阅读说明：本技术 一种基于卫星的激光通信方法 (Laser communication method based on satellite ) 是由 任维佳 杨峰 杜志贵 向晓霞 于 2018-11-07 设计创作，主要内容包括：本发明涉及一种基于卫星的激光通信方法,所述方法包括：在第一通信平台尝试与处于不确定位置的第二通信平台建立通信时,第一通信平台发射激光束指向具有已知位置的第一卫星以请求建立第一通信平台与第一卫星之间的激光通信链路,第一通信平台与第一卫星之间建立激光通信链路之后至少部分地基于第一ATP装置确定第一通信平台的姿态和位置,第一卫星用激光束扫描位于不确定区域的第二通信平台直至激光束照射到第二通信平台并请求在第一卫星与第二通信平台之间建立激光通信链路,第一卫星与第二通信平台之间建立激光通信链路之后至少部分地基于第二ATP装置确定第二通信平台的姿态和位置。(The invention relates to a laser communication method based on a satellite, which comprises the following steps: the method includes the steps of, when a first communication platform attempts to establish communication with a second communication platform at an indeterminate location, the first communication platform emitting a laser beam directed at a first satellite having a known location to request establishment of a laser communication link between the first communication platform and the first satellite, the first communication platform having an attitude and a location determined based at least in part on a first ATP device after the laser communication link is established between the first communication platform and the first satellite, the first satellite scanning a second communication platform located in the indeterminate area with the laser beam until the laser beam impinges on the second communication platform and requests establishment of a laser communication link between the first satellite and the second communication platform, the first satellite having an attitude and a location determined based at least in part on a second ATP device after the laser communication link is established between the first satellite and the second communication platform.)

1. A method for satellite-based laser communication, the method comprising:

upon a first communication platform (100) attempting to establish communication with a second communication platform (200) at an indeterminate location, the first communication platform (100) transmitting a laser beam directed at a first satellite (310) having a known location to request establishment of a laser communication link between the first communication platform (100) and the first satellite (310), the establishment of the laser communication link between the first communication platform (100) and the first satellite (310) being followed by a determination of an attitude and a location of the first communication platform (100) based at least in part on the first ATP device (110),

the first satellite (310) scanning a second communication platform (200) located in the uncertainty area with the laser beam until the laser beam impinges on the second communication platform (200) and requests establishment of a laser communication link between the first satellite (310) and the second communication platform (200), the attitude and position of the second communication platform (200) being determined based at least in part on the second ATP device (210) after the laser communication link is established between the first satellite (310) and the second communication platform (200),

and establishing a laser communication link between the first communication platform (100) and the second communication platform (200) according to the determined posture and position of the first communication platform (100) and the posture and position of the second communication platform (200), and transmitting data between the first communication platform (100) and the second communication platform (200) through the laser communication link established between the first communication platform (100) and the second communication platform (200).

2. The laser communication method of claim 1, wherein the process of determining the pose and position of the first communication platform (100) based at least in part on the first ATP device (110) comprises: obtaining a position of the first satellite (310) from the ephemeris data and/or the registry, obtaining a velocity and a geolocation of the first communication platform (100), obtaining a position of the first satellite (310) as viewed by the first ATP device (110), calculating an attitude and a position of the first communication platform (100) based on the position of the first satellite (310) obtained from the ephemeris data and/or the registry, the obtained velocity and the geolocation of the first communication platform (100), and the obtained position of the first satellite (310) as viewed by the first ATP device (110): and/or

The process of determining the pose and position of the second communication platform (200) based at least in part on the second ATP device (210) comprises: obtaining a position of the first satellite (310) from the ephemeris data and/or the registry, obtaining a velocity and a geolocation of the second communication platform (200), obtaining a position of the first satellite (310) as viewed by the second ATP device (210), calculating an attitude and a position of the second communication platform (200) based on the position of the first satellite (310) obtained from the ephemeris data and/or the registry, the obtained velocity and the geolocation of the second communication platform (200), and the obtained position of the first satellite (310) as viewed by the second ATP device (210).

