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On improving navigation accuracy of GPS/INS systems / Dorota A. Grejner-Brzezinska in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 4 (April 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 4 (April 2005) Titre : On improving navigation accuracy of GPS/INS systems Type de document : Article/Communication Auteurs : Dorota A. Grejner-Brzezinska, Auteur ; Charles K. Toth, Auteur ; Y. Yi, Auteur Année de publication : 2005 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] capteur à balayage [Termes IGN] capteur imageur [Termes IGN] centrale inertielle [Termes IGN] élément d'orientation externe [Termes IGN] filtrage du bruit [Termes IGN] géoréférencement direct [Termes IGN] GPS-INS [Termes IGN] modèle d'erreur [Termes IGN] modèle stochastique [Termes IGN] orientation du capteur [Termes IGN] pesanteur terrestre [Termes IGN] point d'appui [Termes IGN] positionnement par GPS [Termes IGN] précision de localisation [Termes IGN] système de numérisation mobile Résumé : (Auteur) Direct georeferencing, also referred to as direct platform orientation (DPO), is defined as direct measurement of the imaging sensor external orientation parameters (EOP), using positioning and orientation sensors, such as the Global Positioning System (GPS) and Inertial Navigation System (INS) or Inertial Measurement Unit (Imu). Imaging sensors, most frequently supported by the Dpo technique, are digital cameras, lidar systems, multi-spectral or hyper-spectral scanners, or interferometric synthetic aperture radar (INSAR). While for scanning sensors, the use of Dpo is compulsory, frame digital cameras can also directly benefit from this modern technique of sensor orientation. With direct sensor orientation, the requirement for ground control, tie-point matching and aerotriangulation (AT) is significantly reduced, or even entirely eliminated, resulting in shorter times of data acquisition and processing, and streamlined and highly automated data workflow and quality control. Most of the time, the requirement for ground control points is limited to periodic system calibrations and quality control check. Direct georeferencing is considered a fundamental technology of conventional mobile mapping systems (MMS). Despite significant progress in GSP/INS-based direct georeferencing technology in the last decade, there is still room for improvement in terms of better accuracy and better tolerance to GPS outages. This paper is focused on three error modeling and compensation techniques that could potentially improve GPS/INS system's performance on both land-based and airborne platforms : (1) extended gravity compensation, (2) IMU signal de-noising, and (3) stochastic modeling of IMU errors. Numéro de notice : A2005-158 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.14358/PERS.71.4.377 En ligne : https://doi.org/10.14358/PERS.71.4.377 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27296 [article]

GPS + INS + pseudolites: an integrated positioning system / Y. Yi in GPS world, vol 14 n° 7 (July 2003)

Public [article]  inGPS world > vol 14 n° 7 (July 2003) . - pp 42 - 49 Titre : GPS + INS + pseudolites: an integrated positioning system Type de document : Article/Communication Auteurs : Y. Yi, Auteur ; Dorota A. Grejner-Brzezinska, Auteur ; Charles K. Toth, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 42 - 49 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] GPS-INS [Termes IGN] positionnement cinématique en temps réel [Termes IGN] pseudolite [Termes IGN] signal GPS [Termes IGN] véhicule automobile Résumé : (Auteur) Kinematic positioning has become a standard GPS technique for precision navigation that supports surveying and mapping systems. One application for which the high accuracy and reliability of kinematic positioning are required is mobile mapping, whose market has significantly expanded in the past 10 years. Inertial navigation systems (INS) normally augment GPS to provide continuous and accurate trajectory and attitude information from the imaging sensors of mobile mapping systems. GPS contributes high accuracy and long-term stability (with properly resolved integer ambiguities and no losses of lock) and provides a means of error estimation for the INS sensor. A GPS-calibrated INS provides reliable bridging during GPS outages and supports ambiguity resolution after the CPS signal lock is re-established. Thus, high navigation accuracy normally can be achieved even if GPS signals are subject to occasional block-ages. But what if GPS signals are lost for extended periods of time or the visible constellation is limited to four or fewer satellites, which can often happen in urban canyons? Pseudo-satellites (pseudolites) may be the answer. This month's column discusses an experimental GPS/INS/pseudolite system, with special emphasis on the error spectrum and the navigation performance analysis based on a medium-accuracy and highly reliable INS, limited GPS constellation availability, and a varying number of pseudolites. It also describes simulated and actual pseudolite data in typical noisy environments and analyses their impact on navigation accuracy. Copyright Advanstar Communications Numéro de notice : A2003-441 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26520 [article]

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Determination of gridded mean sea surface from Topex, ERS-1 and Geosat altimeter data / Y. Yi (1995)

Public Titre : Determination of gridded mean sea surface from Topex, ERS-1 and Geosat altimeter data Type de document : Monographie Auteurs : Y. Yi, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1995 Collection : Department of Geodetic Science and Surveying Reports num. 434 Importance : 93 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ERS [Termes IGN] GEOSAT [Termes IGN] hauteurs de mer [Termes IGN] modélisation [Termes IGN] niveau moyen des mers [Termes IGN] TOPEX Résumé : (Auteur) A mean sea surface (MSS) grid model on a 1°/16 grid was developed using one year mean sea surface height (SSH) data of the Topex, Geosat and 35-day repeat ERS-1 altimeter satellites. The first cycle data of 168-day repeat ERS-1 were also included. The MSS data represent average heights of the ocean surface above the Topex/Poseidon reference ellipsoid during Topex repeat cycles 17 through 53. The one year mean SSH data of each satellite were computed by time-averaging SSH values of all available cycles at fixed points on the reference track. The inverted barometer (IB) correction had been applied to all SSH data before they were reduced to reference tracks correcting for the geoid gradients. The ocean tide correction of the Topex SSH data used in this study had been improved over the Cartwright and Ray 1990 model in a preliminary analysis which estimated residual signals of four major ocean tide constituents along with additional modeling of the annual and semiannual variations and the global secular SSH change. As a by-product of this preliminary data analysis, a sea level rise rate of 2.3 mm/yr. was obtained from Topex SSH data for cycles 4 through 58 after correcting for the drift rate of Topex altimeter. A gridding method of the least squares collocation was used with a covariance function based on the second-order Markov process. Global test comparisons of several recently developed MSS grid models showed that the MSS model determined in this study had the best agreement with the SSH and along-track SSH gradient data of Topex, Geosat and ERS-1 satellites. The MSS grid model determined in this study, however, contains the artifact of cross-track gradients which show the visual pattern of satellite ground tracks in regions with strong ocean variability. The artificial cross-track gradients of this MSS model can create errors of about 0.2 - 0.3 cm of MSS gradient correction for the ocean-wide Topex data. Another version of the MSS model corresponding to the SSH data without the IB correction was also produced but it was found that the MSS model with the IB correction is preferred. Numéro de notice : 12107 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54536

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Change of the sea surface topography determined from Geosat altimeter due to a change of the wet tropospheric correction / Y. Yi (1992)

Public Titre : Change of the sea surface topography determined from Geosat altimeter due to a change of the wet tropospheric correction Type de document : Monographie Auteurs : Y. Yi, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1992 Collection : Department of Geodetic Science and Surveying Reports num. 417 Importance : 46 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Nivellement [Termes IGN] données altimétriques [Termes IGN] surface de la mer [Termes IGN] troposphère Numéro de notice : 12102 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54532

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