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1 NOMENCLATURE AND FUNCTIONS
1-5
1
雙軸補償
Inclination of the vertical axis with respect to true vertical will result in incorrectly
measured horizontal angles. The extent of the error in horizontal angle measurement due
to axis tilt depends on three factors :
z
the amount of the tilt of axis
z
the elevation of the target
z
the horizontal angle between the direction of till of the vertical axis and the
target.
These factors are related by the following formula :
Hzerr
= V sin tanh
where v = tilt of axis in arcseconds
α
= azimuth angle between vert. axis direction and target
h = elevation of target
Hzerr
= error in horizontal angle
Example: When the vertical axis is tilted by 30 arcseconds, the target is 10
°
above the
horizon and rotated 90
°
in azimuth from the direction of the vertical axis error.
Hzerr = 30"
y
sin
α
y
tan10
°
Hzerr = 30"
y
1
y
0.176326=5.29"
From the above example it can be seen that horizontal angle errors will increase with
steeper vertical sights (tangent will increase as vertical angle increases) and will be at a
maximum when the target is at right angles (sin 90
°
=1) to the direction of the vertical axis
error. Errors will be at a minimum when the sights are nearly horizontal (h=0, tan0=0) and
in the same direction as the vertical axis error (
α
=0, sin0=0). Please refer to the table
below to see the relationship between axis tilt (v) and elevation (h) and the error in
horizontal angles which results from these factors.
hv
0
°
1
°
5
°
10
°
30
°
45
°
0"
0" 0" 0" 0"
0" 0"
0"
0" 0.09"
0.44"
0.88"
2.89" 5"
10"
0" 0.17" 0.87" 1.76" 5.77" 10"
15"
0" 0.26" 1.31" 2.64" 8.66" 15"
30" 0" 0.52"
2.62"
5.29"
17.32"
30"
1' 0"
1.05"
5.25"
10.58"
34.64"
1'
Содержание GTS-710 Series
Страница 1: ...GTS 710 GTS 710 GTS 711 GTS 712 GTS 713...
Страница 9: ...1 NOMENCLATURE AND FUNCTIONS 1 9 1 1 1 BT 30Q Lower horizontal clamp Point guide type only 4A...
Страница 17: ...10 SETTING ATMOSPHERIC CORRECTION 10 9 2 2 1 BT 30Q z BT 3Q PC 5 z BT 3L PC 6 PC 6 PC 5 BT 3L PC 6 BT 3Q PC 5...
Страница 35: ...10 SETTING ATMOSPHERIC CORRECTION 10 27 N E PSM 0 0 Z PPM 12 3 m F R SA HT MEAN ft SET 1 F1 EXIT...
Страница 76: ...11 CORRECTION FOR REFRACTION AND EARTH CURVATURE 11 68 Temprerature C Temprerature F...
Страница 77: ...11 CORRECTION FOR REFRACTION AND EARTH CURVATURE 11 69 Temprerature F...
Страница 88: ...11 CORRECTION FOR REFRACTION AND EARTH CURVATURE CONTENTS 10 17 1 2 3 70 o C 4 5 6 7 8 9 10 11 12 13...