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photon_sim (USS Skipjack's conflicted copy 2010-02-26).m
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photon_sim (USS Skipjack's conflicted copy 2010-02-26).m
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clear all
clc
num_photons = 1e6;
scattering_events = 13;
n_water = 1.33; % index of refraction of water
% harbor water
c = 2.190;
a = 0.366;
[cdf_scatter,angle] = generate_scatter('calc','harbor');
% % coastal water
% c = 0.22 + 0.179;
% a = 0.179;
% [cdf_scatter,angle] = generate_scatter('calc','coastal');
% % Clear water
% c = 0.0374 + 0.114;
% a = 0.114;
% [cdf_scatter,angle] = generate_scatter('calc','clear');
% % Maalox
% c = 0.275;
% a = 0.055;
% scattering_length = zeros(45,1);
% scattering_length(1:3:end) = [1:2:30];
% scattering_length = conv([1 1 1],scattering_length);
scattering_length = [1;
3;
5;5;
7;7;
9;9;9;
11;11;11;11;
13;13;13;13;13;13;13;
15;15;15;15;15;15;15;
17;17;17;17;17;17;17;17;17;17;
19;19;19;19;19;19;19;19;19;19;19;19;19];
albedo = (c-a)/c; % Water albedo is scattering coef./atten. coef. (b/c unitless)
h = waitbar(0.0,'Please wait...','CreateCancelBtn','stop=true; delete(h); clear h');
set(h,'Name','Simulation Progress');
receiver_x = 3.66; % X position of the receiver (in meters)
receiver_y = 0; % Y position of the receiver (in meters)
receiver_z = 0; % Z position of the receiver(in meters)
aperture = 0.0508; % Diameter of aperture (in meters), 0.0508m=2in
fov = 0.0523; % Field of view (in radians)
% 3 deg. -> 0.0523
% 10 deg -> 0.1745
init_angle = atan(receiver_y/receiver_x) % Point transmitter at receiver
init_angle2 = atan(receiver_z/receiver_x) % Point transmitter at receiver
num_sims = length(scattering_length); % How many times to run the simulations
total_time = zeros(num_sims,1);
total_rec_power = zeros(num_sims,1);
total_rec_packets = zeros(num_sims,1);
received_location = [];
travel_distance = [];
receiver_x = (1/c).*scattering_length;
% c = [13.66/num_sims:13.66/num_sims:13.66];
% c = [(3 .* ones(1,40)) (3.27 .* ones(1,50))]
% c = scattering_length./receiver_x;
% a = c.*(1-albedo); % albedo = b/c. a = c-b. a = c-c*albedo = c(1-albedo)
tStart = tic;
matlabpool open local 4
parfor simcount = 1:num_sims
%waitbar(simcount/num_sims,h,['Simulation ' num2str(simcount)]);
[total_time(simcount),total_rec_power(simcount),total_rec_packets(simcount),rec_loc_final,total_rec_dist] = ...
mc_func(num_photons,scattering_events,c,a,receiver_x(simcount),receiver_y,receiver_z,...
aperture,fov,cdf_scatter,angle,init_angle,init_angle2);
received_location = vertcat(received_location,rec_loc_final);
travel_distance = vertcat(travel_distance,total_rec_dist);
end
sim_time = toc(tStart) / 60
close(h)
% figure(1)
% scatter(photon(:,1),photon(:,2),50,log10(photon(:,6)),'.')
matlabpool close
minutes_to_run = total_time/60
%%% Separate multiple simulation runs into one experiment
k=1;
sim_power(k) = total_rec_power(1);
sim_count(k)=1;
for i=2:num_sims
if scattering_length(i) == scattering_length(i-1)
sim_power(k) = sim_power(k)+total_rec_power(i);
sim_count(k) = sim_count(k)+1;
else
k=k+1;
sim_power(k) = total_rec_power(i);
sim_count(k)=1;
end
end
sim_power_norm = sim_power./(sim_count.*num_photons)
%%%
figure(8) % plot 3D histogram of photons on RX plane
hist3(received_location)
set(gcf,'renderer','opengl');
set(get(gca,'child'),'FaceColor','interp','CDataMode','auto');
% figure(10) % Plot histogram of time-of-arrival vs. power
% [N,X] = hist(travel_distance,100);
% pwr_rx_hist = N.*exp(-a.*X);
% stem(X/(3e8/n_water),pwr_rx_hist/sum(total_rec_power))
% xlabel('Time of arrival (sec)')
% ylabel('Percentage of power')
% distance_delta = max(X) - min(X);
% time_delta = distance_delta/(3e8/n_water);
% T = mean(X(2:end) - X(1:end-1))/(3e8/n_water); % Effective "sampling rate" of the histogram
% bandwidth = 1/T; % Normalized frequency in Hz
%
% figure(7)
% freqz(N/sum(total_rec_packets),[1],512,bandwidth) %% plot a frequency response from the histogram data
% figure(9) %% Scatter plot of photons on RX plane
% scatter(rec_loc(:,1),rec_loc(:,2))
% figure(1)
% scatter(photon(:,1),photon(:,2),50,log10(photon(:,6)),'.')
% xlim([-20 150]);
% ylim([-120 120]);
% xlabel('x-axis (m)')
% xlabel('y-axis (m)')
%
% figure(4)
% scatter3(photon(:,1),photon(:,2),photon(:,3),50,log10(photon(:,6)),'.')
% % Draw the box representing the receiver
% line([receiver_x receiver_x],[receiver_y_min receiver_y_min],[receiver_z_max receiver_z_min],'LineWidth',4) % |
% line([receiver_x receiver_x],[receiver_y_min receiver_y_max],[receiver_z_max receiver_z_max],'LineWidth',4) % -
% line([receiver_x receiver_x],[receiver_y_max receiver_y_max],[receiver_z_max receiver_z_min],'LineWidth',4) % |
% line([receiver_x receiver_x],[receiver_y_min receiver_y_max],[receiver_z_min receiver_z_min],'LineWidth',4) % _
% xlabel('x-axis (m)')
% ylabel('y-axis (m)')
% zlabel('z-axis (m)')
% figure(3);
% hist(photon(:,1),max(photon(:,1)));
% figure(2)
% hist(totaldist,20);
% figure(3)
% hist(photon(:,4),20)
findfigs
sprintf('Simulation on DATE with %d photons, %d scattering events.', num_photons*num_sims, scattering_events)
sprintf('C = %d (1/m), A = %d (1/m). FOV = %d (radians). Aperture = %d (m).',c,a,fov,aperture)
sprintf('Receiver at %d, %d, %d (meters)',receiver_x, receiver_y, receiver_z)
% sprintf('Travel distance delta %d (m). Time of arrival delta %d (sec)', distance_delta, time_delta)
% sprintf('Time delta between histogram bins: %d (sec), %d (Hz)',T,bandwidth)
beep
beep
beep
beep