Enhancement of the international spectrum monitoring system following accession of the Russian federation

It is considered how capabilities of the International spectrum monitoring system (ISMS) of the International Telecommunication Union in the HF frequency range (3 - 30 MHz) are enhanced due to accession of the Russian Federation that took place in the beginning of 2010. Coverage areas by direction finding and location by triangulation were numerically calculated and compared in application to a section of the ISMS located in the Euro-Asian region without the Russian, and with the Russian stations. It is shown, that the operation of the Russian stations within the ISMS provides well-marked expansion of direction finding and location coverage areas, elimination of uncovered zones within overall areas covered by location, and considerable decreasing of location uncertainties at variation of dead zone radiuses, caused by the ionospheric radio propagation, over a wide range up to values exceeding half of coverage area radiuses.