular to a vehicle-mounted movable ground station for satellite-to-ground laser communication. Background Art

[0002] In the past three decades, space laser communication has become a transformative technology for scientific research, national defense and aerospace applications. Compared with traditional microwave communication, laser communication has obvious advantages of high bandwidth, small size, light weight, low power consumption and good safety. With the continuous increase in the amount of satellite data, satellite-to-ground space laser communication can provide it with higher downlink capabilities and overcome the current data transmission bottleneck problem. The terminals of satellite-to-ground laser communication are divided into on-board terminals and ground station terminals. The ground station terminal mainly uses a large-aperture telescope as an optical antenna and a tracking turntable as a rotating actuator.

[0003] There are a limited number of existing laser communication ground stations, which are usually built at locations with existing infrastructure, such as observatories. One of the main challenges facing laser communication ground stations is the limitations imposed by weather, where cloud-free line-of-sight is required between the satellite in space and the ground terminal, which limits the availability of individual stations. The location diversity of ground stations is critical to the overall link availability. Summary of the invention

[0004] The present invention provides a vehicle-mounted movable ground station for satellite-to-ground laser communication, which is used to solve the problems in the prior art that the laser communication ground station has high requirements on infrastructure conditions and cannot be moved for use once deployed.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a vehicle-mounted movable ground station for satellite-to-ground laser communication, the ground station comprising an optoelectronic payload system and an integrated signal processing system;

[0007] The photoelectric load system is rotatable;

[0008] The optoelectronic payload system is used to collect satellite-to-ground downlink signal lasers, to perform beam reduction and precision tracking control on the signal lasers, to perform spot correction on the signal lasers, and to couple spatial light into optical fibers and send the spatial light to the integrated signal processing system.

[0009] The integrated signal processing system is used to receive and process the laser signal in the optical fiber, and then send the processed data through the optoelectronic payload system;

[0010] The integrated signal processing system is also used to obtain the orbit information of the target satellite and perform orbit recursion, and control the optoelectronic payload system through the recursion result to achieve the locking of the coarse and fine signals respectively.

[0011] Furthermore, in a preferred embodiment, the above-mentioned optoelectronic payload system includes an optical receiving antenna, a relay optical unit, an adaptive optical unit and a fiber coupling unit;

[0012] The optical receiving antenna is used to collect satellite-to-ground downlink signal laser, and send the laser to the relay optical unit after beam shrinking;

[0013] The relay optical unit is used to perform precision tracking control on the received laser and send it to the adaptive optical unit;

[0014] The adaptive optical unit is used to perform signal spot correction on the received laser and send it to the optical fiber coupling unit;

[0015] The optical fiber coupling unit is used to couple the received spatial light into the optical fiber and send it to the integrated signal processing system.

[0016] Furthermore, in a preferred embodiment, the above-mentioned optoelectronic load system further includes a servo turntable, an optical transmitting antenna and a first power supply device;

[0017] The optical transmitting antenna is used to transmit the data processed by the integrated signal processing system;

[0018] The first power supply device is used to provide working power for the equipment in the photoelectric load system;

[0019] The servo turntable is used to drive the equipment in the photoelectric load system to rotate.

[0020] Furthermore, in another preferred embodiment, the optical receiving antenna is implemented by a large-aperture telescope;

[0021] The above-mentioned optical transmitting antenna is realized by using a small-aperture telescope.

[0022] Furthermore, in a preferred embodiment, the above-mentioned integrated signal processing system includes a signal processing module, a data storage module and a beacon terminal;

[0023] The signal processing module is used to receive the laser signal in the optical fiber, and is also used to detect, demodulate and decode the laser signal, and send the decoded data to the data storage module for storage;

[0024] The beacon terminal is used to generate a high-power beacon laser and send it to the optical transmitting antenna;

[0025] The optical transmitting antenna is used to transmit the decoded data under the action of the high-power beacon laser.

[0026] Furthermore, in a preferred embodiment, the above-mentioned integrated signal processing system also includes tracking control and ephemeris prediction;

[0027] The ephemeris prediction is used to obtain the orbit information of the target satellite and perform orbit recursion, and then send the recursion result to the tracking control;

[0028] The tracking control is used to generate the turntable control angle according to the recursive result, and is also used to control the servo turntable according to the turntable control angle to achieve signal coarse tracking and locking, and is also used to control the relay optical unit according to the turntable angle to achieve signal fine tracking and locking.

