Journal articles: 'GPS accuracy'

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Jefferies, J. J. "GPS Accuracy Limitations." Photogrammetric Record 13, no. 75 (August 26, 2006): 482. http://dx.doi.org/10.1111/j.1477-9730.1990.tb00707.x.

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Komarovskiy, Yuriy A. "GPS RECEIVER’S ACCURACY DEGRADATION NEAR TALL OBJECTS." Scholarly Notes of Komsomolsk-na-Amure State Technical University 1, no. 12 (December 30, 2012): 28–35. http://dx.doi.org/10.17084/2012.iv-1(12).5.

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BROWN, KENNETH, WILLIAM MATHON, ARTHUR DORSEY, and MARGARET LAREZOS. "Dynamic Uploading for GPS Accuracy*." Navigation 45, no. 1 (March 1998): 17–30. http://dx.doi.org/10.1002/j.2161-4296.1998.tb02368.x.

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Gao, Yang, James F. McLellan, and Mohamed A. Abousalem. "Single-Point GPS Positioning Accuracy Using Precise GPS Data." Australian Surveyor 42, no. 4 (December 1997): 185–92. http://dx.doi.org/10.1080/00050345.1997.10558707.

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Gordeev, V. A., and O. S. Raeva. "Preliminary estimation of the accuracy of GPS-schemes project." izvestiya vysshikh uchebnykh zavedenii gornyi zhurnal 7 (November 9, 2017): 57–62. http://dx.doi.org/10.21440/0536-1028-2017-7-57-62.

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Lass, Lawrence W., and Robert H. Callihan. "GPS and GIS for Weed Surveys and Management." Weed Technology 7, no. 1 (March 1993): 249–54. http://dx.doi.org/10.1017/s0890037x00037222.

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Global positioning systems (GPS) technology, developed by the Department of Defense, enable accurate documentation of Cartesian coordinates anywhere on the earth's surface. Surveying, mapping, positioning, and subsequent management of weed infestations can be expedited with this technology. Positions and boundaries of infestation may be located with 10-m or better accuracy while the GPS receiver is continuously moving, and with 2-m or better accuracy with brief stops for repeated sampling. GPS data agreed closely with U.S. Geological Survey data. Coordinates for a weed infestation may be relocated for treatment, evaluation or other purposes. Basic geographic information systems (GIS) map features from Digital Line Graph (DLG), Topologically Integrated Encoding and Reference Systems (TIGER) and other sources of information may be used to fully integrate delimiting survey results from GPS readings in order to develop weed management plans.

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Ma, Lihua, and Shangli Zhou. "Positional Accuracy of Gps Satellite Almanac." Artificial Satellites 49, no. 4 (December 1, 2014): 225–31. http://dx.doi.org/10.2478/arsa-2014-0017.

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ABSTRACT How to accelerate signal acquisition and shorten starting time are key problems in the Global Positioning System (GPS). GPS satellite almanac plays an important role in signal reception period. Almanac accuracy directly affects the speed of GPS signal acquisition, the start time of the receiver, and even the system performance to some extent. Combined with precise ephemeris products released by the International GNSS Service (IGS), the authors analyse GPS satellite almanac from the first day to the third day in the 1805th GPS week (from August 11 to 13, 2014 in the Gregorian calendar). The results show that mean of position errors in three-dimensional coordinate system varies from about 1 kilometer to 3 kilometers, which can satisfy the needs of common users.

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Zaigraeva, Anna, and Leonid Zaigraev. "The Accuracy Assessment of GPS-positioning in Geobotanic Research." Chornomorski Botanical Journal 4, no. 2 (October 1, 2008): 273–76. http://dx.doi.org/10.14255/2308-9628/08.42/15.

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Berber, Mustafa, Aydin Ustun, and Mevlut Yetkin. "Comparison of accuracy of GPS techniques." Measurement 45, no. 7 (August 2012): 1742–46. http://dx.doi.org/10.1016/j.measurement.2012.04.010.

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KITANO, Isamu, and Keiji SUZUKI. "Research of Accuracy on Indoor GPS." Proceedings of the JSME annual meeting 2004.5 (2004): 293–94. http://dx.doi.org/10.1299/jsmemecjo.2004.5.0_293.

