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759 results on '"Hensley S"'

213. Magellan mission summary

Author

Saunders, R. S., primary, Spear, A. J., additional, Allin, P. C., additional, Austin, R. S., additional, Berman, A. L., additional, Chandlee, R. C., additional, Clark, J., additional, Decharon, A. V., additional, De Jong, E. M., additional, Griffith, D. G., additional, Gunn, J. M., additional, Hensley, S., additional, Johnson, W. T. K., additional, Kirby, C. E., additional, Leung, K. S., additional, Lyons, D. T., additional, Michaels, G. A., additional, Miller, J., additional, Morris, R. B., additional, Morrison, A. D., additional, Piereson, R. G., additional, Scott, J. F., additional, Shaffer, S. J., additional, Slonski, J. P., additional, Stofan, E. R., additional, Thompson, T. W., additional, and Wall, S. D., additional

Published
1992
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214. A Temporal Decorrelation Model for Polarimetric Radar Interferometers.

Author

Lavalle, M., Simard, M., and Hensley, S.

Subjects
POLARIMETRIC remote sensing, DECORRELATION (Signal processing), POLARIZATION interferometers, GAUSSIAN processes, SYNTHETIC aperture radar, RADAR in aeronautics
Abstract

This paper describes a physical model of the temporal changes that occur in vegetated land surfaces observed by a repeat-pass radar interferometer. We assume the temporal changes to be caused by a Gaussian-statistic motion of the vegetation elements, with motion variance changing along the vertical direction. We show that the temporal correlation between two interferometric radar signals is affected by the structural parameters of the vegetation, such as canopy height, and varies with the wave polarization. We validate the model using L-band data acquired by the Jet Propulsion Laboratory with the Uninhabited Aerial Vehicle Synthetic Aperture Radar airborne radar. This work provides new insights into the role of temporal decorrelation in interferometric radar applications. [ABSTRACT FROM AUTHOR]

Published
2012
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215. UAVSAR: New NASA Airborne SAR System for Research.

Author

Rosen, P.A., Hensley, S., Wheeler, K., Sadowy, G., Miller, T., Shaffer, S., Muellerschoen, R., Jones, C., Madsen, S., and Zebker, H.

Abstract

NASA's Jet Propulsion Laboratory is currently building a reconfigurable, polarimetric L-band synthetic aperture radar (SAR), specifically designed to acquire airborne repeat track SAR data for differential interferometric measurements. Differential interferometry can provide key deformation measurements, important for studies of earthquakes, volcanoes, and other dynamically changing phenomena. Using precision real-time GPS and a sensor controlled flight management system, the system will be able to fly pre-defined paths with great precision. The expected performance of the flight control system will constrain the flight path to be within a 10 m diameter tube about the desired flight track. The radar will be designed to be operable on a Unpiloted Arial Vehicle (UAV) but will initially be demonstrated on a NASA Gulfstream III. The radar will be fully polarimetric, with a range bandwidth of 80 MHz (2 m range resolution), and will support a 16 km range swath. The antenna will be electronically steered along track to assure that the antenna beam can be directed independently, regardless of the wind direction and speed. Other features supported by the antenna include elevation monopulse and pulse-to-pulse re-steering capabilities that will enable some novel modes of operation. The system will nominally operate at 45,000 feet (13,800 m). The program began as an Instrument Incubator Project (IIP) funded by NASA Earth Science and Technology Office (ESTO). [ABSTRACT FROM PUBLISHER]

Published
2007
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216. Implementation and outcomes of a rapid response team.

Author

McFarlan SJ and Hensley S

Abstract

Adverse events in hospitalized patients are preceded by clinical signs of decline. Thus, early recognition and intervention should improve patient outcomes. At the University of Kentucky Hospital, the impetus to start a rapid response team (RRT) was to decrease unplanned admissions to ICU, adverse events, and mortality overall. On the basis of the outcomes at our hospital, we conclude that there is benefit to having an RRT. The following article outlines processes for RRT implementation and our outcomes to date. [ABSTRACT FROM AUTHOR]

Published
2007
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217. Co-seismic slip from the 1995 July 30 M[subw] =8.1 Antofagasta, Chile, earthquake as constrained by InSAR and GPS observations.

Author

Pritchard, M.E., Simons, M., Rosen, P.A., Hensley, S., and Webb, F.H.

