This document contains sample MATLAB code for designing and analyzing radar systems. It includes examples for waveform design, target detection, beamforming, and space-time adaptive processing. The code samples show how to perform tasks like plotting the array response, displaying range Doppler maps and estimated target ranges, visualizing antenna and target trajectories in both global and local coordinate systems, and streaming radar return signals.

1. SEQUENTIAL RADAR TRACKING (SAMPLE ASSIGNMENT)
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Designing And Analyzing Radar Systems
This sample assignment shows techniques for designing and analyzing radar systems
and how you can perform radar system design and analysis tasks such as waveform
design, target detection, beamforming, and space-time adaptive processing. file and
execute the following examples:
1) ex1.m
2) ex2.m
3) ex3.m
ex1.m
%Copyright 2013 The MathWorks, Inc
clear all;close all;clc;sAnt = lowProfileArray('FrequencyRange',[2e9
ex2.m
%Copyright 2013 The MathWorks, Inc
clear all;close all;clc;beamformingExample
ex3.m
%Copyright 2013 The MathWorks, Inc
clear all;close all;clc;rangeDopplerStreamExample
plotBeam.m
%Copyright 2013 The MathWorks, Inc
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2. if ii==1,
%% Array Response
figure('WindowStyle','docked');
polar(deg2rad(scanAz(:)),abs(resp));
ax = gca;
else
polar(ax,deg2rad(scanAz(:)),abs(resp));
end
viewSignals.m
% Copyright 2013 The MathWorks, Inc
%% Setup Visuals
if m == 1
sScope = dsp.TimeScope('SampleRate',fs,...
'TimeSpan',10/prf,'Grid',true,...
'LayoutDimensions',[1 2],'MaximizeAxes','off', ...
'Position',[371 646 1000 409],'NumInputPorts',2);
set(sScope,'ActiveDisplay',2,'YLabel','Magnitude','Title','Collected Signal')
set(sScope,'ActiveDisplay',1,'YLabel','Magnitude','Title','Transmitted Signal')
show(sScope);
%% Range Doppler Map
figure('WindowStyle','docked')
hrdmap = imagesc(sgrid,rgrid,abs(rdmap));
xlabel('Speed (m/s)'); ylabel('Range (m)'); title('Range Doppler Map');
%% Detection and Range Estimation
figure('WindowStyle','docked')
tgtrange = [NaN NaN NaN]; pmax = tgtrange;
hold on
for n=1:3,
plot(sTgtMotion{n}.InitialPosition(1)*ones(2,1),[0 7e-5],'r:')
htext(n) = text(tgtrange(n),1.05*pmax(n),int2str(tgtrange(n))); %#ok<*SAGROW>
end
legend('Initial Range')
xlabel('Range (m)'); ylabel('Magnitude'); title ('Estimated Range')
hbar = sqrt(threshold)*ones(numel(fast_time),1);
hline = plot(range_gates,[hbar hbar]); % Threshold
offset = numel(sMFilt.Coefficients)-1;
end
%% Stream Signals
step(sScope,abs(s),abs(rsig)); % Ctrl + A to scale axis limits
set(hrdmap,'CData',abs(fliplr(rdmap)))
drawnow

3. set(hline(2),'YData',[intpulses(offset:numel(fast_time)); NaN*ones(offset-1,1)])
for n=1:3,
set(htext(n),'String',int2str(tgtrange(n)),'Position',[tgtrange(n) 1.05*pmax(n)]);
end
viewTrajectories.m
%Copyright 2013 The MathWorks, Inc
if ii==1,
%% Global Coordinate System
figure('WindowStyle','docked');
hold on; grid on
antT = nan(3,N); % Array trajectory
tgtT = nan(3,N); % Target trajectory
antT = [antT(:,2:end) antpos/1e3];
tgtT = [tgtT(:,2:end) tgtpos/1e3];
hant = plot3(antT(1,:),antT(2,:),antT(3,:),'LineWidth',2);
htgt = plot3(tgtT(1,:),tgtT(2,:),tgtT(3,:),'LineWidth',2,'Color','red');
axis([-100 100 -100 50 0 50])
xlabel('X'), ylabel('Y'), zlabel('Z')
title('Global Coordinate System','FontWeight','bold')
view(40,48)
legend('Antenna','Target')
%% Target Trajectory in Local Coordinate System (from antenna perspective)
h2 = figure('WindowStyle','docked');
hold on; grid on
axis([-130 0 6 13 0 50])
xlabel('Azimuth'), ylabel('Range'), zlabel('Elevation')
title('Local Coordinate System','FontWeight','bold')
view(-40,48)
%% Array visualization
figure('WindowStyle','docked');
viewArray(sAnt,'ShowSubarray','None')
bx = get(gca,'Children');
hdots = bx(8);
ndots = numel(get(hdots,'XData'));
green = ones(ndots,1)*[0 1 0];
view(40,48)
else
%% Highlight active arrays
mn=face(:)*ones(1,ndots);
hlgt=repmat([mn(1,1:16) mn(2,17:32) mn(3,33:48) mn(4,49:64)],3,1);
set(hdots,'CData',green.*hlgt');
%% Update global trajectories
antT = [antT(:,2:end) antpos/1e3];

4. tgtT = [tgtT(:,2:end) tgtpos/1e3];
set(hant,'XData',antT(1,:),'YData',antT(2,:),'ZData',antT(3,:))
set(htgt,'XData',tgtT(1,:),'YData',tgtT(2,:),'ZData',tgtT(3,:))
end
%% Update local trajectory
figure(h2)
plot3(AzEl(1),range/1e4,AzEl(2),'ro','MarkerSize',20-round(range/1e4))
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