Tapan Misra, Director of Ahmedabad-based ISRO’s Space Applications Centre (SAC) stated that India was now using 100 per cent indigenous technology in building and launching of its space missions. So from now on to make even the support systems fully indigenous a Navigation System with Indian constellation will perform the role instead of relying on the American GPS receivers. The NavIC receiver has been developed by SAC and can receive signals from both IRNSS and GPS satellites.
Earlier dependent on GPS, now the Indian Space Research Organisation (ISRO) has taken a decision to replace US-owned GPS with NavIC (Navigation with Indian Constellation) in all future missions for Navigation, Guidance and Control (NGC). The NGC is the brain of the launch vehicle responsible for directing the propulsive forces and stabilising the vehicle along the desired path to achieve the orbit with the specified accuracy. It also defines the optimum trajectory in real time to reach the specified target and steer the vehicle along the predefined path and inject the spacecraft into the mission targeted orbit.
In December 2016, NavIC receiver was flight tested in ‘piggyback’ mode onboard PSLV C-36 mission and later for the first time given active role navigating PSLV C-38 that launched Cartosat-2 series satellite along with 30 other co-passenger satellites in June this year. The desi navigation technology has performed well giving ISRO scientists confidence to completely replace GPS with NavIC. Besides SAC has newly developed a miniaturised processor, which is smaller and powerful than the earlier processor.