Undersøgelse af RTK teknikker - Danmarks Tekniske Universitet

Indholdsfortegnelse vii
Indholdsfortegnelse
1. Teori 1
1.1. Global Positioning System - GPS...............................................................................1
1.1.1. Enkelt-differencer...............................................................................................3
1.1.2. Dobbelt-differencer ............................................................................................5
1.1.3. Forskelle i differentielle fase-opmålingsteknikker.............................................6
1.2. Real Time Kinematisk GPS........................................................................................6
1.2.1. Enkeltstations RTK ............................................................................................7
1.2.2. Netværks RTK....................................................................................................8
1.3. GNSS Netværkskorrektionsteknik .............................................................................9
1.3.1. Flächen Korrektur Parameter – FKP ..................................................................9
1.3.2. Virtuel Reference Station – VRS .....................................................................13
1.4. Datalink - RTK .........................................................................................................16
1.4.1. Radio.................................................................................................................17
1.4.2. GSM modem ....................................................................................................19
1.4.3. IP/Internet .........................................................................................................20
1.4.4. Dataformat til RTK...........................................................................................21
2. Testopstilling ....................................................................................................................22
2.1. Definition af testparametre .......................................................................................22
2.2. GPS-referencen.........................................................................................................23
2.2.1. GPS-referencens netværksdel...........................................................................24
2.2.2. Opstilling af test procedurer for test af GPS-referencen ..................................24
2.2.3. Valg af kontrolpunkter til test af GPS-referencen............................................26
2.2.4. Fejl i udvælgelsen af testpunkter......................................................................28
2.3. GPSNet .....................................................................................................................30
2.3.1. Opstilling af test procedurer for test af GPS-referencen ..................................32
2.3.2. Bestemmelse af koordinater til VRS testpunkter .............................................34
2.3.3. Problemer med KMS’s permanente referencestation i Buddinge ....................36
3. Udstyr 39
3.1. Leica – GX1200 .......................................................................................................39
3.2. Trimble R8................................................................................................................41
4. Analyse af testresultater ...................................................................................................43