Download or read book Near Real time Precise Orbit Determination of Low Earth Orbit Satellites Using an Optimal GPS Triple differencing Technique written by Tae-Suk Bae and published by . This book was released on 2006 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: During the last decade, numerous Low Earth Orbit (LEO) satellites, including TOPEX/POSEIDON, CHAMP and GRACE, have been launched for scientific purposes at altitudes ranging from 400 km to 1300 km. To support GPS meteorology, efficient LEO orbit determination methods were developed using the triple-differenced GPS phase observations. These methods include the kinematic, dynamic, and reduced-dynamic approach based on the wave algorithm. To test the developed algorithms, 24 hours of CHAMP data on February 15, 2003, which amounts to 15 revolutions, were used for each method. Precise IGS orbits are used for the GPS satellites, and 43 IGS ground tracking stations were chosen using the algorithm developed in this study, based on the network optimization theory. The estimated orbit solutions were compared with the published Rapid Science Orbit (RSO) and the consistency testing was performed for the dynamic solution. In addition, the SLR residuals were also computed as an independent validation of the methods presented here. After the forward and backward filtering, the kinematic approach shows accuracy better than "20 cm in 3D RMS for a half day arc compared to the reference RSO. With this careful modeling, the dynamic solution shows an agreement within "8 cm in position and "0.12 mm/s in velocity of RSO. The computation time of the dynamic solution for the 24-hour arc is 2.5 hours on a 3 GHz PC platform. The wave algorithm shows a better fit to RSO for each tested segment. However, there is slightly larger bias in its solution, thus, the overall RMS of fit is comparable to the dynamic orbit solution. The CHAMP orbit is successfully estimated in this study to support, for example, the GPS meteorology, using a new method that is accurate as well as fast and efficient. The hypothesis testing indicates that the estimated dynamic solution of this study is consistent with the published RSO. Also, the SLR residual test shows that the CHAMP orbit solution estimated in this study is comparable to solutions determined by other analysis centers, such as JPL and GFZ.
Download or read book Measurement Data Modeling and Parameter Estimation written by Zhengming Wang and published by CRC Press. This book was released on 2016-04-19 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theories, methods, and application techniques of the measurement data mathematical modeling and parameter estimation. It seeks to build a bridge between mathematical theory and engineering practice in the measurement data processing field so theoretical researchers and technical engineers can communicate. It is organized with abundant materials, such as illustrations, tables, examples, and exercises. The authors create examples to apply mathematical theory innovatively to measurement and control engineering. Not only does this reference provide theoretical knowledge, it provides information on first hand experiences.
Download or read book Efficient Methods for Determining Precise Orbits of Low Earth Orbiters Using the Global Positioning System written by Heike Bock and published by . This book was released on 2003 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Error Assessment of an Autonomous Real time Precision Orbit Determination Program for a Low Earth orbit Satellite Using GPS Observation Data written by Juan Hyun Jo and published by . This book was released on 2002 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precision Orbit Determination from GPS Receiver Navigation Solutions written by Scott Shannon Carter and published by . This book was released on 1996-06-01 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite tracking techniques have traditionally been limited to ground-based stations that measure a satellite's range, azimuth, elevation and range rate, The advent of high accuracy Global Positioning System (GPS) navigation techniques, however, offers alternative methods. This thesis investigates the use of GPS navigation solutions (earth-centered, earth-fixed position and velocity information) as an observation source in a weighted least- squares orbit determination process. Such an orbit determination scheme could limit dependence upon the costly and complex ground-based tracking facilities for low and medium earth orbit satellites, while providing real-time information for on-board instrumentation and mission management. This investigation included modification of the Draper Laboratory version of the Goddard Trajectory Determination System (Draper R&D GTDS) to include coordinate systems compatible with the Fifth Fundamental Catalogue (FK5) and an inertial true equator and equinox of date frame. Solid earth tide modeling was introduced for numerical integration techniques and refined for semianalytic methods. The accuracy of the navigation solution-derived orbits (and the ability of Draper R&D GTDS to model spacecraft motion) is determined for the Ocean Topography Experiment (TOPEX), Technology for Autonomous Operational Survivability (TAOS), and Extreme Ultraviolet Explorer (EUVE) through comparison to high quality, independently generated 'truth' solutions (Precise Orbit Ephemerides, or POEs).
Download or read book Satellite Orbits written by Oliver Montenbruck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This modern presentation guides readers through the theory and practice of satellite orbit prediction and determination. Starting from the basic principles of orbital mechanics, it covers elaborate force models as well as precise methods of satellite tracking. The accompanying CD-ROM includes source code in C++ and relevant data files for applications. The result is a powerful and unique spaceflight dynamics library, which allows users to easily create software extensions. An extensive collection of frequently updated Internet resources is provided through WWW hyperlinks.
