Planetary Radar Astronomy

Antenna gain Ratio of an antenna s sensitivity in the direction toward which it is pointed to its average sensitivity in all directions. 

Circular polarization ratio Ratio of echo power received in the same sense of circular polarization as transmitted (the SC sense) to that received in the opposite (OC) sense. 

Doppler shift Difference between the frequencies of the radar echo and the transmission, caused by the relative velocity of the target with respect to the radar. 

Echo bandwidth Dispersion in Doppler frequency of an echo, that is, the width of the echo power spectrum. 

Ephemeris Table of planetary positions as a function of time (plural ephemerides). 

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Butrica, A. J. (1996). To See the Unseen A History of Planetary Radar Astronomy, NASA History Series No. SP-4218. NASA, Houston. 

Ostro, S. J. (1993). Planetary radar astronomy, Rev. Modem Physics 65, 1235-1279. 

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