function plotmnoise
el=5:5:90;
sigz=0.01;
gut('newfigg','','',[600,400]);
ggt('newaxes','',[0.09,0.1,0.82,0.8],'xlim',[0,90],'ylim',[0,0.1]);
hold on, sig=[]; s={};
for fact=0:0.1:1
    sig=[sig;sqrt(sigz.^2*(1+fact*(1./sin(el*pi/180).^2-1)))];
    s={s{:},sprintf('factor=%.1f',fact)};
end
h=plot(el,sig); legend(h,s);
xlabel('Elevation Angle (deg)'); ylabel('Meas Noise (m)');
title('Measurement Noise Model')
