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Online Parameter Estimation Under Non-Persistent Excitations For High-Rate Dynamic Systems, Jin Yan, Simon Laflamme, Jonathan Hong, Jacob Dodson 2021 Iowa State University and Palo Alto Research Center

Online Parameter Estimation Under Non-Persistent Excitations For High-Rate Dynamic Systems, Jin Yan, Simon Laflamme, Jonathan Hong, Jacob Dodson

Civil, Construction and Environmental Engineering Publications

High-rate dynamic systems are defined as systems experiencing dynamic events of typical amplitudes higher than 100 gn for a duration of less than 100 ms. They are characterized by 1) large uncertainties on the external loads; 2) high levels of nonstationarity and heavy disturbance; and 3) generation of unmodeled dynamics from changes in mechanical configuration. To fully enable these systems, feedback capabilities must be developed. This includes computationally fast software and low latency hardware. This paper presents a pure time-based online parameter estimation algorithm for high-rate dynamic systems with real-time applicability. The algorithm is based on a model reference ...


Issue 9: Contributors, D. Flournoy, Randall Johnson 2021 Ohio University

Issue 9: Contributors, D. Flournoy, Randall Johnson

Online Journal of Space Communication

List of issue 9 contributors.


Gps & Galileo: Prospects For Building The Next Generation Of Global Navigation Satellite Systems, Glen Gibbons Jr. 2021 Ohio University

Gps & Galileo: Prospects For Building The Next Generation Of Global Navigation Satellite Systems, Glen Gibbons Jr.

Online Journal of Space Communication

In the next 5 to 10 years, the world will experience the emergence of a true Global Navigation Satellite System (GNSS) - a compatible and, in many respects, interoperable system of systems. The U.S. Global Positioning System, Europe's Galileo, perhaps Russia's Glonass system, and regional augmentations including the Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay Service (EGNOS), radiobeacon-based systems such as the U.S. Nationwide Differential GPS, and compatible commercial differential correction services will comprise this multifaceted GNSS. Common signal structures and frequency plans will enable combined user equipment that reduces the technical complexity and ...


New U.S. Gps Policy From A European Perspective, Martin U. Ripple, Alexis Vidal 2021 Ohio University

New U.S. Gps Policy From A European Perspective, Martin U. Ripple, Alexis Vidal

Online Journal of Space Communication

On December 8, 2004, the President of the United States of America authorized the new U.S. Space-based Positioning, Navigation and Timing Policy. This new policy sets forth a forward-looking framework for the management of GPS and its augmentations. In particular, the new U.S. policy mentions interaction with other satellite navigation systems.

Following the establishment of a U.S.-E.U. framework agreement for cooperation between GPS and Galileo, signed on June 26, 2004, European policy makers and industrialists expected clear statements on cooperation and interoperability issues from the new U.S. GPS policy. Regrettably, the related recommendations hold ...


Receiver Performance For An Enhanced Dgps Data Channel, Gregory Johnson, Michael Kuhn, Peter F. Swaszek, Richard Hartnett, Per Enge 2021 Ohio University

Receiver Performance For An Enhanced Dgps Data Channel, Gregory Johnson, Michael Kuhn, Peter F. Swaszek, Richard Hartnett, Per Enge

Online Journal of Space Communication

The Coast Guard currently operates a maritime differential GPS service consisting of two control centers and over 85 remote broadcast sites. This service broadcasts GPS correction information on marine radiobeacon frequencies to improve the accuracy and integrity of GPS. The existing system provides differential corrections over a medium frequency carrier using minimum shift keying (MSK) as the modulation method. MSK is a version of the Continuous Phase Frequency Shift Keying (CPFSK) modulation technique that is "spectrally compact," meaning that it is a narrow band modulation scheme. In a binary signaling channel, the two instantaneous frequencies for this modulation method are ...


