Performance of the GLONASS P-Code at Ll and L2 Frequencies

The transmission of satellite signals at two widely spaced frequencies allows correction of the ionospheric delay. Both GPS and GLONASS transmit such signals, and to date there have been no published dual frequency GLONASS studies. This paper shows the fundamental accuracy of the Leeds University multichannel GPS/GLONASS receiver. Details are then given of the processing methods that have been used to obtain the ionospheric group delay using GLONASS L1 and L2 P-code measurements. Examples of the measured delay are provided and compared with the GPS model. Navigation results are shown using the P-code phase at L1 only and with a combination of the L1 and L2 measurements. An analysis of the accuracy of the P-code pseudorange and navigation capability is presented.