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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Land Subsidence Monitoring by Integrating PSI and Geodetic Deformation Measurements
摘要： Leveling provides vertical ground deformation and Global Positioning System (GPS) provides three-dimensional (3-D) deformation with subcentimeter accuracy level, but these measurements are point observations. In order to achieve a high spatial resolution, synthetic aperture radar (SAR) is an effective approach. In particular, Persistent Scatterers Interferometry (PSI) can accurately measure wide range of land subsidence by using multi-temporal SAR images. Thus, in this paper, we will merge the results from PSI and geodetic deformation measurements (GPS and leveling) to estimate the 3-D displacement velocities of Kansai International Airport with high spatial resolution. We apply the least square (LS) approach to combine the interpolated result from GPS and leveling, and estimated results by PSI from SAR images observed on ascending- and descending-orbits. Finally, we compared the estimated results with leveling survey data. The root mean squared error (RMSE) was 18 mm/year, and it was found that the fusion of the results from PSI and geodetic deformation measurements is effective for land subsidence monitoring.
关键词： GPS,land subsidence,PSI,leveling,synthetic aperture radar (SAR)
更新于2025-09-10 09:29:36
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Assessment of improvement of the IRI model over Ethiopia for the modeling of the variability of TEC during the period 2013–2016
摘要： This paper discusses the monthly and seasonal variation of the total electron content (TEC) and the improvement of performance of the IRI model in estimating TEC over Ethiopia during the solar maximum (2013–2016) phase employing as reference the GPS derived TEC data inferred from four GPS receivers installed in di?erent regions of Ethiopia; Assosa (geog 10.05(cid:1)N, 34.55(cid:1)E, Geom. 7.01(cid:1)N), Ambo (8.97(cid:1)N, 37.86(cid:1)E, Geom. 5.42(cid:1)N), Nazret (8.57(cid:1)N, 39.29(cid:1)E, Geom. 4.81(cid:1)N) and Arba Minch (6.06(cid:1)N, 37.56(cid:1)E, Geom. 2.62(cid:1)N). The results reveal that, in the years 2013–2016, the highest peak GPS-derived diurnal VTEC is observed in the March equinox in 2015 over Arba Minch station. Moreover, both the arithmetic mean GPS-derived and modelled VTEC values, generally, show maximum and minimum values in the equinoctial and June solstice months, respectively in 2014–2015. However, in 2013, the minimum and maximum arithmetic mean GPS-derived values are observed in the March equinox and December solstice, respectively. The results also show that, even though overestimation of the modelled VTEC has been observed on most of the hours, all versions of the model are generally good to estimate both the monthly and seasonal diurnal hourly VTEC values, especially in the early morning hours (00:00–03:00 UT or 03:00–06:00 LT). However, it has also been shown that the IRI 2007 and IRI 2012 versions generally perform best in matching the diurnal GPS derived TEC values as compared to that of the IRI 2016 version. In addition, the IRI 2012 version with IRI2001 option for the topside electron density shows the highest overestimation of the VTEC as compared to the other options. None of the versions of the IRI model are proved to be able to capture the e?ects of geomagnetic storms.
关键词： TEC over Ethiopia,TEC during solar maximum,GPS-TEC,IRI-TEC
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Bangalore, India (2018.9.19-2018.9.22)] 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Pulse Oximetry and IOT based Cardiac Monitoring Integrated Alert System
摘要： Heart-related diseases are the leading cause of mortality around the world. There is a substantial need for continuous monitoring of cardiac values as they are a very significant index of one’s health. Conventional methods of measuring heart rate, spo2, and blood pressure values are laborious, prone to errors and usually requires the presence of a physician. This makes nocturnal monitoring impossible. In this project, we offer a modern day, embedded Systems & IoT based solution for continuous and non-invasive measuring of the cardiac values using an upcoming technology known as pulse-oximetry. This technology uses a medical sensor creating a photoplethsmogram from which we can detect the oxygen saturation level and variations in blood volume in the tissues. This analog waveform is further processed using hardware filters to obtain heart rate and Sp02 values. These values are digitized using the A2D converters in the ATmega32 based SoC and are constantly stored and uploaded to the cloud. In case the cardiac values are found to deviate away from the set thresholds, an automated emergency alert system is triggered which uses GSM for automated SOS calls, GPS to track the patient's location and GPRS to make the system truly mobile and wireless. Also, a patient can self-trigger the same alert system by using Google voice assistant on their smart-phone. The end goal of this project is to make a wearable cardiac monitoring and alert system which can be generic or patient specific and help reduce heart-related accidents.