3. The laser communication method of claim 2, wherein the first communication platform (100) selects the first satellite (310) from the ephemeris data or the registry before the first communication platform (100) transmits a laser beam directed at the first satellite (310) having a known location to request establishment of the laser communication link between the first communication platform (100) and the first satellite (310), the selected first satellite (310) being within a 10mrad field of view of the first ATP device (110) of the first communication platform (100) at the time of the selection.

4. The laser communication method of claim 3, wherein the first communication platform (100) further comprises a third ATP device (120), the second communication platform (200) further comprises a fourth ATP device (220), after establishing the laser communication link between the first communication platform (100) and the second communication platform (200), the first satellite (310) selectively disconnects the laser communication link established between it and the first communication platform (100) and/or the second communication platform (200), and after at least one of the first communication platform (100) and the second communication platform (200) disconnects its established laser communication link with the first satellite (310), the first communication platform (100) and the second communication platform (200) determine a pose and a position of each other at least in part by a third ATP device (120) and a fourth ATP device (220).

5. The laser communication method of claim 4, wherein the process of the first satellite (310) selectively disconnecting the laser communication link established between it and the first communication platform (100) and/or the second communication platform (200) comprises:

after establishing the laser communication link between the first communication platform (100) and the second communication platform (200), the first satellite (310) analyzes the movement characteristics of the first communication platform (100) and the second communication platform (200);

the first satellite (310) selects and executes one of the following ways according to the movement characteristics of the first communication platform (100) and the second communication platform (200):

while the first communication platform (100) and the second communication platform (200) are both in a mobile state relative to the earth, the first satellite (310) maintains a laser communication link established with the first communication platform (100) and the second communication platform (200);

when one of the first communication platform (100) and the second communication platform (200) is in a static state relative to the earth, the first satellite (310) disconnects the laser communication link established by the first satellite and the first communication platform (100) or the second communication platform (200) in the static state;

when the first communication platform (100) and the second communication platform (200) are both in a static state relative to the earth, the first satellite (310) disconnects the laser communication link established with the first communication platform (100) and the second communication platform (200).

6. The laser communication method according to claim 5, wherein before the first satellite (310) disconnects the laser communication link with the first communication platform (100) or the second communication platform (200) in the stationary state, a request for disconnecting the laser communication link is sent to the first communication platform (100) or the second communication platform (200) in the stationary state;

in response to the request for disconnecting the laser communication link, at least one of the first communication platform (100) and the second communication platform (200) predicts disconnection of the laser communication link established between the first communication platform (100) and the second communication platform (200) within a first preset time period after disconnection based on a geographic information model and a trajectory prediction;

when at least one of the first communication platform (100) and the second communication platform (200) predicts that the disconnection times of a laser communication link established between the first communication platform (100) and the second communication platform (200) within a first preset time length after disconnection is greater than or equal to a preset time threshold value based on a geographic information model and trajectory prediction, the first communication platform (100) or the second communication platform (200) in a static state rejects the request of the first satellite (310);

when at least one of the first communication platform (100) and the second communication platform (200) predicts that the disconnection times of the laser communication link established between the first communication platform (100) and the second communication platform (200) within a first preset time period after disconnection is less than a preset time threshold value based on a geographic information model and a track prediction, the first communication platform (100) or the second communication platform (200) in a static state receives a request of the first satellite (310).

7. The laser communication method according to claim 1, wherein determining the pose and position of at least one of the first communication platform (100) and the second communication platform (200) is done before establishing the laser communication link between the first communication platform (100) and the second communication platform (200), and after determining the pose and position of the first communication platform (100) or the second communication platform (200) is done, the second communication platform (200) or the first communication platform (100) having no determined pose and position emits a laser beam scan towards the first communication platform (100) or the second communication platform (200) having determined pose and position to attempt to establish the laser communication link between the first communication platform (100) and the second communication platform (200).

