نتایج جستجو برای: gps band

تعداد نتایج: 165781  

Journal: :IEEE Trans. Geoscience and Remote Sensing 2001
Theodore L. Beach Paul M. Kintner

Besides their intended use in radionavigation, global positioning system (GPS) satellite signals provide convenient radio beacons for ionospheric studies. Among other propagation phenomena, the ionosphere affects GPS signal propagation through amplitude scintillations that develop after radio waves propagate through ionospheric electron density irregularities. This paper outlines the design, te...

2005
Hsing-Chung Chang H. C. Chang

The underground water extraction induced subsidence has the characteristics of slow rate, less predictable location and coverage. Over a long time period, the cumulated subsidence can be up to a few metres. This paper demonstrates the feasibility and capability of using conventional two-pass differential interferometric synthetic aperture radar (DInSAR) for monitoring the underground water extr...

2003
Abdulqadir Alaqeeli Janusz A. Starzyk Frank van Graas

Current GPS receivers spend much time in base-band processing performing acquisition and tracking. This is due to the large number of required operations in the software-based signal processing. This paper presents a novel signal acquisition and tracking method that reduces the number of operations, simplifies hardware implementation and decreases the acquisition time. The implementation of thi...

1999
P. T. Capozza B. J. Holland T. M. Hopkinson C. Li D. Moulin P. Pacheco R. Rifkin

Narrowband and partial-band interference can severely degrade the performance of GPS receivers. The use of digital signal processing in a receiver has been shown to provide protection against this type of interference in communications systems and has been proposed for application in future GPS systems. This paper discusses the measured effects of narrowband interference suppression on GPS rece...

2005
Tsung-Yu Chiou

Radio frequency interference (RFI) has been a perplexing problem, affecting the navigation quality of the Global Positioning System (GPS). The presence of the RFI, or even hostile jamming, will reduce the effective received signal power, and thus degrade navigation accuracy, continuity, and integrity of the system. A proposed next generation aircraft navigation system for the U.S. military call...

1996
C. J. Naudet

This article reports on a method of extracting tropospheric turbulence statistics from the Global Positioning System (GPS) Flinn database. The elevation and site dependence of the GPS residuals are shown to agree with the expectations of troposphere delay fluctuations. The GPS residuals are shown to have temporal statistics that are consistent with the assumed turbulence model. The turbulence p...

2009
Faisal A. Khan Chris Rizos Andrew G. Dempster

Classically difficult positioning environments often call for augmentation technology to assist the GPS, or more generally the Global Navigation Satellite System (GNSS) technology. The “Locata” ground-based ranging technology offers augmentation, and even replacement, to GPS in such environments. However, like any other system relying on wireless technology, a Locata positioning network also fa...

2007

This article investigates the basic theory of software-based receivers for L1-band civilian GPS applications, including a discussion of signal acquisition and tracking, and the need for bit synchronization in the receiver. Also included is a brief description of an L1-band GPS receiver, the MAX2741, which serves as a compact and inexpensive RF front-end for the receiver. A similar article appea...

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