Statistical properties of quadrature components of an ionospheric signal
Abstract
The quadrature components on the Van der Pol plane of a reflected ionospheric signal, modulated in amplitude and phase by the fluctuating ionospheric plasma, were recorded simultaneously along with the independently observed envelope. A single vertical probe signal (2.57.5 MHz) reflected from the F2layer was recorded. About 100 observations of duration 34 min were statistically analyzed to determine the autocorrelation coefficients, cross correlation coefficient, and standard deviation. The autocorrelation coefficients for the two quadrature components were equal to an accuracy exceeding statistical error. The cross correlation coefficients indicated that the two quadrature processes were uncorrelated at any moment of time. The variances were equal, indicating the uniformity of the phase distribution. The conclusion is that the two quadrature components in not less than 95% of the cases have the properties of Hilbert conjugate processes.
 Publication:

Moskovskii Universitet Vestnik Seriia Fizika Astronomiia
 Pub Date:
 December 1978
 Bibcode:
 1978MVSFA..19...81M
 Keywords:

 Ionospheric Propagation;
 Quadratures;
 Radio Probing;
 Signal Reflection;
 Correlation Coefficients;
 F 2 Region;
 Signal Processing;
 Statistical Analysis;
 Communications and Radar