Thomas Pany, IGS Workshop 2008

Survey of the “ipexSR” Software Receiver • High end, multi-frequency, real-time capable

• Tracks civil signals coming from all-in-view GPS / Galileo / SBAS satellites

• User code (C or MATLAB) can be used at all levels

• Input IF samples from - triple frequency (L1 or E1, L2, L5 or E5a)

USB Front-End (real-time processing)- recorded data files (post-processing)- single frequency L1 frontend

• Measurement accuracy levels - < 30 cm for code measurements- ~1 mm for carrier phase measurements

GNSS SDR Technology

Thomas Pany, IGS Workshop 2008

Double Difference Correlator Values

GNSS SDR Technology

•Provide complex prompt correlator values for post-processing

•Form double differences at correlator level

•Do carrier phase tracking at double difference level

•Expected improvement: 6-20 dB

tPTtitP trkcoh ̂exp

tPtPtPtPtP lm

km

ln

kn

RINEX carrier phase