October 2024
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1 Citation
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October 2024
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1 Citation
August 2024
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95 Reads
Journal of Surveying Engineering
The journal editors of the last 40 years—in respectful memory of David A.Wahlstrom (editor, 1989–1992), deceased—have joined in this editorial to commemorate the 150th anniversary of the Journal of Surveying Engineering, an exciting milestone for the oldest periodical in the field with wide international recognition and a century and a half of continuous publishing.
January 2024
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9 Reads
GPS Solutions
August 2023
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316 Reads
GPS Solutions
On April 12, 2023 the vibrant and creative life of Profes-sor Ivan Istvan Mueller, geodesist, scientific book writer,educator, academician, editor, policymaker, and administrator, ceased forever at 93 years of age to the dismay of his close family, a plethora of students from multinational back-grounds, past coworkers, international colleagues, and scores of treasured friends. Thanks to him, many people he trained on the scientific skills demanded by geodetic research have superbly succeeded in their professional careers. We have decided to contribute a few words of empathy and remembrance in homage to his extraordinary unselfish commitment to education. However, this is not going to be a litany of his extensive national and international achievements inter-spaced with honors and recognitions, but ordinary reflections from the bottom of our hearts articulated by a bunch of students/researchers that mingled and worked together with him in the 1970s under the intellectual realm of an extraordinary mind that never deleted the human variable from the equations.The attached narrative amounts to a very minimal compensation for the altruistic spirit that Ivan propagated during our years at the Department of Geodetic Science of The Ohio State University. The totality of his research team is deeply grateful to have known and friendship a scholar with a clear logical vision and yet, incredibly talented in the field of geodetic science, a sophisticated branch of geophysics not very well-known to the population at large. Without any hesitation, it can be said that Ivan Mueller was one of the best international ambassadors of geodesy and a firm believer in its quantifiable importance at planetary scales.Below are recounted individual personal accolades to Ivan I. Mueller from some of us who lived the day-to-day activities with him and experienced firsthand his constant positive encouragement while, at the same time, fulfilling the dual objective of reaching scientific maturity while simultaneously improving our civic development, all with the modest aim of building a stable future. Ivan, thanks a lot for your help. Your legacy will endure!
September 2020
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49 Reads
GPS Solutions
April 2015
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5 Reads
April 2015
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1,817 Reads
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516 Citations
GPS Satellite Surveying is the classic text on the subject, providing the most comprehensive coverage of global navigation satellite systems applications for surveying. Fully updated and expanded to reflect the field's latest developments, this new edition contains new information on GNSS antennas, Precise Point Positioning, Real-time Relative Positioning, Lattice Reduction, and much more. New contributors offer additional insight that greatly expands the book's reach, providing readers with complete, in-depth coverage of geodetic surveying using satellite technologies. The newest, most cutting-edge tools, technologies, and applications are explored in-depth to help readers stay up to date on best practices and preferred methods, giving them the understanding they need to consistently produce more reliable measurement. Global navigation satellite systems have an array of uses in military, civilian, and commercial applications. In surveying, GNSS receivers are used to position survey markers, buildings, and road construction as accurately as possible with less room for human error. GPS Satellite Surveying provides complete guidance toward the practical aspects of the field, helping readers to: - Get up to speed on the latest GPS/GNSS developments - Understand how satellite technology is applied to surveying - Examine in-depth information on adjustments and geodesy - Learn the fundamentals of positioning, lattice adjustment, antennas, and more
April 2015
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9 Reads
April 2015
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41 Reads
April 2015
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12 Reads
... In this work, a Least Square Adjustments (LSA) is used to compute plane parameters [15]. This method gives the four parameters (i.e. ...
April 2015
... The undifferenced and uncombined observable of the GNSS pseudorange and carrier phase is generally expressed as (Leick et al. 2015) where r , s and f are the receiver, satellite and frequency, respectively;P s r,f , s r,f are pseudorange and carrier phase from receiver r to satellites s on frequency f in length unties, respectively; s r denotes the geometric distance between the phase center of the satellite and receiver antennas at the signal transmitting and receiving time, respectively; t r is the receiver clock bias in units of length; T s r is the zenith tropospheric delay that can be converted to slant with the mapping function ; I Z denotes the zenith TEC with the frequency and elevation angle dependent factor f = 40.3 f 2 ⋅ mf(e), s r is the ionospheric mapping function; b s r = b r − b s is the frequency dependent code bias (Li et al. 2011); N s r is the float ambiguity in cycle units with the corresponding wave length f ; P and denote the sum of measurement noise and multipath error for the pseudorange and carrier phase, respectively. ...
April 2015
... Global Positioning System (GPS) is often used synonymously with Global Navigation Satellite System (GNSS) [16,17]. Both technologies rely on a receiver station that utilizes signals from a constellation of satellites providing positional and timing data from space, yet GPS satellites are those associated with the United States, while GNSS is comprised of navigation satellites fielded by a wide array of participating countries ( Table 1). ...
April 2015
... The very first step of model validation is usually the employment of an overall model test to detect for unspecified model misspecifications (Koch 1987;Teunissen 2006). The current detectors in use for mixed-integer GNSS models are the ambiguity-float (AF) and the ambiguityknown (AK) detector (Leick et al. 2015;Teunissen and Montenbruck 2017). The AF-detector considers the ambi-guity vector unknown, while the AK-detector assumes the ambiguity vector to be completely known. ...
April 2015
... These systems employ a code division multiple access (CDMA) technique to identify signals for different satellites. However, the legacy signals of the Russian GLONASS system are based on frequency division multiple access (FDMA), where the wavelengths of the carrier phase are different for different satellites, resulting in loss of the integer nature for directly estimated DD ambiguity (Leick 1998;Geng et al. 2017;Banville et al. 2018). This poses a challenge to the compatibility and interoperability of GLO-NASS and CDMA systems in NRTK. ...
May 1998
Journal of Surveying Engineering
... To obtain stable and accurate parameter estimation, scholars have proposed statistical hypothesis testing methods and robust iterative estimation methods (Leick and Emmons 1994;Teunissen 1995;Guo et al. 2010). These quality control methods are often theoretically rigorous. ...
February 1994
Journal of Surveying Engineering
... The FDMA technique results in different frequencies of the satellite signals received by a receiver at an instant. As a result, nonzero inter-frequency biases (IFB) can be presented because the delays of hardware and digital signal processing vary to frequency and receiver types (Pratt et al. 1998;Wang et al. 2001;Zinoviev et al. 2009). ...
July 2001
GPS Solutions
... There is a strong interest in including GLONASS satellites in any GPS positioning solution. It is well known that additional satellites strengthen the solution and increase its reliability (Leick 1998). Unlike GPS, GLONASS satellites transmit signals at different frequencies, which causes a significant complexity in terms of the modelling and ambiguity resolution for an integrated GPS and GLONASS data processing system ( Wang et al., 2001). ...
July 1998
GPS Solutions