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TATEISHI, Ryutaro, and You KUROSAWA. "Accuracy of point positioning using GPS." Journal of the Japan society of photogrammetry and remote sensing 36, no. 6 (1997): 63–71. http://dx.doi.org/10.4287/jsprs.36.6_63.

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Grace, J. "GPS guidance system increases projectile accuracy." IEEE Aerospace and Electronic Systems Magazine 15, no. 6 (June 2000): 15–17. http://dx.doi.org/10.1109/62.847926.

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Schutz, B. E., B. D. Tapley, P. A. M. Abusali, and C. S. Ho. "Accuracy assessment of GPS satellite orbits." Advances in Space Research 11, no. 6 (January 1991): 189–92. http://dx.doi.org/10.1016/0273-1177(91)90252-f.

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Shi, Hong, and Dong Hai Qiao. "Experimental Study on Accuracy of GPS Positioning." Applied Mechanics and Materials 263-266 (December 2012): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.346.

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Geophysical measurement relies on the positioning accuracy of GPS (global positioning system). Usually the positioning accuracy is area dependent. This paper uses a commercially available GPS receiver to verify its positioning accuracy with practical measurement in a small area. With a measurement setup in an open ground, the results show that even for the fixed point, the GPS measured positioning error of about 0.234 meter could be observed for a period of time. Of 12 GPS measured distance errors, only one is about 5.7 meters, all others are within the range of 3-5 meters of GPS receiver specification.

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Xu, Tian Lai. "INS/GPS Integrated Navigation Method Based on Neural Network." Advanced Materials Research 712-715 (June 2013): 2419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.2419.

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Inertial Navigation System (INS) and Global Positioning System (GPS) are commonly integrated to overcomes each systems inadequacies and provide an accurate navigation solution. However, the positioning accuracy deteriorates with time in the absence of GPS signals. This paper proposed an artificial neural network aided INS/GPS integrated navigation method to bridge the GPS outages. In this method, the neural network was trained to model the error of INS when GPS was available. INS velocity and attitude error were got by implementing the neural network when GPS outages occurred. Simulations in INS/GPS integrated navigation showed improvement in positioning accuracy for GPS outages.

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Larner, A. J. "Mini-Addenbrooke's Cognitive Examination: a pragmatic diagnostic accuracy study." International Journal of Geriatric Psychiatry 30, no. 5 (April 8, 2015): 547–48. http://dx.doi.org/10.1002/gps.4258.

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صباح حسين علي, صباح حسين علي. "Study of the Effect of the Geometrical Correction of the Satellite Image on the Global Positioning System Tracking by Using Geographical Information System." journal of King Abdulaziz University Engineering Sciences 23, no. 2 (February 21, 2012): 173–87. http://dx.doi.org/10.4197/eng.23-2.9.

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The use of Global Positioning System (GPS) for geometrical correction (rectification) of the satellite imagery aims to establish the relation between the image coordinate system and the GPS readout coordinate system. By using this technique, the errors existing within satellite image can be calibrated and reduced as well. This paper introduces application of Geographical Information System (GIS) and image processing software in addition to GPS for measuring the coordinates of waypoints to be as ground control points (GCPs) for the geometrical correction process of the QuickBird satellite image for the adopted study area (Mosul City). For comparison purpose, the geodetic rectification process was also done for the adopted QuickBird satellite image with respect to the IKONOS imagery. Due to the low standards in the geometric design characteristics of the road which badly affected the GPS measurements, the output results show that the geodetic rectification of the QuickBird imagery with respect to IKONOS satellite image gives more accuracy of results than GCP acquired by GPS. The overall procedure applied in the present study shows the ability to give an improvement in the positional accuracy of an already georeferenced coordinate system of the QuickBird image which in turn gives a higher accuracy of the GPS tracking path for the purpose of mapping, urban planning, cartography, survey and other GIS applications .

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Akarsu, V., D. U. Sanli, and E. Arslan. "Accuracy of velocities from repeated GPS measurements." Natural Hazards and Earth System Sciences 15, no. 4 (April 21, 2015): 875–84. http://dx.doi.org/10.5194/nhess-15-875-2015.

