Modified quadratic shepard and radial basis functions interpolations for determination of orthometric heights from global positioning system (GPS) heights

2011 ◽  
Vol 6 (36) ◽  
Author(s):  
Leyla Cakir
Keyword(s):  
Radial Basis Functions ◽  
Global Positioning System ◽  
Basis Functions ◽  
Positioning System ◽  
Global Positioning ◽  
Radial Basis ◽  
Orthometric Heights

scholarly journals The determination of the geoid-spheroid separation for GPS levelling and applications

1989 ◽  
Vol 20 (2) ◽  
pp. 185
Author(s):  
A.W.H. Kearsley ◽  
R.M. Eckels
Keyword(s):  
Global Positioning System ◽  
Geoid Height ◽  
Satellite Observations ◽  
Positioning System ◽  
Reference Surface ◽  
Global Positioning ◽  
Orthometric Heights ◽  
Gps System

The heights which are obtained from global positioning system (GPS) satellite observations are measured with respect to an earth-centred ellipsoid and are not, as a result, generally useful for surveying and engineering. In order to become useful they must be transformed into orthometric heights, that is, heights which are measured with respect to the actual level reference surface termed the geoid. The parameter which enables this transformation is N, the geoid height or geoid-ellipsoid separation.This paper reviews the capabilities of the GPS system for height measurements, describes the various methods used to evaluate N from gravimetry, and explores the suitability of these methods in the various applications in which height measurements from the GPS may be used.

scholarly journals Radial Basis Functions Intended to Determine the Upper Bound of Absolute Dynamic Error at the Output of Voltage-Mode Accelerometers

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4154 ◽  
Author(s):  
Krzysztof Tomczyk ◽  
Marcin Piekarczyk ◽  
Grzegorz Sokal
Keyword(s):  
Mathematical Model ◽  
Radial Basis Functions ◽  
Upper Bound ◽  
Dynamic Error ◽  
Basis Functions ◽  
Voltage Mode ◽  
Radial Basis ◽  
Operational Frequency ◽  
Mc Method

In this paper, we propose using the radial basis functions (RBF) to determine the upper bound of absolute dynamic error (UAE) at the output of a voltage-mode accelerometer. Such functions can be obtained as a result of approximating the error values determined for the assumed-in-advance parameter variability associated with the mathematical model of an accelerometer. This approximation was carried out using the radial basis function neural network (RBF-NN) procedure for a given number of the radial neurons. The Monte Carlo (MC) method was also applied to determine the related error when considering the uncertainties associated with the parameters of an accelerometer mathematical model. The upper bound of absolute dynamic error can be a quality ratio for comparing the errors produced by different types of voltage-mode accelerometers that have the same operational frequency bandwidth. Determination of the RBFs was performed by applying the Python-related scientific packages, while the calculations related both to the UAE and the MC method were carried out using the MathCad program. Application of the RBFs represent a new approach for determining the UAE. These functions allow for the easy and quick determination of the value of such errors.

scholarly journals Precise determination of Earth's center of mass using measurements from the global positioning system

1992 ◽  
Vol 19 (14) ◽  
pp. 1487-1490 ◽  
Author(s):  
Yvonne Vigue ◽  
Stephen M. Lichten ◽  
Geoffrey Blewitt ◽  
Michael B. Heflin ◽  
Rajendra P. Malla
Keyword(s):  
Global Positioning System ◽  
Center Of Mass ◽  
Precise Determination ◽  
Positioning System ◽  
Global Positioning

Determination of global positioning system (GPS) receiver clock errors: impact on positioning accuracy

2009 ◽  
Vol 20 (7) ◽  
pp. 075105 ◽  
Author(s):  
Ta-Kang Yeh ◽  
Cheinway Hwang ◽  
Guochang Xu ◽  
Chuan-Sheng Wang ◽  
Chien-Chih Lee
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Gps Receiver ◽  
Positioning Accuracy ◽  
Global Positioning ◽  
Receiver Clock

Assessment of the Power Potentials of Ofu Stream for Mini Hydroelectric Development

2013 ◽  
Vol 824 ◽  
pp. 129-137
Author(s):  
R.E. Ochagwuba ◽  
Samuel O. Igbinovia
Keyword(s):  
Environmental Impact ◽  
Global Positioning System ◽  
Economic Transformation ◽  
Energy Resources ◽  
Positioning System ◽  
Hydroelectric Development ◽  
Global Positioning ◽  
Analytical Assessment ◽  
Flow Power

Analytical assessment of the water energy resources in Ofu stream segments at Ofokopi, as one of the hydrologic regions of Kogi state, Nigeria was carried out. The principal focus was on the determination of the stream segments parameters of head, flow, power potentials and Environmental Impact Assessment (EIA). Two appropriate sites in close cascade were identified namely, Ofu I and Ofu II. Garmin GPSMAP 76S global positioning system was used to determine the gross hydraulic heads which gave 11.84 m and 8.60 m respectively. Power potentials of magnitude of 330 kW and 118.8 kW and annual energy generation of 2,890.80 MWhr and 1,040.69 MWhr respectively were estimated. The results of the EIA study yield negligible impact on the locality. The estimated power being in the mini hydroelectric schemes category, the identified sites could be developed to provide electric power for socio-economic transformation of the rural area.

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