Sonar range and speed/doppler output using phased.Ran​geDopplerR​esponse with match filtering

%I setup the rangedopresp using the setup for s ingle acoustic projector
%and hydrophone.

% I succesffully created the IQ cube and can plot the slow and fast times.  

fs = 60e3;
propSpeed = 1500;
fc = 30000;
prf = 0.25;
ndop = 2048;

rangedopresp = phased.RangeDopplerResponse( ...
    'SampleRate', fs, ...
    'PropagationSpeed',propSpeed, ...
    'DopplerFFTLengthSource','Property', ...
    'DopplerFFTLength',ndop, ...
    'DopplerOutput','Speed', ...
    'MaximumNumInputSamplesSource', 'Property', ...
    'MaximumNumInputSamples', 240000, ...
    'OperatingFrequency', fc, ...
    'PRFSource', 'Property',...
    'PRF', prf);


% Converting in the final step for range and speed using
[rngdopresp,rnggrid,dopgrid] = rangedopresp(cube,coeff); 

Unrecognized function or variable 'cube'.

% the resulting Range - Doppler map show the correct range but the 
% speed range is very small -3e-3 to 3e-3 m/s
% If I set the speed to zero the result is as expected.
% for anyother speed greater than +- 3e-3 it is outside the range.
% I have not been able to identify how to get the correct speed range
%  
% help will be appreciated

[Torsten]

"ndop" is a missing variable.

[Joe Cuschieri]

missed that but it is defined

ndop = 2048