Abstract
For single frequency navigation receiver, there are various techniques to estimate the ionospheric delay. Klobuchar model is a standard technique for single frequency signal that is used to estimate the ionospheric delay globally. It uses two sets of ionospheric coefficients, namely, alpha and beta, to compute the ionospheric delay. There are two different ionospheric model coefficients for IRNSS and GPS. This paper compares the estimation of ionospheric delay using single frequency (two sets of ionospheric model coefficients) and dual frequency signals. The dual frequency estimation is used to validate the results due to Klobuchar model. The ionospheric delays due to GPS ionospheric coefficients are found more suitable than the delays due to IRNSS ionospheric coefficients.
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