Difference between revisions of "Complex signal"

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<div class="definition"><div class="short_definition">In [[radar]], a representation of the time-varying [[amplitude]] and [[phase]] of the received  [[signal]] as the real and imaginary parts of a time-varying complex number.</div><br/> <div class="paragraph">These parts are called the in-phase and [[quadrature]] components and are measured by [[coherent  detection]] of the received signal. The in-phase signal may be obtained by demodulating the received  signal with a local [[oscillator]] having the same phase and [[frequency]] as the transmitted signal, while  the quadrature signal may be obtained by demodulating the received signal with the local oscillator  signal advanced or retarded in phase by 90&deg;. <br/>''See'' [[I and Q channels]].</div><br/> </div>
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<div class="definition"><div class="short_definition">In [[radar]], a representation of the time-varying [[amplitude]] and [[phase]] of the received  [[signal]] as the real and imaginary parts of a time-varying complex number.</div><br/> <div class="paragraph">These parts are called the in-phase and [[quadrature]] components and are measured by [[coherent detection|coherent  detection]] of the received signal. The in-phase signal may be obtained by demodulating the received  signal with a local [[oscillator]] having the same phase and [[frequency]] as the transmitted signal, while  the quadrature signal may be obtained by demodulating the received signal with the local oscillator  signal advanced or retarded in phase by 90&#x000b0;. <br/>''See'' [[I and Q channels]].</div><br/> </div>
 
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Latest revision as of 16:40, 25 April 2012



complex signal

In radar, a representation of the time-varying amplitude and phase of the received signal as the real and imaginary parts of a time-varying complex number.

These parts are called the in-phase and quadrature components and are measured by coherent detection of the received signal. The in-phase signal may be obtained by demodulating the received signal with a local oscillator having the same phase and frequency as the transmitted signal, while the quadrature signal may be obtained by demodulating the received signal with the local oscillator signal advanced or retarded in phase by 90°.
See I and Q channels.