[0029] Furthermore, in a preferred embodiment, the above-mentioned integrated signal processing system further includes a communication switch, a station control unit and a time system unit;

[0030] The communication switch is used to realize data interaction between the optoelectronic load system and the integrated signal processing system;

[0031] The station control unit is used to integrate the optoelectronic load system and the integrated signal processing system according to the task sequence to achieve automated control;

[0032] The timing unit is used to receive GPS and Beidou dual-frequency signals and provide accurate timing information.

[0033] Furthermore, in a preferred embodiment, the ground station further comprises a cabin structure and a dome structure;

[0034] The cabin structure is used to carry the optoelectronic payload system and the integrated signal processing system;

[0035] The dome structure provides environmental protection for the optoelectronic payload system.

[0036] Furthermore, in a preferred embodiment, the integrated signal processing system further includes a cabin control and a second power supply device;

[0037] The shelter control is used to realize the opening and closing of the dome structure;

[0038] The second power supply device is used to provide working power for the integrated signal processing system, and is also used to provide working power for the first power supply device.

[0039] The present invention also provides a space laser communication method, which is implemented based on a vehicle-mounted movable ground station for satellite-to-ground laser communication as described in any one of the above items.

[0040] The beneficial effects of the present invention are:

[0041] 1. The present invention provides a vehicle-mounted mobile ground station for satellite-to-ground laser communication, which realizes the collection of satellite-to-ground downlink signal laser by adopting an optoelectronic payload system, and performs precision tracking control, spot correction and fiber coupling; adopts an integrated signal processing system to realize data decoding of laser signals in optical fibers and locking of coarse and fine signals; wherein, the optical antenna and optical path of the optoelectronic payload system adopt a light, small and compact design, and the supporting structure adopts low-density materials and lightweight design; the ephemeris prediction unit, tracking control unit and servo control unit in the integrated signal processing system adopt a co-processor integrated design, which is conducive to reducing the weight and volume of the entire station, and thus makes it possible to integrate the optoelectronic payload system and the integrated signal processing system into the cabin system. The invention solves the problems in the prior art that the laser communication ground station has high requirements for infrastructure conditions and cannot be moved and used once deployed.

[0042] 2. The present invention provides a vehicle-mounted mobile ground station for satellite-to-ground laser communications. By accessing the ephemeris forecast, it can predict the orbital position information of the satellite in a subsequent period of time based on the position information of the satellite at a certain moment or an initial moment and based on Kepler's law of planetary motion, and then use it to guide the ground station antenna to capture, track, and align (ATP) the satellite, thereby realizing two-way satellite-to-ground laser link establishment and maintenance, and realizing stable satellite-to-ground laser communications.

[0043] 3. The present invention provides a vehicle-mounted movable ground station for satellite-to-ground laser communication, which can be configured as a vehicle and can be loaded as a whole on a semi-trailer for transportation. Its structural dimensions such as length, width and height meet the requirements of road transportation.

[0044] 4. The present invention provides a vehicle-mounted movable ground station for satellite-to-earth laser communication. By adopting a light and small design and a vehicle-mounted configuration, it is convenient for vehicle transportation, so that it does not need to be built in a location with infrastructure. Instead, it can be moved at any time and deployed anywhere. It has high bandwidth, miniaturization, high mobility, better environmental adaptability, can avoid extreme weather and atmospheric turbulence, and improve utilization efficiency.

[0045] The invention is applicable to space laser communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of a vehicle-mounted movable ground station for satellite-to-ground laser communication according to the present invention;

[0047] Figure 2 It is a dome-closed state diagram of a vehicle-mounted movable ground station for satellite-to-ground laser communication according to the present invention;

[0048] Figure 3 It is a dome opening state diagram of a vehicle-mounted movable ground station for satellite-to-ground laser communication according to the present invention;

[0049] Figure 4 The present invention discloses a transport status diagram of a vehicle-mounted movable ground station for satellite-to-ground laser communication.

