Book.
1950 - Gale Group | East Germany
Zhenzhu Zhao, Jiangfan Liu, Jinsheng Zhang, Xiaoli Xi,
... Access Sky–ground wave signal separation in enhanced Loran based on Levenberg–Marquart algorithm Zhenzhu Zhao, Zhenzhu ... proposes a high-precision algorithm used in enhanced Loran sky–ground wave separation based on the Levenberg– ... noise ratio. Furthermore, when the skywave of enhanced Loran has at least a 35 μs time delay ... studies have led to a consensus that the Loran-C navigation system can be used as a GNSS backup system [4-7]. Loran-C is a terrestrial, low-frequency, hyperbolic radio ... and processing, the maximum interference of the enhanced Loran signal is its homologous skywave interference [9]. Technologies ...
Tópico(s): Direction-of-Arrival Estimation Techniques
2021 - Institution of Engineering and Technology | IET Radar Sonar & Navigation
Book.
1950 - Gale Group | East Germany
Gregory Johnson, Ruslan Shalaev, Richard J. Hartnett, Peter F. Swaszek, Mitchell J. Narins,
... makers in their evaluation of the future of Loran-C in the United States. In a recently completed Navigation Transition Study, the FAA concluded that Loran-C, as an independent radio navigation (RNAV) system, ... for the global positioning system (GPS). However, for Loran-C to be considered a viable backup system ... the tests and evaluations to help determine whether Loran can provide the accuracy, availability, integrity, and continuity ... A major part of assessing the suitability of Loran is in understanding the nature of Loran ground ...
Tópico(s): Air Traffic Management and Optimization
2005 - Institute of Electrical and Electronics Engineers | IEEE Aerospace and Electronic Systems Magazine
Willem Cornelis Loran van Schaik,
Provenance: Author's Presentation Inscription to S. Birnie on Front Free Endpaper.; The Burndy Library Collection at the Huntington Library. Book.
1882 - Gale Group | NCCO-STM 1of2
Pyo-Woong Son, Joon Hyo Rhee, Jiwon Seo,
... intends to utilize the existing long-range navigation (Loran) infrastructure to provide a backup navigation capability to ... users. However, the observed accuracy of a conventional Loran positioning fix during a field test in Incheon, ... tries to provide. The largest error source for Loran is the additional secondary factor (ASF) delay. A ... correction method that is applicable to the existing Loran signals in Northeast Asia. The demonstrated accuracy with ... was 32.12 m when using a single Loran chain for positioning. In order to utilize the ...
Tópico(s): GNSS positioning and interference
2017 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Aerospace and Electronic Systems
Seth J. Wolcott, Loran Thompson,
Letters: Seth J. Wolcott and Loran Thompson; December 05, 1860 to Lewis Tappan Esq, Treausrer of the A. M. A.; Kingston, Jamaica.
1860 - Gale Group | SAS Part 1
The Loran-C system of navigation recently became usable in the rho-rho (range-range) mode with the installation of atomic clocks at all the Loran-C stations. This paper outlines briefly the principles of rho-rho Loran-C operation and the associated problems of geodesy ... It describes the procedure for using rho-rho Loran-C alone and in combination with Satellite Navigation, ... magnitudes of the various sources of errors in Loran-C range measurements for both the standalone and ... ranging accuracy of 270 m using rho-rho Loran-C alone with an improvement to about 180 ...
Tópico(s): Radio Wave Propagation Studies
2015 - Oxford University Press | The International Hydrographic Review
Letters: Loran Thomspon; August 08, 1861 to Reverend George Whipple, Cor. Sec. of A. M. A.; Eliot Station, Jamaica.
1861 - Gale Group | SAS Part 1
... the presence/absence of a LOng RAnge Navigation (LORAN) system. Hookah divers caught a daily average of ... catch level that fulfills daily economic expectations. Both LORAN and non-LORAN vessels preferred to work the nearest ground to ... effects of vessel type and fishing ground, with LORAN vessels having significantly higher catch rates and tending ... more effort to distant grounds than vessels without LORAN. GLM performed by species corroborated that Friday was ... la presencia/ausencia del sistema de posicionamiento global LORAN. Los desembarques diarios constaron de cuatro especies en ...
