Atmospheric turbulence mismatch compensation method in space chaotic laser secret communication system

Abstract

The invention discloses a high-precision atmospheric turbulence mismatch compensation method in a spatial chaotic laser secret communication system, and aims to solve the problems that a downlink of aconventional spatial chaotic laser communication system is influenced by a light intensity flicker effect caused by atmospheric turbulence, so that signals of a receiving end and a transmitting end are mismatched, the signal quality becomes poor, and serious error codes are caused. In order to compensate for mismatch caused by a light intensity flicker effect, improve the atmospheric interferenceresistance of a communication system and reduce the bit error rate of the system, the invention provides a method for performing mismatch compensation by taking a laser signal emitted by an existingoptical tracking and pointing subsystem in the system as a reference. According to the method, an on-board terminal does not need to be additionally launched, the number of devices needed for achieving compensation is small, the requirement for satellite miniaturization can be met, and the cost is relatively low.

Description

technical field [0001] The invention relates to the field of laser communication, in particular to a compensation method for atmospheric turbulence mismatch in a space chaotic laser security communication system. Background technique [0002] Chaos laser has basic characteristics such as initial value sensitivity, high complexity, and no periodicity, which can well realize high-secret information transmission. Applying it to satellite laser communication can realize high-capacity secure communication, making space chaotic Laser communication technology has attractive application prospects, and it has become an important direction in the field of satellite communication for the characteristics and realization of the system. [0003] In the downlink of the space chaos laser communication system, the signal is sent by the transmitter on the star, transmitted in the atmospheric channel, and the terminal installed on the ground receives the optical signal and demodulates the tran...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the above problems, the present invention provides a high-precision atmospheric turbulence mismatch compensation method in a space chaotic laser security communication system. The existing space chaotic laser communication system will be affected by the atmospheric effect during operation, and the atmospheric effect causes the laser beam to Scattering and absorption, jitter occurs during transmission and received spot energy varies randomly

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