Subjects
SYNTHETIC aperture radar, GLOBAL Positioning System, EARTHQUAKES
Abstract

Analyzes interferometric synthetic aperture radar and global positioning system observations of the displacement field from the July 30, 1995 earthquake in Antofagasta, Chile. Distribution of slip along the co-seismic fault plane; Inverse theory; Factors affecting slip distribution.

Published
2002
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226. EnVision: Undestanding why Earth's closest neighbour is so different.

Author

Widemann, T., Ghail, R. C., Wilson, C. F., Titov, D. V., Kiefer, W. S., Campbell, B., Hensley, S., Le Gall, A., Marcq, E., Helbert, J., Breuer, D., Vandaele, A. C., Bruzzone, L., Ansan, V., Dumoulin, C., Rosenblatt, P., Komatsu, G., and Bovolo, F.

Subjects
EARTH (Planet), SYNTHETIC aperture radar
Published
2021

233. Effects of Crop Damage Caused by the Sugar-cane Borer, Diatraea saccharalis(F.), and the Ratoon Stunting Disease Bacterium on Sugar-cane Yield in Louisiana

Author

Ogunwolu, E., Reagan, T., Damann, K., and Hensley, S.

Abstract

The sugar-cane borer (SCB), Diatraea saccharalis(F.), and the ratoon stunting disease (RSD) bacterium independently caused significant reductions in stalk weight, cane tonnage and sugar yield. A three-fold difference was found in the comparison of per cent loss of cane tonnage due to RSD alone with that due to the disease in combination with SCB damage in first ratoon sugar-cane. Variance analysis failed to detect interaction between damage by SCB and that by RSD. The data analysed were obtained from an experiment of six replication which evaluated the effects of SCB damage and RSD on sugar-cane yield in Louisiana. We used the randomized complete-block experimental design with split-plot arrangement of treatments. Three schedules of insecticide application to the growing cane, against SCB were the main plots whilst the subplots comprised of RSD inoculation vs. no inoculation of sugar-cane plants grown from seed canes with light vs. severe SCB damage. La canne à sucre foreur (SCB), Diatraea saccharalis(F.), et la maladie d’état rabougri de ratoon (RSD) bacteria causent séparement des diminutions en poids de l’approche, le tonnage de la canne, et la production du sucre dans une six réproduction, fait au hasard complete, en utilisant le niveau de dégâts de SCB sur la canne croissante comme les terrains entiers et la combinaision de deux types de graines de canne, plus deux autres niveaux de RSD comme sous-terrains. Une différence était découverte on trois catégories dans la comparaison pour cent perte de tonnage, de canne occasioné par le RSD seulement, par contraste avec cela occasioné a la maladie en commbinaision avec SCB dégâts dans la prémière ratoon canne à sucre. Une analyse donnée par une procédé incompatible ou par des mèthodes de regressions, échouent de découvir la réciproque ou une corrélation entre le dégât par le SCB et celui par le RSD.

Published
1988
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235. A genome-wide association study of diabetic kidney disease in subjects with type 2 diabetes