[0050] Among them, 1-photoelectric payload system, 10-optical receiving antenna, 11-relay optical unit, 12-adaptive optical unit, 13-fiber coupling unit, 14-servo turntable, 15-optical transmitting antenna, 16-first power supply equipment, 2-integrated signal processing system, 20-communication switch, 21-signal processing module, 22-data storage module, 23-beacon terminal, 24-tracking control, 25-ephemeris forecast, 26-cabin control, 27-station control unit, 28-time system unit, 29-second power supply equipment. DETAILED DESCRIPTION

[0051] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0052] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0053] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0054] The specific implementation mode of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

[0055] Implementation method 1, see Figure 1 This embodiment is described. This embodiment provides a vehicle-mounted movable ground station for satellite-to-ground laser communication, wherein the ground station includes an optoelectronic payload system 1 and an integrated signal processing system 2;

[0056] The photoelectric load system 1 is rotatable;

[0057] The optoelectronic payload system 1 is used to collect satellite-to-ground downlink signal lasers, to perform beam reduction and precision tracking control on the signal lasers, to perform spot correction on the signal lasers, and to couple spatial light into optical fibers and send the spatial light to the integrated signal processing system 2;

[0058] The integrated signal processing system 2 is used to receive the laser signal in the optical fiber, process it, and then send the processed data through the optoelectronic payload system 1;

[0059] The integrated signal processing system 2 is also used to obtain the orbit information of the target satellite and perform orbit recursion, and control the optoelectronic payload system 1 through the recursion result to respectively achieve the locking of the coarse and fine signals.

[0060] In practical application of this embodiment, the movable ground station includes an optoelectronic payload system 1 and an integrated signal processing system 2;

[0061] The optoelectronic payload system 1 can rotate so that it can accurately point to the downlink laser light source; the optoelectronic payload system 1 is used to collect the downlink signal laser from the satellite and the ground and transmit the uplink signal laser to the satellite, so as to realize the collection and beam reduction of the laser signal, and reduce the large-scale parallel light beam to a small-scale parallel light beam. It is also used to realize precise tracking control by splitting, converging, detecting and changing the direction of the beam-reduced space laser beam. It is also used to correct the spot of the signal laser, improve the signal quality, and weaken or eliminate the influence of atmospheric turbulence. It is also used to couple the space light into the optical fiber to complete the coupling of the laser signal from the space light to the optical fiber.

[0062] The integrated signal processing system 2 is used to receive the laser signal in the optical fiber, realize laser signal detection, photoelectric conversion, baseband demodulation and down-conversion, and data decoding. It is also used to obtain the orbit information of the target satellite and perform orbit recursion. The recursion result is used to control the optoelectronic payload system 1 to respectively realize the locking of the coarse and fine signals.

[0063] This embodiment provides a vehicle-mounted mobile ground station for satellite-to-ground laser communication, which uses an optoelectronic payload system to collect satellite-to-ground downlink signal lasers, and performs precision tracking control, spot correction, and fiber coupling; uses an integrated signal processing system to decode the data of laser signals in the optical fiber and lock the coarse and fine signals; the optical antenna and optical path of the optoelectronic payload system adopt a light, compact design, and the supporting structure adopts low-density materials and a lightweight design; the ephemeris prediction unit, tracking control unit, and servo control unit in the integrated signal processing system adopt a co-processor integrated design, which is conducive to reducing the weight and volume of the entire station, and thus makes it possible to integrate the optoelectronic payload system and the integrated signal processing system into the cabin system. It solves the problems in the prior art that the laser communication ground station has high requirements for infrastructure conditions and cannot be moved once deployed.

[0064] Implementation Method 2: See Figure 1 This embodiment is described. This embodiment is an example of an optoelectronic load system 1 in a vehicle-mounted mobile ground station for satellite-to-ground laser communication described in Embodiment 1.

[0065] The optoelectronic payload system 1 includes an optical receiving antenna 10, a relay optical unit 11, an adaptive optical unit 12 and a fiber coupling unit 13;

[0066] The optical receiving antenna 10 is used to collect the satellite-to-ground downlink signal laser, and send the laser to the relay optical unit 11 after beam shrinking;

[0067] The relay optical unit 11 is used to perform precision tracking control on the received laser and send it to the adaptive optical unit 12;

[0068] The adaptive optical unit 12 is used to perform signal spot correction on the received laser and send it to the optical fiber coupling unit 13;

[0069] The optical fiber coupling unit 13 is used to couple the received spatial light into the optical fiber and send it to the integrated signal processing system 2 .

[0070] In practical application, if Figure 1 As shown, the optical receiving antenna 10 and the relay optical unit 11 are installed in cascade. The optical receiving antenna 10 is a large-aperture telescope, which is used to collect downlink signal lasers from the satellite and the ground and transmit uplink signal lasers to the satellite, so as to collect and reduce the laser signals, and reduce the large-scale parallel beams to small-scale parallel beams. The relay optical unit 11 realizes precise tracking control by splitting, converging, detecting and changing the direction of the reduced space laser beam.

