Matlab first-order low-pass filter
tags: matlab
LPF
First-order low-pass filter
also analyze the air pressure gauge log of the bomber for better comparison
- Create a new variable and store the height in itBaroAlt.mat
- writeGet height value function
- writeLPF function
function output = LPF(x)
persistent lastx Init
if isempty(Init)
lastx = x;
Init = 1;
end
alpha = 0.9;
output = alpha*lastx + (1 - alpha)*x;
lastx = output;
- Write a call scriptRunLPF.m
clear all
Nsamples = 6800;
Xsaved = zeros(Nsamples, 1);
Xmsaved = zeros(Nsamples, 1);
for k=1:Nsamples
xm = GetAlt();
x = LPF(xm);
Xsaved(k) = x;
Xmsaved(k) = xm;
end
dt = 0.02;
t = 0:dt:Nsamples*dt-dt;
figure
hold on
plot(t, Xmsaved, 'r.');
plot(t, Xsaved, 'b');
legend('Measured', 'LPF')
- The experimental results are as follows:
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