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Abstract. Today repeated GPS measurements are still in use, because we cannot always employ GPS permanent stations due to a variety of limitations. One area of study that uses velocities/deformation rates from repeated GPS measurements is the monitoring of crustal motion. This paper discusses the quality of the velocities derived using repeated GPS measurements for the aim of monitoring crustal motion. From a global network of International GNSS Service (IGS) stations, we processed GPS measurements repeated monthly and annually spanning nearly 15 years and estimated GPS velocities for GPS baseline components latitude, longitude and ellipsoidal height. We used web-based GIPSY for the processing. Assuming true deformation rates can only be determined from the solutions of 24 h observation sessions, we evaluated the accuracy of the deformation rates from 8 and 12 h sessions. We used statistical hypothesis testing to assess the velocities derived from short observation sessions. In addition, as an alternative control method we checked the accuracy of GPS solutions from short observation sessions against those of 24 h sessions referring to statistical criteria that measure the accuracy of regression models. Results indicate that the velocities of the vertical component are completely affected when repeated GPS measurements are used. The results also reveal that only about 30% of the 8 h solutions and about 40% of 12 h solutions for the horizontal coordinates are acceptable for velocity estimation. The situation is much worse for the vertical component in which none of the solutions from campaign measurements are acceptable for obtaining reliable deformation rates.

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Niu, Zhi Hong, Meng Bo Song, and Ji Qin Chen. "Comparative Study on GPS Height Fitting Models Based on Kriging Estimation." Applied Mechanics and Materials 170-173 (May 2012): 2999–3008. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2999.

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Currently, the study on GPS height determination is mainly focused on changing GPS geodetic height into normal height by applying to mathematical models to fit a quasi-geoid and calculate the height anomaly value with high degree of accuracy. This paper illustrates the basic principles of Kriging Method GPS Height Fitting, Kriging Method GPS Height Fitting Based on Polynomial Surface, and Kriging Method GPS Height Fitting Based on Wavelet Analysis, and carries out a comparative experimental study by using the measured data of GPS control network. The results show that the fitting accuracy of the collective model based on Kriging Method is better than that obtained only through a single Kriging Method, and the GPS height fitting accuracy obtained through Kriging Method Based on Wavelet Analysis is the most accurate.

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Jia, Rui Xi, Xiao Yu Li, Chang Feng Xia, and Dong Yang Jin. "Broadcast Ephemeris Accuracy Analysis for GPS Based on Precise Ephemeris." Applied Mechanics and Materials 602-605 (August 2014): 3667–70. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.3667.

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The accuracy of broadcast ephemeris is an important index of a satellite navigation system. The theory and method of precise ephemeris assessing broadcast ephemeris are introduced. The accuracy of GPS satellite broadcast ephemeris is assessed with the precise ones provided by IGS. The orbital coordinates of GPS broadcast ephemeris from 18th to 24th October 2013 are calculated. The analysis shows that during this time the GPS satellite broadcast ephemeris is reliable, accurate and safe as the whole, meanwhile the broadcast ephemeris accuracy is about 1 meter, better than nominal accuracy of 5 meters.

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Latimer, Sharon, Jayne Hewitt, Trudy Teasdale, Carl de Wet, and Brigid M. Gillespie. "The accuracy, completeness and timeliness of discharge medication information and implementing medication reconciliation: A cross-sectional survey of general practitioners." Australian Journal of General Practice 49, no. 12 (December 1, 2020): 854–58. http://dx.doi.org/10.31128/ajgp-04-20-5375.

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Background and objectives General practitioners (GPs) require accurate medication information to care for recently discharged hospital patients. Pre-discharge medication reconciliation improves the accuracy of patient medication lists that GPs receive. This study aimed to explore GPs’ perceptions of the accuracy, completeness and timeliness of hospital discharge medication information, and how they undertake medication reconciliation. Methods Using a cross-sectional online survey, quantitative and qualitative data were collected from a convenience sample of GPs practising across the Gold Coast, Australia. Data were analysed using descriptive statistics and content analysis. Results Twelve GPs were recruited. Patient hospital discharge medication information was mostly accurate and complete, but delays in receiving this information affected the ability of GPs to undertake medication reconciliation. Discussion Receiving accurate and timely patient discharge medication information can reduce errors. Optimising the communication of medication information to GPs may improve patient safety.

