A note on correlation distance of vhf fading from irregularities in the equatorial ionosphere
Tests using satellite signals at 136 MHz have been conducted at NASA STADAN (Satellite Tracking and Data Acquisition Network) in Santiago, Chile, and the spatial correlation coefficient for an equatorial ionospheric disturbance has been computed. Test data were obtained on telemetry antennas separated from east to west by 1168 feet. The polarization correlation of the signal (horizontal and vertical) at one antenna is shown to be high (0.68) The correlation for the 1168-foot spacing is shown to be low (0.2). Other data from Minitrack interferometer measurements are also included.