Space Based Real-Time Kinematic Gps For National Geodetic Survey Texas Height Modernization, S. D. Lyle, D. M. Mulcare 2021 Ohio University

Space Based Real-Time Kinematic Gps For National Geodetic Survey Texas Height Modernization, S. D. Lyle, D. M. Mulcare

Online Journal of Space Communication

Height Modernization is a program in NOAA's National Geodetic Survey (NGS) that uses the Global Positioning System (GPS) and other new technologies to increase the accuracy of elevation measurements that comprise the vertical portion of the National Spatial Reference System (NSRS). Height Modernization Program within NGS is working with states to improve the height component of their survey control networks and related products. Texas A&M University- Corpus Christi (A&M-CC) was designated as the recipient of a grant under the Program during the most recent Congressional cycle. In order to best coordinate and manage the activities funded by ...


Sea Surface Wave Information Using Gps Sea Reflected Signal - Wave Height, Shigeyuki Okuda, Yasuo Arai, Nobuyoshi Kouguchi 2021 Ohio University

Sea Surface Wave Information Using Gps Sea Reflected Signal - Wave Height, Shigeyuki Okuda, Yasuo Arai, Nobuyoshi Kouguchi

Online Journal of Space Communication

In case of positioning by GPS, the direct signal from the satellite to the receiver is ordinarily utilized, but the multipath signal is regarded as one error source that deteriorate the positioning accuracy. In this paper, we focus on characteristics of the reflected signal, and had a few simulation tests. The correlator output signals are checked out and compared to the change of wave height and the wave period.

In this paper we describe that in sufficient long wave compared with reflection area size we can measure an accurate wave height, and by pointing antenna beam center from two directions ...


Moving Map And Situational Awareness Capabilities Of The Dagr, Gary L. Bachman 2021 Ohio University

Moving Map And Situational Awareness Capabilities Of The Dagr, Gary L. Bachman

Online Journal of Space Communication

This paper presents an overview of the Moving Mapp and Situational Awareness capabilities of the Defense Advanced GPS Receiver (DAGR) military handheld GPS receiver (refer to Figure 1), and how these capabilities can be utilized for other applications. The paper first presents an overview of situational awareness and moving maps as provided by handheld GPS receivers, factors driving the DAGR's requirements, and the requirements themselves.

This paper presents the system design in a two-part approach corresponding to the two primary components of the system: 1) importing digital map products into the DAGR and 2) displaying moving maps and situational ...


Egnos Terrestrial Regional Augmentation Networks Based On Ais For River Information Services, M. Jandrisits, J. C. de Mateo, G. Abwerzger 2021 Ohio University

Egnos Terrestrial Regional Augmentation Networks Based On Ais For River Information Services, M. Jandrisits, J. C. De Mateo, G. Abwerzger

Online Journal of Space Communication

Within the ESA Advanced Research Telecommunications program ARTES-5, the project GALEWAT (Galileo and EGNOS for Waterway Transport) aims at introducing EGNOS into River Information Services (RIS) through the Automatic Identification System (AIS), a link that is mandatory for seagoing vessels above 300 GT.

The GALEWAT project comprises several phases: During the initial definition phase, the system architecture and user equipment have been defined in line with standards and international recommendations. This phase was followed by the implementation phase, aiming at developing and setting up the equipment. Finally, the project will be completed by an extensive demonstration phase, which is currently ...


Geosynchronous Satellite Use Of Gps, Jennifer L. Ruiz, Charles H. Frey 2021 Ohio University

Geosynchronous Satellite Use Of Gps, Jennifer L. Ruiz, Charles H. Frey

Online Journal of Space Communication

The purpose of this study was to determine the accuracy of GPS use for a geosynchronous (GEO) satellite. Current missions at GEO altitude mainly use traditional ranging for orbit determination. With changing mission requirements and the increase in the number of GEO missions, utilizing GPS signals is becoming an increasingly attractive alternative for position and timing determination. A previous ION paper discusses the use of GPS data for a particular geosynchronous satellite mission and is included here as a reference. GPS use at GEO is primarily limited by the availability of the spillover from the GPS earth coverage signal. The ...


