scholarly journals 57. Feasibility of the Global Positioning Satellite System for Rural Aeromedical Transport

1996 ◽  
Vol 11 (S2) ◽  
pp. S44-S44
Author(s):  
Russell F. Pruitt ◽  
Ronald F. Sing ◽  
C. W. Austin ◽  
W. Joseph Messick
Keyword(s):  
Rural Areas ◽  
Current System ◽  
Prospective Trial ◽  
Satellite System ◽  
Ease Of Use ◽  
Gps Receivers ◽  
Global Positioning ◽  
Level I ◽  
Aeromedical Transport ◽  
Gps System

Aeromedical navigation to the scene of an accident using navigational assistance computer mapping software (NACM) can be difficult in rural areas due to the lack of topographic landmarks. In these instances, navigation is made easier using the Global Positioning Satellite (GPS) system to determine latitude and longitude.Purpose: To determine the reliability and feasibility of portable GPS receivers compared with our current system of NACM (MAP EXPERT®) in the navigation of aeromedical transport flights.Design: A non-randomized prospective trial comparing flights using either GPS or NACM. Setting: Flight program at a Level I trauma center.Methods: GPS receivers (for transmitting location) were carried by half the helicopters and ground EMS units. The NACM system was used to transmit the location of the accident to the other flights. Data on flight time, distance, and accident location were collected. Pilots and EMS personnel using the portable GPS system completed a questionnaire regarding accuracy, reliability, and ease of use.Results: This study included 51 flights; GPS (n = 26) and NACM (n = 25). There was no difference in the miles flown per minute in the NACM group (1.69 miles/minute) compared with the GPS group (1.70 miles/minute). Pilots and EMS personnel rated the GPS reliable, accurate, and easy to use for navigation.

Augmentation Systems

2011 ◽  
pp. 283-293
Author(s):  
Mohammad S. Sharawi
Keyword(s):  
Performance Metrics ◽  
Satellite System ◽  
Space Vehicles ◽  
Gps Receivers ◽  
Commercial Use ◽  
Global Positioning ◽  
Almost All ◽  
Gps System ◽  
Year 2000 ◽  
Route Navigation

The global positioning satellite system (GPS) has been utilized for commercial use after the year 2000. Since then, GPS receivers have been integrated for accurate positing of ground as well as space vehicles. Almost all aircrafts nowadays rely on GPS based system for their take off, landing, and en-route navigation. Relying on GPS alone does note provide the meter level accuracy needed to guarantee safe operation of aircrafts. Thus several augmentation systems have been deployed worldwide to enhance the accuracy of the GPS system. Several augmentation systems that serve local as well as wide coverage areas are discussed in this chapter, specifically the LAAS system, the WAAS system as well as the EGNOS system. The architecture as well the performance metrics for each of these augmentation systems are presented and discussed.

scholarly journals Modified WiFi-RSS Fingerprint Technique to locate Indoors-Smartphones: FENG building at Koya University as a case study

2017 ◽  
Vol 2 (3) ◽  
pp. 212-217 ◽  
Author(s):  
Halgurd S. Maghdid ◽  
Ladeh Sardar Abdulrahman ◽  
Mohammed H. Ahmed ◽  
Azhin Tahir Sabir
Keyword(s):  
Global Positioning System ◽  
High Performance ◽  
Low Cost ◽  
Satellite System ◽  
Positioning System ◽  
Global Positioning ◽  
Accurate Position ◽  
Global Navigation Satellite ◽  
Gps System

Positioning system used for different purposes and different services, many researches are going on to find a more accurate position with low error within high performance. There are many localization solutions with different architectures, configurations, accuracies and reliabilities for both outdoors and indoors. For example, Global Navigation Satellite System (GNSS) technology has been used for outdoors.  Global Positioning System (GPS) is one of the most common outdoors tracking solutions in the world, for outdoors, however, when indoors; it could not be accurately tracked users by using a GPS system. This is because, when users enters into indoors the GPS signals will no longer available due to blocked by the roof of buildings and it is no longer considered as a viable option.  WiFi Positioning System (WPS) can be used as an alternative solution to define users’ position, especially when GPS signal is not available. Further, WPS is a low cost solution, because there is no need to deploying WiFi Access Points (WAPs) in the vicinity, as they are installed to access the Internet. In this paper, specifically, WiFi-RSS Fingerprinting technique is used to locate smartphones using WAPs signals with a modified calculation. The new modified calculation is to dynamic weighting of the WAPs RSS values based on the real-live indoors structure. The achieved positioning accuracy, based on several trial experiments, is up to 6 meters via the implemented algorithm in the MALTAB.