Author

van Zuydam, Natalie R, Ahlqvist, Emma, Sandholm, Niina, Deshmukh, Harshal, Rayner, N William, Abdalla, Moustafa, Ladenvall, Claes, Ziemek, Daniel, Fauman, Eric, Robertson, Neil R, Mckeigue, Paul M, Valo, Erkka, Forsblom, Carol, Harjutsalo, Valma, Perna, Annalisa, Rurali, Erica, Marcovecchio, M Loredana, Igo, Robert P, Salem, Rany M, Perico, Norberto, Lajer, Maria, Käräjämäki, Annemari, Imamura, Minako, Kubo, Michiaki, Takahashi, Atsushi, Sim, Xueling, Liu, Jianjun, van Dam, Rob M, Jiang, Guozhi, Tam, Claudia H T, Luk, Andrea O Y, Lee, Heung Man, Lim, Cadmon K P, Szeto, Cheuk Chun, Wing Yee, So, Chan, Juliana C N, Ang, Su Fen, Dorajoo, Rajkumar, Wang, Ling, Clara, Tan Si Hua, Mcknight, Amy-Jayne, Duffy, Seamus, Pezzolesi, Marcus G, Marre, Michel, Gyorgy, Beata, Hadjadj, Samy, Hiraki, Koivula, S, Uggeldahl, T, Forslund, T, Halonen, A, Koistinen, A, Koskiaho, P, Laukkanen, M, Saltevo, J, Tiihonen, M, Forsen, M, Granlund, H, Jonsson, Ac, Nyroos, B, Kinnunen, P, Orvola, A, Salonen, T, Vähänen, A, Paldanius, Kr, Riihelä, M, Ryysy, L, Laukkanen, Kh, Nyländen, P, Sademies, A, Anderson, S, Asplund, B, Byskata, U, Liedes, P, Kuusela, M, Virkkala, T, Nikkola, A, Ritola, E, Niska, Tm, Saarinen, H, Oukko-Ruponen, Se, Virtanen, T, Lyytinen, Va, Kari, Ph, Simonen, T, Kaprio, Sa, Kärkkäinen, J, Rantaeskola, B, Kääriäinen, Tp, Haaga, J, Pietiläinen, Al, Klemetti, S, Nyandoto, T, Rontu, E, Satuli-Autere, S, Toivonen, Kr, Lansimaki, Hv, Ahonen, R, Ivaska-Suomela, M, Jauhiainen, A, Laine, Mm, Pellonpää, T, Puranen, R, Airas, Ma, Laakso, J, Rautavaara, K, Erola, Rm, Jatkola, E, Lönnblad, Tr, Malm, A, Mäkelä, J, Rautamo, E, Hentunen, P, Lagerstam, J, Feodoroff, M, Gordin, D, Heikkilä, O, Hietala, K, Fagerudd, J, Korolainen, M, Kyllönen, L, Kytö, J, Lindh, S, Pettersson-Fernholm, K, Rosengård-Bärlund, M, Sandelin, A, Thorn, L, Tuomikangas, J, Vesisenaho, T, Wadén, J, Sipilä, V, Kalliomäki, Ft, Koskelainen, J, Nikkanen, R, Savolainen, N, Sulonen, H, Valtonen, E, Norvio, L, Hämäläinen, A, Toivanen, E, Parta, Ja, Pirttiniemi, I, Aranko, S, Ervasti, S, Kauppinen-Mäkelin, R, Kuusisto, A, Leppälä, T, Nikkilä, K, Pekkonen, L, Jokelainen, Ks, Kananen, K, Karjalainen, M, Kemppainen, P, Mankinen, Am, Reponen, A, Sankari, M, Suominen, P, Lappalainen, A, Liimatainen, M, Santaholma, J, Aimolahti, A, Huovinen, E, Ilkka, V, Lehtimäki, M, Pälikkö-Kontinen, E, Vanhanen, A, Koskinen, E, Siitonen, T, Huttunen, E, Ikäheimo, R, Karhapää, P, Kekäläinen, P, Laakso, M, Lakka, T, Lampainen, E, Moilanen, L, Tanskanen, S, Niskanen, L, Tuovinen, U, Vauhkonen, I, Voutilainen, E, Rcw, Ma, Chan, Jcn, Huang, Y, Lan, Hy, Lok, S, Tomlinson, B, Tsui, Skw, Yu, W, Yip, Kyl, Chan, Tf, Fan, X, So, Wy, Szeto, Cc, Tang, N, Luk, Ao, Tian, X, Jiang, G, Tam, Cht, Lee, Hm, Lim, Ckp, Chan, Kkh, Xie, F, Acw, Ng, Cheung, Gpy, Yeung, Mw, Mai, S, Zhang, S, Yu, P, Weng, M, Maxwell, Ap, Mcknight, Aj, Savage, Da, Walker, J, Thomas, S, Viberti, Gc, Boulton, Ajm, Marshall, S, Demaine, Ag, Millward, Ba, Bain, Sc, Sandholm, N, Forsblom, C, Harjutsalo, V, Mäkinen, Vp, Ahola, Aj, Dahlström, E, Lehto, M, Lithovius, R, Panduru, Nm, Parkkonen, M, Saraheimo, M, Söderlund, J, Soro-Paavonen, A, Syreeni, A, Thorn, Lm, Tolonen, N, Groop, Ph, Mckay, Gj, Salem, Rm, Isakova, T, Palmer, C, Guiducci, C, Taylor, A, Mirel, Db, Williams, Ww, Hirschhorn, Jn, Florez, Jc, Brennan, Ep, Sadlier, Dm, Martin, F, Godson, C, Mayer, L, Gubitosi-Klug, R, Bourne, P, Schutta, M, Lackaye, Me, Gregory, Ns, Kruger, D, Jones, Jk, Bhan, A, Golden, E, Aiello, L, Larkin, M, Nathan, D, Ziegler, G, Caulder, S, Pittman, C, Luttrell, L, Lopes-Virella, M, Johnson, M, Gunyou, K, Bergenstal, R, Vittetoe, B, Sivitz, W, Flaherty, N, Bantle, J, Hitt, S, Goldstein, D, Hainsworth, D, Cimino, L, Orchard, T, Wigley, C, Dagogo-Jack, S, Strowig, S, Raskin, P, Barnie, A, Zinman, B, Fahlstrom, R, Palmer, J, Harth, J, Driscoll, M, Mcdonald, C, Lipps Hagan, J, May, M, Levandoski, L, White, N, Gatcomb, P, Tamborlane, W, Adelman, D, Colson, S, Molitch, M, Lorenzi, G, Mudaliar, S, Johnsonbaugh, S, Miller, R, Canady, J, Schade, D, Bernal, Ml, Malone, J, Morrison, A, Martin, C, Herman, W, Pop-Busui, R, Cowie, C, Leschek, E, Cleary, P, Lachin, J, Braffett, B, Steffes, M, Arends, V, Blodi, B, Danis, R, Lawrence, D, Wabers, H, Soliman, E, Zhang, Zm, Campbell, C, Hensley, S, Keasler, L, Mark, M, Albertini, M, Boustany, C, Ehlgen, A, Gerl, M, Huber, J, Schölch, C, Zimdahl-Gelling, H, Groop, L, Agardh, E, Ahlqvist, E, Ajanki, T, Al