[0071] The relay optical unit 11 is installed in cascade with the adaptive optical unit 12. The adaptive optical unit 12 is used to detect and correct the wavefront of the space laser to complete the signal spot correction, improve the signal quality, and weaken or eliminate the influence of atmospheric turbulence.

[0072] The adaptive optical unit 12 and the optical fiber coupling unit 13 are installed in cascade connection to couple the spatial laser beam into the optical fiber, which is convenient for transmission in the optical fiber and completes the coupling of the laser signal from the spatial light to the optical fiber.

[0073] This embodiment provides a vehicle-mounted movable ground station for satellite-to-ground laser communication, which collects satellite-to-ground downlink signal lasers by adopting an optoelectronic payload system, and performs precision tracking control, spot correction, and fiber coupling. The optical antenna and optical path of the optoelectronic payload system adopt a light, compact design, and the supporting structure adopts low-density materials and a lightweight design. This helps to reduce the weight and volume of the entire station, thereby making it possible to integrate the optoelectronic payload system into the cabin system.

[0074] Implementation method three, see Figure 1 This embodiment is described. This embodiment adds a servo turntable 14, an optical transmitting antenna 15 and a first power supply device 16 to the vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 2;

[0075] The photoelectric payload system 1 further includes a servo turntable 14, an optical transmitting antenna 15 and a first power supply device 16;

[0076] The optical transmitting antenna 15 is used to transmit the data processed by the integrated signal processing system 2;

[0077] The first power supply device 16 is used to provide working power for the equipment in the photoelectric load system 1;

[0078] The servo turntable 14 is used to drive the equipment in the optoelectronic load system 1 to rotate.

[0079] In practical application, if Figure 1 As shown, the optical transmitting antenna 15 is implemented by a small-aperture telescope and is used to transmit a large-beam divergence uplink beacon laser to the satellite, that is, to send the data processed by the integrated signal processing system 2.

[0080] The first power supply device 16 is used to supply power to the devices inside the optoelectronic payload system 1 , namely, to provide working power to the optical receiving antenna 10 , the relay optical unit 11 , the adaptive optical unit 12 , the optical fiber coupling unit 13 and the servo turntable 14 .

[0081] The servo turntable 14 is a horizontal two-dimensional tracking frame system, which is a large inertia servo turntable consisting of two axes, namely, pitch and azimuth. The two axes are constantly adjusted as the satellite moves, driving the optical axis of the optical antenna to always point to the satellite. That is, it drives the equipment inside the optoelectronic payload system 1 to rotate, so that the optical axis of the optical receiving antenna 10 accurately points to the downlink laser light source, that is, the moving target satellite.

[0082] Embodiment 4: This embodiment is an example of the optical receiving antenna 10 and the optical transmitting antenna 15 in a vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 3;

[0083] The optical receiving antenna 10 is implemented by a large-aperture telescope;

[0084] The optical transmitting antenna 15 is implemented by a small-aperture telescope.

[0085] In actual application of this embodiment, the optical receiving antenna 10 is a large-aperture telescope, which is used to collect downlink signal lasers from the satellite and the ground and transmit uplink signal lasers to the satellite, so as to collect and reduce the laser signals, and reduce the large-scale parallel beams to small-scale parallel beams. The optical transmitting antenna 15 is implemented by a small-aperture telescope, and is used to transmit a large-beam divergence uplink beacon laser to the satellite.

[0086] Implementation method 5: See Figure 1 This embodiment is described. This embodiment is an example of the integrated signal processing system 2 in a vehicle-mounted mobile ground station for satellite-to-ground laser communication described in Embodiment 4.

[0087] The integrated signal processing system 2 includes a signal processing module 21, a data storage module 22 and a beacon terminal 23;

[0088] The signal processing module 21 is used to receive the laser signal in the optical fiber, and is also used to detect, demodulate and decode the laser signal, and send the decoded data to the data storage module 22 for storage;

[0089] The beacon terminal 23 is used to generate a high-power beacon laser and send it to the optical transmitting antenna 15;

[0090] The optical transmitting antenna 15 is used to transmit the decoded data under the action of the high-power beacon laser.

