Why using imagesc and plotResponse to plot range-doppler map give different magnitude level?
2 views (last 30 days)
Show older comments
I am using the phased.RangeDopplerResponse and the dechirped signal xr_con to generate the range-doppler response. The code is given below. With the same xr_con here, why the imagesc and plotResponse give different maximum magnitude output?
For imagesc, the maximum magnitude is 46.1634 but the plotResponse gives 56.1634, where there is exactly a 10 dB difference here.
As far as I know, for default of plotResponse, the magnitude is in 'dB' as well.
I checked that, for magnitude, both plots are the same. However, for dB plot, somehow, they are different.
rngdopresp = phased.RangeDopplerResponse('PropagationSpeed',c,...
'DopplerOutput','Speed','OperatingFrequency',fc,'SampleRate',fs,...
'RangeMethod','FFT','SweepSlope',slope,...
'RangeFFTLengthSource','Property','RangeFFTLength',1024,...
'DopplerFFTLengthSource','Property','DopplerFFTLength',256);
% clf;
[resp,rng_grid,dop_grid] = rngdopresp(xr_con);
figure;
imagesc(dop_grid,rng_grid,mag2db(abs(resp)));
xlabel('Speed (m/s)');
ylabel('Range (m)');
title('Range-Doppler Map');
figure;
plotResponse(rngdopresp,xr_con); % Plot range Doppler map
axis([-v_max v_max 0 d_max])
clim1 = caxis;
0 Comments
Answers (0)
See Also
Categories
Find more on Detection in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!