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Ground terminal pointing error calibration system and method for spatial chaotic laser communication system

A pointing error and chaotic laser technology, applied in the field of laser communication, can solve the problems of inaccurate alignment of the communication optical axis and affect the quality of communication, and achieve the effect of low cost and simple system structure

Inactive Publication Date: 2018-09-14
NANJING UNIV
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Problems solved by technology

During the transmission process, the communication link will be affected by the pointing error, which will lead to the inaccurate alignment of the communication optical axis, which will greatly affect the communication quality

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  • Ground terminal pointing error calibration system and method for spatial chaotic laser communication system
  • Ground terminal pointing error calibration system and method for spatial chaotic laser communication system

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The existing spatial chaos laser communication system has pointing errors due to channel conditions, system design and adjustment problems, which will lead to inaccurate alignment of the optical axis of the communication link and greatly affect the communication quality of the system. At present, in the calibration of the pointing error of the transmitter, due to the high cost of actual measurement of the system by the terminal on the launching star, most of the research on the pointing error is based on theoretical calculation and numerical simulation, or by building a ground free space of several kilometers. Simulated testing of space communication links. There are large errors in the above estimation methods. Therefore, it is of great significance for system design to measure the pointing error in the spatial chaos laser communica...

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Abstract

The invention discloses a ground terminal pointing error calibration system and method for a spatial chaotic laser communication system. The system comprises a ground laser emitting end, a collimatingand pre-targeting device, a photodetector, and an angular reflective mirror device disposed on the selected satellite, wherein the laser emitted from the ground laser transmitting end is transmittedto the selected satellite through the collimating and pre-targeting device; the angular reflective mirror device on the satellite reflects the laser reaching the satellite back to the ground; the reflected light returned to the ground is received by the photodetector and then transmitted to a data processing module; the data processing module calculates the pointing error and adjusts the parameterof the ground laser emitting end according to the pointing error, so as to realize calibration of the pointing error. The method and the system in the invention utilize an existing satellite terminalfor calibration of a ground transmitting base station, the system is simple in structure and low in cost, and is of great significance for testing and calibration of the ground base station.

Description

technical field [0001] The invention belongs to the field of laser communication, and in particular relates to a pointing error calibration system and method for a ground terminal of a space chaotic laser communication system. Background technique [0002] In recent years, space chaotic laser communication technology has developed rapidly. It is mainly composed of communication satellites and ground base stations. Communication satellites have communication functions and are usually placed in space tens of thousands of kilometers away from the ground to be used as ground launchers. The signal relay station can receive, amplify and retransmit the signal transmitted in the air. Generally speaking, communication satellites can be divided into two types for the earth, synchronous fixed-point communication satellites and relatively fixed stationary satellites; ground base stations are also called It is an earth station, and its main function is to transmit and receive satellite s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69H04B10/67H04B7/185H04L1/20
CPCH04B7/18517H04B10/671H04B10/6911H04L1/203H04L1/205
Inventor 李密陈媛王苏孙训
Owner NANJING UNIV
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