A 600 million km space interstellar laser communication system

Abstract

The present application relates to the technical field of laser communication, in particular to a 600 million kilometers space interstellar laser communication system, four laser beams are emitted through a laser emitting device, the laser emitted by the laser emitting device is received through a laser receiving device, and the received laser is converted into a digital image, the image is processed and displayed through a display device, thereby overcoming the interference of atmospheric turbulence on the laser channel, realizing scanning of the laser beam on a specified area and finding a target, establishing an effective laser communication channel with the target after stable tracking, improving the communication quality of the laser communication system, thereby solving the technical problem that the single-beam communication adopted by the existing laser communication system causes the far-end laser spot to be dispersed, the energy is not concentrated, the action distance is seriously weakened, the communication quality is reduced, and the communication error rate is increased.

Description

Technical Field

[0001] This invention relates to the field of laser communication technology, and in particular to a six-million-kilometer interplanetary laser communication system. Background Technology

[0002] Laser communication is a communication method that uses lasers to transmit information. Lasers are a new type of light source with characteristics such as high brightness, strong directionality, good monochromaticity, and strong coherence. According to the different transmission media, it can be divided into atmospheric laser communication and fiber optic communication. Atmospheric laser communication uses the atmosphere as the transmission medium, while fiber optic communication uses optical fibers to transmit optical signals.

[0003] As humanity's exploration of space deepens, spacecraft are needed to conquer space. With the continuous development of aerospace technology, spacecraft technology has made great breakthroughs. Currently, when spacecraft are flying in space, they need to use interstellar laser communication systems to maintain contact with the ground in order to avoid losing contact during spaceflight.

[0004] Existing interplanetary laser communication systems use single-beam communication, where laser energy and beam quality determine the communication distance. At the same time, the main factor affecting the laser communication distance is atmospheric turbulence, which causes the laser spot at the far end to be dispersed and the energy to be unconcentrated, which seriously weakens the effective range, reduces the communication quality, and leads to an increase in the communication error rate. Summary of the Invention

[0005] The purpose of this invention is to provide a six-million-kilometer interplanetary laser communication system, which solves the technical problems of existing interplanetary laser communication systems, which use single-beam communication. The communication distance is determined by the laser energy and beam quality. At the same time, the main factor affecting the laser communication distance is atmospheric turbulence, which causes the laser spot at the far end to be dispersed and the energy to be unconcentrated, which seriously weakens the working distance, reduces the communication quality, and increases the communication error rate.

[0006] To achieve the above objectives, the present invention provides a six-million-kilometer interplanetary laser communication system, comprising a control device, a laser emitting device, a laser receiving device, and a display device. The control device is used to control the laser emitting device, the laser receiving device, or the display device. The laser emitting device is used to emit a communication laser beam, split the communication laser beam to obtain a communication optical beam, and then emit the communication optical beam. The laser receiving device is used to receive the emitted communication optical beam, and after filtering, amplifying, and demodulating, convert the obtained signal into a digital image. The display device is used to perform image processing on the digital image and display the processed image.

[0007] The control device includes a control panel and a controller. The control panel is used to transmit control commands to the controller. The controller is used to receive the control commands from the control panel and control the laser emitting device, the laser receiving device, or the display device through the control commands.

[0008] The laser emitting device includes a telescope, a laser, an optical modulator, and a laser beam splitter. The telescope is used to emit four communication laser beams. The laser is used to transmit the communication laser beams to the optical modulator connected to the laser. The optical modulator is used to modulate the communication laser beams. The laser beam splitter is used to divide each communication laser beam into four parallel beams to obtain a communication optical beam.

[0009] The laser emitting device also includes an optical transmitting antenna, which is used to transmit communication optical beams.

[0010] The laser receiving device includes an optical receiving antenna, a photodetector, and an optical filter. The optical receiving antenna is used to receive the emitted communication light beam and send it to the photodetector. The photodetector is used to convert the laser signal of the communication light beam into an electrical signal. The optical filter is used to filter, amplify, and demodulate the converted electrical signal in the photodetector, so that the electrical signal is converted back into the original signal.

[0011] The laser receiving device further includes an imager, which receives the signal from the optical filter and forms a digital image from the signal.

[0012] The display device includes an image processor and a display screen. The image processor is used to process the digital image formed by the imager and transmit the processed image to the display screen. The display screen is used to display the image processed by the image processor.

[0013] This invention discloses a six-million-kilometer interplanetary laser communication system. The system emits four laser beams via a laser emitting device, receives the emitted laser beams via a laser receiving device, converts the received laser beams into digital images, and processes and displays the images via a display device. This overcomes the interference of atmospheric turbulence on the laser channel, enabling the laser beams to scan a designated area, detect targets, and establish an effective laser communication channel after stable target tracking. This improves the communication quality of the laser communication system and solves the technical problem of existing single-beam communication systems, which leads to dispersed laser spots at distant points, unconcentrated energy, severely reduced operating distance, decreased communication quality, and increased communication error rates. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a control principle diagram of the six-million-kilometer interplanetary laser communication system according to the first embodiment of the present invention.

