May 5, 2003--Thales has launched a new generation of decimetric Differential GPS (DGPS) positioning systems, offering the oil, gas and hydrographic in ...

The U.S. Coast Guard transmits differential corrections to GPS signals (DGPS) via low-frequency (285- to 325-kHz) beacons. Transmission data rates are 100 or 200 bits/s. The modulation ...