资源简介
Dan Simon的经典大作《Optimal State Estimation》对应的Matlab源程序。包含了基本的线性Kalman滤波、EKF、UKF、粒子滤波等基本算法。适合学习滤波理论的人员。
代码片段和文件信息
function Colored(flag corr)
% Kalman filter simulation with colored (time correlated) measurement noise.
% INPUTS:
% flag = 0 means ignore the time correlation of the measurement noise
% 1 means augment the system state
% 2 means use the Bryson/Henrikson approach
% corr = magnitude of measurement noise correlation <= 1
kf = 500; % Number of time steps in simulation
phi = [0.7 -0.15; 0.03 0.79];
H = [1 0; 0 1];
psi = [corr 0; 0 corr];
L = [0.15; 0.21];
Q = L * [1] * L‘;
Qv = [0.05 0; 0 0.05];
phi1 = [phi zeros(22); zeros(22) psi];
Q1 = [Q zeros(22); zeros(22) Qv];
R1 = zeros(22);
H1 = [H eye(22)];
if (flag == 0)
n = 2; % number of states
R = Qv;
stitle = ‘Correlation Ignored‘;
elseif (flag == 1)
n = 4; % number of states
stitle = ‘Augmented State‘;
elseif (flag == 2)
n = 2; % number of states
R = H * Q * H‘ + Qv;
M = Q * H‘;
D = H * phi - psi * H;
stitle = ‘Bryson and Henrikson‘;
else
disp(‘illegal input argument‘);
end
% Assume xhat(0) = x(0) = 0.
x = zeros(41); xhatplus = zeros(n1); xhatminus = zeros(n1);
z = zeros(21);
% Assume P(0) = 0.
Pplus = zeros(nn); Pminus = zeros(nn);
xArray = []; xhatArray = []; KArray = []; PArray = []; zArray = [];
randn(‘state‘ 0);
for k = 1 : kf
% Simulate the system
StateNoise = randn;
n(11) = L(11) * StateNoise;
n(21) = L(21) * StateNoise;
n(31) = sqrt(Qv(11)) * randn;
n(41) = sqrt(Qv(22)) * randn;
x = phi1 * x + n;
zold = z;
z = H1 * x;
% Run the Kalman filter
if (flag == 0)
% Ignore the time correlation
Pminus = phi * Pplus * phi‘ + Q;
K = inv(H * Pminus * H‘ + R);
K = (Pminus * H‘) * K;
xhatminus = phi * xhatplus;
xhatplus = xhatminus + K * (z - H * xhatminus);
Pplus = Pminus - K * H * Pminus;
elseif (flag == 1)
% Use the augmented state approach
Pminus = phi1 * Pplus * phi1‘ + Q1;
K = inv(H1 * Pminus * H1‘ + R1);
K = (Pminus * H1‘) * K;
xhatminus = phi1 * xhatplus;
xhatplus = xhatminus + K * (z - H1 * xhatminus);
Pplus = Pminus - K * H1 * Pminus;
elseif (flag == 2)
% Use the Bryson/Henrikson approach
zeta = z - psi * zold;
C = M * inv(D * Pminus * D‘ + R);
K = Pminus * D‘ * inv(D * Pminus * D‘ + R);
xhatplus = xhatminus + K * (zeta - D * xhatminus);
xhatminus = phi * xhatplus + C * (zeta - D * xhatplus);
Pplus = (eye(2) - K * D) * Pminus * (eye(2) - K * D)‘ + K * R * K‘;
Pminus = phi * Pplus * phi‘ + Q - C * M‘ - phi * K * M - M‘ * K‘ * phi‘;
xhatplus = xhatminus;
end
% Save data for plotting.
xArray = [xArray x];
xhatArray = [xhatArray xhatplus];
KArray = [KArray K];
PArray = [PArray Pplus];
zArray = [zArray z];
end
% Plot.
k = 1 : kf;
close all;
figure;
plot(k zArray(1:) - xArray(1:) ‘-‘ k xArray(1:) - xhatArray(1:) ‘
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 442575 2007-04-28 22:20 OptimalStateEstimation\hinfinity.pdf
文件 435748 2007-04-28 22:23 OptimalStateEstimation\kalman.pdf
文件 3106 2007-04-28 22:18 OptimalStateEstimation\HybridBody.m
文件 4828 2007-04-28 22:15 OptimalStateEstimation\MotorSim.m
文件 5132 2007-04-28 22:18 OptimalStateEstimation\HybridUKF.m
文件 1172 2007-04-28 22:16 OptimalStateEstimation\LinearSimEx1.m
文件 2917 2007-04-28 22:18 OptimalStateEstimation\UnscentedEx.m
文件 1435 2007-04-28 22:17 OptimalStateEstimation\DiscreteKFAlt.m
文件 5816 2007-04-28 22:18 OptimalStateEstimation\ParticleEx2.m
文件 1998 2007-04-28 22:17 OptimalStateEstimation\DiscreteKFEx1.m
文件 3582 2007-04-28 22:18 OptimalStateEstimation\ParticleEx1.m
文件 1840 2007-04-28 22:17 OptimalStateEstimation\DiscreteKFEx2.m
文件 7676 2007-04-28 22:18 OptimalStateEstimation\ParticleEx4.m
文件 899 2007-04-28 22:17 OptimalStateEstimation\DiscreteKFEx2Plot.m
文件 7992 2007-04-28 22:18 OptimalStateEstimation\ParticleEx5.m
文件 3836 2007-04-28 22:17 OptimalStateEstimation\Colored.m
文件 6115 2007-04-28 22:19 OptimalStateEstimation\ParticleEx3.m
文件 231841 2007-04-28 22:21 OptimalStateEstimation\ESDNonlinear.pdf
文件 2849 2007-04-28 22:17 OptimalStateEstimation\Correlated.m
文件 2078 2007-04-28 22:18 OptimalStateEstimation\ContEx.m
文件 7741 2007-04-28 22:18 OptimalStateEstimation\KalmanConstrained.m
文件 5058 2007-04-28 22:18 OptimalStateEstimation\FixPtSmooth.m
文件 3213 2007-04-28 22:18 OptimalStateEstimation\FixLagSmooth.m
文件 3069 2007-04-28 22:18 OptimalStateEstimation\Multiple.m
文件 4192 2007-04-28 22:18 OptimalStateEstimation\FixIntSmooth.m
文件 6755 2007-04-28 22:18 OptimalStateEstimation\Reduced.m
文件 5057 2007-04-28 22:18 OptimalStateEstimation\Robust.m
文件 2095 2007-04-28 22:18 OptimalStateEstimation\Schmidt.m
文件 3000 2007-04-28 22:18 OptimalStateEstimation\ExtendedBody.m
文件 4633 2007-04-28 22:18 OptimalStateEstimation\MotorKalman.m
............此处省略6个文件信息
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