Tópico(s): Marine Bivalve and Aquaculture Studies
2001 - EDP Sciences | Aquatic Living Resources
Clifford Webb Motoring Correspondent, Miles Kington, J. R. Anderson, Allan Boesak, Alan Gibson, S. C. Bedford, Frank Johnson, Executive Editor Kenneth Fleet, Peter Marson, Geraldine Norman, Sale Room Correspondent, Ronald Faux, Ivo Tennant, Philip Howard, Hilary Finch, David Smith, Michael Binyon, P. C. Warner, President, Martha Honey, San José, Costa Rica, John Best, Clifford Longley Religious Affairs Correspondent, Michael McCarthy, Geoffrey Smith, D. P. E. Smart, Stephen Taylor, Peter Davenport, Peter Jones, Bill Johnstone Technology Correspondent, Peter Ball, Lawrence Lever, Anthony Bevins Political Correspondent, Peter Ackroyd, Carlos de Serpapimentel, Robin Young, Robert Nye, Jenny MacArthur, Elaine Feinstein, B. J. Ashwell, Peter Nichols, Michael Hamlyn, Diana Geddes, Hugh Clayton, Environment Correspondent, Woodrow Wyatt, Jeremy Warner Business Correspondent, Richard Thomson, Banking Correspondent, John Hennessy, Harry Debelius, David Smith, Economics Correspondent, David Miller, (Michael Phillips), John Higgins, Alison Eadie, Gareth Huw Davies, Peter Davalle, Christopher Mosey, Paul Griffiths, Charles Harrison, Michael Pollard, Nicholas Ashford, Diplomatic Correspondent, PHS, Richard Owen, Stewart Tendler, Crime Reporter, Barry Pickthall, Irving Wardle, Nick Thornely, Ronald Butt, Sheila Gunn Political Staff, Derek Harris, Industrial Editor, Keith MacKlin, David Hands Rugby Correspondent, Philip Nicksan, Hugh Clayton, Christopher Walker, Edward Townsend, Industrial Correspondent, Judith Huntley, Michael Hornsby, Michael Seely, John Newall, Peter Baelz, Kathleen M. Dunabin, David Walker, Graham Searjeant, Godfrey Golzen, John Woodcock, Cricket Correspondent, Christopher Follett, Nicholas Shakespeare, Richard Morrison, Richard Lander, Sarah Hogg and David Watts, Edward du Cann, President, Joseph A. Keller, Manager, Richard Wigg, M. G. G. Pillai, Richard Williams,
... Limited Michael Page Partnership Universal Computer Associates Ltd "Loran-C" Project Manager Caltech Industries International Computers Limited ...
1986 - Gale Group | TDA
Arnold H. Boer, Gerald Redmond, T. J. Pettigrew,
We used an electronic long-range navigation aid (LORAN-C) in an aerial survey for moose (Alces ... increased efficiency and accuracy of aerial surveys make LORAN-C an important navigational tool for wildlife managers ... and the Great Lakes are well serviced by LORAN-C transmitters (Patric et al. 1988). More recently, LORAN-C has become a popular navigational aid in aircraft. We report on the use of LORAN-C as a navigational tool to conduct aerial ... Ltd., Fredericton, New Brunswick provided pilots and the LORAN-C unit. We appreciate the helpful comments of ...
Tópico(s): Wildlife-Road Interactions and Conservation
1989 - Wiley | Journal of Wildlife Management
Terence Reese, Donald Mitchell, Harold Wilshaw, A. G. Guest, E. M. Eppel, Stevie Smith, Kenneth Glyn Jones, K. W. Gransden, Roger Cary, Patrick Smith B. B. C., Ivor Brown, Ian Rodger, George Scott, Richard Wollheim, J. M. Cameron, Geoffrey Gorer, Walter Humphries, Hesketh Pearson, Spider, J. H. Grainger, Hilary Corke, Federico Clark, Claire Rayner, Sir Walter Puckey, James Aitchison, N. J. Arnold, Erik De Mauny B. B. C., George Dickson, Francis Watson, James Kirkup, Winton Dean, Frances A. Yates, J. R. Ackerley, Andrew Cruickshank, Scott Goddard, David Paul, Harold Franklin, Patrick Moore, Manya Harari, Alan Clutton-Brock,
... s Book Chronicle A Prison, a Paradise By Loran Hurnscot. Gollancz. 21s. In the Listener last week ...
1959 - Gale Group | The Listener GDA
Benjamin Peterson, Richard J. Hartnett, Dean Bruckner, REBECCA HEATHERINGTON, Ralf Fiedler,
... paper summarizes the need for integrating GPS and LORAN-C (hereafter simply termed LORAN). Assuming that LORAN increasingly serves as a backup for GPS in ... years, two scenarios for this new role of LORAN are presented. Improvements to LORAN for this new role are then outlined. Beginning ... existing accuracies of C/A-code GPS and LORAN, two Kalman filter-based integrated receiver structures are ... A newer receiver architecture is summarized. Improvements to LORAN to make it a better backup for GPS ...