Download or read book Geometrical Theory of Satellite Orbits and Gravity Field written by Drazen Svehla and published by Springer. This book was released on 2018-07-02 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on space geodesy presents pioneering geometrical approaches in the modelling of satellite orbits and gravity field of the Earth, based on the gravity field missions CHAMP, GRACE and GOCE in the LEO orbit. Geometrical approach is also extended to precise positioning in space using multi-GNSS constellations and space geodesy techniques in the realization of the terrestrial and celestial reference frame of the Earth. This book addresses major new developments that were taking place in space geodesy in the last decade, namely the availability of GPS receivers onboard LEO satellites, the multitude of the new GNSS satellite navigation systems, the huge improvement in the accuracy of satellite clocks and the revolution in the determination of the Earth's gravity field with dedicated satellite missions.
Download or read book Geodesy for Planet Earth written by Steve Kenyon and published by Springer Science & Business Media. This book was released on 2012-01-26 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings include the written version of 130 papers presented at the International Association of Geodesy IAG2009 "Geodesy for Planet Earth" Scientific Assembly. It was held 31 August to 4 September 2009 in Buenos Aires, Argentina. The theme "Geodesy for Planet Earth" was selected to follow the International Year of Planet Earth 2007-2009 goals of utilizing the knowledge of the world’s geoscientists to improve society for current and future generations. The International Year started in January 2007 and ran thru 2009 which coincided with the IAG2009 Scientific Assembly, one of the largest and most significant meetings of the Geodesy community held every 4 years. The IAG2009 Scientific Assembly was organized into eight Sessions. Four of the Sessions of IAG2009 were based on the IAG Structure (i.e. one per Commission) and covered Reference Frames, Gravity Field, Earth Rotation and Geodynamics, and Positioning and Applications. Since IAG2009 was taking place in the great Argentine city of Buenos Aires, a Session was devoted to the Geodesy of Latin America. A Session dedicated to the IAG’s Global Geodetic Observing System (GGOS), the primary observing system focused on the multidisciplinary research being done in Geodesy that contributes to important societal issues such as monitoring global climate change and the environment. A Session on the IAG Services was also part of the Assembly detailing the important role they play in providing geodetic data, products, and analysis to the scientific community. A final Session devoted to the organizations ION, FIG, and ISPRS and their significant work in navigation and earth observation that complements the IAG.
Download or read book Real Time Autonomous Precise Orbit Determination Using the Global Positioning System written by and published by . This book was released on 2000 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an effort to estimate precise satellite ephemeris in real-time on board a satellite, the Goddard Space Flight Center (GSFC) created the GPS Enhanced Orbit Determination Experiment (GEODE) flight navigation software. This dissertation offers alternative methods and improvements to GEODE to increase on board autonomy and real-time total position accuracy and precision without increasing computational burden. First, GEODE is modified to include a Gravity Acceleration Approximation Function (GAAF) to replace the traditional spherical harmonic representation of the gravity field. Next, an ionospheric correction method called Differenced Range Versus Integrated Doppler (DRVID) is applied to correct for ionospheric errors in the GPS measurements used in GEODE. Then, Dynamic Model Compensation (DMC) is added to estimate unmodeled and/or mismodeled forces in the dynamic model and to provide an alternative process noise variance-covariance formulation. Finally, a Genetic Algorithm (GA) is implemented in the form of Genetic Model Compensation (GMC) to optimize DMC forcing noise parameters. Application of GAAF, DRVID an(i DMC improved GEODE's position estimates by 28.3% when applied to GPS/MET data collected in the presence of Selective Availability (SA), 17.5% when SA is removed from the GPS/MET data and 10.8% on SA free TOPEX data. Position estimates with RSS errors below 1 meter are now achieved using SA free TOPEX data. DRVID causes an increase in computational burden while GAAF and DMC reduce computational burden. The net effect of applying GAAF, DRVID and DMC is an improvement in GEODE's accuracy/precision without an increase in computational burden.
