A satellite wireless laser transmission system

Abstract

The application discloses a satellite wireless laser transmission system, belongs to the technical field of satellite wireless laser communication, and is applied to a wireless laser data transmission subsystem between spacecraft cabins, and is characterized in that: the system comprises a laser transmitter, a laser receiver, a laser transmitter controller, a laser receiver controller, a laser transmitter power supply, a laser receiver power supply, a laser transmitter antenna, a laser receiver antenna, a laser transmitter optical system, a laser receiver optical system, a laser transmitter optical system controller, a laser receiver optical system controller, a laser transmitter optical system power supply, a laser receiver optical system power supply, a laser transmitter optical system cooling system, a laser receiver optical system cooling system, a laser transmitter optical system cooling system controller, a laser receiver optical system cooling system controller, a laser transmitter optical system cooling system power supply, a laser receiver optical system cooling system power supply, a laser transmitter optical system cooling system cooling fan, a laser receiver optical system cooling system cooling fan, a laser transmitter optical system cooling system cooling fan controller, a laser receiver optical system cooling system cooling fan controller, a laser transmitter optical system

Description

Technical Field

[0001] This invention relates to a satellite wireless laser transmission system, belonging to the field of satellite wireless laser communication technology, and is applied to the inter-cabin wireless laser data transmission subsystem of spacecraft. Background Technology

[0002] The platform module of the optical satellite operates stably in orbit along three axes aligned with the Earth. The rotating module rotates around the platform module's flight direction plus the X-axis, at a speed of 2–16° / s. To transmit high-speed camera data from the rotating module to the platform module for subsequent data processing, short-range wireless communication is required. Furthermore, the payload module handles data volumes as high as 430Gbps, with a single-channel transmission rate of 10Gbps, necessitating the use of wireless laser technology for high-speed data transmission. Currently, both domestic and international satellites cannot achieve highly reliable and stable satellite data transmission under these operating conditions during in-orbit operation. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a satellite wireless laser transmission system that solves the problem of stable transmission of multiple optical signals between the rotating cabin and the platform cabin.

[0004] The technical solution of this invention is: a satellite wireless laser transmission system, comprising:

[0005] The laser array, located in the rotating cabin, is used to convert several electrical signals from the external signal source array into multiple optical signals and send them to the transmission control unit; the rotating cabin is used to carry the satellite's payload and is in a rotating state when in orbit.

[0006] The transmission control unit, located in the rotating cabin, receives control commands sent by the external payload integrated management unit, decodes and parses them to obtain the output combination information of multiple optical signals, and outputs the multiple optical signals to the wavelength division multiplexing unit according to the received output combination information of multiple optical signals; the payload integrated management unit is the central control computer of the payload equipment;

[0007] The wavelength division multiplexing unit, located in the rotating cabin, receives multiple optical signals sent by the transmission control unit, performs wavelength division multiplexing and beam combining, forms a composite beam and outputs it to the rotating cabin wireless transmission unit.

[0008] The rotating cabin wireless transmission unit, located in the rotating cabin, receives the composite beam sent by the wavelength division multiplexing unit and transmits it to the platform cabin wireless transmission unit.

[0009] The platform cabin wireless transmission unit, located in the platform cabin, receives the composite beam emitted by the rotating cabin wireless transmission unit and transmits it to the optical amplification unit; the platform cabin is used to carry the platform equipment of the satellite, and the platform equipment includes a telemetry and communication system, a central computer system, and a power supply system;

[0010] The optical amplification unit, located in the platform compartment, receives the composite beam sent by the wireless transmission unit of the platform compartment, amplifies the composite beam, forms an amplified composite beam, and outputs it to the dewavelength division multiplexing unit.

[0011] The dewavelength division multiplexing unit, located in the platform cabin, receives the amplified composite beam, performs beam splitting, obtains multiple amplified optical signals, and sends the multiple amplified optical signals to the detector group;

[0012] The detector array, located in the platform compartment, receives the multi-channel amplified optical signals sent by the demultiplexing unit, performs photoelectric conversion, obtains several detection data, and sends the detection data to the outside for the external system to complete the data reception and conditioning functions of electrical signals.

[0013] Furthermore, the satellite wireless laser transmission system employs a C-band multiplexed dense wavelength division multiplexing space laser communication mode for communication between its various units.

[0014] Furthermore, both the wavelength division multiplexing unit and the dewavelength division multiplexing unit include a temperature acquisition sensor, a heating circuit, and a liquid circuit. The temperature acquisition sensor acquires the device temperature in real time, and based on the acquired temperature value and a preset temperature threshold, it uses the heating circuit to raise the temperature or the liquid circuit to conduct heat to lower the temperature. Both the wavelength division multiplexing unit and the dewavelength division multiplexing unit use multilayer thin film coating to achieve passive temperature control.