Galileo In Bavariansky - Network Of Excellence In Satellite Navigation, Bärbel Deisting 2021 Ohio University

Galileo In Bavariansky - Network Of Excellence In Satellite Navigation, Bärbel Deisting

Online Journal of Space Communication

The building up of the European satellite navigation system Galileo with its new services, the guaranteed reliability and continuity as well as the interoperable and complementary relation to GPS is expected to open new markets for satellite navigation applications all over the world. Many sectors will benefit from Galileo as the range of application is varied and an exponential grow is being expected for fields related to the development of satellite navigation.

During the last years several examinations dealing with satellite navigation sector in Bavaria have been carried out. The analyses revealed that satellite navigation signals serve as basis for ...


Sensing Ocean, Ice And Land Reflected Signalsfrom Space: Results From The Uk-Dmc Gps Reflectometry Experiment, Scott Gleason, Mounir Adjrad, Martin Unwin 2021 Ohio University

Sensing Ocean, Ice And Land Reflected Signalsfrom Space: Results From The Uk-Dmc Gps Reflectometry Experiment, Scott Gleason, Mounir Adjrad, Martin Unwin

Online Journal of Space Communication

The use of Global Navigation Satellite System (GNSS) signals reflected from the Earth's surface has progressed from its beginnings in the early 1990's to a demonstrated practical linkage of measurements to geophysical characteristics of ocean, ice and land surfaces.

A pioneering space-based experiment was carried on the UK-DMC satellite launched in September of 2003. The GPS receiver on the satellite was modified to accommodate a downward (nadir) pointing medium gain antenna and to send sampled IF data to a solid-state data recorder [1]. Since its launch it has been successfully used to target and detect specular reflections of ...


Implementation Of A Positioning And Telemetry Buoy To Determine Chart Datum For Hydrographic Survey Applications, Elliot N. Arroyo-Suarez, Deborah L. Mabey, Vic Hsiao, Reo Phillips 2021 Ohio University

Implementation Of A Positioning And Telemetry Buoy To Determine Chart Datum For Hydrographic Survey Applications, Elliot N. Arroyo-Suarez, Deborah L. Mabey, Vic Hsiao, Reo Phillips

Online Journal of Space Communication

The Naval Oceanographic Office (NAVOCEANO) and the U. S. Navy’s Fleet Survey Team (FST) conduct worldwide hydrographic surveys in accordance with International Hydrographic Organization (IHO) S-44
standards. The current concept of operations (CONOPS) requires that tide gauges be installed in-shore to define the local vertical chart datum. This requires clearances and permissions from national and local authorities as well as landowners in order to establish and access these shore stations. Substantial effort to establish and maintain
security for shore parties and equipment left behind is also required. The recent implementation of real-time Global Differential GPS (GDGPS) point positioning
technology ...


Galileo In Maritime Applications, Stig Erik Christiansen, John Klepsvik, Michael Fairbanks, Alan Grant, Nick Ward, Marko Jandrisits 2021 Ohio University

Galileo In Maritime Applications, Stig Erik Christiansen, John Klepsvik, Michael Fairbanks, Alan Grant, Nick Ward, Marko Jandrisits

Online Journal of Space Communication

The past decade has seen the continued growth of GPS and its many different applications. The European Union and the European Space Agency has announced the development of the European Global Navigation Satellite System - Galileo. Clearly acceptance of additional satellite systems into markets that successfully use GPS will require identification of those key areas where Galileo is capable of providing added-value, either standalone or more likely as a component of an overall integrated suite of navigation systems. These key areas are often termed the key differentiators for Galileo.

This paper introduces three projects; GALEWAT, MARGAL and GEM. The GALEWAT project ...


Range-Extended Post-Processing Kinematic (Ppk) In A Marine Environment, Marcelo Santos, Felipe Nievinski, Karen Cove, Robert Kingdon, Dave Wells 2021 Ohio University

Range-Extended Post-Processing Kinematic (Ppk) In A Marine Environment, Marcelo Santos, Felipe Nievinski, Karen Cove, Robert Kingdon, Dave Wells

Online Journal of Space Communication

We have been investigating the extension in range of baselines used in support to marine applications. Our focus has been with PPK (post-processing kinematic) following the Remondi's lemma: "it is better to have a reliable float ambiguity resolution rather than a wrongly fixed ambiguity." We have focused our attention on the residual effect due to differential troposphere. Our investigation makes use of data sets collected under the scope of the Princess of Acadia Project.

