Satellite Tracking

Tracking a satellite

Tracking a satellite

Online real-time satellite tracking:
• N2YO

Online orbital predictions

Free PC satellite tracking Apps include:
• Gpredict
• Orbitron

Free mobile satellite tracking Apps include:
• iOS iPhone/iPad Satellite Explorer Pro
• Windows Satellite Explorer
• Android AmsatDroid Free

Keplerian elements (‘Keps’) provide a mathematical description of a Satellite’s orbit. Satellite tracking software reads the Keplerian elements and provides graphical and/or tabular orbital predictions. Keplerian data are most commonly provided in the AMSAT and the Space Command / NASA Two-Line Element (TLE) format. You can also use the “kep-char” Excel spreadsheet to determine orbital characteristics of a set of Keplerian elements.

The North American Aerospace Defence Command (NORAD) Two-Line Element Set Format

Keplerian Two Line Elements (TLEs) ‘Keps’:
• New satellites launched in past 30 days
• CubeSats
• Experimental satellites
• Engineering satellites
• Amateur radio satellites

Adding new satellites to SatPC32, Gpredict and Nova

A directional satellite tracking antenna can be made using just a small Yagi and a TV antenna rotator. Bob Bruninga WB4APR suggests fixing the Yagi to point 15 degrees above the horizon to produce good results for both satellite and terrestrial working. Read Bob’s article at

Doppler Shift

Bringing the One True Rule of Doppler Tuning into the 21st Century

The One True Rule for Doppler Tuning 1994

Application of Amateur Radio in Geophysics: Calculation of a Satellite’s Orbital Velocity from Doppler Frequency Shift by Dr. Carol F. Milazzo, KP4MD

Satellite Doppler Spreadsheet

NASA Orbital Lifetime Software