Tópico(s): Maritime Navigation and Safety
1998 - Wiley | NAVIGATION Journal of the Institute of Navigation
Kate Taylor, Andrew Robson, Peter Klinger and Jon Ashworth, Robert Sturdy, Robert Cole, Andrew Pierce, DJM, Sarah Potter, Robert Thicknesse, Mark Souster, Robert Molton, Richard Hobson, Ivo Tennant, Michael Evans Defence Editor, Dan Maddicott, Philip Howard, Lucia Van der Post, Christine Seib, David Chater, James Ducker, Rachel Campbell-Johnston, Nic Hopkins, Clive Davis, Bronwen Maddox Foreign Editor, Richard Irving, Catherine Riley Property Editor, Bob Stanley, Sam Marlowe, Kevin Eason, Paul McGuinness, Geoff Brown, Sam Lister, David Sharrock, Ben Webster Transport Correspondent, Pat Gibson, Brian N. Dancer, Gordon Miller, Dominic Walsh, Tom Bawden, James Doran Wall Street Correspondent, Gary Jacob, Nick Hopkins, Steven Johnson, Jill Dupleix, Tim Reid, Dan Sabbagh, Michael Howard and Tony Blair, Alan Hamilton, A. J. Lewis, Roland Watson, Richard Lloyd Parry, Charles Bremner, Matt Dickinson Chief Football Correspondent, Douglas M. Hendry, Tony Dixon, Angela Jameson, John Price, Tony Halpin Education Editor, Jerome Burne, Gary Duncan Economics Editor, Oliver Kay, Gerard Baker, Nicole Swengley, Sarah Vine, John Westerby, Tom Baldwin, Jill Sherman Whitehall Editor, Sam Coates, Mark Henderson Science Correspondent, Ann Treneman, Rob Wright, Geoffrey Dean, Neil Harman Tennis Correspondent, Raymond Keene, Martin Rennew, Matthew Pryor, Amanda Holloway, Christine Buckley Industrial Editor, John Whysall, Jeremy Page, Neville Scott, Burhan Wazir, Chris Campling, Tricia Hilder, Derek Hornby, Richard Owen, Christopher Martin-Jenkins Chief Cricket Correspondent, Mick Hume, Roger Boyes, David Mattin, Alastair Walker, David Lipsey, Nick Hasell, Tom Baldwin and Philip Webster, James Michels, Stewart Tendler, Dalya Alberge, Helen Rumbelow Frances Gibb and Daniel McGrory, Tom Dart, Julian Muscat, Paul Simons, John Allison, Nick Szczepanik, Jessie Yapp, Mary Ann Sieghart, James Bone and Elaine Monaghan, John Stamford, Jane Shilling, Mel Webb, Graham Searjeant Financial Editor, Richard Corbert, Alistair Cooke, George Caulkin, Michael Austin, Peter Riddell, Richard Beeston, Philip Webster, Ian Whittell, David Sinclair, Antony Walker, Mark Henderson, Catherine Philp, Martin Waller, Loran Blackwood, Ashling O'Connor, Benedict Nightingale, Oliver Kamm, Angus Batey, Stuart Birch, Dr Thomas Stuttaford, Stephen Dalton, Ben Hoyle, Leo Lewis, Richard Morrison, Adam Sherwin, Sarah Vina, Owen Slot, James Lyall, Jenny Davey, Peter Klinger, Sam Lister Health Correspondent, Patience Wheatcroft, Christopher Irvine,
Blair backs shop ban on 'hoodies' McCartney threat Turkey trial ruling Bricks and Mortar Sweet deal Pensions hope 'France will decide how long Tony Blair ...
2005 - Gale Group | TDA
Per Enge, James R. McCullough,
... signal integrity unless some external aid is used. Loran-C can be used effectively to aid GPS. A hybrid receiver can combine Loran lines of position with GPS lines of position ... with great integrity, reliability, and time availability. Indeed, Loran is independent of GPS and can be used ... failures. However, the hybrid receivers must include sophisticated Loran propagation models, which account for both the spatial ... real time. This paper reviews the theory of Loran propagation and gives a basic Loran pseudorange model. ...
