Tracking Measurements From a Miniature GLONASS Receiver

Oliver Leisten, Geraint Ffoulkes-Jones, Gerald Whitworth, and David Belton

Abstract:	The structure of a GLONASS LI receiver, that is related to and derived from Navstar Systems integrated GPS chipset has previously been presented . (‘1 This chipset was designed to primarily work within the GPS system but with the capability to convert to GLONASS operation as the use of the dual standard receiver architectures was anticipated. A relatively compact and capable GLONASS LI receiver has been implemented and from this some tracking measurements which demonstrate promising performance are presented. The receiver utilises the 20 MHz master oscillator of the XR5 GPS instrument in a receiver synthesiser system that achieves phase noise advantage by means of a dual stage Aff,, = 0.5 MHz and derived AfLa = 0.0625 MHz local oscillator systems. The GLONASS receiver shares the device structure of its XR5 GPS parent except for the addition of a single synthesiser chip. The code tracking, carrier frequency tracking and hopefully ultimately carrier code tracking, together with data recovery is carried out in the standard NAVSTAR SYSTEMS designed multi-channel D.S.P. device. A fast sequencing GLONASS receiver is housed in a box 6.75 inch x 3 inch x 2.5 inch in size. The D.S.P device is capable of simultaneously processing GPS and GLONASS inputs. Recent tracking measurements have demonstrated approximately 5 metres peak to peak pseudorange rate noise. This implies that our prototype instrument should be capable of unaided position fixing accuracy that is significantly better than the 100m CEP level that is provided by S/A degraded GPS.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	853 - 859
Cite this article:	Leisten, Oliver, Ffoulkes-Jones, Geraint, Whitworth, Gerald, Belton, David, "Tracking Measurements From a Miniature GLONASS Receiver," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 853-859.
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