[0091] In practical application, if Figure 1 As shown, the signal processing module 21 is cascaded with the optical fiber coupling unit 13 in the optoelectronic payload system 1 in the form of optical fiber, and is used to receive the laser signal in the optical fiber to realize laser signal detection, optoelectronic conversion, baseband demodulation and down-conversion, and data decoding.

[0092] The data storage module 22 and the signal processing module 21 are cascaded in the form of optical fibers to achieve high-speed data reception and storage on disk.

[0093] The beacon terminal 23 is cascaded with the optical transmitting antenna 15 in the optoelectronic payload system 1 in the form of optical fiber to generate a high-power beacon laser, which is sent to the optical transmitting antenna 15 in the optoelectronic payload system 1 through the optical fiber.

[0094] Implementation Method 6: See Figure 1 This embodiment is described. This embodiment is based on the vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 5, and adds tracking control 24 and ephemeris prediction 25;

[0095] The ephemeris prediction 25 is used to obtain the orbit information of the target satellite, perform orbit recursion, and then send the recursion result to the tracking control 24;

[0096] The tracking control 24 is used to generate a turntable control angle according to the recursive result, and is also used to control the servo turntable 14 according to the turntable control angle to achieve coarse signal tracking and locking, and is also used to control the relay optical unit 11 according to the turntable angle to achieve fine signal tracking and locking.

[0097] In practical application, if Figure 1 As shown, the ephemeris prediction 25 is used to obtain the orbit information of the target satellite, and perform orbit recursion and coordinate system conversion on the satellite orbit information, generate the control sequence required to control the servo turntable 14, and send it to the tracking control 24 through the internal interface.

[0098] The tracking control 24 generates a servo drive signal of the servo turntable 14 in the optoelectronic payload system 1 according to the control sequence, and transmits it to the servo turntable 14 in the optoelectronic payload system 1 in the form of a cable to achieve coarse signal tracking and locking; at the same time, encoder feedback is collected from the servo turntable 14 in the optoelectronic payload system 1 to achieve closed-loop control. It also controls the fast-reflecting galvanometer in the relay optical unit 11 in the optoelectronic payload system to achieve fine signal tracking and locking.

[0099] This embodiment provides a vehicle-mounted mobile ground station for satellite-to-ground laser communications. By accessing the ephemeris forecast, it can predict the orbital position information of the satellite in a subsequent period of time based on the position information of the satellite at a certain moment or an initial moment, based on Kepler's law of planetary motion, and then use it to guide the ground station antenna to capture, track, and align (ATP) the satellite, thereby realizing two-way satellite-to-ground laser link establishment and maintenance, and realizing stable satellite-to-ground laser communication.

[0100] This embodiment provides a vehicle-mounted mobile ground station for satellite-to-ground laser communication, which realizes data decoding of laser signals in optical fibers and locking of coarse and fine signals by adopting an integrated signal processing system; wherein the ephemeris prediction unit, tracking control unit, and servo control unit in the integrated signal processing system adopt an integrated co-processor design, which is conducive to reducing the weight and volume of the entire station, thereby making it possible to integrate the integrated signal processing system into the interior of the cabin system.

[0101] Implementation method 7: See Figure 1 This embodiment is described. This embodiment is based on the vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 6, and adds a communication switch 20, a station control unit 27 and a time system unit 28;

[0102] The communication switch 20 is used to realize data interaction between the optoelectronic load system 1 and the integrated signal processing system 2;

[0103] The station control unit 27 is used to integrate the optoelectronic load system 1 and the integrated signal processing system 2 according to the task sequence to achieve automated control;

[0104] The timing unit 28 is used to receive GPS and Beidou dual-frequency signals and provide accurate timing information.

[0105] In practical application, if Figure 1 As shown, the communication switch 20 is the information transmission center of the ground station system, which is interconnected with the various devices in the optoelectronic payload system 1 and the integrated signal processing system 2 through Ethernet to realize the transmission of control and telemetry information.

[0106] The station control unit 27 is used to integrate the optoelectronic load system 1 and the integrated signal processing system 2 according to the task sequence for automated management and control.

[0107] The time system unit 28 includes a receiving terminal and an antenna. It receives signals from Beidou or the global positioning system GPS, processes and obtains high-precision time information, and transmits it to the above-mentioned optoelectronic payload system 1 and the integrated signal processing system 2 through internal signals, providing high-precision unified time information for the entire station system.

[0108] Implementation Method 8: See Figure 2 This embodiment is described. This embodiment adds a cabin structure and a dome structure to the vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 7.

