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with non-additive noise process.
make noise a parameter of the state and measurement functions directly
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‎Extended-Kalman-Filter-Algorithm.mltbx‎

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‎Extended-Kalman-Filter-Algorithm.prj‎

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<param.products.id />
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<param.products.version />
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<param.platforms />
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<param.guid>cedafdb9-6a59-4c93-a3b5-ddf093b20511</param.guid>
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<param.exclude.filters>% List files contained in your toolbox folder that you would like to exclude
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% from packaging. Excludes should be listed relative to the toolbox folder.
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% Some examples of how to specify excludes are provided below:
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%
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% A single file in the toolbox folder:
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.git
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<param.guid>d358422b-cb2d-4baa-ba50-a173a644611f</param.guid>
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<param.exclude.filters>.git
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simulation
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.gitignore
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LICENSE
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Report
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.gitattributes
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README.md
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%
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% A single file in a subfolder of the toolbox folder:
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% example/.svn
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%
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% All files in a subfolder of the toolbox folder:
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% example/*
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%
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% All files of a certain name in all subfolders of the toolbox folder:
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% **/.svn
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%
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% All files matching a pattern in all subfolders of the toolbox folder:
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% **/*.bak
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%</param.exclude.filters>
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demos.xml
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html</param.exclude.filters>
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<param.exclude.pcodedmfiles>true</param.exclude.pcodedmfiles>
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<param.examples />
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<param.demosxml />

‎demos.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<demos><!--This is an autogenerated file, please do not modify-->
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<name>Extended-Kalman-Filter-Algorithm</name>
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<type>toolbox</type>
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<icon>HelpIcon.DEMOS</icon>
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<website/>
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<description/>
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<demosection>
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<label>Extended-Kalman-Filter-Algorithm</label>
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<demoitem>
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<label>ExtendedKF</label>
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<type>other</type>
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<source>ExtendedKF</source>
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<file>html/ExtendedKF.html</file>
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</demoitem>
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</demosection>
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</demos>

‎html/ExtendedKF.html‎

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<html><head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!--
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This HTML was auto-generated from MATLAB code.
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To make changes, update the MATLAB code and republish this document.
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--><title>ExtendedKF</title><meta name="generator" content="MATLAB 9.10"><link rel="schema.DC" href="http://purl.org/dc/elements/1.1/"><meta name="DC.date" content="2021-08-14"><meta name="DC.source" content="ExtendedKF.m"><style type="text/css">
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</style></head><body><div class="content"><pre class="codeinput"><span class="keyword">classdef</span> ExtendedKF &lt; handle
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<span class="keyword">properties</span>
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predhistory
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truehistory
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Plast
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statetransitionfcn
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measurementfcn
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statej
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measurementj
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statecovariance
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measurementcovariance
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T
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xk
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k
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vk <span class="comment">%plant noise</span>
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wk <span class="comment">%measurement noise</span>
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state_dim
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measurement_dim
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hasadditivenoise
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measurementhistory
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<span class="keyword">end</span>
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<span class="keyword">methods</span>
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<span class="comment">%constructor of class</span>
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<span class="keyword">function</span> self = ExtendedKF(statetransition_f, measurement_f,<span class="keyword">...</span>
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state_j, measurement_j, state_covariance,<span class="keyword">...</span>
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measurement_covariance, sampling_time, initial_x, additivenoise)
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<span class="keyword">if</span> nargin == 9
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self.statetransitionfcn = statetransition_f;
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self.measurementfcn = measurement_f;
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self.statej = state_j;
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self.measurementj = measurement_j;
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self.statecovariance = state_covariance;
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self.measurementcovariance = measurement_covariance;
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self.T = sampling_time;
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self.state_dim = size(self.statecovariance(:, 1));
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self.measurement_dim = size(self.measurementcovariance(:, 1));
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self.truehistory(:, 1) = initial_x;
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self.predhistory = zeros(self.state_dim);
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self.measurementhistory = zeros(self.measurement_dim);
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self.k = 1;
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self.hasadditivenoise = additivenoise;
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self.Plast = eye(self.state_dim(1));
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<span class="keyword">end</span>
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<span class="keyword">end</span>
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<span class="keyword">function</span> [Xpred, Ppred] = predict(self)
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<span class="comment">%create plant noise</span>
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self.vk = sqrt(self.statecovariance)*randn(self.state_dim(1), 1);
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<span class="comment">%create noisy plant state: REFERENCE VALUE</span>
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xtrue_last = self.predhistory(:, end);
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xtrue = self.statetransitionfcn(xtrue_last, self.T, 0);
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self.xk = self.statetransitionfcn(xtrue_last, self.T, self.vk);
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xhat_last = self.predhistory(:, end);
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F = self.statej(xhat_last, self.T);
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Xpred = self.statetransitionfcn(xhat_last, self.T, 0);
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Ppred = F*(self.Plast)*F' + self.statecovariance;
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<span class="comment">%save the new values:</span>
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self.k = self.k+1;
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self.Plast = Ppred;
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self.predhistory(:, self.k) = Xpred;
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self.truehistory(:, self.k) = xtrue;
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<span class="keyword">end</span>
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<span class="keyword">function</span> [Xcorr, Pcorr] = correct(self)
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<span class="comment">%create measurement noise</span>
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self.wk = sqrt(self.measurementcovariance)*randn(self.measurement_dim(1), 1);
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<span class="comment">%create true measurement</span>
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yk = self.measurementfcn(self.xk, self.T, self.wk);
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<span class="comment">%correcting measurement</span>
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Xpred = self.predhistory(:, self.k);
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H = self.measurementj(Xpred, self.T);
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Ypred = self.measurementfcn(Xpred, self.T, 0);
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Sk = H*self.Plast*H' + self.measurementcovariance;
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Kk = self.Plast*H'*inv(Sk);
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<span class="comment">%correct the readings</span>
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Xcorr = Xpred+Kk*(yk-Ypred);
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Pcorr = self.Plast - Kk*H*self.Plast;
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<span class="comment">%overwrite to existing values:</span>
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<span class="comment">% self.measurementhistory(:, self.k) = yk;</span>
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self.Plast = Pcorr;
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self.predhistory(:, self.k) = Xcorr;
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<span class="keyword">end</span>
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<span class="keyword">end</span>
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<span class="keyword">end</span>
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</pre><p class="footer"><br><a href="https://www.mathworks.com/products/matlab/">Published with MATLAB&reg; R2021a</a><br></p></div><!--
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##### SOURCE BEGIN #####
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classdef ExtendedKF < handle
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properties
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predhistory
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truehistory
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Plast
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statetransitionfcn
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measurementfcn
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statej
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measurementj
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statecovariance
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measurementcovariance
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T
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xk
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k
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vk %plant noise
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wk %measurement noise
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state_dim
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measurement_dim
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hasadditivenoise
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measurementhistory
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end
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methods
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%constructor of class
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function self = ExtendedKF(statetransition_f, measurement_f,...
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state_j, measurement_j, state_covariance,...
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measurement_covariance, sampling_time, initial_x, additivenoise)
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if nargin == 9
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self.statetransitionfcn = statetransition_f;
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self.measurementfcn = measurement_f;
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self.statej = state_j;
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self.measurementj = measurement_j;
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self.statecovariance = state_covariance;
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self.measurementcovariance = measurement_covariance;
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self.T = sampling_time;
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self.state_dim = size(self.statecovariance(:, 1));
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self.measurement_dim = size(self.measurementcovariance(:, 1));
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self.truehistory(:, 1) = initial_x;
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self.predhistory = zeros(self.state_dim);
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self.measurementhistory = zeros(self.measurement_dim);
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self.k = 1;
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self.hasadditivenoise = additivenoise;
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self.Plast = eye(self.state_dim(1));
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end
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end
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function [Xpred, Ppred] = predict(self)
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%create plant noise
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self.vk = sqrt(self.statecovariance)*randn(self.state_dim(1), 1);
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%create noisy plant state: REFERENCE VALUE
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xtrue_last = self.predhistory(:, end);
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xtrue = self.statetransitionfcn(xtrue_last, self.T, 0);
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self.xk = self.statetransitionfcn(xtrue_last, self.T, self.vk);
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xhat_last = self.predhistory(:, end);
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F = self.statej(xhat_last, self.T);
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Xpred = self.statetransitionfcn(xhat_last, self.T, 0);
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Ppred = F*(self.Plast)*F' + self.statecovariance;
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%save the new values:
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self.k = self.k+1;
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self.Plast = Ppred;
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self.predhistory(:, self.k) = Xpred;
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self.truehistory(:, self.k) = xtrue;
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end
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function [Xcorr, Pcorr] = correct(self)
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%create measurement noise
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self.wk = sqrt(self.measurementcovariance)*randn(self.measurement_dim(1), 1);
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%create true measurement
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yk = self.measurementfcn(self.xk, self.T, self.wk);
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%correcting measurement
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Xpred = self.predhistory(:, self.k);
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H = self.measurementj(Xpred, self.T);
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Ypred = self.measurementfcn(Xpred, self.T, 0);
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Sk = H*self.Plast*H' + self.measurementcovariance;
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Kk = self.Plast*H'*inv(Sk);
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%correct the readings
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Xcorr = Xpred+Kk*(yk-Ypred);
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Pcorr = self.Plast - Kk*H*self.Plast;
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%overwrite to existing values:
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% self.measurementhistory(:, self.k) = yk;
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self.Plast = Pcorr;
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self.predhistory(:, self.k) = Xcorr;
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end
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end
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end
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##### SOURCE END #####
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--></body></html>

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