target angle set up in a radar simulation without phase shifter

Hello Everyone

I am designing a radar system with patch antennas WITHOUT phase shifter. I want to use monopulse or other techniques to know the direction of arrival. How can I setup the angle for the radiator and collector. For example, in the following pseudo code, it defines a radiator and a collector.

radiator = phased.Radiator('Sensor',ura_t,'OperatingFrequency',fc);
collector = phased.Collector('Sensor',ula_r,'OperatingFrequency',fc);

And then I start to transmit and receive the signal, like this:

[tgtrng,tgtang] = rangeangle(tgt_pos,radar_pos);
broad = [0;0];
% Transmit 
txsig = radiator(txsig,tgtang);
% Propagate the signal and reflect off the target
txsig = channel(txsig,radar_pos,tgt_pos,radar_vel,tgt_vel);
txsig = target(txsig);
% received radar return
rxsig = collector(txsig,tgtang);

Based on the above code, in the "radiator" and "collector" functions, should I use the "tgtang" or "broad" as the angle? Again, note that this radar do not have phase shifter.

Thanks

Xining

Answer 1

[Honglei Chen]

You should use tgtang. Note that what you do here is to synthesize the data. Therefore, even though the radar is not steering, you need to know what is the corresponding directional response of the radar toward the target. Therefore you need to use the direction toward the target.

HTH

[Xining Yu]

Thanks for your reply.

I have additional question. For the phased.Collector mentioned here ( https://www.mathworks.com/help/phased/ref/phased.radiator.step.html ), since the user can use input arguments "WEIGHTS" to steer the beam direction, what is the reason of using "STEERANGLE" argument?

Thanks

Xining

[Honglei Chen]

STEERANGLE is only applicable when you have a subarray. In that case, you only have access to apply weight at the subarray level. Within each subarray, the elements could have phase shifters so to enable those phase shifters, you specify STEERANGLE input.

HTH