Abstract:
MATLAB-Simulink is useful tool to analysis the signal processing part of GNSS receiver.
Carrier tracking loop (CTL) used in GNSS receiver are closed loop systems, designed
from their continuous time transfer function. In this thesis GNSS signals are generated
in Simulink by Binary o set Carrier (BOC) and Binary Phase Shift Keying (BPSK)
modulation. GNSS signal comprises of PRN code, C/A code, navigation bits and high
frequency carrier signal. Transmitted signal is received at GNSS receiver front end
down converted to Intermediate frequency (IF) . Digital IF signal is correlated with
locally generated code replica, signals are feed into carrier tracking loop each and every
information of tracked signal is automatic upgraded by feedback loop lter. In proposed
work low C/N0 signals tracked accurately and results are validating the proposed work.
Tracking error and jitter is an important parameter to show the tracking performance
of Carrier tracking loop. Tracking jitter behavior with low C/N0 GNSS signals has been
studied. Hence large variation in input frequency of GNSS signal could be estimated
for bi-phase signal of GNSS receiver. Simulation studies demonstrates the suitability of
the carrier tracking loop of GNSS receiver. Simulation results are validate the proposed
model.
