Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Russell Trahan"'
Autor:
Chengxing Zhai, Michael Shao, Navtej S. Saini, Philip Choi, Russell Trahan, Kutay Nazli, Max Zhan, Nez Evans
Publikováno v:
Publications of the Astronomical Society of the Pacific. 134:015005
Near-Earth Object (NEO) initial orbit determination typically uses astrometric measurements during a close approach over a time window much shorter than the orbital period of the NEO. The initial orbit is only weakly determined with dominant uncertai
Autor:
George Helou, Russell Trahan, Matthew J. Graham, Eric C. Bellm, Ashish Mahabal, Thomas Kupfer, Chengxing Zhai, Navtej Saini, Thomas A. Prince, Ben Rusholme, Russ R. Laher, Janice Shen, Frank J. Masci, David L. Shupe, Quanzhi Ye, Philippe Rosnet, Shrinivas R. Kulkarni, Michael Shao
Publikováno v:
Publ.Astron.Soc.Pac.
Publ.Astron.Soc.Pac., 2020, 132 (1012), pp.064502. ⟨10.1088/1538-3873/ab828b⟩
Publ.Astron.Soc.Pac., 2020, 132 (1012), pp.064502. ⟨10.1088/1538-3873/ab828b⟩
The Zwicky Transit Facility (ZTF) is a powerful time domain survey telescope with a large field of view of 47 deg 2 . We apply the synthetic tracking technique to integrate a ZTF’s deep drilling data set, which consists of 133 nominal 30 s exposure
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d5e51b775ffd922a40eb6301cf2f7ef
https://resolver.caltech.edu/CaltechAUTHORS:20190802-105703823
https://resolver.caltech.edu/CaltechAUTHORS:20190802-105703823
Autor:
P. I. Choi, Navtej Saini, William M. Owen, Kutay Nazli, Russell Trahan, Michael Shao, Chengxing Zhai, Nez Evans
Synthetic tracking technique uses multiple short exposure images to observe moving objects to prevent the objects from streaking in an individual frame. It integrates frames in post-processing, where the tracking of telescope at any desired rate can
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfba8c45134c781988cf95a894039cdf
https://doi.org/10.5194/egusphere-egu2020-12729
https://doi.org/10.5194/egusphere-egu2020-12729
Autor:
Bijan Nemati, Stacie Williams, Russell Trahan, Casey J. Pellizzari, Charles A. Bouman, Skip Williams, Michael Shao, Hanying Zhou
Publikováno v:
IEEE Transactions on Computational Imaging. 3:901-916
Synthetic aperture LADAR (SAL) allows high resolution imaging of distant objects. Basic SAL image processing is based on fast Fourier transform (FFT) techniques originally developed for use in radar. These techniques can amplify noise and limit resol
Large or even medium sized asteroids impacting the Earth can cause damage on a global scale. Existing and planned concepts for finding near-Earth objects (NEOs) with diameter of 140 m or larger would take ~15-20 years of observation to find ~90% of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19383593d8b4dd825bc9fc7f7bb7af43
http://arxiv.org/abs/1808.06762
http://arxiv.org/abs/1808.06762
Autor:
Charles A. Bouman, Skip Williams, Russell Trahan, Michael Shao, Stacie Williams, Casey J. Pellizzari, Hanying Zhou, Bijan Nemati
Publikováno v:
Applied optics. 56(16)
The performance of optically coherent imaging systems can be limited by measurement and speckle noise. In this paper, we develop an image formation framework for computing the maximum a posteriori estimate of an object's reflectivity when imaged usin
Publikováno v:
SPIE Proceedings.
An Inverse Synthetic Aperture LADAR (ISAL) system is capable of providing high resolution surface mapping of near Earth objects which is an ability that has gained significant interest for both exploration and hazard assessment. The use of an ISAL sy
Autor:
Bijan Nemati, Inseob Hahn, Mike Shao, Hanying Zhou, Chengxing Zhai, William Schulze, Russell Trahan
Publikováno v:
SPIE Proceedings.
High quality linear laser frequency chirp of high chirp rate is critical to many laser ranging applications. In this paper, we describe a cost-effective chirp linearization approach implemented on our Inverse synthetic Aperture LADAR (ISAL) imaging t
Autor:
Russell Trahan, David C. Hyland
Publikováno v:
Applied optics. 53(16)
Here we expand on the current methods of characterizing small astronomical bodies, particularly asteroids, by viewing stellar occultation events. Stellar occultation has proven to be a viable method for determining the size of moons and asteroids; ho
Autor:
David C. Hyland, Russell Trahan
Publikováno v:
Applied optics. 52(36)
Here, the possibility of a noniterative solution to the phase retrieval problem is explored. A new look is taken at the phase retrieval problem that reveals that knowledge of a diffraction pattern's frequency components is enough to recover the image