GPS multipath mitigation during code tracking

Laxton, M.C.; DeVilbiss, S.L.

doi:10.1109/acc.1997.610680

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…Afterwards, the enhanced strobe correlator has been proposed and adopted to mitigate both code and carrier-phase errors and decrease the error to 24 meters, which is about 0.08 chip [11]. Laxton and DeVilbiss [12] also employed a modified rake DLL (MRDLL) technique to estimate the LOS signal along with those of all multipath components. Even though the MRDLL reduces the code-phase error in DLL and the carrier-phase error in PLL, it would take a large number of correlators for estimation and consume a great deal of hardware resources.…”

Section: Background and Motivationmentioning

confidence: 99%

An Adaptive Multipath Mitigation Filter for GNSS Applications

Chang

Juang

2008

EURASIP J. Adv. Signal Process.

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Global navigation satellite system (GNSS) is designed to serve both civilian and military applications. However, the GNSS performance suffers from several errors, such as ionosphere delay, troposphere delay, ephemeris error, and receiver noise and multipath. Among these errors, the multipath is one of the most unpredictable error sources in high-accuracy navigation. This paper applies a modified adaptive filter to reduce code and carrier multipath errors in GPS. The filter employs a tap-delay line with an Adaline network to estimate the direction and the delayed-signal parameters. Then, the multipath effect is mitigated by subtracting the estimated multipath effects from the processed correlation function. The hardware complexity of the method is also compared with other existing methods. Simulation results show that the proposed method using field data has a significant reduction in multipath error especially in short-delay multipath scenarios.

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Section: Background and Motivationmentioning

confidence: 99%

An Adaptive Multipath Mitigation Filter for GNSS Applications

Chang

Juang

2008

EURASIP J. Adv. Signal Process.

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“…However, this technique is valid to only 25 satellites from the total of 32 navigation satellites [9]. Others techniques as MP Estimating DLL (MEDLL) [10] and the Modified Rake DLL (MRDLL) [11], which use statistics properties of the received signal to estimate the delay of LOS signal, are also proposed in the literature. They calculate the parameters of LOS and MP signals such as delays, amplitudes and phases.…”

Section: Introductionmentioning

confidence: 98%

GPS/Galileo Multipath Mitigation Using the First Side Peak of Double Delta Correlator

Rouabah

Chikouche

Bouttout

et al. 2010

Wireless Pers Commun

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In this paper, we propose an efficient scheme for the Line of Sight (LOS) delay estimation in satellite telecommunications. It aims to reduce errors caused by the Multipath (MP) fading channels in Global Navigation Satellite System (GNSS) such as Global Positioning System (GPS) and future Galileo. The scheme is based on the use of first side peaks of Double Delta Correlator (DDC) in combination with Savitzky-Golay Filter (SGF). The proposed scheme is called "Enhanced DDC (EDDC)". The DDC technique, like High Resolution Correlator (HRC) and Strobe Correlator (SC), uses the central peak of the Correlation Function (CF) for the LOS delay estimation. As a result, it enables to deal with the medium-delay MP. Yet, it presents a greater sensitivity to the noise and to the long-delay MP that we propose to mitigate, respectively, with the use of SGF and the measure of the first side peak (instead of the central). The obtained results show that our proposed scheme gives better performances over DDC scheme. In fact, it shows a significant error reduction caused by the presence of long-delay MP signals (up to 90%) compared to that of the DDC scheme.

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“…The first group relies on an estimation of parameters (delays, amplitudes, and phases) of the LOS signal along with all other multipath components. The representative techniques of this group are multipath estimating DLL , modified rake DLL , and fast iterative maximum likelihood algorithm . They achieve a significant performance improvement against multipath at the expense of a high complexity.…”

Section: Introductionmentioning

confidence: 99%

Unambiguous S-curve shaping technique for multipath mitigation in Global Navigation Satellite Systems alternative binary offset carrier signals

Chen

Jia

Yao

2012

Wirel. Commun. Mob. Comput.

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Global Navigation Satellite Systems positioning accuracy indoor and urban canyons environments are greatly affected by multipath because of distortions in its autocorrelation function. In this paper, we propose a new multipath mitigation technique based on the concept of S‐curve shaping for the new alternative binary offset carrier (AltBOC)‐modulated signals, which will most likely be used in both European Galileo system and Chinese Compass system. The definition of an optimum S‐curve is employed to reduce the false lock points and to improve the multipath mitigation capability via determining the shape of the local code tracking reference function. The structure of the proposed code tracking loop for AltBOC signals is quite simple and only requires one complex correlator. Results demonstrate that the proposed technique provides superior multipath mitigation performance compared with the conventional receiver correlation techniques and removes the ambiguity completely. Copyright © 2012 John Wiley & Sons, Ltd.

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GPS multipath mitigation during code tracking

Cited by 11 publications

References 4 publications

An Adaptive Multipath Mitigation Filter for GNSS Applications

An Adaptive Multipath Mitigation Filter for GNSS Applications

GPS/Galileo Multipath Mitigation Using the First Side Peak of Double Delta Correlator

Unambiguous S-curve shaping technique for multipath mitigation in Global Navigation Satellite Systems alternative binary offset carrier signals

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