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CHIO, SHIH-HONG. "VBS RTK GPS-ASSISTED SELF-CALIBRATION BUNDLE ADJUSTMENT FOR AERIAL TRIANGULATION OF FIXED-WING UAS IMAGES FOR UPDATING TOPOGRAPHIC MAPS." Boletim de Ciências Geodésicas 22, no. 4 (December 2016): 665–84. http://dx.doi.org/10.1590/s1982-21702016000400038.

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Unmanned Aircraft Systems (UASs) can collect high resolution and high quality images for local mapping. If the highly accurate GPS flying trajectory of a UAS is collected, it can support bundle adjustment aerial triangulation (AT) of UAS images and reduce the demands on ground control points (GCPs). This study installs a Trimble BD970 GNSS OEM on a fixed-wing UAS for capturing highly accurate GPS data by using a Virtual Base Station (VBS) RTK GPS technique for AT. Meanwhile, the GPS antenna-camera offset is resolved by stripwise linear drift parameters introduced in GPS observation equations, while performing bundle adjustment for AT. Additionally, self-calibration bundle adjustment is used in VBS RTK GPS-assisted AT to solve incomplete camera parameters calibrated by a close-range photogrammetric approach. The results show that the AT accuracy of fixed-wing UAS images collected with a 24 mm focal-length Canon EOS 5D Mark II camera at a flying height of 550 m above ground level is 0.21 m in planimetry and 0.22 m in height using two cross strips with two full GCPs at each corner of the block. The RMSE of check points from stereoscopic viewing can reach 0.27 m in planimetry and 0.24 m in height. The test results show that the accuracy of VBS RTK GPS-assisted bundle adjustment with self-calibration for the AT of fixed-wing UAS image can be used for updating local 1/5000 topographic maps in Taiwan.

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Cercy, Steven P. "Diagnostic accuracy of a new instrument for detecting cognitive dysfunction." International Journal of Geriatric Psychiatry 27, no. 9 (October 21, 2011): 914–23. http://dx.doi.org/10.1002/gps.2802.

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Larner, A. J. "Mini-Addenbrooke's cognitive examination diagnostic accuracy for dementia: reproducibility study." International Journal of Geriatric Psychiatry 30, no. 10 (September 16, 2015): 1103–4. http://dx.doi.org/10.1002/gps.4334.

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Hide, Chris, Terry Moore, Chris Hill, and David Park. "Low Cost, High Accuracy Positioning In Urban Environments." Journal of Navigation 59, no. 3 (August 23, 2006): 365–79. http://dx.doi.org/10.1017/s0373463306003936.

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It is well known that GPS measurements are regularly obstructed in urban environments. Positioning accuracy in such environments is significantly degraded and in many areas, it is not possible to obtain a GPS position fix at all. There are currently two methods that can be used to improve availability in the urban environment. Firstly, GPS receivers can be augmented with dead reckoning sensors such as an INS. Alternatively, High Sensitivity GPS (HSGPS) receivers can be used which are able to acquire and track very weak signals. This paper assesses the performance obtained from a GPS and low cost INS integrated system and a HSGPS receiver in an urban environment in Nottingham, UK. The navigation systems are compared to a high accuracy integrated GPS/INS system which is used to provide a reference trajectory. It is demonstrated that the differential GPS and low cost INS system can provide horizontal positioning accuracy of better than 2·5 m RMS in real-time, and better than 1 m RMS in post-processing, whereas the non-differential HSGPS receiver provides a real-time performance of 5 m RMS. These results were obtained in an environment where, with conventional GPS receivers, a position solution is only available 48·4% of the time. Operational considerations such as initial alignment of the GPS and low cost INS are also discussed when comparing the two systems for urban positioning applications.

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Emel’yantsev, G. I., A. P. Stepanov, B. A. Blazhnov, and I. V. Semenov. "Improving the accuracy of GPS compass for small sized vehicles." Giroskopiya i Navigatsiya 23, no. 1 (2015): 18–29. http://dx.doi.org/10.17285/0869-7035.2015.23.1.018-029.

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Yuan, De Bao, Xi Min Cui, Guo Wang, Jing Jing Jin, and Wei Xue. "Research on Improving the Accuracy of Positioning Data Obtained by GPS Module." Key Engineering Materials 500 (January 2012): 609–15. http://dx.doi.org/10.4028/www.scientific.net/kem.500.609.