[0015] Furthermore, the rotating cabin wireless transmission unit adopts a transmitting beam collimator, and the platform cabin wireless transmission unit adopts a receiving beam collimator, so as to realize data transmission between the rotating cabin and the platform cabin under rotating conditions.

[0016] Furthermore, the launch control unit receives control commands sent by the payload integrated management unit in real time, dynamically adjusts the combined state of multiple laser signals, and realizes data transmission switching of multiple combined states.

[0017] Furthermore, the optical amplification unit employs a multi-wavelength two-stage pump amplification method to compensate for the gain of the dynamically changing input composite beam, thereby achieving constant power composite beam output.

[0018] Furthermore, the laser array includes a temperature control unit, which collects the laser temperature in real time, compares it with the set temperature, and dynamically adjusts the temperature inside the laser array to achieve a constant temperature for the laser array.

[0019] Furthermore, the transmission control unit is equipped with a magneto-optical switch array, which is used to process and rotate the polarization state of the input optical signal to achieve switching of multiple optical signals.

[0020] Furthermore, the data transmission between the external signal source group and the laser group adopts the GTH interface.

[0021] Furthermore, the data transmission between the detector group and the outside world adopts the GTH interface.

[0022] The advantages of this invention compared to the prior art are:

[0023] (1) The interface module of the transmission control unit of the present invention receives control commands sent by the payload integrated management unit in real time, dynamically adjusts the combined state of multiple laser signals, and realizes seamless switching of data transmission of multiple combined states.

[0024] (2) The present invention adopts the C-band multi-channel dense wavelength division multiplexing space laser communication mode to realize multi-channel high-speed data transmission.

[0025] (3) The present invention uses a magneto-optical switch to process and rotate the polarization state of the input light to achieve optical path switching. No moving parts are used, which ensures the long-term stable and reliable operation of the system. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is a schematic diagram illustrating the principle of the present invention. Detailed Implementation

[0028] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0029] The following description, in conjunction with the accompanying drawings, provides a more detailed account of a satellite wireless laser transmission system according to embodiments of the present invention. Figure 1 Specific implementation methods may include:

[0030] The laser array, located in the rotating cabin, is used to convert several electrical signals from the external signal source array into multiple optical signals and send them to the transmission control unit; the rotating cabin is used to carry the satellite's payload and is in a rotating state when in orbit.

[0031] The transmission control unit, located in the rotating cabin, receives control commands sent by the external payload integrated management unit, decodes and parses them to obtain the output combination information of multiple optical signals, and outputs the multiple optical signals to the wavelength division multiplexing unit according to the received output combination information of multiple optical signals; the payload integrated management unit is the central control computer of the payload equipment;

[0032] The wavelength division multiplexing unit, located in the rotating cabin, receives multiple optical signals sent by the transmission control unit, performs wavelength division multiplexing and beam combining, forms a composite beam and outputs it to the rotating cabin wireless transmission unit.

[0033] The rotating cabin wireless transmission unit, located in the rotating cabin, receives the composite beam sent by the wavelength division multiplexing unit and transmits it to the platform cabin wireless transmission unit.

[0034] The platform cabin wireless transmission unit, located in the platform cabin, receives the composite beam emitted by the rotating cabin wireless transmission unit and transmits it to the optical amplification unit; the platform cabin is used to carry the platform equipment of the satellite, and the platform equipment includes a telemetry and communication system, a central computer system, and a power supply system;

[0035] The optical amplification unit, located in the platform compartment, receives the composite beam sent by the wireless transmission unit of the platform compartment, amplifies the composite beam, forms an amplified composite beam, and outputs it to the dewavelength division multiplexing unit.

[0036] The dewavelength division multiplexing unit, located in the platform cabin, receives the amplified composite beam, performs beam splitting, obtains multiple amplified optical signals, and sends the multiple amplified optical signals to the detector group;

[0037] The detector array, located in the platform compartment, receives the multi-channel amplified optical signals sent by the demultiplexing unit, performs photoelectric conversion, obtains several detection data, and sends the detection data to the outside for the external system to complete the data reception and conditioning functions of electrical signals.

[0038] In the solutions provided in the embodiments of the present invention, such as Figure 1 A satellite wireless laser transmission system is characterized by comprising a laser array, a transmit control unit, a wavelength division multiplexing (WDM) unit, a wireless transmission unit, a receive control unit, an optical amplification unit, a deWDM unit, and a detector array. All units of this satellite wireless laser transmission system employ a C-band multi-channel dense wavelength division multiplexing (DWDM) space laser communication mode to achieve high-speed multi-channel data transmission.

