Aperture Jitter Effects in Software Radio GNSS Receivers

Andrew Dempster

School of Surveying and Spatial Information Systems, University of New South Wales, Sydney 2052.

DOI:                 

Abstract

Increasingly, software radio techniques are being used in the implementation of communications receivers in general, and GNSS receivers in particular. In such a receiver, the received signal is sampled as close to the receive antenna as possible, and all subsequent processing uses digital signal processing (DSP) techniques. The sampling clock will suffer from phase noise instabilities, leading to a phenomenon known as aperture jitter. This paper examines the effects of aperture jitter for a number of “typical” software radio GNSS receivers. A jitter specification is derived which restricts the noisy effects due to jitter to 10dB below thermal noise. It transpires that regardless of the new signals that are selected to accompany it, it is the L1 signal that drives this jitter specification.

Keywords

Software radio, GNSS receiver, aperture jitter.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Akos, D M, and J B Y Tsui (1996), Design and Implementation of a Digital Digitization GPS Receiver Front End, IEEE Trans Microwave Theory and Techniques, vol 44, no 12, Dec 1996
[2]	Akos, Dennis M, et al (1999), Direct Bandpass Sampling of Multiple Distinct RF Signals, IEEE Trans Communications, vol 47, n0 7, July 1999, pp983-988
[3]	Awad, Selim Saad (1998), Analysis of Accumulated Timing-Jitter in the Time Domain, IEEE Trans Instrumentationand Measurement, vol 47, no 1, Feb 1998, pp69-73
[4]	Da Dalt, Nicola, et al (2002), On the Jitter Requirements of the Sampling Clock for Analogue-to-Digital Converters, IEEE Trans Circuits and Systems I, vol 49, no 9, Sep 2002, pp1354-1360
[5]	Fontana, R D, et al (2001), The Modernized L2 Civil Signal, GPS World, Sep 1, 2001
[6]	GPSW (2004), GPS and Galileo Reach Signal Agreement, Global View, GPS World, Mar 2004, pp12-13
[7]	GPSW (2004A), EC: GPS-Galileo Deal Has Mutual Benefits, Global View, GPS World, Apr 2004, p 13
[8]	Hein, G, et al (2002), Status of Galileo Frequency and Signal Design, Proc ION-GPS 2002
[9]	Hein, G, et al (2003), Galileo Frequency and Signal Design, GPS World, June 2003, pp30-37
[10]	ICD-GPS-705 (2002), Interface Control Document: Navstar GPS Space Segment/ Navigation L5 User Interfaces, US DOD, 29 Mar 2002
[11]	ICD-GPS-200C (2003), Interface Control Document: Navstar GPS Space Segment/ Navigation User Interfaces, US DOD, IRN-200C-005R1, 14 Jan 2003
[12]	Kobayashi, Haruo, et al (1999), Aperture Jitter Effects in Wideband ADC Systems, Proc ICECS '99, vol 3 ,5-8 Sept. 1999 pp1705-1708
[13]	Ledvina, B.M., M.L. Psiaki (2003), S.P. Powell, and P.M. Kintner, A 12-Channel Real-Time GPS L1 Software Receiver, Proc. ION NTM, Jan 22-24, 2003. Anaheim, CA
[14]	Lee, J, et al (2003), 10 Gsample/s optoelectronic A/D converter, Electronics Letters, vol 39, no 23, 13 Nov 2003
[15]	MTT-S International , vol 3, 20-25 May 2001, pp2139 –2142
[16]	Poulton, K, et al (2003), A 20GS/s 8b ADC with a 1MB Memory in 0.18μm CMOS, Proc Int Solid-State Circ Conf, 2003, IEEE
[17]	Ries, L, et al (2002), A Software Receiver for GPS-IIF L5 Signal, Proc ION-GPS 2002, Sep 2002, pp1540-1553
[18]	RTCA SC-159 (2000), DO-261 Navstar GPS L5 Signal Specification, 14 Dec 2000,
[19]	Sheingold, Daniel H, (ed) (1986), “Analog-Digital Conversion Handbook, 3rd ed., Prentice Hall, 1986
[20]	Shinagawa, Mitsuru, et al (1990), Jitter Analysis of High-Speed Sampling Systems, IEEE J of Solid State Circuits, vol 25, no 1, Feb 1990, pp220-224
[21]	Sun, Yi-Ran, and Svante Signell (2004), Effects of Noise and Jitter on algorithms for Bandpass Sampling in Radio Receivers, Proc. ISCAS 2004, IEEE, Vancouver, Canada, 2004, pp I-761 – I-764
[22]	Thor, Jonas, and Dennis M Akos (2002), A Direct RF Sampling Multifrequency GPS Receiver, Proc Position
[23]	Location and Navigation Symposium, 2002 IEEE, 15-18 April 2002 pp44-51
[24]	Van Dierendonck, A J, (2000), The New L5 Civil GPS Signal, GPS World, Sept 2000, pp64-71
[25]	Vaugan, Rodney G et al (1991), The Theory of Bandpass Sampling, IEEE Trans Signal Processing, vol 39, no 9, Sept 1991, pp1973-1984