8. The laser communication method according to claim 7, wherein in the process that the second communication platform (200) or the first communication platform (100) of which the posture and the position are not determined emits the laser beam toward the first communication platform (100) or the second communication platform (200) of which the posture and the position are determined in an attempt to establish the laser communication link between the first communication platform (100) and the second communication platform (200), the process of determining the second communication platform (200) or the first communication platform (100) of which the posture and the position are not determined is not terminated until the attempt to establish the laser communication link between the first communication platform (100) and the second communication platform (200) is successful or the system determines the posture and the position of the second communication platform (200) or the first communication platform (100) of which the posture and the position are not determined.

9. The laser communication method according to claim 4, wherein before the successful establishment of the laser communication link between the first communication platform (100) and the second communication platform (200), the absolute attitude of the first communication platform (100) and the absolute pointing towards the second communication platform (200) are established by using the first ATP device (110) and the third ATP device (120) to compensate for beam drift of the laser beam emitted by the first communication platform (100); and/or

Before a laser communication link is successfully established between the first communication platform (100) and the second communication platform (200), an absolute attitude and an absolute pointing direction of the second communication platform (200) towards the first communication platform (100) are established by using the second ATP device (210) and the fourth ATP device (220) to compensate for a beam drift of a laser beam emitted by the second communication platform (100).

10. The laser communication method according to claim 1, wherein the first satellite (310) is capable of invoking at least one satellite (300) of the plurality of satellites (300) and/or at least one ground station (400) of the plurality of ground stations (400) to scan the second communication platform (200) located in the uncertainty area with the laser beam until one of the satellites (300) or one of the ground stations (400) illuminates the second communication platform (200) with the laser beam and notifies the first satellite (310), whereby the first satellite (310) illuminates the second communication platform (200) with the laser beam to establish the laser communication link between the first satellite (310) and the second communication platform (200).

Technical Field

The invention relates to the field of satellite communication, in particular to a laser broadcast communication system based on a satellite.

Background

Satellite communication is a combination of aerospace, communication, information and new material technologies, is one of the world high precision technologies, and embodies the comprehensive strength of the state in the high and new technology fields in the information age.

Currently, a satellite-based laser communication system is a communication system established from a satellite to a ground station or from an aircraft to a ground station. For example, chinese patent publication No. CN107707297A discloses an airborne laser communication system, which is characterized in that: the system comprises at least one satellite-borne system, an optical transceiver and an electric cabinet, wherein the satellite-borne system is arranged on a satellite; the system comprises at least one airborne system, a power supply system and a control system, wherein the airborne system is arranged on an aircraft and comprises an optical transceiver, an electric cabinet and a bracket for installing the optical transceiver and the electric cabinet; the ground system is arranged on the ground and comprises an optical transceiver and an electric cabinet; the satellite-borne system is used for realizing bidirectional laser communication with an airborne system and a ground system; the satellite-borne system, the airborne system and the ground system comprise positioning systems for initial pointing, and the optical transceivers of the satellite-borne system, the airborne system and the ground system comprise communication transmitting modules, communication receiving modules, capturing, aiming and tracking modules and optical antennas; the light emitted by the communication emission module is emitted through the optical antenna after passing through the capturing aiming tracking module; light received by the optical antenna is received by the communication receiving module after passing through the capturing aiming tracking module; the acquisition aiming tracking module realizes the establishment and maintenance of a laser communication link between the acquisition aiming tracking module and an optical transceiver of a communication counterpart. However, this application is not applicable to establishing communication between a land or water mobile device and an air mobile device. Since the posture and position of both may vary and the two parties to communicate may not be aware of where the other is. Therefore, there is a need for improvements in the art to address the problem of how to quickly establish a laser communication link between the two in such situations.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a laser communication system based on a satellite, wherein a first communication platform establishes a laser communication link with a first satellite to determine the attitude and the position of the first communication platform, the first satellite assists in scanning to search a second communication platform in an uncertain range to determine the attitude and the position of the second communication platform, and then the laser communication link is quickly established between the first communication platform and the second communication platform by utilizing the determined attitude and the position of the first communication platform and the attitude and the position of the second communication platform.