[0016] In the diagram: 101-Control device, 102-Laser emitting device, 103-Laser receiving device, 104-Display device, 105-Control panel, 106-Controller, 107-Telescope, 108-Laser, 109-Optical modulator, 110-Laser beam splitter, 111-Optical transmitting antenna, 112-Optical receiving antenna, 113-Photodetector, 114-Optical filter, 115-Imager, 116-Image processor, 117-Display screen. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] First embodiment: Please see Figure 1 ,in Figure 1 This is a control principle diagram of a six-million-kilometer interplanetary laser communication system according to the first embodiment of the present invention. The present invention provides a six-million-kilometer interplanetary laser communication system, including a control device 101, a laser emitting device 102, a laser receiving device 103, and a display device 104. The control device 101 includes a control panel 105 and a controller 106. The laser emitting device 102 includes a telescope 107, a laser 108, an optical modulator 109, a laser beam splitter 110, and an optical transmitting antenna 111. The laser receiving device 103 includes an optical receiving antenna 112, a photodetector 113, an optical filter 114, and an imager 115. The display device 104 includes an image processor 116 and a display screen 117.

[0020] In this embodiment, the present invention emits four laser beams through the laser emitting device 102, receives the laser beams emitted by the laser emitting device 102 through the laser receiving device 103, converts the received laser beams into digital images, and processes and displays the images through the display device 104. This overcomes the interference of atmospheric turbulence on the laser channel, enables the laser beams to scan a designated area and detect targets, and establishes an effective laser communication channel with the target after stable tracking. This improves the communication quality of the laser communication system and solves the technical problem that the single-beam communication used in existing laser communication systems causes the far-end laser spot to be dispersed, the energy to be unconcentrated, which seriously weakens the working distance, reduces the communication quality, and leads to an increased communication error rate.

[0021] The control device 101 is used to control the laser emitting device 102, the laser receiving device 103, or the display device 104. The laser emitting device 102 is used to emit a communication laser beam, split the communication laser beam to obtain a communication optical beam, and then emit the communication optical beam. The laser receiving device 103 is used to receive the emitted communication optical beam, and after filtering, amplifying, and demodulating, convert the obtained signal into a digital image. The display device 104 is used to perform image processing on the digital image and display the processed image.

[0022] Secondly, the control panel 105 is used to transmit control commands to the controller 106; the controller 106 is used to receive the control commands from the control panel 105, and to control the laser emitting device 102, the laser receiving device 103, or the display device 104 through the control commands. By operating the relevant buttons on the control panel 105, the control panel 105 can transmit control commands to the controller 106, thereby enabling the controller 106 to control the operation of the laser emitting device 102, the laser receiving device 103, or the display device 104.

[0023] Furthermore, the telescope 107 is used to emit four communication laser beams; the laser 108 is used to transmit the communication laser beams to the optical modulator 109 connected to the laser 108; the optical modulator 109 is used to modulate the communication laser beams; the laser beam splitter 110 is used to split each communication laser beam into four parallel beams to obtain a communication optical beam; the optical transmitting antenna 111 is used to emit the communication optical beam. The telescope 107 at a position of 15m on the optical earth station will emit four communication laser beams. By having the telescope 107 emit communication laser beams, signal fluctuations caused by turbulent atmosphere can be reduced.

[0024] Meanwhile, the laser 108 is a multimode fiber laser 108 with a center diameter of 0.1 nm. The laser 108 is a deep-space laser diode. Each laser beam emitted by the telescope 107 is transmitted to the optical modulator 109 by the multimode fiber laser 108 with a center diameter of 0.1 nm. After modulation in the optical modulator 109, each communication laser beam is split into four parallel beams by the laser beam splitter 110 to obtain a communication optical beam. The wavelength of the communication optical beam is 815 m, the beam divergence angle is 204 degrees, and the wavefront error is 0.1, thereby enabling it to cover the aiming of LUCE.

[0025] In addition, the optical receiving antenna 112 is used to receive the transmitted communication light beam and send it to the photodetector 113; the photodetector 113 is used to convert the laser signal of the communication light beam into an electrical signal; the optical filter 114 is used to filter, amplify and demodulate the converted electrical signal in the photodetector 113, so that the electrical signal is converted back into the original signal; the imager 115 is used to receive the signal of the optical filter 114 and form a digital image from the signal; the photodetector 113 is an avalanche diode (APD); in the error fluctuation range test, adaptive forward error correction coding is used to improve the downlink communication quality, thereby confirming the high-speed laser communication between the low Earth orbit satellite and the ground; after adopting the composite optical beam transmission system, the fluctuation was improved by 10dB; in clear weather, the inter-satellite link test was relatively successful, and the minimum bit error rate could reach 5-10; the modulation and reception technology adopts the direct intensity modulation and direct intensity detection (M / DD) method, which can directly convert the transmitted laser into an electrical signal through the OOK data stream.

