Method for inverting atmosphere refractive index structure constant by measuring atmosphere coherent length result

Abstract

The invention discloses a method for inverting an atmosphere refractive index structure constant by measuring an atmosphere coherent length result. The method comprises the steps of designing a systemfor measuring atmosphere coherent length by a differential image motion method to detect fluctuation of an arrival angle caused by wavefront distortion; obtaining a plurality of single-frame short-exposure differential motion light spot images at an image surface of a receiving end by a measurement system; processing the acquired images by software to obtain jitter variance Sigma <2><t> and Sigma<2><t> of two arbitrary light spot mass centers in a horizontal direction and a vertical direction, and calculating atmosphere coherent length values r0 in different directions according to a formula;4, counting the atmosphere coherent length values r0 in different directions in the step 3 to solve an atmosphere coherent length measurement value averagely acquired at a current moment; and 5, reverting a value of the atmosphere refractive index structure constant C<2><n> according to a measurement value in the step 4. By the method, the turbulence strength change in an atmosphere channel can be measured and analyzed by calculating the atmosphere refractive index structure constant.

Description

technical field [0001] The invention belongs to the technical field of wireless laser communication, and relates to a method for reversing the atmospheric refractive index structural constant by using the result of measuring atmospheric coherence length. Background technique [0002] Wireless laser communication, also known as free space optical communication, is a two-way communication technology that realizes point-to-point, point-to-multipoint or multipoint-to-multipoint through laser in an atmospheric channel. Due to the characteristics of beam expansion, drift, light intensity fluctuation and coherence degradation caused by atmospheric turbulence, the laser will be affected when it is transmitted in the atmosphere, which will reduce the imaging quality of the system and restrict the performance of the wireless optical communication system. In severe cases, it will cause laser damage. Disruption of the transmission link. For long-distance transmission, the influence of ...

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Problems solved by technology

Due to the characteristics of beam expansion, drift, light intensity fluctuation and coherence degradation caused by atmospheric turbulence, the laser will be affected when it is transmitted in the atmosphere, which will reduce the imaging quality of the system and restrict the improvement of the performance of the wireless optical communication system. In severe cases, it will cause laser damage. Interruption of transmission link

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