关键词： Photoplethsmogram (PPG),pulse oximeter,GPRS,cardiac parameters: heart rate, sp02,GSM,GPS,Internet of Things (IoT),SoC,OPAMP,wearable health care device
更新于2025-09-09 09:28:46
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[IEEE 2018 15th Workshop on Positioning, Navigation and Communications (WPNC) - Bremen, Germany (2018.10.25-2018.10.26)] 2018 15th Workshop on Positioning, Navigation and Communications (WPNC) - Cooperative Localization in VANETs: An Experimental Proof-of-Concept Combining GPS, IR-UWB Ranging and V2V Communications
摘要： Future applications of Cooperative - Intelligent Transportation Systems (C-ITS) will require accurate and reliable localization capabilities in a variety of harsh operating contexts. In this paper, we account for proof-of-concept field validations of a cooperative localization approach suitable to GPS-enabled Vehicular Ad Hoc Networks (VANETs), which relies on Vehicle-to-Vehicle (V2V) communications (e.g., over ITS-G5) and Impulse Radio - Ultra Wideband (IR-UWB) V2V ranging measurements. First, we evaluate 1-D V2V ranging accuracy on a highway in real mobility conditions. Then, in the same environment, we evaluate the positive impact of cooperation on positioning (i.e., in comparison with standalone standard GPS) in the steady-state fusion regime. Finally, investigating the impact of erroneous initialization and full GPS denial conditions, we illustrate the resilience of the proposed solution, before discussing the limitations of the current evaluation setting.
关键词： GPS,Cooperative Localization,V2V Communications,IR-UWB Ranging,VANETs
更新于2025-09-09 09:28:46
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Automatic Glare Detection via Photometric, Geometric, and Global Positioning Information
摘要： Glare due to sunlight, moonlight, or other light sources can be a serious impediment during autonomous or manual driving. Automatically detecting the presence, location, and severity of such glare can be of critical importance for an autonomous driving system, which may then give greater priority to other sensors or cues/parts of the scene. We present an algorithm for automatic real-time glare detection that uses a combination of: (1) the intensity, saturation, and local contrast of the input frame; (2) shape detection; and (3) solar azimuth and elevation computed based on the position and heading information from the GPS (used under daylight conditions). These data are used to generate a glare occurrence map that indicates the center location(s) and extent(s) of the glare region(s). Testing on a variety of daytime and nighttime scenes demonstrates that the proposed system is effective at glare detection and is capable of real-time operation.
关键词： autonomous driving,photometric,glare detection,geometric,GPS
更新于2025-09-09 09:28:46
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COMPACT CIRCULARLY POLARIZED CROSSED DIPOLE ANTENNA WITH CHIP INDUCTORS AND SQUARE RINGS LOADING FOR GPS APPLICATIONS
摘要： A compact circularly polarized (CP) crossed dipole antenna with chip inductors and square rings loaded for Global Positioning System (GPS) is proposed in this letter. The CP radiation is produced by crossing two dipoles through a 90? phase delay line of a vacant-quarter printed ring. Four chip inductors inserted in the dipole arms and four square rings loaded at the back of the dipole arms are introduced to obtain a compact dipole size. The plane dimension of the proposed antenna is 28 mm × 28 mm, which can be widely used for GPS handheld devices. Details of the proposed antenna design and results are presented and discussed.
