How to get received signal at the carrier when use Phased Array ToolBox

조회 수: 2 (최근 30일)
Chen
Chen 2020년 1월 13일
댓글: Honglei Chen 2020년 1월 14일
Hello
Following code is copied from help of phased.Collector, My questions are
  1. what is 'receivedsig' signal frequency?
  2. How to get signal at carrier freqeuncy fc, i.e. the array each element received signal at carrier?
Thanks
Chen
-----------------------------------------------------------------------
fc = 1e9;
lambda = physconst('LightSpeed')/fc;
array = phased.ULA('NumElements',4,'ElementSpacing',lambda/2);
t = linspace(0,1,1e3);
x = cos(2*pi*200*t)';
collector = phased.Collector('Sensor',array, ...
'PropagationSpeed',physconst('LightSpeed'),'Wavefront','Plane', ...
'OperatingFrequency',fc);
incidentangle = [45;10];
receivedsig = collector(x,incidentangle);

채택된 답변

Chen
Chen 2020년 1월 14일
Hello HTH
Many thanks for you answer!
In order to do A(t)exp(1i*2*pi*fc*t). A(t) has to sampled at fs>=2fc. Please let me know which of followings are right, or both OK.
  1. make x is (in my code above) sampled at fs=2.1*Fc, and send to collector to get 'receivedsig', and then do receivedsig.*exp(1i*2*pi*fc*t) to get carrier data.
  2. keep x is the same in the above code. get 'receivedsig' first at low-rate. then do interplation to add points in 'receivedsig' based on ts=1/(2.1*fc), after that, do receivedsig.*exp(1i*2*pi*fc*t)
Regards!
Che

추가 답변 (1개)

Honglei Chen
Honglei Chen 2020년 1월 14일
Phased Array System Toolbox models the signal as a complex baseband representation. Normally a signal occupies certain bandwidth around a carrier in the form of A(t)exp(1i*2*pi*fc*t). So the toolbox just models A(t) as if the signal were downconvereted from the carrier.
If you want to get the origianl signal, you can just do A(t)exp(1i*2*pi*fc*t). However, make sure you really need it because to accurately represent a signal at fc, you need to at lease sample at 2*fc, which could be very high.
HTH

카테고리

Help CenterFile Exchange에서 Pulsed Waveforms에 대해 자세히 알아보기

제품


릴리스

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by