Weighted DOP With Consideration on Elevation-Dependent Range Errors of GNSS Satellites

Won, Daehee; Ahn, Jiyun; Lee, Seung-Woo; Lee, Jiyun; Sung, Sangkyung; Park, Heung-Won; Park, Junpyo; Lee, Young Jae

doi:10.1109/tim.2012.2205512

Cited by 46 publications

(21 citation statements)

References 13 publications

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“…The WDOP was derived for the GNSS quality measure with the different weightings of each satellite . For the GNSS studies, the weightings are calculated based on the Signal to Noise Ratio (SNR) of the signals or the elevation angles of the satellite . Both cases improved the performance levels of the DOP with proper weightings.…”

Section: System Accuracymentioning

confidence: 99%

A Single Distance Measuring Equipment (DME) Station-Based Positioning System for Alternative Position Navigation and Timing (APNT)

Kim

Song

et al. 2015

J Inst Navig

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A single station-based positioning system, known as Mosaic/DME, is introduced. This new system has been designed for the Alternative PNT (APNT) solution to air services as it acts as a backup navigation system in case of GNSS outage. The Mosaic/DME is a single station consisting of conventional DME and multiple pseudolites. The DME is operated using two-way round signals for range measurements, with pseudolites broadcasting one-way continuous signals for carrier phase measurements. The receiver in the aircraft receives both signals and calculates its own position after the ambiguity resolution process. In this paper, the feasibility of this system is studied via two topics: the performance of the navigation accuracy and ambiguity resolution using the weighted dilution of precision and Monte Carlo simulations. The results conclude that this system satisfies the required navigation accuracy of the APNT and yields a very fast and easy ambiguity resolution.

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Section: System Accuracymentioning

confidence: 99%

A Single Distance Measuring Equipment (DME) Station-Based Positioning System for Alternative Position Navigation and Timing (APNT)

Kim

Song

et al. 2015

J Inst Navig

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“…However, because higher satellites produce more effective navigation solutions [15] a compensation (or weighting) process must be applied in addition to the proposed approach to improve the accuracy.…”

Section: Test Resultsmentioning

confidence: 99%

“…In general, the D satellite constellation design, performance evaluation, and the prediction of ex error levels. The DOP used in this method is derived from the error covariance from the least-squares estimation equation [4,15]. Applying the general definiti us equations (5) and (6).…”

Section: Optimal Performance Indexmentioning

confidence: 99%

Geometric Sensitivity Index for the GNSS Using Inner Products of Line of Sight Vectors

Won¹,

Ahn²,

Sung³

et al. 2015

International Journal of Aeronautical and Space Sciences

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Satellite selection and exclusion techniques have been applied to the global navigation satellite system (GNSS) with the aim of achieving a balance between navigational performance and computational efficiency. Conventional approaches to satellite selection based on the best dilution of precision (DOP) are excessively computational and complicated. This paper proposes a new method that applies a geometric sensitivity index of individual GNSS satellites. The sensitivity index is derived using the inner product of the line of sight (LOS) vector of each satellite. First, the LOS vector is computed, which accounts for the geometry between the satellite and user positions. Second, the inner product of each pair of LOS vectors is calculated, which indicates the proximities of the satellites to one another. The proximity can be determined according to the sensitivity of each satellite. A post-processing test was conducted to verify the reliability of the proposed method. The proposed index and the results of a conventional approach that measures the dilution of precision (DOP) were compared. The test results demonstrate that the proposed index produces results that are within 96% of those of the conventional approach and reduces the computational burden. This index can be utilized to estimate the sensitivity of individual satellites, obtaining a navigation solution. Therefore, the proposed index applies to satellite selection and exclusion as well as to the sensitivity analyses of multiple GNSS applications.

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“…Therefore, the DOP values are directly related to the estimation error covariance; hence, the more favorable the geometry, the lower the DOP values [13]. If the observation noise was not independent and identically distributed, the weighted DOP factors must be used [14].…”

Section: Problem Formulationmentioning

confidence: 99%

GNSS Vertical Dilution of Precision Reduction using Terrestrial Signals of Opportunity

Morales¹,

Khalife²,

Kassas³

2016

The International Technical Meeting of the the Institute of Navigation

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and an M.S.E. in Aerospace Engineering and a Ph.D. in Electrical and Computer Engineering from The University of Texas at Austin. From 2004 through 2010 he was a research and development engineer with the LabVIEW Control Design and Dynamical Systems Simulation Group at National Instruments Corp. His research interests include estimation, navigation, autonomous vehicles, and intelligent transportation systems.

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Weighted DOP With Consideration on Elevation-Dependent Range Errors of GNSS Satellites

Cited by 46 publications

References 13 publications

A Single Distance Measuring Equipment (DME) Station-Based Positioning System for Alternative Position Navigation and Timing (APNT)

A Single Distance Measuring Equipment (DME) Station-Based Positioning System for Alternative Position Navigation and Timing (APNT)

Geometric Sensitivity Index for the GNSS Using Inner Products of Line of Sight Vectors

GNSS Vertical Dilution of Precision Reduction using Terrestrial Signals of Opportunity

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