[0039] The laser array, located in the rotating cabin, performs electro-optical conversion of the N high-speed payload data source electrical signals output from the signal source group. The rotating cabin is a compartment of the satellite used to carry the satellite's payload and is in a long-term rotating state in orbit. The laser array consists of N laser modules, where N is not less than 45. Each laser module includes a laser modulator, a laser, a temperature control unit, and a power monitoring unit. The laser modulator receives the electrical signal input from the signal source group through the GTH interface, converts it into a modulation current, and simultaneously receives the power compensation deviation output from the power monitoring unit, dynamically adjusts the modulation current, and outputs the modulation current to the laser. The laser self-excites to generate a C-band laser signal; the N lasers self-excite to generate N laser signals with different C-band wavelengths, achieving C-band multiplexing with dense wavelength division multiplexing. The laser receives the drive current output from the laser modulator, converts the electrical signal and loads it onto the C-band laser signal to obtain a modulated laser signal, which is then coupled into an optical fiber and output to the transmission control unit. The temperature control unit employs active temperature control technology, collecting the laser temperature in real time, comparing it with the set temperature, and dynamically adjusting the temperature control unit within the laser to maintain a constant laser temperature and ensure the stability of the laser's center wavelength. The power monitoring unit monitors the laser temperature, calculates the deviation between the laser's output power and its nominal power, and sends the output power compensation amount to the laser modulator to achieve laser power compensation and maintain a constant optical power output.

[0040] The transmission control unit includes an interface module and a magneto-optical switch array. The interface module receives control commands from the payload integrated management unit, decodes and parses them to obtain the output combination information of multiple optical signals 1 to N, generates driving pulses, and then drives the magneto-optical switch array to achieve seamless switching of data transmission across multiple combinations. The magneto-optical switch array receives the driving pulses from the interface module, performs switching, and simultaneously receives multiple optical signals from the laser group, outputting these signals to the wavelength division multiplexing unit. The payload integrated management unit is the central control computer of the payload device. The magneto-optical switch array consists of N groups of magneto-optical switches. Each magneto-optical switch receives one laser signal and processes and rotates the polarization state of the input light by receiving the driving pulses from the interface module to achieve optical path switching. The N groups of magneto-optical signals output no less than M combinations of multiple optical signals, where M is not less than 2. For example, the signal source group outputs signal sources 1 to N in the first combination, and signal sources 1 to L in the second combination, where L is related to the number of signal sources in the signal source group; in this report, L is 20. The wavelength division multiplexing (WDM) unit receives multiple optical signals from the magneto-optical switch array of the transmit control unit, performs wavelength division multiplexing beam combining, and combines N laser signals into one composite beam, which is then output to the wireless transmission unit (rotating chamber). Furthermore, the WDM unit employs a combination of active and passive temperature control technology. It uses a temperature sensor to monitor the equipment temperature and, based on the acquired temperature value, employs a heating circuit for heating and a liquid circuit for cooling. Simultaneously, the WDM unit module uses multi-layer thin-film coating to achieve passive temperature control, reducing equipment temperature fluctuations and minimizing the center wavelength drift of the multiple optical signals and the composite beam.

[0041] The wireless transmission unit (rotating cabin) receives the synthesized light beam sent by the wavelength division multiplexing unit and wirelessly transmits it through the transmitting beam collimator. The transmitting beam collimator is an optical device that converts a parallel light beam into a diverging light beam.

[0042] The wireless transmission unit (platform cabin) receives the composite beam emitted by the wireless transmission unit (rotation cabin) and transmits it to the optical amplification unit via a beam collimator. The beam collimator is an optical device that converts a diverging beam into a parallel beam. Furthermore, the wireless transmission unit (platform cabin) is located within the platform cabin, which is a cabin of the satellite used to carry the satellite's platform equipment, typically including a telemetry and communication system, a central computer system, and a power supply system. The rotation joint system is a subsystem of the satellite used to support the satellite's rotation cabin's rotation relative to the platform cabin in orbit.

[0043] The optical amplification unit receives the synthesized beam transmitted by the wireless transmission unit (platform cabin), amplifies the synthesized beam, and outputs the amplified synthesized beam to the de-wavelength division multiplexing unit. The optical amplification unit adopts a multi-wavelength two-stage pump amplification method, and performs gain compensation for dynamically changing input synthesized beam power to achieve constant power synthesized beam output.

[0044] The demultiplexing unit receives the amplified and synthesized beam output from the optical amplification unit, performs beam splitting to obtain multiple amplified optical signals, and sends these signals to the detector array. Furthermore, the demultiplexing unit employs a combination of active and passive temperature control technology. It uses a temperature sensor to monitor the equipment temperature and, based on the acquired temperature values, employs a heating circuit for heating and a liquid circuit for cooling. Simultaneously, it utilizes multi-layer thin-film coating to achieve passive temperature control, reducing temperature fluctuations and minimizing the center wavelength drift of the multiple optical signals and the synthesized beam.

