|The radio communication and Space Physics group at NPL has been continuously engaged in characterizing and updating our knowledge of the Radio Environment (Tropospheric and Ionospheric Media) over India and around.
There are primarily two reasons for advancing the state of ar in propagation research: firstly, the explosion in sophisticated electronic system hardware with zero failure rate has made the medium uncertainty as the only limiting factor in attaining super high performances. Secondly, the high data transmission rates, abetted by advanced systems and necessitated by economics of spectrum management require a much more accurate prediction of radio climatology than available currently.
As per the needs of different users, especially defence services, in the area of better radio communication and navigations in the country, NPL has developed several Ionospheric prediction models. The starting point in developing ionospheric prediction models is to make long-term solar activity predictions, because ionospheric parameters are essentially controlled by varying solar activity.
RWC - NPL has developed its own techniques for long term solar activity predictions. The relationship between the sunspot numbers (R12) and foF2/TEC is usually not linear and it is advisable to fit second degree curves for different local times and latitudes and generate a set of constants for the Indian zone. Such constants have been used for developing different Ionospheric Prediction Models.