关键词： compact circularly polarized,GPS,square rings,chip inductors,crossed dipole antenna
更新于2025-09-04 15:30:14
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Remote Sensing Is Changing Our View of the Coast: Insights from 40 Years of Monitoring at Narrabeen-Collaroy, Australia
摘要： Narrabeen-Collaroy Beach, located on the Northern Beaches of Sydney along the Pacific coast of southeast Australia, is one of the longest continuously monitored beaches in the world. This paper provides an overview of the evolution and international scientific impact of this long-term beach monitoring program, from its humble beginnings over 40 years ago using the rod and tape measure Emery field survey method; to today, where the application of remote sensing data collection including drones, satellites and crowd-sourced smartphone images, are now core aspects of this continuing and much expanded monitoring effort. Commenced in 1976, surveying at this beach for the first 30 years focused on in-situ methods, whereby the growing database of monthly beach profile surveys informed the coastal science community about fundamental processes such as beach state evolution and the role of cross-shore and alongshore sediment transport in embayment morphodynamics. In the mid-2000s, continuous (hourly) video-based monitoring was the first application of routine remote sensing at the site, providing much greater spatial and temporal resolution over the traditional monthly surveys. This implementation of video as the first of a now rapidly expanding range of remote sensing tools and techniques also facilitated much wider access by the international research community to the continuing data collection program at Narrabeen-Collaroy. In the past decade the video-based data streams have formed the basis of deeper understanding into storm to multi-year response of the shoreline to changing wave conditions and also contributed to progress in the understanding of estuary entrance dynamics. More recently, ‘opportunistic’ remote sensing platforms such as surf cameras and smartphones have also been used for image-based shoreline data collection. Commencing in 2011, a significant new focus for the Narrabeen-Collaroy monitoring program shifted to include airborne lidar (and later Unmanned Aerial Vehicles (UAVs)), in an enhanced effort to quantify the morphological impacts of individual storm events, understand key drivers of erosion, and the placing of these observations within their broader regional context. A fixed continuous scanning lidar installed in 2014 again improved the spatial and temporal resolution of the remote-sensed data collection, providing new insight into swash dynamics and the often-overlooked processes of post-storm beach recovery. The use of satellite data that is now readily available to all coastal researchers via Google Earth Engine continues to expand the routine data collection program and provide key insight into multi-decadal shoreline variability. As new and expanding remote sensing technologies continue to emerge, a key lesson from the long-term monitoring at Narrabeen-Collaroy is the importance of a regular re-evaluation of what data is most needed to progress the science.
关键词： Argus,CoastSnap,Google Earth Engine,surfcams,Unmanned Aerial Vehicle,coastal imaging,lidar,RTK-GPS surveys
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design and Analysis of Conformal Antennas for Smart Glasses
摘要： The goal of this communication is to present novel wearable antenna integration in smart glasses. The conformal antennas are optimized to cover the triple frequency bands of mobile communication under -6dB, single band of WiFi and GPS below -10dB reflection coefficient. The measurement of the prototype, created in 3D printing technology, showed good agreement with the numerical simulation. The full wave simulation including the human head phantom exhibited minor effect on the antenna performance. SAR performance of the three antennas is investigated for the smart glasses application in the presence of the head phantom and it respects the corresponding FCC regulation.
关键词： 4G,phantom,conformal,triple band,WiFi,GPS,head,wearable,SAR,antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Reconfigurable Multi-band Antenna for Miniature Tracking Terminal
摘要： This paper proposes a miniature reconfigurable Inverted-F antenna (IFA) covering three different frequency bands. The target application is the Internet of Things (IoT) which requires the use of a miniature antenna to obtain location information using the GPS standard and send it to the server using the Low Power Wide Area Network (LP-WAN) standard.
关键词： GPS standard,Inverted-F antenna,IoT,LoRa standard
更新于2025-09-04 15:30:14