Present and Future Global Navigation Satellite Systems (GNSS)
GEO2TECDI_GPS_2.pdf
GEO2TECDI_GPS_2.pdf
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Geodetic GPS Receivers<br />
• Requirements for a geodetic receiver:<br />
• must be able to measure integrated carrier phase data<br />
• must have data recording capability (typically RAM)<br />
• must have downloading capability (RS-232, USB, TCP/IP)<br />
• may be single-frequency (L1) or dual-frequency (L1&L2)<br />
• Dual-frequency receivers must be able to cope with A-S.<br />
• Measurements are usually stored/downloaded in a proprietary data format<br />
• Raw measurements can be converted into the Receiver Independent Exchange<br />
Format (RINEX)<br />
• by the receiver, or<br />
• using special converter software (manufacturer, TEQC, …)<br />
• Read/write data stream in RTCM-SC104 format (D-GPS/RTK) over serial port,<br />
build in radio-link, or via TCP/IP using the NTRIP protocol [optional for $$]<br />
16<br />
GEO2TECDI – Bangkok, May, 2009 – <strong>GNSS</strong> Lecture 2
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