[0109] The cabin structure is used to carry the optoelectronic payload system 1 and the integrated signal processing system 2;

[0110] The dome structure provides environmental protection for the optoelectronic payload system 1 .

[0111] In practical application, if Figure 2 As shown, a cabin structure and a dome structure are added; the cabin structure is used to carry the optoelectronic payload system 1 and the integrated signal processing system 2; the dome structure provides environmental protection for the optoelectronic payload system 1, so that when the optoelectronic payload system 1 and the integrated signal processing system 2 are in a closed environment, they are not affected by external wind, rain, snow, dust and other environmental factors.

[0112] Implementation method 9: See Figures 2 to 4 This embodiment is described, and the embodiment is to add a cabin control 26 and a second power supply device 29 on the basis of a vehicle-mounted movable ground station for satellite-to-ground laser communication described in Embodiment 8;

[0113] The shelter control 26 is used to realize the opening and closing of the dome structure;

[0114] The second power supply device 29 is used to provide working power for the integrated signal processing system 2 , and is also used to provide working power for the first power supply device 16 .

[0115] In actual application of this embodiment, the cabin control 26 realizes the internal control of the cabin structure, and is also used to control the opening and closing of the dome structure, providing an open working environment for the ground station operation, and providing a closed standby environment for the ground station. When encountering a harsh environment, the dome structure is closed, such as Figure 2 As shown, the photoelectric load system 1 and the integrated signal processing system 2 are in a closed environment and are not affected by external wind, rain, snow, dust, etc. When in use, the dome structure is opened, such as Figure 3 As shown, the optoelectronic payload system 1 is placed in an open environment so that there is no obstruction between the optical receiving antenna 10 and the optical transmitting antenna 15 and the target satellite, so that space laser signals can be transmitted and communicated between the two.

[0116] When used, the cabin structure adopts a vehicle-mounted configuration and can be loaded as a whole on a semi-trailer for transportation, such as Figure 4 As shown, its length, width and height meet the requirements of road transportation. The light and small design and vehicle-mounted configuration will facilitate its vehicle-mounted transportation and vehicle-mounted work, so that it does not need to be built in places with infrastructure, but can be moved at any time and deployed anywhere, with high bandwidth, miniaturization, high mobility, better environmental adaptability, and can avoid extreme weather and atmospheric turbulence, thereby improving utilization efficiency.

[0117] The present embodiment provides a vehicle-mounted movable ground station for satellite-to-earth laser communication, which can be configured as a vehicle and can be loaded as a whole on a semi-trailer for transportation. Its structural dimensions such as length, width and height meet the requirements of road transportation.

[0118] The present embodiment provides a vehicle-mounted movable ground station for satellite-to-earth laser communications. By adopting a lightweight design and a vehicle-mounted configuration, it is convenient for vehicle transportation, so that it does not need to be built in a location with infrastructure. Instead, it can be moved at any time and deployed anywhere. It has high bandwidth, miniaturization, high mobility, better environmental adaptability, can avoid extreme weather and atmospheric turbulence, and improve utilization efficiency.

[0119] Embodiment 10: This embodiment provides a space laser communication method, which is implemented based on a vehicle-mounted movable ground station for satellite-to-ground laser communication as described in any one of embodiments 1 to 9.

[0120] This embodiment provides a vehicle-mounted mobile ground station for satellite-to-ground laser communication, which uses an optoelectronic payload system to collect satellite-to-ground downlink signal lasers, and performs precision tracking control, spot correction, and fiber coupling; uses an integrated signal processing system to decode the data of laser signals in the optical fiber and lock the coarse and fine signals; wherein the optical antenna and optical path of the optoelectronic payload system adopt a light, compact design, and the supporting structure adopts low-density materials and a lightweight design; the ephemeris prediction unit, tracking control unit, and servo control unit in the integrated signal processing system adopt a co-processor integrated design, which is conducive to reducing the weight and volume of the entire station, thereby making it possible to integrate the optoelectronic payload system and the integrated signal processing system into the cabin system. The vehicle-mounted mobile ground station described in this embodiment is used in the space laser communication method to solve the problems in the prior art that the laser communication ground station has high requirements for infrastructure conditions and cannot be moved once deployed.

[0121] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0122] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0123] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A vehicle-mounted mobile ground station for satellite-to-ground laser communication, characterized in that: The ground station comprises an optoelectronic payload system (1) and an integrated signal processing system (2); The photoelectric loading system (1) is rotatable; The optoelectronic payload system (1) is used to collect satellite-to-ground downlink signal lasers, to perform beam reduction and precision tracking control on the signal lasers, to perform spot correction on the signal lasers, and to couple spatial light into optical fibers and send the spatial light to the integrated signal processing system (2). The integrated signal processing system (2) is used to receive the laser signal in the optical fiber, process it, and then send the processed data through the optoelectronic payload system (1); The integrated signal processing system (2) is also used to obtain the orbit information of the target satellite and perform orbit recursion, and control the optoelectronic payload system (1) through the recursion result to respectively achieve the locking of the coarse and fine signals; The optoelectronic payload system (1) comprises an optical receiving antenna (10), a relay optical unit (11), an adaptive optical unit (12) and an optical fiber coupling unit (13); The optical receiving antenna (10) is used to collect satellite-to-ground downlink signal laser, and to send the laser to the relay optical unit (11) after beam shrinking the laser. The relay optical unit (11) is used to perform precision tracking control on the received laser and send it to the adaptive optical unit (12); The adaptive optical unit (12) is used to perform signal spot correction on the received laser and send it to the optical fiber coupling unit (13); The optical fiber coupling unit (13) is used to couple the received spatial light into the optical fiber and send it to the integrated signal processing system (2).

2. A vehicle-mounted mobile ground station for satellite-to-ground laser communication according to claim 1, characterized in that: The optoelectronic payload system (1) further comprises a servo turntable (14), an optical transmitting antenna (15) and a first power supply device (16); The optical transmitting antenna (15) is used to transmit the data processed by the integrated signal processing system (2); The first power supply device (16) is used to provide working power for the equipment in the photoelectric load system (1); The servo turntable (14) is used to drive the equipment in the photoelectric load system (1) to rotate.

3. A vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 2, characterized in that: The optical receiving antenna (10) is implemented by using a large-aperture telescope; The optical transmitting antenna (15) is implemented by using a small-aperture telescope.

4. A vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 3, characterized in that: The integrated signal processing system (2) comprises a signal processing module (21), a data storage module (22) and a beacon terminal (23); The signal processing module (21) is used to receive the laser signal in the optical fiber, and is also used to detect, demodulate and decode the laser signal, and send the decoded data to the data storage module (22) for storage; The beacon terminal (23) is used to generate a high-power beacon laser and send it to the optical transmitting antenna (15); The optical transmitting antenna (15) is used to transmit the decoded data under the action of the high-power beacon laser.

5. The vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 4, characterized in that: The integrated signal processing system (2) also includes tracking control (24) and ephemeris prediction (25); The ephemeris prediction (25) is used to obtain the orbit information of the target satellite, perform orbit recursion, and then send the recursion result to the tracking control (24); The tracking control (24) is used to generate a turntable control angle according to the recursive result, and is also used to control the servo turntable (14) according to the turntable control angle to achieve coarse signal tracking and locking, and is also used to control the relay optical unit (11) according to the turntable angle to achieve fine signal tracking and locking.

6. The vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 5, characterized in that: The integrated signal processing system (2) further comprises a communication switch (20), a station control unit (27) and a time synchronization unit (28); The communication switch (20) is used to realize data interaction between the photoelectric load system (1) and the integrated signal processing system (2); The station control unit (27) is used to integrate the photoelectric load system (1) and the integrated signal processing system (2) according to the task sequence to achieve automated control; The time synchronization unit (28) is used to receive GPS Beidou dual-frequency signals and provide accurate time synchronization information.

7. A vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 6, characterized in that: The ground station also includes a cabin structure and a dome structure; The cabin structure is used to carry the optoelectronic payload system (1) and the integrated signal processing system (2); The dome structure provides environmental protection for the optoelectronic payload system (1).

8. The vehicle-mounted movable ground station for satellite-to-ground laser communication according to claim 7, characterized in that: The integrated signal processing system (2) further comprises a cabin control (26) and a second power supply device (29); The cabin control (26) is used to realize the opening and closing of the dome structure; The second power supply device (29) is used to provide working power for the integrated signal processing system (2), and is also used to provide working power for the first power supply device (16).

9. A space laser communication method, characterized in that: The communication method is implemented based on a vehicle-mounted movable ground station for satellite-to-ground laser communication as described in any one of claims 1-8.

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