use of geodetic 2aer to calculate a satellite to ground receiver elevation angle

hi,

I'm trying to calculate elevation and azimuth angles of a satellite to ground receiver. I have the lla coordinates of satellite and recever. Now I'm confused to use [az, elev, slantRange] = geodetic2aer( ...lat, lon, h, lat0, lon0, h0, spheroid, angleUnit) whic one is lat and which one is lat0 and the others sameway. Can you help me?

lat_receiver= 39.99;%degree
lon_receiver= 32.8;%degree
height_receiver= 0;%meter

lat_geosat=   53.0;%degree
lon_geosat=  -26.9081;%degree
height_geosat=  2.0138e+07;%meter

Answer 1

[akshatsood]

Hi ysm,

I understand that you are facing issues while utilizing geodetic2aer function. As per the documentation page, it is defined as follows

[az,elev,slantRange] = geodetic2aer(lat,lon,h,lat0,lon0,h0,spheroid)

In reference to your code, lat0, lon0 and h0 correspond to lat_receiver, lon_receiver and height_receiver while lat, lon and h correspond to lat_geosat, lon_geosat and height_geosat. For identification of the parameters, I have positioned the receiver at the origin of the local AER system and transformed the geodetic coordinates of the satellite to the local azimuth-elevation-range (AER) spherical coordinates specified by az, elev, and slantRange. Here is the code snippet for your reference

spheroid = referenceEllipsoid('GRS 80'); % referenceEllipsoid object

[az,elev,slantRange] = geodetic2aer(lat_geosat,lon_geosat,height_geosat, ...
    lat_receiver,lon_receiver,height_receiver,spheroid)

Have a look at the below documentation page for better understanding

https://in.mathworks.com/help/map/ref/geodetic2aer.html?s_tid=doc_ta

I hope this helps.

[ysm ony]

Thank you.