The Multipath Estimating Delay Lock Loop

Nee, R.D.J. van

doi:10.1109/isssta.1992.665623

Cited by 119 publications

(60 citation statements)

References 5 publications

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“…4) Works well in any kind of multipath environment, specular or diffuse. The Enhanced Strobe correlator is quite simple and promising [1,8,9,10,11,12,13,14] .…”

Section: Resultsmentioning

confidence: 99%

“…Strobe correlator technology greatly reduces GPS multipath signals, which can occur when, reflected off tall buildings or other obstructions before reaching the receiver, increasing the distance a signal travels and reduces accuracy. A GPS receiver using strobe correlator performs a series of complex calculations to restore positioning accuracy [1,8,9,10,11,12,13,14].…”

Section: Strobe Correlatormentioning

confidence: 99%

“…Far multipath signals can be mostly eliminated by good correlator-based multipath mitigation techniques. In the following section, we will focus on the tremendous improvements from which the RTCM differential users and RTK users will benefit [1,8,9,10,11,12,13,14]. The reference point (511) was mounted on the clear part of the obstruction region (no trees) ( Figs.…”

Section: Enhanced Strobe Correlator (Esc)mentioning

confidence: 99%

“…However, in a strong and fast changing multipath environment, they do not completely eliminate the effects. The code tracking (Enhanced Strobe Correlator) can be improved by at least 40 % in the rover point (P1) [8,9,10,11,12,13,14]. …”

Section: Point 3 (P3) and Point 4 (P4)mentioning

confidence: 99%

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Multipath and multipath reduction in the obstructed areas by using enhanced strobe correlator (ESC) technique

Pirti

2015

Teh. vjesn.

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Preliminary notesDespite advances in GPS equipment installed at permanent sites, multipath still remains a significant error source. Strobe Correlator technology greatly reduces GPS multipath signals, which can occur when the GPS signals are reflected off tall buildings or other obstructions before captured by the receiver and, thus, increase the distance a signal travels and reduce the accuracy. A GPS receiver using Strobe Correlator performs a series of complex calculations to restore positioning accuracy. I present a technique for evaluating and correcting the multipath at GPS antenna by utilizing the Enhanced Strobe Correlator (ESC) especially in RTK GPS applications. The advanced technique of Enhanced Strobe Correlation is discussed here. In addition, the performance of the technique is presented with the experiments from real multipath environments comparing RTK GPS results with terrestrial ones. Keywords: accuracy; ESC performance; GPS; multipath Višestaznost i višestazna redukcija u ometanim područjima pomoću ESC tehnikePrethodno priopćenje Unatoč poboljšanja GPS opreme postavljene na trajnim mjestima, višestaznost i dalje ostaje značajan izvor grešaka. Tehnologija Strob Korelatora značajno smanjuje GPS višestazne signale koji se mogu pojaviti kad se GPS signali reflektiraju od visokih zgrada ili drugih zapreka prije nego ih prijemnik uhvati, i na taj način povećavaju udaljenost koju signal prelazi te smanjuju točnost. GPS prijemnik sa Strob Korelatorom obavlja niz složenih proračuna kako bi odredio točnost položaja. Ovdje prezentiram metodu za procjenjivanje i ispravljanje višestaznosti kod GPS antenna primjenom Poboljšanog Strob Korelatora (ESC) naročito u RTK GPS aplikacijama. Ovdje se raspravlja o unaprijeđenoj tehnici i performansama ESC, uz eksperimente u stvarnom višestaznom opruženju i usporedbu RTK GPS rezultata i onih na zemlji.

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“…4) Works well in any kind of multipath environment, specular or diffuse. The Enhanced Strobe correlator is quite simple and promising [1,8,9,10,11,12,13,14] .…”

Section: Resultsmentioning

confidence: 99%

Section: Strobe Correlatormentioning

confidence: 99%

Section: Enhanced Strobe Correlator (Esc)mentioning

confidence: 99%

Section: Point 3 (P3) and Point 4 (P4)mentioning

confidence: 99%

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Multipath and multipath reduction in the obstructed areas by using enhanced strobe correlator (ESC) technique

Pirti

2015

Teh. vjesn.

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“…A technique applicable to phase measurement was introduced by [ VAN NEE, 1992 [BRODIN, 2001]. The main problem of using multiple correlators occurs for short delay multipath, where algorithms fail to process the de-convolution of direct and reflected signals.…”

Section: -Phase Correlationmentioning

confidence: 99%

Assessment and improvement of the capabilities of a window correlator to model GPS multipath phase errors

Betaille

Cross

Euler³

2006

IEEE Trans. Aerosp. Electron. Syst.

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This thesis is concerned with the modelling of Global Positioning System (GPS) phase multipath. GPS is increasingly used for very high precision (centimetre level) engineering surveying applications such as setting out on construction sites and the control of major civil engineering plant (e.g. bulldozers, graders and pavement layers). In such applications the phase of the carrier signal is the basic observable and the dominant error source is multipath (electromagnetic reflections of the carrier waves from surfaces in the surroundings of the antennas). The work contained in the thesis has been carried out in collaboration with the LCPC (Laboratoire Central des Ponts et Chaussées) in Nantes, France, which made available its test facility and Leica Geosystems, Heerbrugg, Switzerland, a GPS manufacturer, which funded the work and which made available modified equipment for testing.The specific subject of the research is the assessment and improvement of the capabilities of a Phase Multipath Mitigation Window correlator (PMMW) to model GPS multipath phase errors. The phase window correlator is a new sampling technique dedicated to the estimation of multipath errors in phase measurements. The thesis contains background material on GPS multipath mitigation and on several existing patents related to

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An adaptive multipath estimation/elimination technique for GPS signals reception

Minami¹,

Morikawa²,

Aoyama³

et al. 2002

Electron. Comm. Jpn. Pt. I

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SUMMARYRecently, with advances in differential GPS (DGPS) technology, the measurement performance of GPS has improved significantly. In this environment, degradation of the measurement performance of GPS due to multipath error that cannot be eliminated by the DGPS technique is a serious problem. In this paper, as a multipath solution in GPS, multipath estimation is carried out with an adaptive filter based on the least squares method. A method is presented to reduce the locking error in code phase locking and carrier phase locking by eliminating the multipath effect from the received signal correlation. Also, by means of computer simulation, the effectiveness of the present method is confirmed.

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The Multipath Estimating Delay Lock Loop

Cited by 119 publications

References 5 publications

Multipath and multipath reduction in the obstructed areas by using enhanced strobe correlator (ESC) technique

Multipath and multipath reduction in the obstructed areas by using enhanced strobe correlator (ESC) technique

Assessment and improvement of the capabilities of a window correlator to model GPS multipath phase errors

An adaptive multipath estimation/elimination technique for GPS signals reception

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