Abstract
This thesis develops a combined GPS L1, L2C and L5 KF based tracking loop by
exploiting the dispersive nature of the ionosphere and signal structure of the
GPS signals. This results in a robust tracking loop suitable for a scintillation
monitoring receiver. It also incorporates an adaptive algorithm that has
adaptive bandwidth depending on scintillation level. Performance of combined
KF based tracking algorithm compared with that of single frequency KF based
tracking algorithm for both adaptive and non-adaptive cases are analysed and
compared.
A semi-analytic model is used to analyze the effect of scintillation on the
tracking loop to perform faster and provide a reliable platform for analyzing the
scintillation effects on the receiver performance. Results obtained from
simulation data and real data show better performance for the adaptive multifrequency
KF based tracking loop than that of the single frequency KF based
tracking loop and the non-adaptive KF tracking loop.
