This is a guess: The SWR is the Standing Wave Ratio between the impedance of the feedline to an (amateur radio) antenna and the impedance presented by the antenna. A perfect match sees a 1:1 ratio. My guess is that this is some kind of modeling software that reads an external impedance and uses capacitor values stored in EEPROM to construct a filter of some kind and keeps adjusting them until the SWR is minimized. It appears that A0 inputs the frequency while A1 and A2 supply the two impedances. Because the filter is often constructed from a capacitor and a coil, my guess is that the code jockeys the tap on a coil to change the inductance for a given capacitor. Since my Russian is a bit lacking (e.g., zero), all of this is a guess.