CN109787677B - Handheld terminal based on low-earth-orbit satellite optical communication system - Google Patents

Handheld terminal based on low-earth-orbit satellite optical communication system Download PDF

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Publication number
CN109787677B
CN109787677B CN201811622149.8A CN201811622149A CN109787677B CN 109787677 B CN109787677 B CN 109787677B CN 201811622149 A CN201811622149 A CN 201811622149A CN 109787677 B CN109787677 B CN 109787677B
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satellite
low
hand
communication link
laser
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CN109787677A (en
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任维佳
杨峰
杜志贵
陈险峰
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Changsha Tianyi Space Technology Research Institute Co ltd
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Changsha Tianyi Space Technology Research Institute Co ltd
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Abstract

The invention relates to a handheld terminal based on a low-earth orbit satellite optical communication system, which comprises a capturing, tracking and aiming device, a first laser communication link and a second laser communication link, wherein the capturing, tracking and aiming device can carry out posture transformation to capture a laser beam emitted by a first low-earth orbit satellite, so that the handheld terminal can establish the first laser communication link with the low-earth orbit satellite; in the case that the hand-held terminal establishes the first laser communication link with the first low-orbit satellite, the first low-orbit satellite transmits first information of the hand-held terminal to the geostationary satellite having a determined position so that the laser beam emitted by the geostationary satellite can cover the hand-held terminal, and the first low-orbit satellite transmits second information of the first geostationary satellite establishing the second laser communication link with the hand-held terminal to the hand-held terminal, so that the hand-held terminal can select one of the first geostationary satellites with which the second laser communication link can be established based on its own attributes and adjust the laser beam emitted by the attitude acquisition geostationary satellite of the acquisition tracking sighting device to establish the second laser communication link anytime and anywhere.

Description

Handheld terminal based on low-earth-orbit satellite optical communication system
Technical Field
The invention relates to the technical field of satellite communication, in particular to a handheld terminal based on a low-earth-orbit satellite optical communication system.
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. The satellite communication industry, as an important component of the information communication industry, plays an increasingly important role in the construction of national information infrastructure, the realization of universal services, the creation of a harmonious information society, and the national security strategy.
With the increasing frequency of human maritime activities, the role of maritime emergency communication guarantee in maritime activities is more and more obvious, and the maritime emergency communication guarantee is a necessary way to the maritime forcing country. However, in land communications, which are currently developed, ocean communications are deficient in coverage, communication quality, and the like. The marine emergency response window has short time, requires the rapid establishment of field communication, and provides a very high request for the rapid response of the emergency communication. In view of this, there is a need for a marine communication device that can quickly establish a communication connection.
For example, a portable general aviation communication handheld terminal disclosed in chinese patent publication No. CN108390714A includes an information acquisition processing module and a satellite telephone voice communication module, where the information acquisition processing module includes a central processing unit, a positioning information acquisition unit, a message receiving and sending unit, an ADSB new type acquisition unit, and a storage unit; the output end of the positioning information acquisition unit is electrically connected with the input end of the central processing unit in a one-way mode, the output end of the message transceiving unit is electrically connected with the input end of the central processing unit in a one-way mode, and the output end of the ADSB novel acquisition unit is electrically connected with the input end of the central processing unit in a one-way mode. The invention avoids the inconvenience of voice communication in ground networks such as forests, deserts, oceans and the like and special environment areas which can not be covered by 2G/3G/4G, and solves the problems that the existing hand-held terminal does not have a satellite communication function, can not carry out voice communication without the help of a ground base station and has large communication limitation because the coverage rate of the base station is limited.
For example, chinese patent publication No. CN207835450U discloses a field portable satellite communication station, which is used to solve the problem that the prior art cannot perform field satellite communication in emergency rescue tasks. The utility model discloses an including haulage vehicle, the switch board, power supply system and satellite system, power supply system includes generator and generator drum, the switch board includes the switch board main part, a computer, the network switch, satellite modem, voice gateway, the video conference terminal, commercial power input interface, commercial power output interface, HDMI output port, HDMI input port, left audio output port, right audio output port, audio input port, network interface, telephone interface, BUC interface, the LNB interface, the stereo set, the permission microphone, the display screen, satellite phone, satellite antenna base and satellite antenna.
For example, chinese patent publication No. CN104637348A discloses a portable emergency control system and an emergency control method thereof. The system is used for controlling the aircraft in the environment without a fixed control center, adopts a multi-protocol converter to be connected with the fixed control center, the multi-protocol converter is connected with a communication server, and the communication server is connected with an ADS-B and GPS receiving unit and a satellite communication unit and is connected with the fixed control center through optical fibers; the communication server transmits information from the multi-protocol converter, the ADS-B and GPS receiving unit, the satellite communication unit and the fixed control center to the processing terminal; the processing terminal processes the received data to obtain real-time flight dynamics and conducts command control through the air command radio station according to the real-time flight dynamics; command control is carried out between the air command radio station and the aircraft in a voice communication mode, meanwhile, conversation voice data sent by the air command radio station enter the processing terminal through an audio input line, and the processing terminal stores the conversation voice data.
For example, chinese patent publication No. CN202014248U discloses a full backpack field satellite emergency workstation, which includes an information processor for processing data and exchanging data information; the network manager is used for managing a transmission network of the field satellite emergency workstation; the satellite transmission module is respectively connected with the information processor and the network manager and is connected with the portable satellite antenna equipment through a radio frequency cable; the service transmission module is used for inputting the acquired geological disaster condition information into the information processor and exchanging information with the information processor. The system integrates data communication, voice communication and video communication required by a field disaster site, is suitable for various different disaster sites, and accords with the application of functions such as service emergency call, data transmission, video monitoring, video conference, OA and the like; in addition, the weight is light, and the utility model is suitable for being carried by a single person to go out.