Tópico(s): GNSS positioning and interference
1988 - Wiley | NAVIGATION Journal of the Institute of Navigation
Sherman Lo, Benjamin Peterson, Tim Hardy, Per Enge,
Enhanced Loran ( eLoran ) is currently being implemented to provide back up to global navigation satellite systems (GNSS) in many ... throughout its desired coverage area. While the current Loran system is generally capable of accomplishing this, worldwide, ... which are significantly shorter than those at a Loran station. Recent tests at the US Coast Guard Loran Support Unit (LSU) demonstrated the performance of a ... a navigation signal that is compatible with the Loran system and the potential DPGS broadcast (when using ...
Tópico(s): Radio Wave Propagation Studies
2009 - Cambridge University Press | Journal of Navigation
Sherman Lo, Benjamin D. Peterson, Per Enge, Peter F. Swaszek,
Loran has provided navigation service since 1958. Though not originally designed with data broadcast capabilities, Loran's versatility has enabled data to be broadcast ... a tremendous increase in the data capacity of Loran thereby increasing its utility. Currently, a modernized Loran is being evaluated for its capability to backup ... data modulation is an integral part of this Loran design. This paper details some recent Loran modulation designs and ideas.
Tópico(s): Radio Wave Propagation Studies
2007 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Aerospace and Electronic Systems
Sherman Lo, Benjamin Peterson, Per Enge,
Loran has provided navigation service since 1958. Though not originally designed with data broadcast capabilities, Loran's versatility has enabled data to be broadcast ... a tremendous increase in the data capacity of Loran thereby increasing its utility. Currently, a modernized Loran is being evaluated for its capability to backup ... data modulation is an integral part of this Loran design. An overview and analysis of Loran modulation techniques is provided.
Tópico(s): Radio Wave Propagation Studies
2007 - Institute of Electrical and Electronics Engineers | IEEE Aerospace and Electronic Systems Magazine
W. David Rust, Donald W. Burgess, Robert A. Maddox, Lester C. Showell, T. C. Marshall, Dean Lauritsen,
We have tested the NCAR Cross-Chain LORAN Atmospheric Sounding System (CLASS) in a fully mobile configuration, which we call M-CLASS. The sondes use LORAN-C navigation signals to allow calculation of balloon ... quantitative assessment of conditions that accompany loss of LORAN data. LORAN tracking was lost at a median field of ... about 7 kV/m. Corona discharge from the LORAN antenna on the sonde was a cause of the loss of LORAN. We provided our early-afternoon M-CLASS test ...
Tópico(s): Ionosphere and magnetosphere dynamics
1990 - American Meteorological Society | Bulletin of the American Meteorological Society
Per Enge, Frona B. Vicksell, ROBERT B. GODDARD, Frank van Graas,
User equipment that combines pseudoranges from GPS and Loran would be more reliable than an unaided GPS receiver or a Loran-only receiver. It could remove coverage outages caused ... remove most of the coverage outages caused by Loran station shutdowns, high atmospheric noise levels, or precipitation static. A hybrid GPS/Loran receiver could also reliably provide self-contained fault ... includes the effects of satellite as well as Loran station shutdowns. Finally, our analysis examines whether it is important to synchronize Loran transmissions to GPS time.
Tópico(s): Power Line Communications and Noise
1990 - Wiley | NAVIGATION Journal of the Institute of Navigation
... cm intervals of root, stem and petiole. Cultivars Loran Blood and Moscow showed resistance to disease expression ... the HP and HF strains; the ‘resistance’ of Loran Blood and Moscow was no longer apparent and ... susceptibilities to the strains were HF Bonney Best > Loran Blood > Potentate > Moscow, HP Bonny Best > Loran Blood, Moscow > Potentate, T Bonny Best > Potentate > Loran Blood, Moscow. In general, vascular colonization was less in the cultivars Loran Blood and Moscow with all three fungal strains ... colonization. Contrary to previous reports the resistant varieties Loran Blood and Moscow developed acute disease symptoms after ...
Tópico(s): Powdery Mildew Fungal Diseases
1969 - Wiley | Annals of Applied Biology
the main computational requirement for LORAN navigation systems is the transformation to geographic latitude and longitude of time difference measurements made by the LORAN receiver. It is desirable to maintain a computational ... arc to avoid degradation of the inherently attainable LORAN system accuracy. It is therefore necessary to take ... a derivation and discussion of an explicit, noniterative, LORAN mechanization of very high accuracy (approximately one second ... is required. This provides for a self-sufficient LORAN system. 2. Perfect computational repeatability is achieved. 3. ...