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With the development of social and economic, for all walks of life, needs for geospatial information have been growing more and more rapidly, GIS\GPS technology have already deeply penetrated into the areas of land resources, logistics and urban management. Therefore, research on improving the accuracy of positioning data, which is obtained by GPS module that is relatively cheaper than measurement type GPS,to make Low-cost products acquiring position information as precise as possible, have high practical value to meet the demands of Low-precision navigation and agricultural Survey.

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Ma, Lihua, Xiaolan Wang, and Shengming Li. "Accuracy analysis of GPS broadcast ephemeris in the 2036th GPS week." IOP Conference Series: Materials Science and Engineering 631 (November 7, 2019): 042013. http://dx.doi.org/10.1088/1757-899x/631/4/042013.

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Coster, A., J. Williams, A. Weatherwax, W. Rideout, and D. Herne. "Accuracy of GPS total electron content: GPS receiver bias temperature dependence." Radio Science 48, no. 2 (March 2013): 190–96. http://dx.doi.org/10.1002/rds.20011.

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Ha, Ji-Hyun, Moon-Beom Heo, and Gi-Wook Nam. "Accuracy Analysis of Precise Point Positioning Using Predicted GPS Satellite Orbits." Journal of Korea Navigation Institute 16, no. 5 (October 30, 2012): 752–59. http://dx.doi.org/10.12673/jkoni.2012.16.5.752.

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Liu, C. J. "Effects of Selective Availability on GPS Positioning Accuracy." Southern Journal of Applied Forestry 26, no. 3 (August 1, 2002): 140–45. http://dx.doi.org/10.1093/sjaf/26.3.140.

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Abstract Deactivation of selective availability (SA) is expected to provide improvement in Global Positioning System (GPS) accuracy, and recent reports showed such improvements were realized immediately. However, most forestry GPS observations are made in subcanopy environments in which a GPS receiver's antenna can only receive GPS signals from a small region of the sky due to obstructions. Consequently, the satellite geometry will be poor, and position accuracy will suffer. Thus, there is a need to understand the impact of SA removal on positioning accuracy in high-PDOP subcanopy observations. This study found that it is difficult to approach the destination when GPS navigation is adversely influenced by SA accuracy degradation. When GPS positioning is performed after SA deactivation, a GPS observer can walk directly to the intended destination under thick tree canopies. Results also indicated that the horizontal accuracy is 73.3 m at the 95% probability level in the SA-degraded data set and 8.3 m in the SA-free data set. Further data analysis indicated that HDOPs (Langley 1999) recorded in the SA-on and the SA-off periods are not statistically significantly different. This suggests that a major portion of the difference in horizontal accuracies between SA-degraded and SA-free GPS observations can be attributed to difficulties in approaching the destination when SA is active. South. J. Appl. For. 26(3):140–145.

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Ishikawa, Kiichiro, Yoshiharu Amano, Takumi Hashizume, Jun-ichi Takiguchi, and Naoyuki Kajiwara. "A Mobile Mapping System for Precise Road Line Localization Using a Single Camera and 3D Road Model." Journal of Robotics and Mechatronics 19, no. 2 (April 20, 2007): 174–80. http://dx.doi.org/10.20965/jrm.2007.p0174.

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Precise highway alignment data to be used in car navigation and ITS to increase driving safety must be kept up-to-date and accurate. A Mobile Mapping System (MMS) provides a highway alignment database and offers unparalleled productivity when combined with navigation and videogrammetry tools. The MMS we propose features a GPS/Dead Reckoning (DR) combined navigation system, a three-axis GPS-Gyro/Inertial Measurement Unit (IMU), laser scanners, nearly horizontal cameras, and network-based Positioning Augmentation Services (PASTM) (Mitsubishi Electric Corporation) and measures center-line and side-line locations precisely based on a 3D road surface model. The carrier-phased D-GPS/DR navigation system and GPS-Gyro/IMU conducts highly accurate positioning in centimeters and posture estimation at 0.073° rms for heading, 0.064° rms for pitch, and 0.116° for roll. It provides 0.095 m rms accuracy for both center-line and side-line measurement when GPS visibility is sufficient. A comparison of accuracy between static RTK-GPS measurement and MMS measurement on the Tateyama Kurobe alpine route confirmed MMS dynamic measurement accuracy and effectiveness.