Maghrabi, N, Almgren, P, Apelqvist, J, Bengtsson, E, Berglund, L, Björckbacka, H, Blom-Nilsson, U, Borell, M, Burström, A, Cilio, C, Cinthio, M, Dreja, K, Dunér, P, Engelbertsen, D, Fadista, J, Gomez, M, Goncalves, I, Hedblad, B, Hultgårdh, A, Johansson, Me, Kennbäck, C, Kravic, J, Ladenvall, C, Lernmark, Å, Lindholm, E, Ling, C, Luthman, H, Melander, O, Neptin, M, Nilsson, J, Nilsson, P, Nilsson, T, Nordin, G, Orho-Melander, M, Ottoson-Laakso, E, Persson, A, Persson, M, Persson, Må, Postma, J, Pranter, E, Rattik, S, Sterner, G, Tindberg, L, Wigren, M, Zetterqvist, A, Åkerlund, M, Ostling, G, Kanninen, T, Ahonen-Bishopp, A, Eliasson, A, Herrala, T, Tikka-Kleemola, P, Hamsten, A, Betsholtz, C, Björkholm, A, Foroogh, F, Genové, G, Gertow, K, Gigante, B, He, B, Leander, K, Mcleod, O, Nastase-Mannila, M, Patrakka, J, Silveira, A, Strawbridge, R, Tryggvason, K, Vikström, M, Ohrvik, J, Österholm, Am, Thorand, B, Gieger, C, Grallert, H, Ludwig, T, Nitz, B, Schneider, A, Wang-Sattler, R, Zierer, A, Remuzzi, G, Benigni, A, Donadelli, R, Lesti, Md, Noris, M, Perico, N, Perna, A, Piras, R, Ruggenenti, P, Rurali, E, Dunger, D, Chassin, L, Dalton, N, Deanfield, J, Horsford, J, Rice, C, Rudd, J, Walker, N, Whitehead, K, Wong, M, Colhoun, H, Adams, F, Akbar, T, Belch, J, Deshmukh, H, Dove, F, Ellingford, A, Farran, B, Ferguson, M, Henderson, G, Houston, G, Khan, F, Leese, G, Liu, Y, Livingstone, S, Looker, H, Mccann, M, Mcgurnaghan, S, Morris, A, Newton, D, Pearson, E, Reekie, G, Smith, N, Shore, A, Aizawa, K, Ball, C, Bellenger, N, Casanova, F, Frayling, T, Gates, P, Gooding, K, Hattersley, A, Ling, R, Mawson, D, Shandas, R, Strain, D, Thorn, C, Smith, U, Hammarstedt, A, Häring, H, Pedersen, O, Sesti, G, Fagerholm, E, Toppila, I, Valo, E, Salomaa, V, Havulinna, A, Kristiansson, K, Okamo, P, Peltola, T, Perola, M, Pietilä, A, Ripatti, S, Taimi, M, Ylä-Herttuala, S, Babu, M, Dijkstra, M, Gurzeler, E, Huusko, J, Kholová, I, Merentie, M, Poikolainen, M, Mccarthy, M, Groves, C, Juliusdottir, T, Karpe, F, Lagou, V, Rayner, W, Robertson, N, van Zuydam, N, Cobelli, C, Di Camillo, B, Finotello, F, Sambo, F, Toffolo, G, Trifoglio, E, Bellazzi, R, Barbarini, N, Bucalo, M, Larizza, C, Magni, P, Malovini, A, Marini, S, Mulas, F, Quaglini, S, Sacchi, L, Vitali, F, Ferrannini, E, Boldrini, B, Kozakova, M, Mari, A, Morizzo, C, Mota, L, Natali, A, Palombo, C, Venturi, E, Walker, M, Patrono, C, Pagliaccia, F, Rocca, B, Nuutila, P, Haukkala, J, Knuuti, J, Roivainen, A, Saraste, A, Mckeague, P, Colombo, M, Steckel-Hamann, B, Bokvist, K, Shankar, S, Thomas, M, Gan, Lm, Heinonen, S, Jönsson-Rylander, Ac, Momo, R, Schnecke, V, Unwin, R, Walentinsson, A, Whatling, C, Nogoceke, E, Pacheco, Gd, Formentini, I, Schindler, T, Tortoli, P, Bassi, L, Boni, E, Dallai, A, Guidi, F, Lenge, M, Matera, R, Ramalli, A, Ricci, S, Viti, J, Jablonka, B, Crowther, D, Gassenhuber, J, Hess, S, Hubschle, T, Juretschke, Hp, Rutten, H, Sadowski, T, Wohlfart, P, Brosnan, J, Clerin, V, Fauman, E, Hyde, C, Malarstig, A, Pullen, N, Tilley, M, Tuthill, T, Vangjeli, C, Linda T, Ziemek D., Ahluwalia, Tarunveer S, Almgren, Peter, Schulz, Christina-Alexandra, Orho-Melander, Marju, Linneberg, Allan, Christensen, Cramer, Witte, Daniel R, Grarup, Niels, Brandslund, Ivan, Melander, Olle, Paterson, Andrew D, Tregouet, David, Maxwell, Alexander P, Lim, Su Chi, Ronald C W, Ma, Tai, E Shyong, Maeda, Shiro, Lyssenko, Valeriya, Tuomi, Tiinamaija, Krolewski, Andrzej S, Rich, Stephen S, Hirschhorn, Joel N, Florez, Jose C, Dunger, David, Pedersen, Oluf, Hansen, Torben, Rossing, Peter, Remuzzi, Giuseppe, Brosnan, Mary Julia, Palmer, Colin N A, Groop, Per-Henrik, Colhoun, Helen M, Groop, Leif C, Mccarthy, Mark, I, Palombo, Carlo, Clinicum, Diabetes and Obesity Research Program, Research Programs Unit, Nefrologian yksikkö, Department of Medicine, Institute for Molecular Medicine Finland, Tiinamaija Tuomi Research Group, Endokrinologian yksikkö, Per Henrik Groop / Principal Investigator, Leif Groop Research Group, HUS Abdominal Center, HUS Internal Medicine and Rehabilitation, and Lee Kong Chian School of Medicine (LKCMedicine)