Experimental Application of Global Positioning system To Locate Motor Vehicle Crashes: Impact on Time and Accuracy

1998 ◽  
Vol 1625 (1) ◽  
pp. 41-49 ◽  
Author(s):  
John S. Miller ◽  
Duane Karr
Keyword(s):  
Global Positioning System ◽  
Human Error ◽  
Motor Vehicle ◽  
Motor Vehicle Crash ◽  
Positioning System ◽  
Gps Receivers ◽  
Crash Data ◽  
Vehicle Crash ◽  
Global Positioning ◽  
Conventional Methods

Motor vehicle crash countermeasures often are selected after an extensive data analysis of the crash history of a roadway segment. The value of this analysis depends on the accuracy or precision with which the crash itself is located. yet this crash location only is as accurate as the estimate of the police officer. Global Positioning System (GPS) technology may have the potential to increase data accuracy and decrease the time spent to record crash locations. Over 10 months, 32 motor vehicle crash locations were determined by using both conventional methods and hand-held GPS receivers, and the timeliness and precision of the methods were compared. Local crash data analysts were asked how the improved precision affected their consideration of potential crash countermeasures with regard to five crashes selected from the sample. On average, measuring a crash location by using GPS receivers added up to 10 extra minutes, depending on the definition of the crash location, the technology employed, and how that technology was applied. The average difference between conventional methods of measuring the crash location and either GPS or a wheel ranged from 5 m (16 ft) to 39 m (130 ft), depending on how one defined the crash location. Although there are instances in which improved precision will affect the evaluation of crash countermeasures, survey respondents and the literature suggest that problems with conventional crash location methods often arise from human error, not a lack of precision inherent in the technology employed.

Financial Innovations and Performance of Commercial Banks in Kenya

2020 ◽  
Vol 2 (2) ◽  
pp. 21-33
Author(s):  
Naomi Wanja Ireri ◽  
Gladys Kimutai
Keyword(s):  
Rural Areas ◽  
Commercial Banks ◽  
Internet Banking ◽  
Ease Of Use ◽  
Primary Data ◽  
The Internet ◽  
Mobile Banking ◽  
Good Opportunity ◽  
Financial Innovations ◽  
Automated Teller Machine

Commercial banks in Kenya have embraced alternative banking channels which represent a shift in delivery of banking and financial services since the alternative banking have become synonymous with commercial banks in Kenya. While banks have succeeded in leveraging available technology and provide alternative avenues to customers for banking services, the challenge it faces today is optimizing the usage of these channels so as to improve on their performance. The general objective of this study was to investigate the effects of financial innovations on the performance of commercial banks in Kenya. The specific objectives of the study were to examine the influence of internet banking, mobile banking, agency banking and ATM banking on the performance of commercial banks in Kenya. The study was guided by agency theory, balanced score card and diffusion of innovation theory. This study employed a descriptive research design. The study targeted44 commercial banks in Kenya as at 2017. The 16 banks which embrace all the four financial innovations from 2013 to 2017were selected using purposive sampling method. The sample size was 80 respondents who comprised of 5 senior management employees in each of the selected banks.This study used questionnaire to collect primary data from the respondents. Content analysis technique was used to analyze qualitative data collected from open ended questions in and reported in narrative form. Descriptive statistics such as mean and standard deviation were used to analyse the quantitative data. Multiple regression analysis was used to show the relationship between independent variables against dependent variable. The study revealed that internet banking, mobile banking, agency banking and ATM banking had a positive and significant effect on the performance of commercial banks. Thisstudy concludes that the banking industry has benefited tremendously from the development of the Internet. The Internet fundamentally changed the way in which banking networks are designed to meet the client demands and expectations. Mobile banking provides a good opportunity to commercial banks in Kenya to reach many mobile phone subscribers in Kenya who had remained unbanked and unreached due to limited access to bank branch networks in the country. The access to the large masses through mobile banking of the population gives banks the opportunity to grow by reaching the unbanked population. Agency banking has led to accessibility of financial service to many customer in remote areas and hence an increase in effectiveness and efficiency in service delivery. Customers are satisfied with the automated teller machine services because of ease of use, transaction cost and service security but not satisfy with automated teller machine dispense of cash. The study recommends that the public and businesses must be encouraged to use Internet banking in their daily activities, including deposits, payments and money transfers. Commercial banks in Kenya should ensure convenience and security of mobile banking through written guidelines on convenience and security of mobile banking. Commercial banks in Kenya should increase the number of agents in estates and in the rural areas. This can be done by reducing the requirements of becoming a bank agent. The banks should employ customized software that records relevant information on automated teller machine cards so that banks can establish whether unauthorized transaction has taken place or not.

