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Table 5 Parameters derived from the SA FCA

From: MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Symbol Parameter Description
V a Apparent velocity The velocity of the ground diffraction pattern over the spaced antennas calculated from the time delays of the cross-correlation function determined between pairs of antennas.
V t True velocity The velocity of the ground diffraction pattern over the spaced antennas calculated from the time delays of the cross-correlation function determined from pairs of antennas corrected for random changes in the pattern in time and for any pattern anisotropy. Additional quality control parameters are also applied to obtain this parameter (see Table 6).
w a Apparent vertical velocity Vertical velocity measured from the phase of the complex autocorrelation function measured on each antenna uncorrected for angle of arrival
w cor Corrected vertical velocity Vertical velocity corrected for effects of off-zenith mean angle of arrival
AOA Mean angle of arrival Mean angle of arrival
τ 0.5 Fading time Mean auto-correlation function half-width
T 0.5 Pattern lifetime Fading time in the frame of the ground diffraction pattern
S 0.5 Pattern scale Major axis of the characteristic ellipse
R ax Axial ratio Ratio of the major to minor axes of the characteristic ellipse
\( \theta \) ax Axial rotation Direction of major axis of characteristic ellipse
PTD Percentage time discrepancy Ratio of sum of cross-correlation function maximum delay times to sum of absolute cross-correlation function delay times
SNR Signal to noise ratio The signal to noise ratios for each receiver channel
P Received power The received power for each receiver channel