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Carstensen, Laurence W. "GPS and GIS: Enhanced Accuracy in Map Matching through Effective Filtering of Autonomous GPS Points." Cartography and Geographic Information Systems 25, no. 1 (January 1998): 51–62. http://dx.doi.org/10.1559/152304098782441778.

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Pázmányi, Sándor, Attila Dobos, and Sándor Pajna. "Accuracy of Location Identification by GPS and Possibilities for its Application in Agriculture." Acta Agraria Debreceniensis, no. 13 (May 4, 2004): 157–60. http://dx.doi.org/10.34101/actaagrar/13/3402.

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A description of the design and operating principle of the GPS system and the explanation of key terms of telemetric and chronometric measurements is followed by several examples characteristic of the results of factors which may influence accuracy of the identification of geographic location by satellites. In addition, results of accuracy testing of absolute GPS measurements and improvements of accuracy experienced and attributable to the alteration of the periods used for establishing average values are highlighted. Furthermore, we examined certain practical possibilities for the use of GPS systems in agriculture, emphasizing the advantages hidden in the use of GIS-GPS integration, crop mapping, soil maps and gross produce maps, in the application of the VRT (Variable Rate Technology) and in combinations of the same.

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Hanifah, Iftitahatul, and Bambang Nurcahyo Prastowo. "Uji GPS Tracking Dalam Skala Transportasi Antar Kota." IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 6, no. 2 (October 31, 2016): 175. http://dx.doi.org/10.22146/ijeis.15257.

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The accuracy level of a system in order to obtain an accurate data. Each tool has a different level of accuracy as well as to the accuracy of tracking system. This tracking system is used to locate a vehicle. It is usually using GPS tool to obtain position data in coordinate point.A GPS tracking testing system is constructed in this research to see positional data obtained from the GPS. Two GPS were used, a cn06 GPS as test GPS and GPSmap 76CSx as secondary data. Obtained data will be selected in coordinates, time, and speed. Selection of data is using regular expression in PHP. These data will later be displayed in the form of maker and web using Google Maps. The analysis will be done by comparing two markers that have adjacent time of retrieval.The result of this research shows that the factor that affect the difference in the accuracy of GPS is the speed of the vehicle. Other obstructing factors such as multi-storey building and large trees will have no effect if the speed is keep at constant pace. In this intercity testing, the result is similiar to previous study, that the important factor is the speed.

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Tahar, K. N. "HEIGHT ACCURACY BASED ON DIFFERENT RTK GPS METHOD FOR ULTRALIGHT AIRCRAFT IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-3/W3 (August 19, 2015): 287–92. http://dx.doi.org/10.5194/isprsarchives-xl-3-w3-287-2015.

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Height accuracy is one of the important elements in surveying work especially for control point’s establishment which requires an accurate measurement. There are many methods can be used to acquire height value such as tacheometry, leveling and Global Positioning System (GPS). This study has investigated the effect on height accuracy based on different observations which are single based and network based GPS methods. The GPS network is acquired from the local network namely Iskandar network. This network has been setup to provide real-time correction data to rover GPS station while the single network is based on the known GPS station. Nine ground control points were established evenly at the study area. Each ground control points were observed about two and ten minutes. It was found that, the height accuracy give the different result for each observation.

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Kim, Mingyu, and Jeongrae Kim. "A Long-term Accuracy Analysis of the GPS Klobuchar Ionosphere Model." Journal of the Korean Society for Aviation and Aeronautics 24, no. 2 (June 30, 2016): 11–18. http://dx.doi.org/10.12985/ksaa.2016.24.2.011.

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Aono, Toshihiro. "Position Estimation of Vehicle Using GPS Data and Internal Sensor Data." Journal of Robotics and Mechatronics 10, no. 4 (August 20, 1998): 295–300. http://dx.doi.org/10.20965/jrm.1998.p0295.