Download or read book Precise Geodetic Infrastructure written by National Research Council and published by National Academies Press. This book was released on 2010-11-25 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geodesy is the science of accurately measuring and understanding three fundamental properties of Earth: its geometric shape, its orientation in space, and its gravity field, as well as the changes of these properties with time. Over the past half century, the United States, in cooperation with international partners, has led the development of geodetic techniques and instrumentation. Geodetic observing systems provide a significant benefit to society in a wide array of military, research, civil, and commercial areas, including sea level change monitoring, autonomous navigation, tighter low flying routes for strategic aircraft, precision agriculture, civil surveying, earthquake monitoring, forest structural mapping and biomass estimation, and improved floodplain mapping. Recognizing the growing reliance of a wide range of scientific and societal endeavors on infrastructure for precise geodesy, and recognizing geodetic infrastructure as a shared national resource, this book provides an independent assessment of the benefits provided by geodetic observations and networks, as well as a plan for the future development and support of the infrastructure needed to meet the demand for increasingly greater precision. Precise Geodetic Infrastructure makes a series of focused recommendations for upgrading and improving specific elements of the infrastructure, for enhancing the role of the United States in international geodetic services, for evaluating the requirements for a geodetic workforce for the coming decades, and for providing national coordination and advocacy for the various agencies and organizations that contribute to the geodetic infrastructure.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Precise Satellite Orbits and Geodetic Parameters using Satellite Laser Ranging written by Krzysztof Sośnica and published by Astronomical Institute, University of Bern, Switzerland. This book was released on 2014-04-07 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contribution of Satellite Laser Ranging (SLR) to the definition of the origin of the reference frame (geocenter coordinates), the global scale, and low degree coefficients of the Earth's gravity field is essential due to the remarkable orbit stability of geodetic satellites and the accuracy of laser observations at a level of a few millimeters. Considering these aspects, SLR has an exceptional potential in establishing global networks and deriving geodetic parameters of the supreme quality. SLR faces today the highest requirements of the Global Geodetic Observing System (GGOS) yielding 1 mm of long-term station coordinate and 0.1 mm/y of station velocity stability. The goal of this work is to assess the contribution of the latest models and corrections to the SLR-derived parameters, to enhance the quality and reliability of the SLR-derived products, and to propose a new approach of orbit parameterization for low orbiting geodetic satellites. The impact of orbit perturbations is studied in detail, including perturbing forces of gravitational origin (Earth's gravity field, ocean and atmosphere tides) and perturbing forces of non-gravitational origin (atmospheric drag, the Yarkovsky effect, albedo and Earth's infrared radiation pressure). A multi-satellite combined solution is obtained using SLR observations to LAGEOS-1, LAGEOS-2, Starlette, Stella, and AJISAI. The quality of the SLR-derived parameters from the combined solution is compared with external solutions. The Earth rotation parameters are compared to the IERS-08-C04 series and the GNSS-derived series, whereas the time variable Earth's gravity field coefficients are compared to the CHAMP and GRACE-derived results.
Download or read book Near Real Time Orbit Determination of Bilsat 1 written by Serkan Ural and published by LAP Lambert Academic Publishing. This book was released on 2010-08 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Artificial satellites are integrated with a wide area of applications expanding with a new contribution every day. The need for knowing the satellite s state at a specific instant of time with variable accuracy requirements depending on the purpose exists for all artificial satellites. A variety of techniques has emerged since the first satellite launched to its orbit and more techniques will surely be involved as far as the pursuit of higher efficiency exists. There are various orbit determination strategies in which the GPS observables are involved. This book investigates different algorithms using the data from the GPS receiver on board the first Turkish remote sensing micro-satellite BilSAT-1. Pseudorange observations of BilSAT-1 obtained from TÜB TAK-UZAY are used to perform different orbit determination algorithms. Both a kinematic orbit determination approach with least squares estimation on the basis of Gauss- Markoff model and reduced-dynamic orbit determination approach with Kalman filter estimation algorithms are investigated to explore the affects of variations in the algorithms.
Download or read book Statistical Orbit Determination written by Bob Schutz and published by Elsevier. This book was released on 2004-06-26 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical Orbit Determination presents fundmentals of orbit determination--from weighted least squares approaches (Gauss) to today's high-speed computer algorithms that provide accuracy within a few centimeters. Numerous examples and problems are provided to enhance readers' understanding of the material. Covers such topics as coordinate and time systems, square root filters, process noise techniques, and the use of fictitious parameters for absorbing un-modeled and incorrectly modeled forces acting on a satellite. Examples and exercises serve to illustrate the principles throughout each chapter.
Download or read book Springer Handbook of Global Navigation Satellite Systems written by Peter Teunissen and published by Springer. This book was released on 2017-06-16 with total page 1335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Handbook presents a complete and rigorous overview of the fundamentals, methods and applications of the multidisciplinary field of Global Navigation Satellite Systems (GNSS), providing an exhaustive, one-stop reference work and a state-of-the-art description of GNSS as a key technology for science and society at large. All global and regional satellite navigation systems, both those currently in operation and those under development (GPS, GLONASS, Galileo, BeiDou, QZSS, IRNSS/NAVIC, SBAS), are examined in detail. The functional principles of receivers and antennas, as well as the advanced algorithms and models for GNSS parameter estimation, are rigorously discussed. The book covers the broad and diverse range of land, marine, air and space applications, from everyday GNSS to high-precision scientific applications and provides detailed descriptions of the most widely used GNSS format standards, covering receiver formats as well as IGS product and meta-data formats. The full coverage of the field of GNSS is presented in seven parts, from its fundamentals, through the treatment of global and regional navigation satellite systems, of receivers and antennas, and of algorithms and models, up to the broad and diverse range of applications in the areas of positioning and navigation, surveying, geodesy and geodynamics, and remote sensing and timing. Each chapter is written by international experts and amply illustrated with figures and photographs, making the book an invaluable resource for scientists, engineers, students and institutions alike.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Zero Difference Geometrical Precise Orbit Determination of Low Flying Satellites with GPS SST Observations written by Akbar Shabanloui and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
