How to resolve this error regarding pulsed waveform library?

I am simulating radar resturns from sea surfaces. For this i am using chaotic signal but since chaotic code is not included in phased array toolbox so i use pulse waveform library to include in it but still it gives me error. Guide me how to resolve it. May be there is another implementation method. Please have a look. It should work correctly since it has worked for other applications.

Error using radarTransceiver
Expected Waveform to be one of these types:

phased.internal.AbstractPulseWaveform, phased.FMCWWaveform, phased.MFSKWaveform

Instead its type was pulseWaveformLibrary.

Error in radarTransceiver/set.Waveform (line 768)
            validateattributes(val,{'phased.internal.AbstractPulseWaveform',...

Error in pleaseplease (line 60)
rdr.Waveform = pulseWaveformLibrary('SampleRate',fs, ...

rng(2021)       % Initialize random number generator

% Radar parameters
freq = 2.4e9;  % Carrier frequency (Hz)
prf = 50000;      % PRF (Hz)
tpd = 2e-5;   % Pulse width (s)
azBw = 4;       % Azimuth beamwidth (deg)
depang = 30;    % Depression angle (deg)
antGain = 45.7; % Antenna gain (dB)
fs = 100e6;      % Sampling frequency (Hz)
bw = 10e5;       % Waveform bandwidth (Hz)
bw2rangeres(bw)
% Sea surface
seaState = 4;   % Sea state number 
vw = 19;        % Wind speed (knots)
L = 512;        % Sea surface length (m) 
resSurface = 2; % Resolution of sea surface (m)

% Calculate wavelength and get speed of light
[lambda,c] = freq2wavelen(freq);

% Setup sensor trajectory and simulation times
rdrht = 100;                                   % Radar platform height (m) 
rdrpos = [-L/2 0 rdrht];                       % Radar position [x y z] (m)
numPulses = 2000;                              % Number of pulses 
scenarioUpdateTime = 1/prf;                    % Scenario update time (sec) 
scenarioUpdateRate = prf;                      % Scenario update rate (Hz)
simTime = scenarioUpdateTime.*(numPulses - 1); % Overall simulation time (sec) 
% Create scenario
scene = radarScenario('UpdateRate',scenarioUpdateRate, ...
    'IsEarthCentered',false,'StopTime',simTime);

% Define Elfouhaily sea spectrum 
seaSpec = seaSpectrum('Resolution',resSurface) % See Elfouhaily reference
% Define reflectivity model
pol = 'V'; % Polarization 
reflectModel = surfaceReflectivity('Sea','Model','GIT','SeaState',seaState,'Polarization',pol)
% Configure sea surface
knots2mps = 0.514444; % Knots to meters/sec
vw = vw*knots2mps; % Wind speed (m/s)
seaSurf = seaSurface(scene,'SpectralModel',seaSpec,'RadarReflectivity',reflectModel, ...
    'WindSpeed',vw,'WindDirection',0,'Boundary',[-L/2 L/2; -L/2 L/2])
% Plot sea surface and radar 
x = -L/2:resSurface:(L/2 - 1); 
y = -L/2:resSurface:(L/2 - 1); 
[xGrid,yGrid] = meshgrid(x,y);
z = height(seaSurf,[xGrid(:).'; yGrid(:).'],scene.SimulationTime); 
% Significant wave height
actSigHgt = helperEstimateSignificantWaveHeight(x,y,z)
expectedSigHgt = [1.25 2.5]; % Sea state 4
actSigHgt >= expectedSigHgt(1) && actSigHgt <= expectedSigHgt(2)
% Create a radar platform using the trajectory information
rdrplat = platform(scene,'Position',rdrpos);

% Create a radar sensor looking to the East
rdr = radarTransceiver('MountingAngles',[0 depang 0],'NumRepetitions',1);
pw = 1e-06;
fcent = 5e+04;

rdr.Waveform = pulseWaveformLibrary('SampleRate',fs, ...
    'WaveformSpecification',{{@ChaoticSignal,prf,pw,bw,fcent}});
rdr.Waveform = rdr.Waveform(1)