For example, chinese patent publication No. CN106533484A discloses a hand-held satellite terminal in vehicle mode. The system comprises a display screen module, an application processor module, a satellite communication processor module, a local antenna, a terminal equipment structure shell, a terminal antenna switching device and a vehicle-mounted antenna; the display screen module is connected with the application processor module through an FPC (flexible printed circuit) connecting wire, the application processor module is connected with the satellite communication processor module, the satellite communication processor module is connected with the antenna switching device, and the display screen module, the application processor module, the satellite communication processor module and the local antenna are connected with the terminal equipment structure shell; the terminal antenna switching device is connected with the terminal equipment structure shell; the terminal equipment structure shell is connected with the vehicle-mounted antenna through the terminal antenna switching device.
For example, chinese patent publication No. CN101938287B discloses a hand-held satellite communication terminal and a method for the terminal to guide a user to align an antenna with a satellite. The terminal comprises a main control chip, a satellite communication functional block and external equipment which are respectively connected with the main control chip through control and data interfaces, display equipment which is connected with the main control chip through a display interface, a GPS positioning module, a magnetic field sensor and an acceleration sensor, wherein the GPS positioning module is connected with the main control chip through a UART interface; the magnetic field sensor is connected with the main control chip through an I2C interface; the acceleration sensor is connected with the main control chip through the SPI interface. The method is characterized in that the directions of the satellite and the antenna are calculated in real time and displayed on a terminal display interface in a graphic mode, and a user can be guided to conveniently, quickly and intuitively point the antenna to the direction of the satellite, so that the problems that a better communication effect is obtained when the satellite communication terminal is used in the field, and the operation of pointing the antenna to the satellite by the ground satellite communication terminal to determine the position of the satellite is inconvenient (more auxiliary equipment, time-consuming calculation and ambiguous antenna pointing) are solved.
For example, in a mobile satellite communication system handheld terminal disclosed in chinese patent publication No. CN204031165U, a radio frequency shield is disposed between a baseband board and a radio frequency board; the back shell is provided with a back clamp and is fixedly arranged on the back shell through a movable shaft; the air bag module is arranged and consists of at least one gas generator and a contraction air bag arranged at the outer edge of the handheld terminal; be provided with the metal dust screen on the sound outlet cross-section, be equipped with antenna body and feed on the mainboard, the metal dust screen forms the radio frequency with the feed and is connected. The radio frequency shielding cover is additionally arranged between the baseband board and the radio frequency board, so that the mutual interference between the baseband board and the radio frequency board can be effectively eliminated, and the working stability of the handheld terminal is improved; after the metal dustproof net and the antenna feed source form radio frequency connection, the flexibility and the degree of freedom of the handheld terminal antenna wiring are improved.
For example, chinese patent publication No. CN108281768A discloses a dual-band antenna and a terminal thereof. The terminal comprises a mainboard, a cluster communication module, a satellite telephone communication module and a dual-frequency antenna. The dual-frequency antenna comprises a spiral arm radiator, a phase power divider, a circular polarization/linear polarization combiner, a common mode/differential film combiner and an RF feeder line; wherein, the spiral arm radiator is connected with the phase power divider; the circular polarization/linear polarization combiner is connected with the phase power divider in parallel and is connected to the common-mode/differential-film combiner through an RF feeder line; the linearly polarized signals are transmitted in a common mode along the RF feed to the circular polarization/linear polarization combiner, and the circularly polarized signals are transmitted in a differential mode along the RF feed to the phase power divider.
For example, chinese patent publication No. CN108832991A discloses a satellite network voice communication optimization system. The satellite communication system comprises a user terminal, a satellite antenna and a satellite communication module, wherein the user terminal is used for receiving voice signals; the satellite communication module is used for establishing voice call connection, coding and decoding of voice signals and transmitting and receiving of the voice signals; the voice gateway is used for sending voice signals to a specified user terminal to realize a call function; the invention also discloses a voice communication method based on the satellite network. The invention effectively solves the problem of voice communication in ground networks such as forests, deserts, oceans and the like and special environment areas which can not be covered by 2G/3G/4G, and plays an important role in on-site rescue and report.
After research on the prior art, most of the current handheld terminals are applied to the field of electromagnetic wave communication, and relatively few are applied to the field of laser communication.
Disclosure of Invention
When the low-orbit satellite establishes the laser communication link with the handheld terminal, the laser communication link between the low-orbit satellite and the handheld terminal is frequently switched due to different angular velocities between the earth-orbit satellite and the earth, and the established laser communication link is in middle-section communication during switching, which is very disadvantageous to the field of emergency communication. Therefore, in order to maintain the communication connection between the synchronous satellite and the handheld terminal anytime and anywhere, the synchronous satellite and the handheld terminal can establish a good communication connection, but the distance between the synchronous satellite and the earth is about 3.6 kilometers, and the distance between the low-orbit satellite and the earth is about 200-2000 kilometers.
Aiming at the defects of the prior art, the invention provides a handheld terminal based on a low-earth-orbit satellite optical communication system. The beacon light emitted by the earth orbit satellite can be captured in a short time, the communication connection can be established preliminarily, and after the preliminary communication connection is established, the handheld terminal is connected with the synchronous satellite through the attitude adjustment to establish stable communication connection, so that emergency communication is established.