Tópico(s): Radio Wave Propagation Studies
1967 - Wiley | NAVIGATION Journal of the Institute of Navigation
Wenhe Yan, Kunjuan Zhao, Shifeng Li, Xinghui Wang, Yu Hua,
The Loran-C system is an internationally standardized positioning, navigation, and timing service system. It is the most important ... global navigation satellite system (GNSS). However, the existing Loran-C signal acquisition methods are easily affected by ... also verified by actual signals emitted by a Loran-C system. These test results show that our method can reliably detect Loran-C pulse group signals over distances up to ... at low SNR. This will enable the modern Loran-C system to be a more reliable backup ...
Tópico(s): Precipitation Measurement and Analysis
2020 - Multidisciplinary Digital Publishing Institute | Sensors
Joseph J. Pisano, Per Enge, Peter Levin,
... techniques for using simultaneous Global Positioning System (GPS)/Loran data to estimate the propagation uncertainties that limit the absolute accuracy of Loran-C are discussed. Significant improvements in the absolute accuracy of Loran can be achieved with very simple calibrations. The absolute accuracy of Loran in the Gulf of Maine without calibration is ... Simple calibrations greatly improve the absolute accuracy of Loran. As shown, if the land conductivities are fixed ...
Tópico(s): Optical Wireless Communication Technologies
1991 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Aerospace and Electronic Systems
Loran-D is a highly accurate pulsed hyperbolic navigation system similar to and compatible with Loran-C, but designed for military tactical use. The ... technology. A signal range over half that of Loran-C is achieved by the fortunate propagation characteristics ... and Europe are described. The potential uses of Loran-D include: gap filler in Loran-C coverage, a transportable survey system, and long ...
Tópico(s): Radio Wave Propagation Studies
1974 - Wiley | NAVIGATION Journal of the Institute of Navigation
R. E. Doherty, G. Hefley, Robert F. Linfield,
The Loran-C navigation system is capable of synchronizing and setting clocks to a relative accuracy of better than ... μsec throughout the system's service area. A Loran-C receiver functions as a slaved oscillator and ... fundamental relationship between time and position is considered. Loran-C as a navigation and timing system can ... both position and time simultaneously. The East Coast Loran-C chain will be time synchronized. The national ... results of ground wave measurements made on the Loran-C (Cytac) system. Appendix II describes the results ...
Tópico(s): Radio Wave Propagation Studies
1961 - Institute of Electrical and Electronics Engineers | Proceedings of the IRE
Rami Al‐Jafar, Maria Zografou Themeli, Sadia Zaman, Sharmin Akbar, Victor P. F. Lhoste, Ahlam Khamliche, Paul Elliott, Konstantinos K. Tsilidis, Abbas Dehghan,
... blood pressure must be determined. Methods and Results LORANS (London Ramadan Study) is an observational study, systematic review, and meta‐analysis. In LORANS, we measured systolic blood pressure (SBP) and diastolic ... effect from these studies and unpublished data from LORANS. We included observational studies that measured SBP and/ ... International Prospective Register of Systematic Reviews; CRD42019159477). In LORANS, 85 participants were recruited; mean age was 45. ...
Tópico(s): Optimism, Hope, and Well-being
2021 - Wiley | Journal of the American Heart Association
Jiangbin Yuan, Wenhe Yan, Shifeng Li, Yu Hua,
Loran-C is the most important backup and supplement system for the global navigation satellite system (GNSS). However, existing Loran-C demodulation methods are easily affected by noise ... this article proposes a demodulation method based on Loran-C pulse envelope correlation–phase detection (EC–PD), ... This will improve the performance of the modern Loran-C system, making it a more reliable backup ...
Tópico(s): Power Line Communications and Noise
2020 - Multidisciplinary Digital Publishing Institute | Sensors
Pyo-Woong Son, Sul Gee Park, Younghoon Han, Ki-Yeol Seo,
... on it for navigation. Compared to GNSS, enhanced Loran (eLoran) is more resistant to jamming and is ... within a 30-km coverage of a differential Loran station. In this paper, we describe the development ... we installed an eLoran transmitter and two differential Loran stations and subsequently conducted a zero-baseline performance test at the Pyeongtaek differential Loran station with a new eLoran signal. We also conducted a survey to collect conventional Loran signals along the western and southern coastlines of ...
Tópico(s): GNSS positioning and interference
2020 - Institute of Electrical and Electronics Engineers | IEEE Access