Flare Detection Technology Of Space Laser Communication System Under Strong Background Light

The sky background radiation is the main background noise of the laser communication system. Especially to the acquisition link which has the big field of view and the long integration. And the rapid acquisition is the premise of establish the communication link. Therefore, analysis the parameters of sky background radiation,and then take proper measures to restrain the influence of sky background is very important to free space laser communications system.In this page, we analyzed the various parameters of the sky background radiation characteristics, combining with the working principle and performance characteristics of free space laser communication system.And the influence of sky background radiation to acquisition is the most important part. Focus facular is another important factor which can influence the acquisition performance. In this page, we talk about the characters of the facular, fitting out the curve when the facular is luminance distortion, and then judge the semidiameter of facular. Bases on the theory, we designed the test about the background radiation and facular characters. There are some conclusions from the test.According to the performance index of acquisition link, elect the wave length using for communication reasonably and use the optical system with small bore Jong focal length and small band width can reject the influence of the background radiation. Although doing like that.it can't get the perfect facula. atmospheric turbulence is another factor.Speckle can make the facula breaking. And it may appear the luminance distortion because of the operational coverage diagram. To this situation.we can determine the size of facula by Gauss fitting.