too many input arguments in my code!
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% input parameters
c = 3e8;
f0 = 24.005e9;
lambda = c/f0;
bw = 240e6;
fs=2*bw;
Rmax = 100;
tm = 5.5*range2time(Rmax,c);
fb=4.3636e+07;
%radar setup
waveform = phased.FMCWWaveform('SweepTime',tm,'SweepBandwidth',bw,...
'SampleRate',fs);
%target
tar_dist = 5;
tar_speed = 0;
tar_rcs = db2pow(min(10*log10(tar_dist)+5,20));
target = phased.RadarTarget('MeanRCS',tar_rcs,'PropagationSpeed',c,...
'OperatingFrequency',f0);
tarmotion = phased.Platform('InitialPosition',[tar_dist;0;0],...
'Velocity',[tar_speed;0;0]);
%environment
channel = phased.FreeSpace('PropagationSpeed',c,...
'OperatingFrequency',f0,'SampleRate',fs,'TwoWayPropagation',true);
antenna = patchMicrostrip('Length',75e-3, 'Width',37e-3,...
'GroundPlaneLength',120e-3, 'GroundPlaneWidth',120e-3);
%show(antenna)
ant_aperture = 0.002775; % in square meter
ant_gain = aperture2gain(ant_aperture,lambda); % in dB
tx_power = 0.85; % in watts
tx_gain = 9+ant_gain % in dB
rx_gain = 15+ant_gain; % in dB
rx_nf = 4.5; % in dB
transmitter = phased.Transmitter('PeakPower',tx_power,'Gain',tx_gain);
receiver = phased.ReceiverPreamp('Gain',rx_gain,'NoiseFigure',rx_nf,...
'SampleRate',fs);
radar_speed = 0;
radarmotion = phased.Platform('InitialPosition',[0;0;0],...
'Velocity',[radar_speed;0;0]);
%simulation%
rng(2012);
Nsweep = 64;
xr = complex(zeros(fix(waveform.SampleRate*waveform.SweepTime,Nsweep)));
for m = 1:Nsweep
% Update radar and target positions
[radar_pos,radar_vel] = radarmotion(waveform.SweepTime);
[tgt_pos,tgt_vel] = tarmotion(waveform.SweepTime);
% Transmit FMCW waveform
sig = waveform();
txsig = transmitter(sig);
% Propagate the signal and reflect off the target
txsig = channel(txsig,radar_pos,tgt_pos,radar_vel,tgt_vel);
txsig = target(txsig);
% Dechirp the received radar return
txsig = receiver(txsig);
dechirpsig = dechirp(txsig,sig);
end
Dn = fix(fs/(2*fb));
for m = size(xr,2):-1:1
xr_d(:,m) = decimate(xr(:,m),Dn,'FIR');
end
fs_d = fs/Dn;
fb_rng = rootmusic(pulsint(xr_d,'coherent'),1,fs_d);
rng_est = beat2range(fb_rng,sweep_slope,c)
i am getting these errors:
1. too many input arguments in : xr = complex(zeros(fix(waveform.SampleRate*waveform.SweepTime,Nsweep)));
2. Error using rootmusic,
Real signals require an even number p of complex sinusoids in: fb_rng = rootmusic(pulsint(xr_d,'coherent'),1,fs_d);
can anyone help?
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Answers (1)
Steven Lord
on 23 Jul 2020
Edited: Steven Lord
on 23 Jul 2020
For your first question, let's split out the innermost function call on that line of code.
xr = complex(zeros(fix(waveform.SampleRate*waveform.SweepTime,Nsweep)));
innermost = fix(waveform.SampleRate*waveform.SweepTime,Nsweep);
xr = complex(zeros(innermost));
The fix function only accepts one input argument. You're trying to pass two into it. I believe you just have a misplaced parenthesis.
xr = complex(zeros(fix(waveform.SampleRate*waveform.SweepTime),Nsweep));
% or splitting into pieces
innermost = fix(waveform.SampleRate*waveform.SweepTime);
middle = zeros(innermost,Nsweep);
xr = complex(middle);
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