Abstract
Comb filters can be designed by replacing single delays in digital filters by multiple delays. These filters are “periodic” in the sense that their frequency response repeats itself at fixed intervals. They are thus well suited to a signal such as GPS L1 which has a spectrum made up of lines separated by the code repetition frequency of 1 kHz. In this paper we examine how periodic filters can be used in a conventional GPS L1 receiver. We find that comb filters assist with acquisition of weak signals, and can improve code-tracking performance.
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Arndt G, Stuber F, Panneton R (1973) Video-signal improvement using comb filtering techniques. IEEE Trans Commun 21(4):331–336
Coenen AJRM, Van Nee DJR (1992) Novel fast GPS/Glonass code-acquisition technique using low update rate FFT. Electron Lett 28(9):23 pp 863–865
George SF, Zamanakos (1951), Comb filters for pulsed radar use. In: Proceedings of IRE, vol 12, pp 1159–1165
Kaplan ED, Hegarty C (2006) Understanding GPS, 2nd edn. Artech House, Norwood
Lim Y (1986) Frequency-response masking approach for the synthesis of sharp linear phase digital filters. IEEE Trans Circuits Syst 33(4):357–364
North DO (1943) Analysis of factors which determine signal-noise discrimination in pulsed carrier systems, RCA report PTR-6C, Princeton
Pei SC, Tseng CC (1998) A Comb filter design using fractional-sample delay. IEEE Trans Circuits Syst 45(6):649–653
Shanmugam SK, Watson R, Nielsen J, Lachapelle G (2005) Differential signal processing schemes for enhanced GPS acquisition. In: Proceedings of ION-GNSS 2005, Long Beach, 13–16 September 2005, pp 212–222
Shanmugam SK, Nielsen J, Lachapelle G, Watson R (2006), Pre-correlation noise and interference suppression for use in direct-sequence spread spectrum systems with periodic PRN codes. In: Proceedings of ION-GNSS 2006, Fort Worth
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Dempster, A.G. Use of comb filters in GPS L1 receivers. GPS Solut 12, 179–185 (2008). https://doi.org/10.1007/s10291-007-0079-3
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DOI: https://doi.org/10.1007/s10291-007-0079-3