According to the handheld terminal based on the low-earth-orbit satellite optical communication system, the capturing, tracking and aiming device can perform posture transformation to capture the laser beam emitted by the first low-earth-orbit satellite, so that the handheld terminal can establish a first laser communication link with the first low-earth-orbit satellite; in the case where the handheld terminal establishes a first laser communication link with the first low earth orbit satellite, the first low earth satellite communicates first information of the hand-held terminal to at least one geostationary satellite having a determined position capable of covering the hand-held terminal with the emitted laser beam before the hand-held terminal is not covered by the emitted laser beam, and the first low earth orbit satellite communicates second information of a first synchronization satellite capable of establishing a second laser communication link with the hand-held terminal to the hand-held terminal via the first laser communication link, so that the hand-held terminal can select one of the first synchronous satellites with which the second laser communication link can be established and adjust the attitude of the acquisition tracking sighting device based on the self-attribute, so that the hand-held terminal can capture the laser beam emitted by the first synchronous satellite to establish the second laser communication link to form an emergency communication link at any time and any place.
According to a preferred embodiment, in the case that the first low-orbit satellite cannot select at least one of the geostationary satellites based on the ephemeris data and the first information, the first low-orbit satellite selects a second low-orbit satellite based on the ephemeris data and the first information as a satellite which establishes a third laser communication link with the handheld terminal in the case that the first low-orbit satellite cannot establish the first laser link with the handheld terminal, so that the handheld terminal can establish a communication connection with the satellite anytime and anywhere; wherein the first low-orbit satellite establishes a communication connection with the second low-orbit satellite to enable the second low-orbit satellite to at least partially acquire the first information of the handheld terminal to enable the second low-orbit satellite to establish the third laser communication link with the handheld terminal when the first low-orbit satellite is not transmitting the laser beam over the handheld terminal.
According to a preferred embodiment, before the first synchronous satellite establishes the second laser communication link with the handheld terminal, the first low-orbit satellite selects at least one synchronous satellite based on ephemeris data and the first information and establishes a communication connection with the synchronous satellite, and after receiving third information fed back by the synchronous satellite, the first low-orbit satellite determines the first synchronous satellite as the synchronous satellite establishing the second laser communication link with the handheld terminal; in the case where the first low-orbit satellite cannot determine that the first synchronous satellite can serve as the synchronous satellite for establishing the second laser communication link with the handheld terminal, the first low-orbit satellite selects a second low-orbit satellite as a satellite for establishing a third laser communication link with the handheld terminal on the basis of ephemeris data and the first information in the case where the first low-orbit satellite cannot establish the first laser link with the handheld terminal, so that the handheld terminal can establish a communication connection with the satellite at any time and any place.
According to a preferred embodiment, the acquisition tracking aiming device performs attitude adjustment through a mechanical construction module during the process of acquiring the laser beam emitted by the first low-orbit satellite, wherein the mechanical construction module comprises a bearing part and an attitude adjusting part, the capturing, tracking and aiming device is fixedly arranged on the bearing part, the bearing part is movably connected with the attitude adjusting part, so that the capturing, tracking and aiming device can adjust the azimuth angle and/or elevation angle of the capturing, tracking and aiming device under the action of the attitude adjusting part, when the acquisition tracking aiming device acquires the laser beam emitted by the first low-orbit satellite, the attitude adjusting part stops moving, and the acquisition tracking sighting device communicates the azimuth and elevation angles to the first low earth orbit satellite via the first laser communication link; the first low earth satellite is capable of inverting a position of the handheld terminal based on the azimuth and elevation angles and capable of communicating information to the handheld terminal based on the first laser communication link.
According to a preferred embodiment, said first low earth satellite communicates said azimuth and said elevation to at least one geostationary satellite, the at least one geostationary satellite generates the third information feedback to the first low earth orbit satellite based on the azimuth, the elevation and its position information, the first low earth orbit satellite selects the first synchronous satellite as the satellite establishing the second laser communication link with the handheld terminal and transmits the third information fed back by the first synchronous satellite to the handheld terminal through the first laser communication link, the handheld terminal adjusts the direction angle and/or the elevation angle through the attitude adjustment part based on the third information so that the acquisition tracking aiming device can acquire the laser beam generated by the first synchronous satellite, thereby the handheld terminal can establish the second laser communication link with the first synchronous satellite.
According to a preferred embodiment, when the handheld terminal establishes the first laser communication link with the first low-orbit satellite or the third laser communication link with the second low-orbit satellite or the second laser communication link with the first synchronization satellite, the first low-orbit satellite or the second low-orbit satellite or the first synchronization satellite transmits the position information of the handheld terminal to at least one of a GPS satellite or a beidou satellite, and the at least one of the GPS satellite or the beidou satellite provides the position information based on the handheld terminal to navigation information, and the navigation information is transmitted to the handheld terminal through the first laser communication link or the second laser communication link or the third laser communication link.
According to a preferred embodiment, the capturing, tracking and aiming device comprises a data transmitting module, a polarization beam splitter, a first beam splitter, a second beam splitter, a capturing and detecting module, a tracking and detecting module, a liquid crystal optical phased array antenna and an adaptive controller; the data transmitting module is used for generating a beam divergence angle thetaM1And to the polarization beam splitter; the polarization beam splitter is used for separating the transmitting beam and the receiving beam, transmitting the receiving beam received from the adaptive liquid crystal optical phased array antenna to the first beam splitter, and transmitting the transmitting beam received from the data transmitting module to the adaptive liquid crystal optical phased array antenna; the first beam splitter is used for receiving the received light beam sent by the polarization beam splitter and is divided into two parts, wherein one part is sent to an external data receiving module, and the other part is sent to the second beam splitter; the second beam splitter is used for splitting the received light beam sent by the first beam splitter into two parts, wherein one part is sent to the capturing detection module, and the other part is sent to the tracking detection module; the capture detection module detects the received light beam to obtain a first visual axis error signal ecAnd a first received optical power PrcAnd sending to the adaptive controller; the tracking detection module is used for receiving the light beamDetecting to obtain a second visual axis error signal efAnd a second received optical power PrfAnd sent to the adaptive controller.
