An electromagnetic wave that can be modulated, as in frequency, amplitude, or phase, to transmit speech, music, images, or other signals.
(Electronics) a wave of fixed amplitude and frequency that is modulated in amplitude, frequency, or phase in order to carry a signal in radio transmission, etc. See amplitude modulation, frequency modulation
For an initially nearly monochromatic wave with a narrow spectrum the energy is concentrated at the carrier wave frequency, so that [[eta].sub.max] [approximately equal to] [absolute value of [a.sub.carrier]].
Various reference signals may be sinusoidal third-harmonic injection sinusoidaltriangular or trapezoidal waveforms whereas the carrier wave is normally a triangular waveform of frequency kept many folds larger than the reference signal frequency .
Interference of the direct satellite signal with amplitude [A.sub.d] and the reflected indirect signal with amplitude [A.sub.r] cause the change of signal strength S and multipath induced carrier wave phase shift Sep of the complete received signal (direct and indirect).