GEOPoint can also calculate polarisation tilt angles, eirp and frequency stability, antenna G/T estimate dates and times of annual sun-outage events, and estimate path-loss and rain-attenuation based on ITU-R climate models. As used by Hausfeld Consulting for satellite communications planning.

GEOPoint is an easy to use satellite antenna pointing calculator, for geostationary communications satellites. It calculates the azimuth and elevation pointing angles from a given location on the earth towards a specified geostationary satellite. The program also calculates polarisation tilt angles, estimates dates and times of annual sun-outage events, calculates antenna G/T, eirp and frequency stability, and estimates path-loss and rain-attenuation based on ITU-R climate models. As used by Hausfeld Consulting for satellite communications planning.

Basic Features (Free)

an easy to use dialog-style user interface for data entry and calculation;
entry of earth station location coordinates directly, or by clicking on a world map;
select earth station location from a built-in list of world major cities;
display of satellite elevation contours on the world map to aid in site selection;
entry of latitude and longitude coordinates in d,m,s format, or as decimal degrees;
calculation of pointing angles to a specified satellite for common types of antenna mount;
display of azimuth pointing angles relative to True North, and relative to local magnetic north;
estimation of antenna movement limits for inclined orbit satellites;
calculation of polarisation tilt angle, loop-back path delay, and required antenna tracking speeds;
estimation of the peak dates and times for sun-interference on the receive link.
Output of a summary report in HTML format.

Advanced Features (requires Registration)

ability to zoom the world map one level for more accurate site selection;
ability to save the current map image to file.
estimation of site altitude from ITU-R world topography model;
select earth station location from a user supplied file containing a list of sites;
view and save a diagram of the GEO Arc visible from the site;
labelling of individual satellites and plotting local horizon and antenna movement limits;
plotting of satellite locations from Norad two-line element or Intelsat ephemeris format orbit data;
display of ITU-R Climate Model data for the specified earth station location;
estimate antenna G/T from user inputs of antenna parameters and frequency;
calculate path loss between the earth station and satellite at a specified frequency using ITU-R propagation models;
estimate the impact of satellite motion on EIRP and frequency stability;
output a batch report of pointing angles from the site, for a list of user selected satellites;
output a detailed report of sun interference dates and times for given receive antenna parameters;
output a detailed report of rain attenuation loss for a range of frequencies and link availability;
output a batch summary report for a list of earth station sites.

New Release
Basic features (free):
· Converted Help files to new format, to improve compatibility with Windows 7.

Advanced features (requires registration):
· Satellite longitudes on GEO Arc plot are now labelled with 'E' or 'W' for clarity, and user can choose whether to label quot;0E to 360Equot; or quot;180W to 180Equot;.

Bug Fixes:
· fixed bug where ITU Altitude tool caused program crash.
· fixed bug where couldn't tab between items on main window.
· fixed bug where Sun Reports show earth station altitude in kilometres instead of metres.
[ GEOPoint release history ]

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