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This paper deals with an estimation method of vehicle position using differential GPS, a fiber optic gyro and wheel encoders. The estimated position must be accurate enough to be used for vehicle control. To realize this accuracy, the following factors must be considered. (1) The delay and scarcity of GPS data. (2) The drift of the gyro. (3) The inconstancy of the travel distance per encoder pulse due to the differential mechanism and slip of wheels. (4) The effect of the position of the GPS antenna on position estimation. We propose an observation model of GPS, a fiber optic gyro and wheel encoders, which considers these four factors. A position estimation method is developed on the basis of this observation model. A prototype of autonomous mower was produced to evaluate the position estimation method. The relation between the performance of the mower and the GPS accuracy is discussed in terms of the parallelism, the uniformity of the space, and the straightness. The experimental results show that the merit of using GPS data is remarkable for maintaining the parallelism. If GPS is more accurate than lm, it is shown that using GPS improves the uniformity of the spaces. We can have the prospect for mowing all over the ground if the overlap is allowed to be 0.2m and the GPS accuracy is lm.

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Mohammed, Israa H., Tariq N. Ataiwe, and Hisham Al Sharaa. "Accuracy Assessment of a Variety of GPS Data Processing, Online Services and Software." Geomatics and Environmental Engineering 15, no. 4 (September 17, 2021): 5–19. http://dx.doi.org/10.7494/geom.2021.15.4.5.

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The processing of GPS observations in precise positioning is complex and requires professional surveyors since it must be carried out after each static measurement. In GPS network adjustment, the obtaining of the correct coordinates of the determined point is possible after determining the components of GPS vectors and aligning the networks of these vectors, while PPP requires the availability of precise products for the reference satellites orbits and clock. For that reason, surveyors can take advantage of free online GPS data processing. In this paper, the authors compare the results obtained from different sources of free online GPS data processing (AUSPOS, OPUS, CenterPoint RTX, APPS, MagicGNSS, CSRS-PPP, GAPS, and SCOUT) in terms of their accuracy, availability, and operation. This is then compared with free GPS processing software (gLAB and RTKLIB), and finally with commercial software (TBC Trimble Business Center). The results show that online processing services are more accurate than offline processing software, which indicates the strength of their algorithms and processes. The CSRS-PPP online service had the best results. The difference between the relative solution of AUSPOS and OPUS, and CSRS-PPP is insignificant.

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Ross, Robert, and Rahinul Hoque. "Augmenting GPS with Geolocated Fiducials to Improve Accuracy for Mobile Robot Applications." Applied Sciences 10, no. 1 (December 23, 2019): 146. http://dx.doi.org/10.3390/app10010146.

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In recent decades Global Positioning Systems (GPS) have become a ubiquitous tool to support navigation. Traditional GPS has an error in the order of 10–15 m, which is adequate for many applications (e.g., vehicle navigation) but for many robotics applications lacks required accuracy. In this paper we describe a technique, FAGPS (Fiducial Augmented Global Positioning System) to periodically use fiducial markers to lower the GPS drift, and hence for a small time-period have a more accurate GPS determination. We describe results from simulations and from field testing in open-sky environments where horizontal GPS accuracy was improved from a twice the distance root mean square (2DRMS) error of 5.5 m to 2.99 m for a period of up-to 30 min.

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Yousef, Mohamed A., and Mustafa K. Ragheb. "EFFECT OF RECORDING INTERVAL ON GPS ACCURACY." JES. Journal of Engineering Sciences 42, no. 5 (September 1, 2014): 1215–31. http://dx.doi.org/10.21608/jesaun.2014.115062.

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Lewandowski, W., G. Petit, and C. Thomas. "Precision and accuracy of GPS time transfer." IEEE Transactions on Instrumentation and Measurement 42, no. 2 (April 1993): 474–79. http://dx.doi.org/10.1109/19.278607.

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Soler, Tomás, Gabriel Álvarez-García, Antonio Hernández-Navarro, and Richard H. Foote. "GPS High Accuracy Geodetic Networks in Mexico." Journal of Surveying Engineering 122, no. 2 (May 1996): 80–94. http://dx.doi.org/10.1061/(asce)0733-9453(1996)122:2(80).

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Lachapelle, G., M. Casey, R. M. Eaton, A. Kleusberg, J. Tranquilla, and D. Wells. "GPS MARINE KINEMATIC POSITIONING ACCURACY AND RELIABILITY." Canadian Surveyor 41, no. 2 (June 1987): 143–72. http://dx.doi.org/10.1139/tcs-1987-0012.

