Phase and amplitude measurements using AbsPAL receiver
A data logger for Absolute Phase and Amplitude measurements of fixed frequency transmitter signals passing over Indian longitudes through earth- ionosphere waveguide mode propagation has been installed at our center and continuous data collection at 3 frequencies of 19.8 kHz (NWC, Australia), 21.4 kHz (NPM, Hawaii) and 24 kHz (NAA, Cutler, Maine) has been in progress for the last one year. This experiment is expected to provide information over the ionospheric perturbation caused by earthquakes and energetic particle precipitation resulting from wave-particle interactions. A computer display of phase and amplitude of the 3 frequencies along with GPS frequency is shown in Figure.
A computer display of amplitude and phase records of three frequencies along with GPS