1. Development of Korean WADGPS
Changdon Kee
Seoul National University
7/24/2002

2. International Development of WADGPS
WAAS (USA)
EGNOS (Europe)
MSAS (Japan)
SNAS (China)
GAGAN (India)
GRAS (Australia)

3. Future WADGPS Coverage Regions

4. GPS Reference Stations in Korea
Total # of Station = 65
Astronomical Observatory
Institute of Geogragphy
Ministry of Home Affair
Ministry of Marine Affair
Institute of Geology

5. Korean NDGPS Reference Stations
# of Station = 8 + 3

6. Korean WADGPS (Option 1)
정지궤도 위성
GPS 위성 d $ R j b j
전리층 I d $ , R I j b
광역기준국
사용자
중앙처리국 `
광역기준국
지구국
광역기준국
광역기준국

7. Korean WADGPS (Option 2)b j
전리층 I
사용자
VHF
광역기준구
Wide Area Master Station
보정치
가상기준국
광역기준국
가상기준국
Wide Area
Ref. Station
Virtual Ref. Station
가상기준국
광역기준국

8. Korean WADGPS Driving Organization: Ministry of Marine Affairs
DGPS -> NDGPS -> WADGPS
Provide better Integrity, Continuity, Availability
Use the same Ref. Stations in NDGPS
Options to broadcast correction
1. GEO (WADGPS)
2. Loran-C (WADGPS)
3. Radio Beacon (DGPS, Virtual Ref Station)
Implementation: