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how can i run iterations?

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Postit123
Postit123 on 3 Oct 2020
Edited: KALYAN ACHARJYA on 3 Oct 2020
Hi
I'd like to replace "ep" matrix with "new" matrix for next iteration until the difference between new and ep gets lower than 0.01.
I think all I need is a simple equation that can relate "ep" and "new", but I have no idea how to do that.
function [H,y,true] = guess_new(sat,psr,ep,er,c)
% sat [nX4] * n = the number of satellites
% ep [1X3] : estimated position
% c : light of speed
% psr : pseudorange [nX1]
% er : user clock error
%%
n = size(sat,1);
new = ones(4,1);
while abs(new(1:3)- ep) > 0.01
for i = 1 : n
x(i) = (ep(1) - sat(i,1));
y(i) = (ep(2) - sat(i,2));
z(i) = (ep(3) - sat(i,3));
rho(i) = sqrt(x(i)^2+y(i)^2+z(i)^2);
G(i) = rho(i) + c*er;
end
% Partial Matrix H
H = [x(:) y(:) z(:) c*ones(n,1)]./rho(:);
% Measurement residual vector y
y = [psr(:) - G(:)];
% delta x,y,z,time error
del = inv(H.'*H)*H.'*y;
% update the initial guess
new = [ep'; er] + del;
end
true = new;

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Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 3 Oct 2020
Edited: KALYAN ACHARJYA on 3 Oct 2020
......
while abs(new(1:3)- ep)>0.01
for i = 1 : n
x(i) = (ep(1) - sat(i,1));
y(i) = (ep(2) - sat(i,2));
z(i) = (ep(3) - sat(i,3));
rho(i) = sqrt(x(i)^2+y(i)^2+z(i)^2);
G(i) = rho(i) + c*er;
end
ep=new; % Replace ep with new
end
......
Note: Please note on generation of new "new" after execution of for loop.

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