According to a preferred embodiment, when the handheld terminal establishes the first laser communication link with the first low-orbit satellite or the third laser communication link with the second low-orbit satellite or the second laser communication link with the first synchronization satellite, the handheld terminal sends out a beacon signal and establishes communication connections with the other communication devices with determined positions to establish a local area network, and the handheld terminal serves as a relay station to establish communication connections between the first low-orbit satellite, the second low-orbit satellite and/or the first synchronization satellite and the other communication devices.
According to a preferred embodiment, the invention also discloses an optical communication method between the satellite and the handheld terminal, which mainly comprises that a capturing, tracking and aiming device on the handheld terminal can carry out attitude transformation to capture the laser beam emitted by the first low-orbit satellite, so that the handheld terminal can establish a first laser communication link with the low-orbit satellite; in the case where the handheld terminal establishes a first laser communication link with the first low earth orbit satellite, the first low earth satellite communicates first information of the hand-held terminal to at least one geostationary satellite having a determined position such that the hand-held terminal is covered by a laser beam emitted by the geostationary satellite, and the first low earth orbit satellite is capable of communicating second information of a first synchronization satellite establishing a second laser communication link with the hand-held terminal to the hand-held terminal via the first laser communication link, so that the hand-held terminal can select one of the first synchronous satellites with which the second laser communication link can be established and adjust the attitude of the acquisition tracking sighting device based on the self-attribute, the hand-held terminal is thereby able to capture the laser beam emitted by the geostationary satellite to establish the second laser communication link at any time and any place.
According to a preferred embodiment, in the case that the first low-orbit satellite cannot select at least one of the geostationary satellites based on the ephemeris data and the first information, the first low-orbit satellite selects a second low-orbit satellite based on the ephemeris data and the first information as a satellite which establishes a third laser communication link with the handheld terminal in the case that the first low-orbit satellite cannot establish the first laser link with the handheld terminal, so that the handheld terminal can establish a communication connection with the satellite anytime and anywhere; wherein the first low-earth satellite establishes a communication connection with the second low-earth satellite to enable the second low-earth satellite to at least partially acquire the first information of the handheld terminal.
Drawings
FIG. 1 is a simplified schematic diagram of a preferred embodiment provided by the present invention.
List of reference numerals
10: first low earth satellite 20: synchronous satellite
30: second low earth satellite 20 a: first synchronous satellite
20 b: the second geostationary satellite 40: hand-held terminal
Detailed Description
This is explained in detail below with reference to fig. 1.
In the description of the present invention, the terms "first", "second", "third" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first," "second," "third," and so forth may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
The embodiment also discloses a handheld terminal, which can also be a laser communication terminal, can also be a laser communication terminal based on a low-earth orbit satellite, and can also be an air-ground laser communication terminal based on a satellite, and the equipment can be realized by the system and/or other alternative methods. The apparatus of the present invention may be implemented, for example, by using various components of the method of the present invention.
The handheld terminal 40 of the present embodiment includes an acquisition tracking aiming device (ATP). Preferably, the capture Tracking targeting may be referred to as Acquisition, Tracking and Pointing, i.e. capture Tracking and targeting. Preferably, the capture tracking aiming device may also be referred to as an APT device, a capture aiming tracker, a capture tracking and aiming system, an aiming capture tracking device, and/or a capture tracking and aiming device. For example, to achieve reliable communication between the handheld terminal 40 and the low earth orbit satellite 10, the handheld terminal 40 is first required to capture a light beam from another low earth orbit satellite, called beacon light, and focus the light beam to the center of a detector or antenna, which is called an acquisition or capture body. After the acquisition is completed, the receiving handheld terminal 40 also emits a light beam, and the process of directing the light beam to the low earth orbit satellite emitting the beacon light is called pointing or aiming. The satellite emitting the beacon light also completes the acquisition process accordingly after receiving the light, so that the low earth orbit satellite establishes a communication state with the handheld terminal 40. This precise connection must be maintained for the low earth orbit satellite to communicate with the hand held terminal 40, a process known as tracking or tracking port.
Preferably, as shown in fig. 1, the acquisition tracking sighting device can perform attitude transformation to acquire the laser beam emitted by the first low earth orbit satellite 10, so that the handheld terminal 40 can establish a first laser communication link with the first low earth orbit satellite 10. For example, the first low earth satellite 10 may emit a laser beam to the handheld terminal suspected location. When the handheld terminal 40 or its user is not aware of its actual geographic location, the acquisition tracking sighting device can make attitude adjustments seeking an opportunity that it can establish a first laser communication link with the first low earth orbit satellite 10. For example, the handheld terminal 40 can attempt to capture a laser beam through pose adjustment based on an abnormal situation. When the acquisition tracking sighting device acquires the laser beam emitted by the first low earth satellite 10, the attitude adjustment of the acquisition tracking sighting device is finished so that the handheld terminal 40 can establish the first laser communication link with the low earth satellite.
Preferably, in case the hand-held terminal 40 establishes a first laser communication link with the first low earth orbit satellite 10, the first low earth orbit satellite 10 transfers the first information of the hand-held terminal 40 to at least one geostationary satellite 20 having a determined position so that the laser beam emitted by the geostationary satellite 20 can cover the hand-held terminal 40. Since the geostationary satellite 20 is stationary with respect to the earth above the equator, it has the same angular velocity rotation as the earth. The first low earth orbit satellite 10 has the characteristic of high-speed movement, only short laser communication time can be established with the handheld terminal 40, and if the first information of the handheld terminal 40 establishing the first laser communication link with the first low earth orbit satellite 10 is transmitted to the at least one geostationary satellite 20, the at least one geostationary satellite 20 can establish communication connection with the handheld terminal 40 at any moment, which provides safe and timely guarantee for personnel and equipment working at sea. Preferably, in case the hand-held terminal 40 establishes a first laser communication link with the first low earth orbit satellite 10, the first low earth orbit satellite 10 transfers the first information of the hand-held terminal 40 to at least one geostationary satellite 20 having a determined position, which transmitted laser beam can cover the hand-held terminal 40, before the laser beam transmitted by the first low earth orbit satellite 10 can not cover the hand-held terminal. The first information mainly includes location information and attribute information of the handheld terminal 40. And, the first low earth satellite 10 can transmit the second information of the first synchronous satellite 20a establishing the second laser communication link with the hand-held terminal 40 to the hand-held terminal 40 through the first laser communication link, so that the hand-held terminal 40 can select one of the first synchronous satellites 20a establishing the second laser communication link with it based on its own attributes and adjust the attitude of the acquisition tracking sighting device, and thus, the hand-held terminal 40 can acquire the laser beam emitted from the first synchronous satellite 20a to establish the second laser communication link anytime and anywhere. The geostationary satellite also includes a second geostationary satellite 20b of the type that is capable of establishing a communication link with the hand-held terminal 40, but that is not the optimal geostationary satellite for establishing a communication link with the hand-held terminal 40 for a number of reasons, such as the second geostationary satellite 20b having other services, or its high energy requirement for transmitting laser light for establishing a communication link with the hand-held terminal 40.
Preferably, there are a plurality of mathematical expressions for determining the attitude and position of the object, such as at least one of an Euler angle, an Euler-Rodrigue parameter, a Rodrigue-Gilles vector, a quaternion, and a dual quaternion.
Preferably, the method may comprise: generating an optical frequency comb and a pump signal at a satellite transmitter; modulating an optical frequency comb at a transmitter to produce a data signal and an idle signal that is a phase conjugate of the data signal; attenuating the pump signal at the transmitter; transmitting a communication signal having a data signal, an idle signal, and a pump signal from a satellite through free space; receiving at a receiver a transmitted communication signal from a satellite, the communication signal having a data signal, an idle signal, and an attenuated pump signal; amplifying the data signal and the idle signal at a phase sensitive amplifier in the receiver; and/or demodulating the data signal and the idle signal at the receiver to extract the data.
When the hand-held terminal 40 cannot be covered by the laser beam emitted from the geostationary satellite 20, the hand-held terminal 40 needs to promptly establish a real-time communication connection with the satellite in a timely manner. Preferably, in the case where the first low-orbit satellite 10 cannot select at least one of the geostationary satellites 20 based on the ephemeris data and the first information, the first low-orbit satellite 10 selects the second low-orbit satellite 30 as a satellite that establishes the third laser communication link with the handheld terminal 40 in the case where the first low-orbit satellite 10 cannot establish the first laser link with the handheld terminal 40, so that the handheld terminal 40 can establish a communication connection with the satellite at any time and any place. Preferably, the first low earth satellite 10 establishes a communication connection with the second low earth satellite 30 to enable the second low earth satellite 30 to at least partially acquire the first information of the handheld terminal 40.
Preferably, before the first geostationary satellite 20a establishes the second laser communication link with the handheld terminal 40, the first low-earth satellite 10 selects at least one geostationary satellite 20 and establishes a communication connection with the selected geostationary satellite 20 based on the ephemeris data and the first information, and after receiving the third information fed back by the geostationary satellite 20, the first low-earth satellite 10 determines the first geostationary satellite 20a as the geostationary satellite 20 establishing the second laser communication link with the handheld terminal 40. Preferably, the first low earth orbit satellite 10, upon receiving the first information fed back from the handheld terminal 40, will select at least one geostationary satellite 20 as a candidate satellite for establishing the second laser communication link with the handheld terminal 40 based on the ephemeris data. At this time, the first low earth orbit satellite 10 establishes a communication connection in view of the selected at least one geostationary satellite 20 and transfers the first information fed back by the handheld terminal 40 to the at least one geostationary satellite 20, and at this time, the at least one geostationary satellite 20 generates the third information based on the first information in combination with the current state. For example, the third information includes an agreement or disagreement to establish the second laser link with the handheld terminal 40. The handheld terminal 40 decides and determines the first synchronization satellite 20a as the satellite establishing the second laser link with the handheld terminal 40 based on the third information. In the case where the first low-orbit satellite 10 cannot determine that the first sync satellite 20a can serve as the sync satellite 20 that establishes the second laser communication link with the hand-held terminal 40, the first low-orbit satellite 10 selects the second low-orbit satellite 30 as the satellite that establishes the third laser communication link with the hand-held terminal 40 in the case where the first low-orbit satellite 10 cannot establish the first laser link with the hand-held terminal 40, based on the ephemeris data and the first information, so that the hand-held terminal 40 can establish a communication connection with the satellite at any time and any place.
Preferably, the handheld terminal 40, the first low earth satellite 10 or the first synchronous satellite 20a in the system of the present invention may establish a laser communication link using at least one of a green laser, a blue laser and a red laser. For example, the first laser communication link established between the handheld terminal 40 and the first low earth orbit satellite, the uplink of the data transmitted by the handheld terminal 40 to the first low earth orbit satellite 10 may be green laser, and the downlink of the data transmitted by the first low earth orbit satellite 10 to the handheld terminal 40 may be red laser. And for communication connections between satellites, electromagnetic waves may be used for establishment.
