Effect of Doppler Collision in Satellite navigation systems

Navigation with Indian Constellation (NavIC or IRNSS) is the Indian regional satellite navigation system. The constellation consists of 7 GSO satellites. Doppler Collision is a specific characteristic experienced by the receiver when the difference between the carrier doppler frequencies of the two satellite signals is within the code tracking loop bandwidth of the receiver [1], [2]. Although this situation is not too frequent in MEO based GNSS, it happens quite frequently in NavIC (especially GEO satellites) and SBAS satellites given their apparent stationary nature [4]. This paper provides the details of experiment simulated to study the effect of Doppler collision in estimated user position using NavIC satellites.