In this paper, we focus on a storm know as the 2004 Halifax weather bomb. Zenith tropospheric delays have been compared for that time period ...


Helicopter Ship Board Landing System, Tom Ford, Mark Hardesty, Mike Bobye 2021 Ohio University

Helicopter Ship Board Landing System, Tom Ford, Mark Hardesty, Mike Bobye

Online Journal of Space Communication

Relative navigation of an aircraft (fixed wing or helicopter) close to ships at sea is a unique navigation problem. Shipboard helicopter operations provide a difficult operational environment. Wind over deck and wake turbulence shed by ship super structure offer challenging and unpredictable conditions during takeoff and landing. This is especially true in the operational environment that includes sea-state six, with its associated twenty-foot waves and thirty-three knot winds. Anything other than calm seas can create pitch, roll, yaw, and heave of the landing platform. Different sea going vessels behave in a variety of ways due to their size, hull design ...


The Giant Project, Luis Chocano, Javier Pérez, Miguel Aguilera 2021 Ohio University

The Giant Project, Luis Chocano, Javier Pérez, Miguel Aguilera

Online Journal of Space Communication

As the European satellite navigation programme moves forward, with EGNOS as the first step towards Galileo, the user community finds out the potential benefits that the GNSS-based applications can provide to the different economic areas of society. The aviation sector, which has played a decisive role in the specification of these systems, can obtain significant advantages by means of the combined use of GNSS (Global Navigation Satellite Systems) systems, once the technical, operational and regulatory problems are overcome.

This paper describes the activities that are planned in the context of the GIANT project, the organization of the proposed work and ...


Space Communication And Aviation Navigation: The United States Moves Towards Performance-Based Navigation, Hank Cabler, Jeff Williams 2021 Ohio University

Space Communication And Aviation Navigation: The United States Moves Towards Performance-Based Navigation, Hank Cabler, Jeff Williams

Online Journal of Space Communication

The U.S. NAVSTAR GPS communications satellite network, integrated with the FAA's Wide Area Augmentation System, or WAAS, provides improvements in GPS accuracy and integrity for aviation navigation throughout the U.S. National Airspace System. WAAS has allowed the FAA to move toward a performance-based NAS, exploiting the concept of "required navigation performance," or RNP. The FAA, in cooperation with aviation stakeholders, is implementing performance-based navigation in the U.S. NAS. Two key components of performance-based navigation are Area Navigation (RNAV) and RNP. These components allow the flexibility to design more efficient airspace and instrument procedures that improve safety ...


Navigation Errors Introduced By Ground Vehicle Dynamics, William Travis, David M. Bevly 2021 Ohio University

Navigation Errors Introduced By Ground Vehicle Dynamics, William Travis, David M. Bevly

Online Journal of Space Communication

An analysis of navigational accuracy when influenced by ground vehicle dynamics is presented. Tests beds outfitted with various sensor suites were used to collect data when normal and extreme driving maneuvers are executed. The data was run through an extended Kalman filter to produce a navigation solution. The Kalman filter inputs varied on each test bed, using both automotive and tactical grade Inertial Measurement Units (IMU). The position, velocity, and course measurements were obtained from a DGPS unit mounted on the vehicles and used as a truth measurement when exploring dead reckoning error. Additional measurements, such as wheel speed, radar ...


Intelligent In-Vehicle Device Based On Arm-Linux Techniques, Xiaoqing Yue, Qishan Zhang, Qing Chang 2021 Ohio University

Intelligent In-Vehicle Device Based On Arm-Linux Techniques, Xiaoqing Yue, Qishan Zhang, Qing Chang

Online Journal of Space Communication

A new Intelligent Transportation System (ITS) is introduced and some ideas about instruction trigger position (ITP) are presented. The design of terminal devices based on an embedded ARM-Linux system in vehicles is presented in detail, including the design and development of both hardware and software.


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