7. APPLICATION FUNCTIONS
7-1
7. APPLICATION FUNCTIONS
7.1 How to Cancel Error of Automatic Tracking Optical Axis
When measuring in Automatic Tracking mode, there is a possibility for angular error due to
misalignment of the telescope axis and auto tracking optical axis. Precaution is required for
accurate measurement under the sunny days in summer or very cold days in winter.
The errors of Auto Tracking Optical Axis can be canceled using the following procedure.
One Set of Inverted Observation
When the target prism is still, it is possible to cancel error of Auto Tracking Optical Axis by
calculating the measured data in each the face 1 (normal position) and face 2 (reversed position) of
the telescope.
The theory for canceling is the same as used for compensating for vertical axis error or horizontal
axis error. The calculations and procedures are similar.
Auto Tracking by normal position of telescope Auto Tracking by reversed position of telescope
[Calculation example]
Horizontal angle observation
Observation value of Target-1
Normal Telescope position
r
1 = 0 02' 25"
Reversed Telescope position
l
1 = 180 02' 15"
Observation value of Target-2
Normal Telescope position
r
2 = 51 17' 30"
Reversed Telescope position
l
2 = 231 17' 20"
The included angle of Target 1 and 2 is ;
r2 l2 r1 l1
2
= 51 15'05"
Vertical angle observation (Zenith 0)
Normal Telescope position
r
= 87 11' 20"
Reversed Telescope position
l
= 272 48' 50"
Vertical angle is ;
rl
2
180 = 87 11'15"
Sighting point
Horizontal angle error
Prism point
(measuring point)
Vertical angle error
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