Noncoherent Code Discriminator Gains for Global Navigation Satellite System Signal Tracking

Noncoherent Code Discriminator Gains for Global Navigation Satellite System Signal Tracking

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Many common discriminators used for code tracking of global navigation satellite system (GNSS) signals are ratios of quadratic forms of the correlation outputs.Here south park fitted hat we derive a general expression for the gain of this type of discriminator and show that it depends on the effective copyright-to-noise ratio.We then evaluate this expression for several different code discriminators and GNSS signals, including GPS C/A-code, P-code, L1C, and M-code, Galileo E1 OS, GLONASS L1OF and L2OF, and BeiDou B1I and B2I.We also 193x737acg01 determine how noise and interference saturate the discriminator (i.e.

, make its output less sensitive to changes in the input) and the resulting effect on loop bandwidth.The discriminator gains described in this paper compensate for the saturation and ensure that loop bandwidth and code tracking performance can be accurately predicted and controlled over a critical range of effective copyright-to-noise ratios.