1

GNSS

1 2 3

1 263-8522 1-33E-mail:acca2156@chiba-u.jp

2 263-8522 1-33E-mail:wen.liu@chiba-u.jp

3 263-8522 1-33E-mail:fumio.yamazaki@faculty.chiba-u.jp

GNSS Global Navigation Satellite Systems

GNSSBluetooth WiFi

GNSSRNSS GNSS

Key Words : Global Navigation Satellite Systems, Elevation, Signal to Noise Ratio,Fixing Ratio

GPS GLONASSEU Galileo Compass

GNSS (Global Navigation Satellite Systems) RNSS (Radional Navigation Satellite Systems)

GNSS 2 kmSpace Segment

Control Segment

User Segment 31)

GNSS 4

2)

3, 4)

SNR Signal to Noise Ratio

22015 7 13

GPS

NovAtel GPS-702-GG NovAtelSTARBOX/OEM615 L1 L2 2

GPS GLONASS 2

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2

L1 L2 2 GPS

GPS 02:19:3702:50:11 11:19:21 11:49:55 30

11835

GPS GEONETNo.950225 1Hz

(35.65720507°)(140.04809914°) (43.744696349m)

5)

RTKLIB ver2.4.2 6)

5.8kmFix Continuous

Fix and Hold 2 ContinuousFix Fix and Hold

Fix

Fix and HoldFix and Hold

7)

(a)15 (b) 4

30

2L1 L2 8 SN

SN SNR L1 30,35,40dB3 L2 30,35dB 2 dBHz

2 SNR 5Continuous Fix and Hold 236

(a)

(b)

(c)

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3

FixFix

FixFix

FixFix 15°

30°

(a)

(b)

15 30

(a)

(b)

L1 L2 SN

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4

FixL1 SNR35dB 40dB

Fix 40dB 45dBFix

L2 SNRFix

L2 SNR

Continuous Fix and Hold

Fix 30° SNR L135dB SNR L2 35dB

(a)(NS, EW, UD)

Fix 0.9cm, 0.7cm 2.2cmFloat 1.2cm, 4.5cm, 43.5cm (b)

3 Fix0.5cm, 0.4cm, 1.2cm Float 3.1cm, 6.8cm,9.0cm Fix

4 6

FixFix

GNSSFix

SNRFix

GNSS

1) Official U.S. Government information about the Global Positioning System (GPS) and related topics,http://www.gps.gov/systems/gps/ (2015/11/26 )

2) GPS pp20,2002

3) GPS B Vol.J84-B No.12 pp.2082-2091 2001

4) : B

Vol.J84-B , No.12, pp.2123-2131, 2001.5) : ,

http://terras.gsi.go.jp/ (2015/12/09 )6) RTKLIB: Documents,

http://www.rtklib.com/rtklib_document.htm(2015/12/09 )

7) http://gpspp.sakura.ne.jp/index.shtml (2015/12/09 )

(a)

(b)

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