Example 2
This embodiment discloses a mechanical module of the hand-held terminal 40 to enable it to establish a communication connection with an earth-orbiting satellite or a geostationary satellite.
Preferably, the acquisition tracking sighting device performs attitude adjustment through the mechanical configuration module during the process of acquiring the laser beam emitted by the first low earth orbit satellite 10. The mechanical construction module comprises a bearing part and an attitude adjusting part, the capturing, tracking and aiming device is fixedly arranged on the bearing part, and the bearing part is movably connected with the attitude adjusting part, so that the capturing, tracking and aiming device can adjust the azimuth angle and/or the elevation angle of the capturing, tracking and aiming device under the action of the attitude adjusting part, when the capturing, tracking and aiming device captures the laser beam emitted by the first low-orbit satellite 10, the attitude adjusting part stops moving, and the capturing, tracking and aiming device transmits the azimuth angle and the elevation angle to the first low-orbit satellite 10 through the first laser communication link. The first low earth satellite 10 is capable of inverting the position of the handheld terminal 40 based on azimuth and elevation and is capable of communicating information to the handheld terminal 40 based on the first laser communication link. Preferably, the attitude adjustment section includes at least one of a hydraulic module and a gear module communicatively coupled to the adaptive controller.
Preferably, the first low earth orbit satellite 10 transfers the azimuth angle and the elevation angle to the at least one geostationary satellite 20, the at least one geostationary satellite 20 generates third information based on the azimuth angle, the elevation angle and the position information thereof to be fed back to the first low earth orbit satellite 10, the first low earth orbit satellite 10 selects the first geostationary satellite 20a as a satellite for establishing the second laser communication link with the handheld terminal 40 and transfers the third information fed back by the first geostationary satellite 20a to the handheld terminal 40 through the first laser communication link, and the handheld terminal 40 adjusts the direction angle and/or the elevation angle through the attitude adjusting part based on the third information to enable the acquisition and tracking means to acquire the laser beam generated by the first geostationary satellite 20a so that the handheld terminal 40 can establish the second laser communication link with the first geostationary satellite 20 a.
Preferably, the capturing, tracking and aiming device comprises a data transmitting module, a polarization beam splitter, a first beam splitter, a second beam splitter, a capturing and detecting module, a tracking and detecting module, a liquid crystal optical phased array antenna and an adaptive controller. The data transmitting module is used for generating a beam divergence angle thetaM1And sent to the polarization beam splitter. The polarization beam splitter is used for separating the transmitting beam and the receiving beam, transmitting the receiving beam received from the adaptive liquid crystal optical phased array antenna to the first beam splitter, and transmitting the transmitting beam received from the data transmitting module to the adaptive liquid crystal optical phased array antenna. The first beam splitter is used for receiving the received light beam sent by the polarization beam splitter and is divided into two parts, wherein one part is sent to the external data receiving module, and the other part is sent to the second beam splitter. The second beam splitter is used for splitting the received light beam sent by the first beam splitter into two parts, wherein one part is sent to the capturing detection module, and the other part is sent to the tracking detection module. The capture detection module detects the received light beam to obtain a first visual axis error signal ec(t) and a first received optical power PrcAnd sent to the adaptive controller. The tracking detection module is used for detecting the received light beam to obtain a second visual axis error signal ef(t) and a second received optical power PrfAnd sent to the adaptive controller.
Example 3
The embodiment discloses a system for realizing navigation based on an optical communication system of a handheld terminal 40 and a low-earth orbit satellite.
Preferably, when the handheld terminal 40 establishes the first laser communication link with the first low-orbit satellite 10 or the third laser communication link with the second low-orbit satellite 20 or the second laser communication link with the first synchronization satellite 20a, the first low-orbit satellite 10 or the second low-orbit satellite 20 or the first synchronization satellite transmits the position information of the handheld terminal 40 to at least one of a GPS satellite or a beidou satellite, the at least one of the GPS satellite or the beidou satellite provides the position information based on the handheld terminal 40 to the navigation information, and the navigation information is transmitted to the handheld terminal 40 through the first laser communication link or the second laser communication link or the third laser communication link.
Example 4
The embodiment discloses a system for implementing emergency rescue based on an optical communication system of a handheld terminal 40 and a low-earth orbit satellite.
Preferably, when the handheld terminal 40 establishes the first laser communication link with the first low earth orbit satellite 10 or the third laser communication link with the second low earth orbit satellite 20 or the second laser communication link with the first synchronization satellite 20a, the handheld terminal 40 sends out a beacon signal and establishes communication connection with the other communication devices with determined positions to establish a local area network, and the handheld terminal 40 serves as a relay station to establish communication connection with the other communication devices of the first low earth orbit satellite 10, the second low earth orbit satellite 20 and/or the first synchronization satellite 20 a. The method is particularly suitable for emergency rescue at sea. After the handheld terminal 40 establishes communication with the satellite, the handheld terminal 40 establishes connection with other communication devices to establish a point-to-surface rescue system, and the satellite feeds back the information to the intelligent terminal after receiving laser beams emitted by the handheld terminal 40, so that emergency rescue is realized.
Example 5
The present embodiment discloses an optical communication method between a satellite and a handheld terminal 40.
