Gnss, Gps, Gps Tracking System, Signal Processing.
are Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK). In ASK, the amplitude of the signals is modulated to represent the signal levels (0 and 1), while frequency and phase remain untouched. Similarly, FSK modulates data signal on the carrier wave’s frequency,