The purpose of the present paper is to describe the observations of the variations in the
parameters of HF radio waves propagating through the ionosphere when the action of the …

We acquired measurements of four observable parameters of refracted signals received
from the ionosphere (Doppler shift, Doppler spectrum, number of rays, and signal amplitude) …

We have acquired HF Doppler measurements and studied the dynamics of the ionosphere
in the∼ 100–300 km altitude range during the 1–10 September 2019 period of typhoon …

During emergency events, we could significantly depend on the stable operation of radio
communication, navigation, and radars. The ionosphere, especially its auroral regions …

Back at the end of the last century, LF Chernogor validated the concept that geospace
storms are comprised of synergistically coupled magnetic storms, ionospheric storms …

This paper deals with the variations in the Doppler spectra and in the relative amplitudes of
the signals observed at oblique incidence over the People's Republic of China (PRC) during …

Doppler measurements at oblique propagation paths from the city of Harbin, the People's
Republic of China (PRC), to 10 high-frequency (HF) radio broadcast stations in the PRC …

Rapid and accurate ambiguity resolution is the core of high-precision precise point
positioning (PPP) data processing. However, the ambiguity parameters in PPP observation …

The time-varying biases within carrier phase observations are integrated into satellite clock
offset parameters for precise clock estimation. Consequently, when the precise satellite …

Abstract The Harbin Engineering University HF software-defined radio system since 2018
continuously monitors dynamic processes launched in the ionosphere by energetic events …