Compensation of Group Delay Differences in the GNSS Receiver Front End

Fabio Pisoni and Philip G. Mattos

Abstract:	The GLONASS signal has a total bandwidth of 8MHz, divided into 14 FDM channels. Spectral components that are far in frequency experience differences in the total group delay response. The main contributors to the group delay variations are the external analog components like the SAW filter and the RF front-end analog blocks. The delay spread over the GLONASS frequencies can be of the order of several nanoseconds inducing a channel dependent error in the pseudorange. Similarly, the sidelobes of Galileo E1 Open Service (OS) Signal are separated by some MHz and the effects of non-linearity in the phase response must be verified. In general, when wideband signals are concerned, group delay differences must be accurately estimated and possibly compensated to avoid accuracy degradation.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	942 - 946
Cite this article:	Pisoni, Fabio, Mattos, Philip G., "Compensation of Group Delay Differences in the GNSS Receiver Front End," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 942-946.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In