A DPS-4D digisonde has been installed to continuous monitoring of the overhead ionosphere and to strengthen ionospheric research. DPS-4D is a sweep frequency HF radar and works in the frequency range of 1-30 MHz. Radio wave is reflected from the ionosphere due to plasma frequency reflection and is also scattered from the ionospheric plasma irregularities. Digisonde observations can be used to get electron density profile and drifts in the ionosphere.