A star-to-earth quantum communication link direction tracking system
A technology of quantum communication and link direction, which is applied in radio wave measurement system, transmission system, image communication, etc., can solve the problems of limited capture and tracking system tracking and aiming suppression bandwidth, limited effect of suppression measures, large volume and weight, etc., to achieve Increased tracking and aiming suppression bandwidth, overcoming the large delay in image processing, and eliminating the effect of diffusion
Active Publication Date: 2012-02-01
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
The internal operation delay of each functional module plus the data transmission delay between modules causes a large total signal delay in the closed loop of the system, reaching 3ms or even longer, which limits the tracking and targeting suppression bandwidth of the capture and tracking system
[0005] 2. No measures have been taken to suppress the interference of atmospheric turbulence on the satellite-earth quantum communication link, or the suppression measures taken have very limited effects, even under good atmospheric conditions, the optimal detection accuracy is about 1-2 μrad
[0006] 3. The composition of the system is complex, the volume and weight are large, and it is not suitable as a spaceborne quantum communication device
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[0021] combine figure 1 system structure and figure 2 A set of typical test data is taken as an example to illustrate the design and implementation method of the system and the specific functions of each sub-module. The example system selects the CYIL1SM0300AA CMOS image sensor as the quantum communication beacon detector, selects the EP2C20F256 FPGA as the overall control of the system, and adopts the DA26LV31CM and DA26LV31CM422 differential interface chips to realize the bidirectional interface of sending and receiving as the data transmission and command control interface, and adopts the AD5399 dual One high-speed DAC outputs tracking control analog signals in X and Y directions.
[0022] 1. The logic drive module provides multiple drive signals required by the CMOS image sensor to complete the drive function of the sensor, so that the sensor can work normally and output image data.
[0023] 2. The specific fixed pattern (FPN) noise data of the CMOS image sensor is pre-...
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The invention discloses a satellite-to-ground quantum communication link direction tracking system. Aiming at the application background of high-precision beacon tracking for satellite-to-ground quantum communication, it provides a real-time high-precision system based on CMOS or CCD detectors and FPGA hardware image processing and information extraction. The precision high-bandwidth beacon detection and information acquisition system adopts an integrated design method; and proposes a beacon spot image processing method that combines spot shaping and position extraction, which to a certain extent suppresses the impact of the atmospheric turbulence channel between the satellite and the ground on the beacon. The interference effect of light improves the tracking accuracy, bandwidth and stability of the capture and tracking system. In the presence of atmospheric turbulence, the system's detection accuracy of beacon lasers is better than 0.5μrad, and the detection bandwidth is greater than 2.5kHz, which meets the needs of satellite-to-ground quantum communication capture and tracking systems, especially spaceborne terminals.
Description
technical field [0001] The invention belongs to the technical field of quantum communication, and specifically refers to a system for extracting and tracking the direction of a communication link, which is applied in satellite-to-earth quantum communication. Background technique [0002] Quantum communication has higher pointing accuracy requirements for communication links than conventional free-space laser communication. The Acquisition, Tracking and Targeting (ATP) system of satellite-to-earth quantum communication is used to establish a quantum communication link between quantum communication terminals, and must have very high tracking and targeting accuracy, bandwidth and stability. The communication link direction extraction and tracking sub-module of the capture tracking system must have higher performance. [0003] Currently known communication link direction extraction and tracking systems that use CCD or CMOS image sensors as detectors for inter-satellite quantum ...
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IPC IPC(8): H04N5/349H04B10/30G01S17/00H04N25/48H04B10/90
Inventor 王建宇林均仰舒嵘贾建军
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI