GPS satellite-synchronised chronometer with local time display - uses XTAL-controlled clock and interpolation signal processor

摘要

The radio synchronised clock contains an antenna (10) and radio receiver (20) consisting of pre-amp (22), IF section (24) and a crystal oscillator (26). The oscillator maintains local time with error delta tB (28). GPS satellites (12,14,16,18) transmit synchronising signals and time codes. By determining the relative timing of these signals, local time and position are generated by processor (30). An error estimate for delta tB is output (32) to a time generator (34). Longitude (36) is output to time-zone store (38) which outputs the difference between the Local Mean Time and GMT to the time generator. By these means a chronometer is realised which automatically indicates local time worldwide and with satellite time synchronisation. USE - Ship navigation and chronometer.