Preferably, the acquisition tracking sighting device on the handheld terminal 40 is capable of performing attitude transformation to acquire the laser beam emitted by the first low earth orbit satellite 10, so that the handheld terminal 40 can establish a first laser communication link with the low earth orbit satellite; in the case where the handheld terminal 40 establishes the first laser communication link with the first low earth orbit satellite 10, the first low earth orbit satellite 10 transfers the first information of the handheld terminal 40 to at least one sync satellite 20 having a determined position so that the laser beam emitted from the sync satellite 20 can cover the handheld terminal 40, and the first low earth orbit satellite 10 can transfer the second information of the first sync satellite 20a establishing the second laser communication link with the handheld terminal 40 to the handheld terminal 40 through the first laser communication link, so that the handheld terminal 40 can select one of the first sync satellites 20a with which the second laser communication link can be established based on its own attributes and adjust the attitude of the acquisition tracking aiming device, whereby the handheld terminal 40 can acquire the laser beam emitted from the sync satellite 20 to establish the second laser communication link anytime anywhere.
Preferably, in the case where the first low-orbit satellite 10 cannot select at least one geostationary satellite 20 based on the ephemeris data and the first information, the first low-orbit satellite 10 selects the second low-orbit satellite 30 based on the ephemeris data and the first information as a satellite that establishes a third laser communication link with the handheld terminal 40 in the case where the first low-orbit satellite 10 cannot establish the first laser link with the handheld terminal 40, so that the handheld terminal 40 can establish a communication connection with the satellite at any time and any place; wherein the first low earth orbit satellite 10 establishes a communication connection with the second low earth orbit satellite 30 to enable the second low earth orbit satellite 30 to at least partially acquire the first information of the handheld terminal 40.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A hand-held terminal based on an optical communication system of low-earth orbit satellites, comprising an acquisition tracking aiming device capable of attitude transformation to acquire a laser beam emitted by a first low-earth orbit satellite (10) so as to enable the hand-held terminal (40) to establish a first laser communication link with the first low-earth orbit satellite (10), characterized in that, in case the hand-held terminal (40) establishes a first laser communication link with the first low-earth orbit satellite (10), the first low-earth orbit satellite (10) transfers a first information of the hand-held terminal (40) to at least one geostationary satellite (20) having a determined position, which can cover the hand-held terminal (40), emitted laser beam before it can not cover the hand-held terminal,
and the first low earth orbit satellite (10) transmits second information of a first synchronization satellite (20a) capable of establishing a second laser communication link with the hand-held terminal (40) to the hand-held terminal (40) through the first laser communication link, so that the hand-held terminal (40) can select one of the first synchronization satellites (20a) capable of establishing the second laser communication link with the hand-held terminal based on the self-attribute and adjust the posture of the acquisition tracking aiming device, thereby the hand-held terminal (40) can acquire the laser beam emitted by the first synchronization satellite (20a) to establish the second laser communication link to form an emergency communication link at any time and any place.
2. The hand-held terminal according to claim 1, characterized in that in case the first low-orbit satellite (10) cannot select at least one of the geostationary satellites (20) based on ephemeris data and the first information, the first low-orbit satellite (10) selects a second low-orbit satellite (30) based on ephemeris data and the first information as a satellite establishing a third laser communication link with the hand-held terminal (40) in case the first low-orbit satellite (10) cannot establish the first laser link with the hand-held terminal (40) so that the hand-held terminal (40) can establish a communication connection with a satellite at any time and any place;
wherein the first low earth orbit satellite (10) establishes a communication connection with the second low earth orbit satellite (30) to enable the second low earth orbit satellite (30) to at least partially acquire the first information of the handheld terminal (40) to enable the second low earth orbit satellite (30) to establish the third laser communication link with the handheld terminal (40) when the first low earth orbit satellite (10) is not emitting a laser beam that covers the handheld terminal (40).
3. The hand-held terminal according to claim 2, wherein the first low-orbit satellite (10) selects and establishes a communication connection with at least one of the geostationary satellites (20) based on ephemeris data and the first information before the first geostationary satellite (20a) establishes the second laser communication link with the hand-held terminal (40), the first low-orbit satellite (10) determines the first geostationary satellite (20a) as the geostationary satellite (20) establishing the second laser communication link with the hand-held terminal (40) after receiving third information fed back by the geostationary satellite (20);
in the case where the hand-held terminal (40) cannot determine that the first synchronization satellite (20a) can serve as the synchronization satellite (20) that establishes the second laser communication link with the hand-held terminal (40), the first low-orbit satellite (10) selects a second low-orbit satellite (30) as a satellite that establishes a third laser communication link with the hand-held terminal (40) in the case where the first low-orbit satellite (10) cannot establish the first laser link with the hand-held terminal (40) based on ephemeris data and the first information, so that the hand-held terminal (40) can establish a communication connection with a satellite at any time and any place.
4. The hand-held terminal according to claim 3, characterized in that the acquisition tracking aiming device performs attitude adjustment by means of a mechanical construction module during acquisition of the laser beam emitted by the first low-earth satellite (10),
wherein the mechanical construction module comprises a bearing part and an attitude adjusting part, the capturing, tracking and aiming device is fixedly arranged on the bearing part, the bearing part is movably connected with the attitude adjusting part, so that the capturing, tracking and aiming device can adjust the azimuth angle and/or the elevation angle of the capturing, tracking and aiming device under the action of the attitude adjusting part, the attitude adjusting part stops moving when the capturing, tracking and aiming device captures the laser beam emitted by the first low-orbit satellite (10), and the capturing, tracking and aiming device transmits the azimuth angle and the elevation angle to the first low-orbit satellite (10) through the first laser communication link;
the first low earth satellite (10) is capable of inverting the position of the handheld terminal (40) based on the azimuth and elevation angles and capable of communicating information to the handheld terminal (40) based on the first laser communication link.
