Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Peter J. Speirs"'
Autor:
Peter J. Speirs, Martin Ummenhofer, Christof Schüpbach, Matthias Renker, Peter Wellig, Diego Cristallini, Daniel W. O’Hagan, Michael Kohler, Axel Murk
Publikováno v:
Sensors, Vol 22, Iss 7, p 2766 (2022)
Passive radar is a technology that has huge potential for airspace monitoring, taking advantage of existing transmissions. However, to predict whether particular targets can be measured in a particular scenario, it is necessary to be able to model th
Externí odkaz:
https://doaj.org/article/221594832c8c437a8a3deaf21a38ccf2
Publikováno v:
2021 21st International Radar Symposium (IRS).
The radar signatures of UAVs are critical to both their detection and classification. Simulation provides an excellent method for both augmenting measurements of the radar signature, and for determining properties in cases where measurements are impr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::395563a5fc0d2fcd825ce66d3a4ebf4c
https://doi.org/10.23919/irs51887.2021.9466207
https://doi.org/10.23919/irs51887.2021.9466207
Publikováno v:
2020 14th European Conference on Antennas and Propagation (EuCAP).
A new broad-band vacuum lens/window design is required for the new Atacama Large Millimeter/submillimeter Array (ALMA) band 2 receiver, intended to cover 67-116 GHz. A suitable anti-reflection coating (ARC) for this will be necessary. This paper pres
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67e295e12508126c8727850c1c2cffed
https://doi.org/10.23919/eucap48036.2020.9135970
https://doi.org/10.23919/eucap48036.2020.9135970
Publikováno v:
Journal of Hydrometeorology. 18:1247-1269
The Global Precipitation Measurement (GPM) mission Dual-Frequency Precipitation Radar (DPR) provides a unique set of three-dimensional radar precipitation estimates across much of the globe. Both terrain and climatic conditions can have a strong infl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::484ba2dbefdee5fb570f3801e86a5806
https://doi.org/10.1175/jhm-d-16-0085.1
https://doi.org/10.1175/jhm-d-16-0085.1
Autor:
Peter J. Speirs, Robert I. Hunter, Graham Smith, Duncan A. Robertson, Richard Wylde, Johannes McKay
Publikováno v:
IEEE Transactions on Antennas and Propagation. 64:2518-2522
We demonstrate that very high performance, extremely compact, scalar corrugated feedhorns can be designed and constructed by optimizing the excitation and phasing of the ${\rm HE}_{11}$ , ${\rm HE}_{12}$ , and ${\rm HE}_{13}$ modes near the throat of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f877cdbf5b0e397fe18df0a9bc26252f
https://doi.org/10.1109/tap.2016.2543799
https://doi.org/10.1109/tap.2016.2543799
Publikováno v:
2018 15th European Radar Conference (EuRAD).
This paper presents and compares finite element method (FEM) and method of moments (MoM) monostatic radar cross-section (RCS) simulation results for an example quadcopter, hexacopter and octocopter at X-band, as well as comparing the simulations agai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0515b2cd9a2a7dd35b56b58c76dfe5f1
https://doi.org/10.23919/eurad.2018.8546612
https://doi.org/10.23919/eurad.2018.8546612
Autor:
Christof Schuepbach, Hans Pratisto, Roland Oechslin, Peter Wellig, Urs Boeniger, Matthias Renker, Peter J. Speirs
Publikováno v:
2018 19th International Radar Symposium (IRS).
Nowadays, unconventional Low Slow and Small (LSS) air threats pose serious challenges that cause deep concerns among military and civilian security organizations. Consequently, there is a high demand for robust and reliable counter small unmanned aer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfd063b0e101bfbbb93198c60dbbba69
https://doi.org/10.23919/irs.2018.8448071
https://doi.org/10.23919/irs.2018.8448071
Publikováno v:
Remote Sensing, Vol 9, Iss 11, p 1147 (2017)
Gabella, Marco; Speirs, Peter James; Hamann, Ulrich; Germann, Urs; Berne, Alexis (2017). Measurement of Precipitation in the Alps Using Dual-Polarization C-Band Ground-Based Radars, the GPM Spaceborne Ku-Band Radar, and Rain Gauges. Remote sensing, 9(11), p. 1147. Molecular Diversity Preservation International MDPI 10.3390/rs9111147
Gabella, Marco; Speirs, Peter James; Hamann, Ulrich; Germann, Urs; Berne, Alexis (2017). Measurement of Precipitation in the Alps Using Dual-Polarization C-Band Ground-Based Radars, the GPM Spaceborne Ku-Band Radar, and Rain Gauges. Remote sensing, 9(11), p. 1147. Molecular Diversity Preservation International MDPI 10.3390/rs9111147
The complex problem of quantitative precipitation estimation in the Alpine region is tackled from four different points of view: (1) the modern MeteoSwiss network of automatic telemetered rain gauges (GAUGE); (2) the recently upgraded MeteoSwiss dual
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a910a9f200a4faaa8bad8b3b8e01781f
Autor:
Robert J. C. Middleton, Duncan A. Robertson, Scott L. Cassidy, David R. Bolton, Peter J. Speirs, David G. Macfarlane, Paul N. Marsh, Robert I. Hunter, Graham Smith
Publikováno v:
SPIE Proceedings.
We present a 340 GHz 3D radar imaging test bed with 10 Hz frame rate which enables the investigation of strategies for the detection of concealed threats in high risk public areas. The radar uses a wideband heterodyne scheme and fast-scanning optics
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9479e432d496c1cdde4b4cf3d2551253
https://doi.org/10.1117/12.918581
https://doi.org/10.1117/12.918581
In feedhorn design, the power coupling to the fundamental free-space LG00 mode, or Gaussicity, is a good proxy for high performance, particularly the sidelobe and cross-polar levels and the near-field behavior. Gaussicity can be maximized by ensuring
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6fd1ae5dcbca812c72bcc085bedd0ef2
https://infoscience.epfl.ch/record/225679
https://infoscience.epfl.ch/record/225679