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Positioning accuracy and reliability are two parameters of major concern to GPS marine users. GPS limitations and error sources are analyzed from a user’s point of view. The coverage limitations inherent to the (18 + 3) satellite constellation are discussed and related outages inherent to specific geographical areas are described. Receiver and antenna characteristics are described in relation to their effect on positioning accuracy and reliability. Antenna requirements for shipborne applications are discussed. The effect of the troposphere and ionosphere on GPS measurements is quantified for various cases. Multipath and imaging effects on both P and CIA code and carrier phase measurements are discussed. A variety of user accuracy and reliability enhancements are described. These include the use of seven-channel receivers and that of height and time constraints to increase redundancy and limit poor geometry effects, the use of differential methods to reduce satellite and propagation medium errors, the integration of code and carrier phase measurements to increase positioning accuracy, and the use of external sensors such as pitch and roll sensors, and inertial navigation systems. It is concluded that GPS is capable of achieving the one metre accuracy level for marine applications provided that error sources specific to shipborne applications can be effectively controlled.

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WONG, R. V. C., K. P. SCHWARZ, and M. E. CANNON. "High-Accuracy Kinematic Positioning by GPS-INS." Navigation 35, no. 2 (June 1988): 275–87. http://dx.doi.org/10.1002/j.2161-4296.1988.tb00956.x.

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Akoum, Samer I., and Yousef Al-Assaf. "IMPROVING GPS ACCURACY USING NEURO-FUZZY SYSTEM." IFAC Proceedings Volumes 38, no. 1 (2005): 378–83. http://dx.doi.org/10.3182/20050703-6-cz-1902.01141.

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Sanli, D. Ugur, and Cetin Engin. "Accuracy of GPS positioning over regional scales." Survey Review 41, no. 312 (April 2009): 192–200. http://dx.doi.org/10.1179/003962609x390094.

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Choi, Sunglok, and Jong-Hwan Kim. "Leveraging Localization Accuracy With Off-Centered GPS." IEEE Transactions on Intelligent Transportation Systems 21, no. 6 (June 2020): 2277–86. http://dx.doi.org/10.1109/tits.2019.2915108.

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Filjar, Renato. "Horizontal GPS Positioning Accuracy During the 1999 Solar Eclipse." Journal of Navigation 54, no. 2 (May 2001): 293–96. http://dx.doi.org/10.1017/s0373463301001370.

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Although GPS positioning errors are now well described, there are still some uncertainties regarding the impact of some rare space weather phenomena on GPS positioning accuracy. Solar eclipses have been considered as one source of such rare events, so the 1999 solar eclipse gave the opportunity to collect horizontal GPS positioning data for further analysis. The results of statistical analysis show no deterioration of horizontal GPS positioning accuracy. Space weather, ionospheric and geomagnetic conditions were also carefully analysed and showed no significant activity. In conclusion, the experiment confirmed negligible impact of the 1999 solar eclipse on horizontal GPS positioning accuracy, and opens discussion concerning application of satellite positioning systems in space and ionospheric weather monitoring.

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Naranjo, J. E., F. Jiménez, F. Aparicio, and J. Zato. "GPS and Inertial Systems for High Precision Positioning on Motorways." Journal of Navigation 62, no. 2 (March 12, 2009): 351–63. http://dx.doi.org/10.1017/s0373463308005249.

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The accurate location of a vehicle in the road is one of the most important challenges in the automotive field. The need for accurate positioning affects several in-vehicle systems like navigators, lane departure warning systems, collision warning and other related sectors such as digital cartography suppliers. The aim of this paper is to evaluate high precision positioning systems that are able to supply an on-the-centimetre accuracy source to develop on-the-lane positioning systems and to be used in future applications as an information source for autonomous vehicles that circulate at high speeds on public roads. In this paper we have performed some on-road experiments, testing several GPS-based systems: Autonomous GPS; RTK Differential GPS with a proprietary GPS base station; RTK Differential GPS connected to the public GPS base station network of the National Geographic Institute of Spain via vehicle-to-infrastructure GPRS communications; and GPS combination with inertial measurement systems (INS) for position accuracy maintenance in degraded satellite signal reception areas. In these tests we show the validity and the comparison of these positioning systems, allowing us to navigate, in some cases, on public roads at speeds near 120 km/h and up to 100 km from the start position without any significant accuracy reduction.

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Journal articles on the topic 'GPS accuracy'

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