Absolute calibration of NavIC reference receiver

Abstract

The NavIC (or IRNSS) reference receiver's measurement data is the basis for the generation of orbital parameters of the NavIC satellites. For ensuring accurate orbit determination, the various sources of error in ground segment need to be precisely measured and compensated. The RF/IF delays of the NavIC reference receiver are derived from its absolute calibration. The achieved accuracy level is better than 1ns. In this paper, we also present the impact of Doppler collision on the calibration process of receiver.