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

Question

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);

Answer 1

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