?? mticalcvelocityfromfourier.m
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function vel = MTIcalcVelocityFromFourier(energyInFreqRangeCells,ind,freqRes,intermidateFreq,PRI)
% vel = MTIcalcVelocityFromFourier(energyInFreqRangeCells,ind,freqRes,intermidateFreq,PRI)
[range freq] = ind2sub(size(energyInFreqRangeCells).*[1 0.5],ind);
if freq < freqRes & freq > 1
sig = energyInFreqRangeCells(range, freq-1:freq+1);
freq = parbolFit( (freq-freqRes/2-2:freq-freqRes/2)/freqRes/PRI,sig );
if abs(freq) < 1
freq = 0;
end
vel = 3e8*freq/(2*intermidateFreq);
else
vel = 3e8*(freq-freqRes/2)/(2*intermidateFreq);
end
function x0 = parbolFit(x,y)
c = y(2);
a = (y(1)+y(3)-2*c)*0.5;
b = y(3)-c-a;
peak = -b/(2*a);
x0 = x(2)+peak*(x(3)-x(2));
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