Results 101 to 110 of about 146,803 (321)

Modelling the Four‐Dimensional Power Line Sag Dynamics by Point Signature in Time‐Series Synthetic‐Aperture Radar Images

High Voltage, EarlyView.
ABSTRACT Power lines in synthetic‐aperture radar (SAR) images are reflected as point signatures, which fluctuate annually in both the azimuth and range directions. A novel framework is proposed in this paper to evaluate the four‐dimensional dynamic status of power line sag using those point signatures in time‐series SAR images.
Sijie Ma, Tao Li, Mahdi Motagh, Yan Liu, Yangmao Wen   +4 more
wiley   +1 more source

National BDS Augmentation Service System (NBASS) of China: Progress and Assessment

Remote Sensing, 2017
: In this contribution, the processing strategies of real-time BeiDou System (BDS) precise orbits, clocks, and ionospheric corrections in the National BDS Augmentation Service System (NBASS) are briefly introduced.
Chuang Shi, Fu Zheng, Yidong Lou, Shengfeng Gu, Weixing Zhang, Xiaolei Dai, Xianjie Li, Hailin Guo, Xiaopeng Gong   +8 more
doaj   +1 more source

Facilitating macrosystem biology with organismal‐scale airborne remote sensing: Challenges and opportunities

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Emergent ecosystem properties, such as population and trait distributions, biodiversity and energy and water fluxes, occur because of the dynamic interactions of individuals in their environment.
Sarah J. Graves, Ritesh Chowdhry, Meilun Zhou, Ira Harmon, Ben Weinstein, S. K. Morgan Ernest, Alina Zare, Ethan P. White, Stephanie A. Bohlman   +8 more
wiley   +1 more source

Analysis of Multipath Mitigation Techniques with Land Mobile Satellite Channel Model [PDF]

, 2012
Multipath is undesirable for Global Navigation Satellite System (GNSS) receivers, since the reception of multipath can create a significant distortion to the shape of the correlation function leading to an error in the receivers’ position estimate.
Bhuiyan M. Z. H., Lohan, E. S., Sand, S., Wang, W., Zhang, J.   +4 more
core   +1 more source

Managing the Threat of Subsidized Predators for a Threatened Shorebird

Animal Conservation, EarlyView.
Subsidized predators—native predators that have become more common due to human activities—challenge the persistence of many at‐risk prey species and require creative solutions beyond lethal predator control. In an 8‐year study, we placed small wire cages over western snowy plover nests that allow passage of plovers, but not their predators, and ...
R. R. Swaisgood, R. L. Smith, J. G. Schuetz, T. Wooten, L. I. Vilchis   +4 more
wiley   +1 more source

Toward a unified PNT, Part 1: Complexity and context: Key challenges of multisensor positioning [PDF]

, 2014
The next generation of navigation and positioning systems must provide greater accuracy and reliability in a range of challenging environments to meet the needs of a variety of mission-critical applications.
Groves, PD, Martin, H, Voutsis, K, Walter, D, Wang, L   +4 more
core  

Environmental sensing using GNSS interferometric reflectometry (GNSS-IR)

, 2023
GNSS interferometric reflectometry (GNSS-IR) is an environmental sensing method that was initially developed to take advantage of reflected signals (multipath) collected by geodetic-quality GNSS equipment. Unlike most geodetic studies of multipath, where the goal is to correct carrier phase data, GNSS-IR uses Signal to Noise Ratio (SNR) data.  The
Larson, K., Williams, S., Dittmann, T., Enloe, K., Karegar, M., Nievinski, F., Purnell, D.   +6 more
openaire   +2 more sources

Assessing the Vulnerability of an Inuit Archaeological Site in a Changing Periglacial Environment: A Novel Multimethod Geophysical Approach in Arctic Geoarchaeology

Archaeometry, EarlyView.
ABSTRACT With northern regions warming at twice the global rate, assessing the state of archaeological sites in these areas is critically important. In this study, we used a multimethod geophysical approach (ERT, GPR, and EMI) to characterize the current geocryological conditions of an Inuit archaeological site on South Aulatsivik Island (Labrador ...
Rachel Labrie, Dominique Todisco, Najat Bhiry, Cécile Finco, Héloïg Barbel Le Page, Armelle Couillet   +5 more
wiley   +1 more source

GNSS-WASP: GNSS Wide Area SPoofing

In this paper, we propose GNSS-WASP, a novel wide-area spoofing attack carried by a constellation of strategicallylocated synchronized transmitters. Unlike known attacks, which are constrained by the attacker’s ability to track victim receivers, GNSS-WASP manipulates the positions measured by all the receivers in a target area without knowing the ...
Tibaldo, Christopher, Sathaye, Harshad, Camurati, Giovanni; id_orcid0000-0003-3510-6895, Capkun, Srdjan; id_orcid0000-0001-5727-3673   +3 more
openaire   +3 more sources

Improved Short-Term Clock Prediction Method for Real-Time Positioning

Sensors, 2017
The application of real-time precise point positioning (PPP) requires real-time precise orbit and clock products that should be predicted within a short time to compensate for the communication delay or data gap. Unlike orbit correction, clock correction
Yifei Lv, Zhiqiang Dai, Qile Zhao, Sheng Yang, Jinning Zhou, Jingnan Liu   +5 more
doaj   +1 more source