coder.extrinsic error! Radar designing

I am scanning an area from 0 to 45 degrees Azimuth using simulink blocks for FMCW radar. I used function block to write the code as was mentioned in radar scan example. The output of coder.extrinsic of phased.Radiator is mxarray and when I tried to assign it as follows I get an error " MATLAB expression 'phased.Radiator' is not of the correct class: expected 'struct', found 'phased.Radiator'". I preinitialized it already also. Same is the case with ant_array

coder.extrinsic('Phased.CosineAntennaElement','phased.Radiator','phased.URA');
sCos=phased.CosineAntennaElement('FrequencyRange', [35.5e9 36.5e9]);
hradiator=struct('Sensor', zeros(30), 'OperatingFrequency', fc);
hradiator=phased.Radiator('Sensor',sCos,'OperatingFrequency',fc);
ant_array = phased.URA('Element',sCos,'Size',[30 30],'ElementSpacing',[lambda/2, lambda/2]);
hradiator.Sensor = ant_array;

Answer 1

[Honglei Chen]

coder.extrinsic should have no effect in regular MATLAB. It only applicable when you try to generate the code. But I'm not sure what you are trying to achieve here. Once you are in codegen mode, if you set hradiator to struct and later assign a phased.Radiator class to it, then it is expected to error out because you now changed the type of hradiator.

HTH

[Hassam Mahmood]

I am trying to do sector scanning by using phased arrays of 30by30 and convering 45 degrees azimuth. I am uploading my model for better understanding. Kindly look into the code of Function block.

[Honglei Chen]

What version are you using? You should be able to use the blocks from Phased Array System Toolbox directly

[Hassam Mahmood]

I am using blocks from it, version is 2015b. Have you checked my model? I don't know if there is any existing block for SCANNING. I am aware of Tx narrowband for phased array URA antenna

[Honglei Chen]

I looked at your model but right now I don't have time to modify it. For the Phased Array System Toolbox, there is almost a 1-1 mapping between MATLAB and Simulink. In my opinion you are just trying to do the phased.Radiator in your MATLAB Function block and the corresponding block that you can use to represent the radiator is the Narrwoband Transmit Array block.

https://www.mathworks.com/help/phased/ref/narrowbandtransmitarray.html

You can then see how things are implemented in MATLAB to connect the blocks. If you need to compute the angle, you can use the Range Angle Calculator

https://www.mathworks.com/help/phased/ref/rangeanglecalculator.html

You may need to use phased.SteeringVector in MATLAB Function block to compute the steering vector though.

HTH

[Hassam Mahmood]

I appreciate your help. I made progress and resolved this issue, I made a new thread and I am looking forward for your reply