Complex signal: Difference between revisions
From Glossary of Meteorology
imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == complex signal == </div> <div class="definition"><div class="short_definition">In radar...") |
imported>Perlwikibot No edit summary |
||
Line 9: | Line 9: | ||
</div> | </div> | ||
<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& | <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°. <br/>''See'' [[I and Q channels]].</div><br/> </div> | ||
</div> | </div> | ||
Revision as of 14:56, 20 February 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.
See I and Q channels.