In accordance with a preferred embodiment, a satellite-based laser communication system comprises: the satellite communication system comprises a satellite communication network consisting of a plurality of satellites, a first communication platform and a second communication platform, wherein the first communication platform comprises a first ATP device, the second communication platform comprises a second ATP device, a carrier of one or one of the first communication platform and the second communication platform can move on the ground or on the water, and a carrier of the other or the other of the first communication platform and the second communication platform can move in the air; when a first communication platform attempts to establish communication with a second communication platform at an uncertain location, the first communication platform emits a laser beam directed at a first satellite having a known location to request establishment of a laser communication link between the first communication platform and the first satellite, the first communication platform after establishing the laser communication link with the first satellite determines an attitude and a location of the first communication platform based at least in part on a first ATP device, the first satellite scans a second communication platform located in the uncertain region with the laser beam until the laser beam impinges on the second communication platform and requests establishment of the laser communication link between the first satellite and the second communication platform, the first satellite after establishing the laser communication link with the second communication platform determines an attitude and a location of the second communication platform based at least in part on a second ATP device, the attitude and the location of the first communication platform and the attitude and the location of the second communication platform are determined based on the determined attitude and location of the first communication platform and the attitude and location of the second communication platform, and establishing a laser communication link between the first communication platform and the second communication platform, and transmitting data between the first communication platform and the second communication platform through the laser communication link established between the first communication platform and the second communication platform.

According to a preferred embodiment, determining the attitude and position of at least one of the first and second communication platforms is done before establishing the laser communication link between the first and second communication platforms, and after determining the attitude and position of the first or second communication platform is done, the second or first communication platform, having no determined attitude and position, emits a laser beam scan towards the first or second communication platform having determined attitude and position to attempt to establish the laser communication link between the first and second communication platforms.

According to a preferred embodiment, in the course of the second communication platform or the first communication platform of undetermined attitude and position emitting a laser beam towards the first communication platform or the second communication platform of determined attitude and position in an attempt to establish a laser communication link between the first communication platform and the second communication platform, the process of determining the second communication platform or the first communication platform of undetermined attitude and position is not terminated until the attempt to establish a laser communication link between the first communication platform and the second communication platform is successful or the system determines the attitude and position of the second communication platform or the first communication platform of undetermined attitude and position.

According to a preferred embodiment, the first communication platform further comprises a third ATP device, the second communication platform further comprises a fourth ATP device, the first satellite selectively disconnects the laser communication link established between it and the first communication platform and/or the second communication platform after the laser communication link is established between the first communication platform and the second communication platform, and the first communication platform and the second communication platform determine the attitude and position of each other at least in part by the third ATP device and the fourth ATP device after at least one of the first communication platform and the second communication platform disconnects the laser communication link established between it and the first satellite.

According to a preferred embodiment, the process of the first satellite selectively disconnecting the laser communication link established between the first satellite and the first communication platform and/or the second communication platform comprises: after a laser communication link is established between a first communication platform and a second communication platform, a first satellite analyzes the movement characteristics of the first communication platform and the second communication platform; the first satellite selects and executes one of the following modes according to the movement characteristics of the first communication platform and the second communication platform: when the first communication platform and the second communication platform are both in a moving state relative to the earth, the first satellite maintains a laser communication link established with the first communication platform and the second communication platform; when one of the first communication platform and the second communication platform is in a static state relative to the earth, the first satellite disconnects the laser communication link established by the first satellite and the first communication platform or the second communication platform in the static state; when the first communication platform and the second communication platform are both in a static state relative to the earth, the first satellite breaks a laser communication link established between the first satellite and the second satellite.

