Results 81 to 90 of about 89,960 (192)

Data-driven Variable Speed Limit Design for Highways via Distributionally Robust Optimization

open access: yes, 2018
This paper introduces an optimization problem (P) and a solution strategy to design variable-speed-limit controls for a highway that is subject to traffic congestion and uncertain vehicle arrival and departure.
Fooladivanda, Dariush   +2 more
core   +1 more source

Doppler Tolerance, Complementary Code Sets and the Generalized Thue-Morse Sequence [PDF]

open access: yes, 2014
We generalize the construction of Doppler-tolerant Golay complementary waveforms by Pezeshki-Calderbank-Moran-Howard to complementary code sets having more than two codes.
Coxson, Greg E., Nguyen, Hieu D.
core   +2 more sources

Integer ambiguity validation in GNSS positioning

open access: yes, 2015
Carrier phase observations are required for high accuracy positioning with Global Navigation Satellite Systems (GNSS). This requires that the correct number of whole carrier cycles in each observation (integer ambiguity) is determined. The existing methods have been shown to perform differently depending on the observables. Subsequently, the ratio test
Feng, S, Jokinen, A
openaire   +2 more sources

Ambiguity-Resolved Model Tests for Carrier-Phase GNSS

open access: yesApplied Sciences
Although the theory of mixed-integer inference is well developed for GNSS parameter estimation, such is not yet the case for the validation and monitoring of mixed-integer GNSS carrier-phase models.
Peter J. G. Teunissen
doaj   +1 more source

Lie polynomials in an algebra defined by a linearly twisted commutation relation

open access: yes, 2018
We present an elementary approach in characterizing Lie polynomials in the generators $A,B$ of an algebra with a defining relation that is in the form of a deformed or twisted commutation relation $AB=\sigma(BA)$ where the deformation or twisting map ...
Cantuba, Rafael Reno S.
core  

Integer ambiguity validation through machine learning for precise point positioning

open access: yesSatellite Navigation
The discrimination test of ambiguity resolution, also known as ambiguity validation, is a vital procedure to quantify the reliability of Global Navigation Satellite System (GNSS) ambiguity-fixed solutions. Several well-known tests, including the R-ratio,
Jiang Guo, Jianghui Geng
doaj   +1 more source

A novel stop-and-go kinematic positioning method for PPP–RTK

open access: yesGeo-spatial Information Science
The technology of precise point positioning – real time kinematic (PPP – RTK) can realize regional accurate positioning. However, poor quality atmospheric corrections can greatly impact the integer ambiguity resolution.
Siyao Wang, Rui Tu, Ju Hong, Xiaochun Lu
doaj   +1 more source

Unambiguous acquisition algorithm based on sub‐correlation functions combination for semi‐integer CPM signals

open access: yesElectronics Letters
Due to the nonlinear nature of continuous phase modulation (CPM), most existing unambiguous acquisition algorithms are ineffective in eliminating the ambiguity threat faced by semi‐integer CPM signals.
Mingming Xie, Rui Xue
doaj   +1 more source

Overview of development and challenges of attitude determination for rotary wing UAVs based on GNSS

open access: yesFrontiers in Physics
Attitude determination of rotary-wing unmanned aerial vehicles (RUAVs) is crucial for grasping their motion state and is a necessary condition to ensure the correct execution of flight missions.
Yejia Zeng   +9 more
doaj   +1 more source

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