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    filename: easy13.m
    path of file: ./repos/nav_matlab/example/gps_spp_test/easysuite
    
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%EASY13 Script for computing parity vector and HPL

%Kai Borre 01-07-2008
%Copyright (c) by Kai Borre
% Revison 1.2 is due to a kind remark by Dr. David Y. Hsu

%$Revision: 1.2 $  $Date: 2009/09/05  $

b = [    -1.05;
          0.
    
function with phi and lambda as parameters 
phi = 57;
lambda = 10;

cl = cos(lambda*dtr); sl = sin(lambda*dtr);
cb = cos(phi*dtr); sb = sin(phi*dtr);

F = [ -sl    cl  0;
    -sb*cl -sb*sl cb;
    cb*cl  cb*sl sb];

m = size(A,1);
S = eye(m)-A*inv(A'*A)*A';
sd1 = sqrt((b'*b)/(m-4))
A0 = A(:,1:3);
M = F*inv(A0'*A0)*A0';

alpha = zeros(m,1);
for i = 1:m
   alpha(i,1) = sqrt((M(1,i)^2+M(2,i)^2)/diag(S(i,i)));
end