parameters for backscatterRadarTarget and its target

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MatlabQuestion
MatlabQuestion 2018-12-10
编辑： MatlabQuestion 2018-12-19
in the example "Simulating a Polarimetric Radar Return for Weather Observation"
"
azpatangs = [-180 180];
elpatangs = [-90 90];
target = phased.BackscatterRadarTarget('EnablePolarization',true,...
'Model','Nonfluctuating','AzimuthAngles',azpatangs,...
'ElevationAngles',elpatangs,'ShhPattern',shhpat,'ShvPattern',shvpat,...
'SvvPattern',svvpat,'OperatingFrequency',fc);
"
Questions:
  1. angle parameter in the following code "ang_az" should be in the range of the previous defined "azpatangs" ?
" tgtsig = target(txsig,[ang_az;zeros(size(ang_az))],axes);"
2. "ShhPattern" should be the pattern defined with azpatanges and elpatangs?

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Honglei Chen
Honglei Chen 2018-12-11
For question 1, the answer is no. However, the RCS pattern is only defined within the range specified by azpatangs and elpatangs. Therefore, for any angle beyond that region, the return is 0.
For question 2, the answer is yes. More precisely, the pattern region is defined by the parameters AzimuthAngles and ElevationAngles in BackscatterRadarTarget. In this case, they happen to be azpatangs and elpatangs.
HTH
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Honglei Chen
Honglei Chen 2018-12-11
In this case, the RCS is defined for the two ends and I believe they are the same, so in this case you can think that the pattern is constant. In general if you define the two bounds, then the target would interpolate in between.
HTH
MatlabQuestion
MatlabQuestion 2018-12-12
编辑：MatlabQuestion 2018-12-19
I see. Thank you very much for the detail explaination.

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