[0045] The detector array receives multiple amplified optical signals from the demultiplexing unit via the GTH interface, performs photoelectric conversion to obtain detection data 1 to N, and then sends the detection data to the data receiving FPGA. The data receiving FPGA is part of the data transmission system and is used to complete the data reception and conditioning functions of electrical signals.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0047] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A satellite wireless laser transmission system, characterized in that, include: The laser array, located in the rotating cabin, is used to convert several electrical signals from the external signal source array into multiple optical signals and send them to the transmission control unit. The rotating cabin is used to carry the satellite's payload and is in a rotating state while in orbit; The transmission control unit, located in the rotating cabin, receives control commands sent by the external payload integrated management unit, decodes and parses them to obtain the output combination information of multiple optical signals, and outputs the multiple optical signals to the wavelength division multiplexing unit according to the received output combination information of multiple optical signals; the payload integrated management unit is the central control computer of the payload equipment; The wavelength division multiplexing unit, located in the rotating cabin, receives multiple optical signals sent by the transmission control unit, performs wavelength division multiplexing and beam combining, forms a composite beam and outputs it to the rotating cabin wireless transmission unit. The rotating cabin wireless transmission unit, located in the rotating cabin, receives the composite beam sent by the wavelength division multiplexing unit and transmits it to the platform cabin wireless transmission unit. The platform cabin wireless transmission unit, located in the platform cabin, receives the composite beam emitted by the rotating cabin wireless transmission unit and transmits it to the optical amplification unit; the platform cabin is used to carry the platform equipment of the satellite, and the platform equipment includes a telemetry and communication system, a central computer system, and a power supply system; The optical amplification unit, located in the platform compartment, receives the composite beam sent by the wireless transmission unit of the platform compartment, amplifies the composite beam, forms an amplified composite beam, and outputs it to the dewavelength division multiplexing unit. The dewavelength division multiplexing unit, located in the platform cabin, receives the amplified composite beam, performs beam splitting, obtains multiple amplified optical signals, and sends the multiple amplified optical signals to the detector group; The detector array, located in the platform compartment, receives the multi-channel amplified optical signals sent by the demultiplexing unit, performs photoelectric conversion, obtains several detection data, and sends the detection data to the outside for the external system to complete the data reception and conditioning functions of electrical signals.

2. The satellite wireless laser transmission system according to claim 1, characterized in that: The satellite wireless laser transmission system uses a C-band multiplexed dense wavelength division multiplexing space laser communication mode for communication between its various units.

3. The satellite wireless laser transmission system according to claim 1, characterized in that: Both the wavelength division multiplexing unit and the dewavelength division multiplexing unit include a temperature acquisition sensor, a heating circuit, and a liquid circuit. The temperature acquisition sensor acquires the device temperature in real time. Based on the acquired temperature value and a preset temperature threshold, the heating circuit is used to raise the temperature or the liquid circuit is used to conduct heat to lower the temperature. Both the wavelength division multiplexing unit and the dewavelength division multiplexing unit use multilayer thin film coating to achieve passive temperature control.

4. The satellite wireless laser transmission system according to claim 1, characterized in that: The rotating cabin wireless transmission unit uses a transmitting beam collimator, and the platform cabin wireless transmission unit uses a receiving beam collimator, enabling data transmission between the rotating cabin and the platform cabin under rotating conditions.

5. A satellite wireless laser transmission system according to claim 1, characterized in that: The launch control unit receives control commands from the payload integrated management unit in real time, dynamically adjusts the combined state of multiple laser signals, and realizes data transmission switching of multiple combined states.

6. A satellite wireless laser transmission system according to claim 5, characterized in that: The optical amplification unit employs a multi-wavelength two-stage pump amplification method to compensate for the gain of the dynamically changing input composite beam, thereby achieving constant power composite beam output.

7. A satellite wireless laser transmission system according to claim 1, characterized in that, The laser array includes a temperature control unit, which collects the laser temperature in real time, compares it with the set temperature, and dynamically adjusts the temperature inside the laser array to achieve a constant temperature for the laser array.

8. A satellite wireless laser transmission system according to claim 1, characterized in that, The transmission control unit is equipped with a magneto-optical switch array, which is used to process and rotate the polarization state of the input optical signal to achieve switching of multiple optical signals.

9. A satellite wireless laser transmission system according to claim 1, characterized in that, Data transmission between the external signal source group and the laser group uses the GTH interface.

10. A satellite wireless laser transmission system according to claim 1, characterized in that, The detector group uses a GTH interface for data transmission with the outside world.

Images