5. The handheld terminal of claim 4 wherein the first low-earth satellite (10) communicates the azimuth and the elevation to at least one geostationary satellite (20), the at least one geostationary satellite (20) generates the third information feedback to the first low-earth satellite (10) based on the azimuth, the elevation and its position information, the first low-earth satellite (10) selects the first geostationary satellite (20a) as the satellite for establishing the second laser communication link with the handheld terminal (40) and communicates the third information feedback from the first geostationary satellite (20a) to the handheld terminal (40) via the first laser communication link,
the handheld terminal (40) adjusts the azimuth angle and/or the elevation angle through the attitude adjustment part based on the third information so that the acquisition tracking aiming device can acquire the laser beam generated by the first synchronous satellite (20a) so that the handheld terminal (40) can establish the second laser communication link with the first synchronous satellite (20 a).
6. The hand-held terminal according to claim 5, characterized in that the hand-held terminal (40), in case the first laser communication link is established with the first low earth orbit satellite (10) or in case the third laser communication link is established with the second low earth orbit satellite (20) or in case the second laser communication link is established with the first synchronization satellite (20a),
the first low earth satellite (10) or the second low earth satellite (20) or the first geostationary satellite will communicate the position information of the handheld terminal (40) to at least one of a GPS satellite or a Beidou satellite,
at least one of the GPS satellites or the Beidou satellites provide handheld terminal (40) based location information to navigation information that is communicated to the handheld terminal (40) via the first laser communication link or the second laser communication link or the third laser communication link.
7. The handheld terminal of claim 6 wherein said acquisition tracking aiming means comprises a data transmission module, a polarizing beam splitter, a first beam splitter, a second beam splitter, an acquisition detection module, a tracking detection module, a liquid crystal optical phased array antenna, and an adaptive controller;
the data transmitting module is used for generating a beam divergence angle thetaM1And to the polarization beam splitter;
the polarization beam splitter is used for separating the transmitting beam and the receiving beam, transmitting the receiving beam received from the adaptive liquid crystal optical phased array antenna to the first beam splitter, and transmitting the transmitting beam received from the data transmitting module to the adaptive liquid crystal optical phased array antenna;
the first beam splitter is used for receiving the received light beam sent by the polarization beam splitter and is divided into two parts, wherein one part is sent to an external data receiving module, and the other part is sent to the second beam splitter;
the second beam splitter is used for splitting the received light beam sent by the first beam splitter into two parts, wherein one part is sent to the capturing detection module, and the other part is sent to the tracking detection module;
the capture detection module detects the received light beam to obtain a first visual axis error signal ec(t) and a first received optical power PrcAnd sending to the adaptive controller;
the tracking detection module is used for detecting the received light beam to obtain a second visual axis error signal ef(t) and a second received optical power PrfAnd sent to the adaptive controller.
8. The hand-held terminal according to claim 7, characterized in that, in the case where the hand-held terminal (40) establishes the first laser communication link with the first low-earth satellite (10) or the third laser communication link with the second low-earth satellite (20) or the second laser communication link with the first synchronization satellite (20a),
the handheld terminal (40) sends out a beacon signal and establishes communication connection with other communication equipment with determined positions so as to establish a local area network, and the handheld terminal (40) serves as a relay station to establish communication connection with the other communication equipment through the first low-orbit satellite (10), the second low-orbit satellite (20) and/or the first synchronous satellite (20 a).
9. A method for optical communication between a satellite and a handheld terminal (40), characterized in that a capturing, tracking and aiming device on the handheld terminal (40) is capable of performing attitude transformation to capture a laser beam emitted by a first low-earth satellite (10), so that the handheld terminal (40) can establish a first laser communication link with the first low-earth satellite (10);
in case the hand-held terminal (40) establishes a first laser communication link with the first low earth orbit satellite (10), the first low earth orbit satellite (10) transfers first information of the hand-held terminal (40) to at least one geostationary satellite (20) having a determined position so that the hand-held terminal (40) can be covered by a laser beam emitted by the geostationary satellite (20),
and the first low earth orbit satellite (10) can transmit second information of a first synchronous satellite (20a) establishing a second laser communication link with the hand-held terminal (40) to the hand-held terminal (40) through the first laser communication link, so that the hand-held terminal (40) can select one of the first synchronous satellite (20a) establishing the second laser communication link with the hand-held terminal and adjust the attitude of the acquisition tracking sighting device based on the self-attribute,
the hand-held terminal (40) is thereby able to acquire the laser beam emitted by the geostationary satellite (20) to establish the second laser communication link at any time and place.
10. The method according to claim 9, wherein in case the first low-orbit satellite (10) cannot select at least one of the geostationary satellites (20) based on ephemeris data and the first information, the first low-orbit satellite (10) selects a second low-orbit satellite (30) based on ephemeris data and the first information as a satellite establishing a third laser communication link with the hand-held terminal (40) in case the first low-orbit satellite (10) cannot establish the first laser link with the hand-held terminal (40) such that the hand-held terminal (40) can establish a communication connection with a satellite at any time and any place;
wherein the first low earth satellite (10) establishes a communication connection with the second low earth satellite (30) to enable the second low earth satellite (30) to at least partially acquire the first information of the handheld terminal (40).
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CN1193854A (en) * 1996-11-27 1998-09-23 Trw公司 Multiple altitude satellite relay system and method
US6029935A (en) * 1998-01-22 2000-02-29 Trw Inc. Method for adding a geostationary component to a non-geostationary satellite network
CN101873181A (en) * 2010-06-13 2010-10-27 中国科学院上海光学精密机械研究所 Laser coherent data transmission channel simulation testing device
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