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《Science of Surveying and Mapping》 2011-05
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Auto-focusing method based on distance function

HE Zhen-xin,LIU Chun-tong,ZHAO Xiao-feng,MA Jian(Second Artillery Engineering Institute,Xi'an 710025,China)  
Achievement of auto-focusing function in theodolite's telescope system is a primary condition in automatically measuring the angels of the targets.To meet the specific requirement such as small view field,severe environment and short response time,an auto-focusing method based on distance function was presented in the paper.According to the objective distance of target by use of well designed distance function the focusing distance could be calculated and subsequently transformed into locating signal,which drives the linear stepping motor to make the pancreatic lens move to the appropriate place.The analysis results showed that this method could meet the automatically measuring requirement of theodolite system with high precision,quick response and good adaptability to environment.
【CateGory Index】: TH761.1
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