Primary Environment Influence Factors to Tracking Precision in Space-ground Laser Communication
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.
This paper begins noting the increasing importance of environmental issues, their relationship with the economic system, and the key role of firms in obtaining sustainable development. The study then proceeds to examine at a functional level on one of a company's core subsystems: Operations Management. The analysis then indicates the extent to which environmental matters ought to be considered in the setting of Operations objectives, strategy design, and performance measurement. The paper briefly reviews the concept of competitive priorities in Operations putting forward and justifying the environment as a new competitive priorities in the area. Finally it goes on highlight the role environment is- sues can play in the achieving of a firm's competitive advantage