Estimating the Occupancy of Ionospheric HF Channels for Operation of the Intermode Time-Frequency Dispersion Sensor with Minimum Power

Paper presents an algorithm for estimating the availability of 24 kHz channel by assessing the interference level based on spectral monitoring of the HF band to ensure the effective operation of the active time-frequency dispersion sensor. The effect of narrowband man-made interference rejection on the binary phase shift keying (BPSK) sensor signal was analyzed. Study addressed the energy losses of the BPSK signal with a bandwidth of 24 kHz due to rejection of 3 kHz interferences in its spectrum. There are presented the features of spectral monitoring algorithm in the HF range that provides detection of narrowband interferences, estimation of the availability of channels for efficient sensor operation, as well as experimental verification of the developed algorithms.