According to a preferred embodiment, before the first satellite disconnects the laser communication link established between the first satellite and the first communication platform or the second communication platform in the static state, a request for disconnecting the laser communication link needs to be sent to the first communication platform or the second communication platform in the static state; in response to the request for disconnecting the laser communication link, at least one of the first communication platform and the second communication platform predicts disconnection conditions of the laser communication link established between the first communication platform and the second communication platform within a first preset time length after disconnection based on a geographic information model and a track prediction; when at least one of the first communication platform and the second communication platform judges that the disconnection times of a laser communication link established between the first communication platform and the second communication platform in a first preset time after disconnection are greater than or equal to a preset time threshold value based on a geographic information model and a track prediction, the first communication platform or the second communication platform in a static state rejects the request of the first satellite; when at least one of the first communication platform and the second communication platform predicts that the disconnection times of a laser communication link established between the first communication platform and the second communication platform in a first preset time after disconnection is smaller than a preset time threshold value based on a geographic information model and a track prediction, the first communication platform or the second communication platform in a static state receives a request of a first satellite.

According to a preferred embodiment, the process of determining the pose and position of the first communication platform based at least in part on the first ATP device comprises: obtaining a position of the first satellite from the ephemeris data and/or the registry, obtaining a velocity and a geolocation of the first communication platform, obtaining a position of the first satellite viewed by the first ATP device, calculating an attitude and a position of the first communication platform based on the position of the first satellite obtained from the ephemeris data and/or the registry, the obtained velocity and the geolocation of the first communication platform, and the obtained position of the first satellite viewed by the first ATP device: and/or determining the pose and position of the second communication platform based at least in part on the second ATP device comprises: the method includes acquiring a position of a first satellite from ephemeris data and/or a registry, acquiring a velocity and a geolocation of a second communications platform, acquiring a position of the first satellite viewed by a second ATP device, and calculating an attitude and a position of the second communications platform based on the position of the first satellite acquired from the ephemeris data and/or the registry, the acquired velocity and the geolocation of the second communications platform, and the acquired position of the first satellite viewed by the second ATP device.

According to a preferred embodiment, the first communication platform selects a first satellite from the ephemeris data or registry prior to the first communication platform transmitting a laser beam directed at the first satellite having a known location to request establishment of a laser communication link between the first communication platform and the first satellite, the selected first satellite being within a 10mrad field of view of the first ATP device of the first communication platform at the time of the selection.

According to a preferred embodiment, before a successful establishment of a laser communication link between the first communication platform and the second communication platform, an absolute attitude and an absolute pointing direction of the first communication platform towards the second communication platform are established by using the first ATP device and the third ATP device to compensate for a beam drift of a laser beam emitted by the first communication platform; and/or before a successful establishment of a laser communication link between the first communication platform and the second communication platform, establishing an absolute attitude and an absolute pointing direction of the second communication platform towards the first communication platform by using the second ATP device and the fourth ATP device to compensate for beam drift of a laser beam emitted by the second communication platform.

According to a preferred embodiment, the system further comprises a plurality of ground stations, the first satellite being capable of calling at least one of the plurality of satellites and/or at least one of the plurality of ground stations to scan the second communication platform located in the area of uncertainty with the laser beam until one of the satellites or one of the ground stations illuminates the second communication platform with the laser beam and informs the first satellite, the first satellite thereby illuminating the second communication platform with the laser beam to establish the laser communication link between the first satellite and the second communication platform.

Drawings

FIG. 1 is a simplified schematic diagram of a preferred embodiment of the present invention; and

fig. 2 is a simplified schematic diagram of another preferred embodiment of the present invention.

List of reference numerals

100: the first communication platform 110: first ATP device

120: third ATP device 200: second communication platform

210: second ATP device 220: fourth ATP device

300: the satellite 310: first satellite

320: the second satellite 400: ground station

410: the microwave station 420: optical station

Detailed Description

This is described in detail below with reference to figures 1 and 2.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, the term "plurality", if any, means two or more unless specifically limited otherwise.