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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
circulation, 360° ~ 0°from when receiver begins phase values 
observation the moment in extent 0° ~ 360°. 
Of course, receiver must remove change of code modulation by 
180° satellite change to approach in received carrier wave. 
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Figure 1. CCD Camera Image acquisition 
2.2 Positioning that use GPS 
This method is settled by signal squaring method, and it is 
achieved taking advantage of precision knowledge about 
pseudo random number binary arrangement to make carrier 
wave of original. GPS reference network was consisted of about 
400 GPS control point been operating being established world 
wide current and about 1,400 GPS control point is planning for 
establishment and operation. GPS reference network is used by 
various kinds purpose such as navigation, Geo-spatial 
information system and practical use degree is expect to be 
magnified rapidly. Wide area reference network is planed to 
magnify by 125 forward although numbers of current control 
point are 75 when see worldwide. Increased to 360 hereafter 
although numbers of control point of reference network are 70 
in the United States America current, and capital of control 
point in country reference network from 250 now to 875, is 
increased. 
GPS is global positioning system that use artificial satellite. In 
receiving electric wave that shoot in satellite that find correct 
location observation point need there system that get location of 
observation point by observing be. Current use NAVSTAR 
GPS because U.S. AIRFORCE gets into leading after 1 is shot 
August, 1984, 26 total is operating and end part of the 20th 
century or satellite that aim early of the 21th century are 
planning and manufacture. GPS satellite is loading mathematic 
cesium clock, this cesium clock correct time whenever is 
transmitted in ground, Therefore, GPS satellite have system 
same time. Actually, GPS satellite has atomic-time dimension. 
A receiver watch includes watch error on problem explaining to 
do positioning because daytime than GPS has correctness 
degree. 
3. 
DEVELOPMENT SYSTEM AND COMPARING 
OBSERVED VALUE 
3.1 Precise Control Point Surveying used GPS 
In the area of the research, we computed GPS baseline by 
connecting permanent GPS site with the triangulation point for 
precise control point surveying used GPS. In consideration of 
distance from the triangulation point, permanent GPS site 
decided to use National Geographic Information Institute Daegu 
GPS active station, Jinju GPS active station and Ministry of 
At is observation value of arrival time, and if E does watch 
error, distance r can get by way(2.22)from satellite S, to 
receiver. 
r lp = (A' - E)c 
(2) 
c is speed of light way (2.22)E. Observation equation way 
(2.23) course same. 
«X p - У + (У, - Y, Ÿ + (Z, - Z, ) 2 } 11,2 = (M - E)c (3) 
At has observation possibility in way(2.23), and come four 
unknown quantity X P ,Y P ,Z P and E exists. Therefore, can get 
station of receiver and watch error that want if is observed in 
four satellite at least. Positioning method that use current GPS 
is used in positioning that is the airplane and positioning of ship 
and approximation that sail. Work takes advantage of 
continuous phase observation method what is called most land 
surveying work and mechanical work that use GPS, this method 
takes advantage of Heterodyning reception method that mix 
signal(wave) that is made when receive with carrier 
signal(wave) that receive essentially and get observation value 
that come by result specification time. Speak as "Continuous 
phase" that calculate phase change number from number of 
Kind of Machine 
C 3 
Sokkia GSR2600 
Specification 
RTK (1) 
1.0cm + lppm(Horizontal) 
2.0cm + lppm( Vertical) 
Static 
3mm + 0.5ppm(Horizontal) 
10mm + lppm( Vertical) 
DGPS 
WAAS/EGNOS : 0.8m CEP 
Channel 
12Channel L1/L2 Full code, Carrier 
Cold Start 
50sec 
Signal 
Reacquisition 
LI 0.5sec, L2 0.6sec 
Standard 
Input/Output 
Format 
RTCA, CMR, RTCM, NMEA 
lPPS(out), mak-in 
Figure 2. Base and Rover GPS specification 
3.2 Di 
Close-] 
Type 
Pic 
E\p 0 ;