Khalil Sultan

Using the data suggested in the initial comment of this m-file I received results different from the suggested results:

location.longitude = -105.1786;
location.latitude = 39.742476;
location.altitude = 1830.14;
time.year = 2003;
time.month = 10;
time.day = 17;
time.hour = 12;
time.min = 30;
time.sec = 30;
time.UTC = -7;

sun = sun_position(time, location);
%
% sun =
%
% zenith: 50.1080438859849
% azimuth: 194.341174010338

RESULTS SEEN HERE:

>> sun
sun =
     zenith: 50.107627161847546
    azimuth: 1.943412241230940e+002

I am using MATLAB vs. 7.6.0.324 (R2008a). I wonder if there is anyone who has seen a comparable discrepancy and if/how this was resolved.

Regards

Great Job - very detailed! I just want to mention something that seems a bit confusing. You state that the steady state error is zero in response to a unit step input, but the output is 0.35 rather than 1. The open loop transfer function is a type zero, which would not be able to render a zero steady state error in response to a step input. I was able to calculate a steady state error of 0.65, which leads to the output of 0.35. I'm certainly not an expert, and might be analyzing this incorrectly, but wanted to make note of it since the paper seems so complete otherwise.

Thanks for this good work. It was very useful for me. I used this information in preparing my postgraduate paper. This paper was about parameter estimation of a PMDC motor.