Subjects
0301 basic medicine, Male, endocrine system diseases, Endocrinology, Diabetes and Metabolism, LOCI, Genome-wide association study, Type 2 diabetes, Bioinformatics, Kidney Failure, 0302 clinical medicine, Genome-wide analysis, 80 and over, Diabetic Nephropathies, Renal Insufficiency, Chronic, Genome-wide analysis, Type 2 Diabetes, Aged, 80 and over, RISK, INSULIN-RESISTANCE, diabetes, Diabetes, STAGE RENAL-DISEASE, Single Nucleotide, Middle Aged, Type 2 Diabetes, SUSCEPTIBILITY GENES, Adult, Aged, Case-Control Studies, Diabetes Mellitus, Type 2, Female, Genetic Predisposition to Disease, Genome-Wide Association Study, Humans, Kidney Failure, Chronic, Polymorphism, Single Nucleotide, Renal Insufficiency, Chronic, OBESITY, BIOLOGICAL PATHWAYS, nephropathy, Medical genetics, Type 2, kidney, medicine.medical_specialty, Diabetic Nephropathies/epidemiology, Settore BIO/14 - FARMACOLOGIA, Renal Insufficiency, Chronic/complications, NEPHROPATHY, SNP, 030209 endocrinology & metabolism, Nephropathy, 03 medical and health sciences, SDG 3 - Good Health and Well-being, Diabetes mellitus, Journal Article, Diabetes Mellitus, Internal Medicine, medicine, Medicine [Science], Polymorphism, Diabetic Kidney Disease, METAANALYSIS, Genetic heterogeneity, business.industry, Diabetes Mellitus, Type 2/complications, association, Case-control study, nutritional and metabolic diseases, Kidney Failure, Chronic/complications, FAT DISTRIBUTION, medicine.disease, 030104 developmental biology, 3121 General medicine, internal medicine and other clinical medicine, Microalbuminuria, genetic, business
Abstract