Consistency analysis of global positioning system position errors with typical statistical distributions

2021 ◽  
pp. 1-18
Author(s):  
Mariusz Specht
Keyword(s):  
Normal Distribution ◽  
Global Positioning System ◽  
Position Error ◽  
Statistical Distribution ◽  
Positioning System ◽  
Statistical Distributions ◽  
Position Errors ◽  
Global Positioning ◽  
Gps System ◽  
Best Fit

Abstract Research into statistical distributions of φ, λ and two-dimensional (2D) position errors of the global positioning system (GPS) enables the evaluation of its accuracy. Based on this, the navigation applications in which the positioning system can be used are determined. However, studies of GPS accuracy indicate that the empirical φ and λ errors deviate from the typical normal distribution, significantly affecting the statistical distribution of 2D position errors. Therefore, determining the actual statistical distributions of position errors (1D and 2D) is decisive for the precision of calculating the actual accuracy of the GPS system. In this paper, based on two measurement sessions (900,000 and 237,000 fixes), the distributions of GPS position error statistics in both 1D and 2D space are analysed. Statistical distribution measures are determined using statistical tests, the hypothesis on the normal distribution of φ and λ errors is verified, and the consistency of GPS position errors with commonly used statistical distributions is assessed together with finding the best fit. Research has shown that φ and λ errors for the GPS system are normally distributed. It is proven that φ and λ errors are more concentrated around the central value than in a typical normal distribution (positive kurtosis) with a low value of asymmetry. Moreover, φ errors are clearly more concentrated than λ errors. This results in larger standard deviation values for φ errors than λ errors. The differences in both values were 25–39%. Regarding the 2D position error, it should be noted that the value of twice the distance root mean square (2DRMS) is about 10–14% greater than the value of R95. In addition, studies show that statistical distributions such as beta, gamma, lognormal and Weibull are the best fit for 2D position errors in the GPS system.

scholarly journals Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

2018 ◽  
Vol 10 (11) ◽  
pp. 1679 ◽  
Author(s):  
Jean-François Crétaux ◽  
Muriel Bergé-Nguyen ◽  
Stephane Calmant ◽  
Nurzat Jamangulova ◽  
Rysbek Satylkanov ◽  
...  
Keyword(s):  
Satellite System ◽  
Reference Points ◽  
Absolute Calibration ◽  
In Situ Data ◽  
Absolute Bias ◽  
Weather Stations ◽  
Field Campaigns ◽  
The Absolute ◽  
Gps System ◽  
Water Height

Calibration/Validation (C/V) studies using sites in the oceans have a long history and protocols are well established. Over lakes, C/V allows addressing problems such as the performance of the various retracking algorithms and evaluating the accuracy of the geophysical corrections for continental waters. This is achievable when measurements of specific and numerous field campaigns and a ground permanent network of level gauges and weather stations are processed. C/V consists of installation of permanent sites (weather stations, limnigraphs, and GPS reference points) and the organization of regular field campaigns. The lake Issykkul serves as permanent site of C/V, for a multi-mission purpose. The objective of this paper is to calculate the altimeter biases of Jason-3 and Sentinel-3A, both belonging to an operational satellite system which is used for the long-term monitoring of lake level variations. We have also determined the accuracy of the altimeters of these two satellites, through a comparison analysis with in situ data. In 2016 and 2017, three campaigns have been organized over this lake in order to estimate the absolute bias of the nadir altimeter onboard the Jason-3 and Sentinel-3A. The fieldwork consisted of measuring water height using a GPS system, carried on a boat, along the track of the altimeter satellite across the lake. It was performed at the time of the pass of the altimeter. Absolute altimeter biases were calculated by averaging the water height differences along the pass of the satellite (GPS from the boat system versus altimetry). Jason-3 operates in a Low Resolution Mode (LRM), while the Sentinel-3A operates in Synthetic Aperture Radar (SAR) mode. In this study we found that the absolute biases measured for Jason-3 were −28 ± 40 mm with the Ocean retracker and 206 ± 30 mm with the Ice-1 retracker. The biases for Sentinel-3A were −14 ± 20 mm with the Samosa (Ocean like) retracker and 285 ± 20 mm with the OCOG (Ice-1-like) retracker. We have also evaluated the accuracy of these two altimeters over Lake Issykkul which reached to 3 cm, for both the instruments, using the Ocean retracker.

scholarly journals Global Positioning System (GPS) Accuracies in Eastern U.S. Deciduous and Conifer Forests

1996 ◽  
Vol 20 (2) ◽  
pp. 81-84 ◽  
Author(s):  
Christopher J. Deckert ◽  
Paul V. Bolstad
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Conifer Forests ◽  
Forest Canopies ◽  
Gps Receivers ◽  
Global Positioning ◽  
Corrected Data

Abstract This study determined horizontal positional errors when using C/A code GPS receivers under forest canopies and in varied terrain. Positional errors were evaluated for a total of 18 sites: three sites for each of six combinations of canopy (conifer, hardwood) and terrain (ridge, slope, valley). Ten replicates were collected at each site for each of 60, 200, and 500 position fixes. Differentially corrected positional accuracies from conifer sites averaged 18.4 ft, which was significantly greater than the 14.5 ft observed for hardwood sites. For differentially corrected data, positional errors generally increased from ridgetop to valley positions. - Errors decreased when the number of position fixes was increased. South. J. Appl. For. 20(2):81-84.

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