Step 1. Rescale from (0,360) to (-pi,+pi)
Step 2. Unwrap the data using UNWRAP
Step 3. Smooth it
Step 4. Rescale from (-pi,+pi) back to (0,360)
Step 5. Rewrap the data using MOD
(Steps 4 and 5 are swappable).
%%Step 0 - Make some phony data
ph = 360*interpft(randn(1,5),1000);
ph = ph+10*randn(size(ph));
ph = mod(ph,360);
figure(1);
plot(ph);
%%Step 1
ph = ph*pi/180-pi;
figure(2);
plot(ph);
%%Step 2
ph = unwrap(ph);
figure(3);
plot(ph);
%%Step 3
ph = smooth(ph,25);
hold on;
plot(ph,'r');
%%Step 4
ph = 180/pi*ph+180;
%%Step 5
ph = mod(ph,360);
figure(1);
hold on;
plot(ph,'r');