Identification of sequence variants robustly associated with predisposition to diabetic kidney disease (DKD) has the potential to provide insights into the pathophysiological mechanisms responsible. We conducted a genome-wide association study (GWAS) of DKD in type 2 diabetes (T2D) using eight complementary dichotomous and quantitative DKD phenotypes: the principal dichotomous analysis involved 5,717 T2D subjects, 3,345 with DKD. Promising association signals were evaluated in up to 26,827 subjects with T2D (12,710 with DKD). A combined T1D+T2D GWAS was performed using complementary data available for subjects with T1D, which, with replication samples, involved up to 40,340 subjects with diabetes (18,582 with DKD). Analysis of specific DKD phenotypes identified a novel signal near GABRR1 (rs9942471, P = 4.5 × 10-8) associated with microalbuminuria in European T2D case subjects. However, no replication of this signal was observed in Asian subjects with T2D or in the equivalent T1D analysis. There was only limited support, in this substantially enlarged analysis, for association at previously reported DKD signals, except for those at UMOD and PRKAG2, both associated with estimated glomerular filtration rate. We conclude that, despite challenges in addressing phenotypic heterogeneity, access to increased sample sizes will continue to provide more robust inference regarding risk variant discovery for DKD. ASTAR (Agency for Sci., Tech. and Research, S’pore) NMRC (Natl Medical Research Council, S’pore)

238. Information on Titan's Surface From Cassini Radar Altimeter Waveforms

Author

Callahan, P. S., Hensley, S., Gim, Y., Johnson, W. T., Lorenz, R. D., Alberti, Giovanni, Orosei, R., Seu, R., Franceschetti, G., Paillou, Philippe, Paganelli, F., Wall, S., West, R. D., Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), Consorzio di Ricerca Sistemi di Telesensori Avanzati, CNR-IASF, Dipartimento INFOCOM [Roma], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Facoltá di Ingegneria, Facoltá di Ingegneria, Naples, Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), and Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
5464 Remote sensing, 5470 Surface materials and properties, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], 5494 Instruments and techniques
Abstract

We have examined range-compressed waveforms from the Cassini Radar operating in altimeter mode (Ku band, bandwidth 4.25 MHz, nadir pointing) during observations of Titan. We find that leading edge detection provides a straight forward determination of a maximum surface height. The heights from the set of observations give a mean radius of Titan about 0.5 km larger than the nominal 2575+/-0.5 km determined from Voyager. The altimeter footprint diameter is about 25 km on the surface and thus represents an average over the terrain. The waveforms are complex beyond the leading edge. We have performed simulations over various sized dunes and other terrain and find reasonable agreement with the signal observed from several regions, consistent with the published report of dunes. We have developed several measures of waveform width and complexity to characterize the surface. We display the consistency among these measures and compare them to other characterizations of the surface.

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