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The influences of main parts of an apparatus and channel to power of communication laser on space-ground optical communication slant link were analyzed.Based on the formula for signal-to-noise ratio of receiving detector and bit error rate of communication,the simulation system of space-ground optical communication was established.Using the simulation system,the highest communication rates as to the different atmospheric visibilities were analyzed,the assumptions that bit error rate is superior to 10-7,the minimum transmitter power and the maximum communication distance were discussed in order to achieve the communication rate to 1.5 GHz and bit error rate is superior to 10-7.The result indicates that influence of the atmospheric visibility to the bit error rate is more obvious,when the transmitter power is greater.

In order to analyze influence of the external factors to the tracking precision of space-ground optical communication,the platform vibration,atmospheric turbulence,and background light are studied, and can be attributed to the influence of tracking precision.Tracking simulation system is founded on the basis of measured platform vibration data.The compositive influence of various factors to tracking precision is analyzed under different conditions.Based on the assumptions,coarse tracking can well suppress the vibration of mobile platform on ground and ensure that laser beam can enter fine tracking field;the middle atmospheric turbulence increases the standard deviation of fine tracking error to about four times;if low altitude area is selected as examination spot,atmospheric turbulence will increase standard deviation of fine tracking error to about two times.