% Set receiver sample rate and noise figure
rdr.Receiver.SampleRate = fs;
rdr.Receiver.NoiseFigure = 10; 

% Define transmit and receive antenna and corresponding parameters
ant = phased.SincAntennaElement('Beamwidth',azBw);
rdr.TransmitAntenna.OperatingFrequency = freq;
rdr.ReceiveAntenna.OperatingFrequency = freq;
rdr.Transmitter.Gain = antGain;
rdr.Receiver.Gain = antGain;
rdr.TransmitAntenna.Sensor = ant;
rdr.ReceiveAntenna.Sensor = ant;

% Add radar to radar platform
rdrplat.Sensors = rdr;
% Collect clutter returns with the clutterGenerator
clutterGenerator(scene,rdr); 

% Run the scenario
numSamples = 1/prf*fs;
maxRange = 3e3; 
Trng = (0:1/fs:(numSamples-1)/fs);
rngGrid = [0 time2range(Trng(2:end),c)];
[~,idxTruncate] = min(abs(rngGrid - maxRange));
iqsig = zeros(idxTruncate,numPulses);
ii = 1; 
hRaw = helperPlotRawIQ(iqsig);
while advance(scene)
    tmp = receive(scene); % nsamp x 1
    iqsig(:,ii) = tmp{1}(1:idxTruncate); 
    if mod(ii,128) == 0
        helperUpdatePlotRawIQ(hRaw,iqsig);
    end
    ii = ii + 1;
end
helperUpdatePlotRawIQ(hRaw,iqsig);
% Pulse compress
matchingCoeff = getMatchedFilter(rdr.Waveform);
rngresp = phased.RangeResponse('RangeMethod', 'Matched filter', ...
    'PropagationSpeed',c,'SampleRate',fs);
[pcResp,rngGrid] = rngresp(iqsig,matchingCoeff); 

% Plot
pcsigMagdB = mag2db(abs(pcResp));
[maxVal,maxIdx] = max(pcsigMagdB(:));
pcsigMagdB = pcsigMagdB - maxVal;
helperRangeTimePlot(rngGrid,prf,pcsigMagdB);
% Plot magnitude versus time
[idxRange,~] = ind2sub(size(pcsigMagdB),maxIdx); 
helperMagTimePlot(pcsigMagdB(idxRange,:),numPulses,prf,rngGrid(idxRange));
% STFT
[S,F,T] = stft(pcResp(idxRange,:),scenarioUpdateRate);
helperSTFTPlot(S,F,T,lambda,rngGrid(idxRange));
% Look at a subset of data in range and convert to decibel scale
[~,idxMin] = min(abs(rngGrid - 180)); 
[~,idxMax] = min(abs(rngGrid - 210)); 
pcsigMagdB = mag2db(abs(pcResp(idxMin:idxMax,:)));

% Remove any inf values
pcsigMagdB(isinf(pcsigMagdB(:))) = []; 

% Shift values to be positive
pcsigMagdB = pcsigMagdB(:) - min(pcsigMagdB(:)) + eps; 

% Weibull parameters
% Note: These values can be obtained if you use fitdist(pcsigMagdB,'weibull')
scale = 32.5013;
shape = 6.3313;

% Plot histogram with theoretical PDF overlay
helperHistPlot(pcsigMagdB,scale,shape);

Answer 1

[Sara James]

The radarTransceiver feature does not support pulsedWaveformLibrary inputs. Documented accepted waveform types are as follows:

• phased.RectangularWaveform
• phased.LinearFMWaveform
• phased.PhaseCodedWaveform
• phased.SteppedFMWaveform
• phased.FMCWWaveform
• phased.MFSKWaveform