[0026] Finally, the image processor 116 performs image processing on the digital image formed by the imager 115 and transmits the processed image to the display screen 117; the display screen 117 displays the image processed by the image processor 116.

[0027] When using the six-million-kilometer interplanetary laser communication system of this embodiment, by operating the relevant buttons on the control panel 105, the control panel 105 can transmit control commands to the controller 106, thereby enabling the controller 106 to control the operation of the laser emitting device 102, the laser receiving device 103, or the display device 104. After the laser emitting device 102, the laser receiving device 103, or the display device 104 is operating, the telescope 107 emits four communication laser beams. These communication laser beams are then transmitted through the laser 108 to the optical modulator 109 connected to the laser 108. After being modulated in the optical modulator 109, each communication laser beam is split into four parallel beams using the laser beam splitter 110. The laser beam is transmitted to the optical transmitting antenna 111 and then emitted. After the laser is emitted, the optical receiving antenna 112 receives the emitted laser beam and sends it to the photodetector 113. The photodetector 113 converts the laser signal of the laser beam into an electrical signal. The optical filter 114 filters, amplifies, and demodulates the converted electrical signal, converting it back into the original signal. The imager 115 then receives the signal from the optical filter 114 and forms a digital image. The digital image is then transmitted to the image processor 116 for image processing. Finally, the processed image is transmitted to the display screen 117 for display, thereby realizing interplanetary laser communication between the spacecraft and the optical earth station on the ground.

[0028] In summary, this invention emits four laser beams through the laser emitting device 102, receives the laser beams emitted by the laser emitting device 102 through the laser receiving device 103, converts the received laser beams into digital images, and processes and displays the images through the display device 104. This overcomes the interference of atmospheric turbulence on the laser channel, enables the laser beams to scan a designated area and detect targets, and establishes an effective laser communication channel with the target after stable tracking. This improves the communication quality of the laser communication system and solves the technical problem that the single-beam communication used in existing laser communication systems leads to the dispersion of the laser spot at the far end, the lack of energy concentration, a serious reduction in the effective range, a decrease in communication quality, and an increase in the communication error rate.

[0029] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A six-million-kilometer interplanetary laser communication system, characterized in that, The system includes a control device, a laser emitting device, a laser receiving device, and a display device. The control device controls the laser emitting device, the laser receiving device, or the display device. The laser emitting device emits a communication laser beam, splits the communication laser beam to obtain a communication optical beam, and then emits the communication optical beam. The laser receiving device receives the emitted communication optical beam, and after filtering, amplifying, and demodulating, converts the obtained signal into a digital image. The display device performs image processing on the digital image and displays the processed image.

2. The six-million-kilometer interplanetary laser communication system as described in claim 1, characterized in that, The control device includes a control panel and a controller. The control panel is used to transmit control commands to the controller. The controller is used to receive the control commands from the control panel and control the laser emitting device, the laser receiving device, or the display device through the control commands.

3. The six-million-kilometer interplanetary laser communication system as described in claim 1, characterized in that, The laser emitting device includes a telescope, a laser, an optical modulator, and a laser beam splitter. The telescope is used to emit four communication laser beams. The laser is used to transmit the communication laser beams to the optical modulator connected to the laser. The optical modulator is used to modulate the communication laser beams. The laser beam splitter is used to divide each communication laser beam into four parallel beams to obtain a communication optical beam.

4. The six-million-kilometer interplanetary laser communication system as described in claim 3, characterized in that, The laser emitting device also includes an optical transmitting antenna, which is used to transmit communication optical beams.

5. The six-million-kilometer interplanetary laser communication system as described in claim 1, characterized in that, The laser receiving device includes an optical receiving antenna, a photodetector, and an optical filter. The optical receiving antenna is used to receive the emitted communication light beam and send it to the photodetector. The photodetector is used to convert the laser signal of the communication light beam into an electrical signal. The optical filter is used to filter, amplify, and demodulate the converted electrical signal in the photodetector, so that the electrical signal is converted back into the original signal.

6. The six-million-kilometer interplanetary laser communication system as described in claim 5, characterized in that, The laser receiving device further includes an imager, which receives the signal from the optical filter and forms the signal into a digital image.

7. The six-million-kilometer interplanetary laser communication system as described in claim 6, characterized in that, The display device includes an image processor and a display screen. The image processor is used to perform image processing on the digital image formed by the imager and transmit the processed image to the display screen; the display screen is used to display the image processed by the image processor.

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