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    • Woodman Pollitt, Ronald Francisco (56)
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    • Chau Chong Shing, Jorge Luis (6)
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Mostrando 10 de un total de 71 resultados de la colección: Artículos Científicos. (0.039 segundos)

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      Por | Sarango, Martin F.; Woodman Pollitt, Ronald Francisco; Ragaini, Enrico; Vásquez, Edilberto (Instituto Geofísico del Perú, 1996)
      PC-DSPs-based signal processing and control system for MST radars 
      This paper describes a signal processing and control system, designed and built for the Peruvian MST radar installed in the "Machu-Picchu" Scientific Station, Antarctica (62 º05'5 S, 58º28' W). System architecture, based in a single PC and two DSP boards, and design considerations are discussed. Toe ...
        Palabras claves:
      • Signal processing
      • Control systems
      • Radar
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      Por | Woodman Pollitt, Ronald Francisco; Sarango, Martín (1995)
      Doing passive radio astronomy with a MST/ST System: a fast crosscorrelation algorithm 
      There are not too many antennas in the VHF range in the world dedicated to radio astronomy. ST, and specially MST, radars require and have large antenna apertures which could also be used for radio astronomical observations. Definitely, the Jicamarca antenna, the largest in the world (300 m x 300 m), ...
        Palabras claves:
      • Shortwave radio
      • Signal processing
      • Astronomy radio
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      Por | Chau Chong Shing, Jorge Luis; Balsley, Ben B. (American Geophysical Union, 1998-11)
      A statistical comparison of horizontal winds obtained by a variety of spaced antenna techniques using the Jicamarca VHF radar 
      We have used the Jicamarca radar system to measure horizontal winds by a variety of time domain and frequency domain spaced antenna techniques. Horizontal wind comparisons for two orthogonal components are carried out in a statistical sense, i.e., using correlation coefficients, mean differences, ...
        Palabras claves:
      • Ionosphere
      • Radar
      • Thermospheric winds
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      Por | Hitchman, M.; Fritts, D.; Coy, L.; Kudeki, E.; Bywaters, K.; Sudan, R. (American Meteorological Society, 1992-02-20)
      Mean winds and momentum fluxes over Jicamarca, Peru, during june and august 1987 
      Data from the mesosphere-stratosphere-troposphere (MST) radar at Jicamarca, Peru, together with other available data, are used to diagnose the mean structure of winds and gravity-wave momentum fluxes from the surface to 90 km during two ten-day campaigns in June and August of 1987. In the stratosphere ...
        Palabras claves:
      • Mesosphere
      • Momentum flux
      • Quasi- biennial oscillation
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      Por | Sarango, Martín; Urbina, Julia; Rodríguez, Rodolfo; Ragaini, Enrico; Vásquez, Edilberto; Woodman Pollitt, Ronald Francisco (1993)
      Diseño y fabricación de un radar VHF perfilador de vientos y su operación en la base Antártica peruana Machu-Picchu 
      El Perú ingresó al Tratado Antártico en el año 1981. Hasta finales de 1992 se habían realizado tres expediciones peruanas a la Antártida: 1989, 1990 y 1991. Las tres expediciones se realizaron a bordo del B.I.C. “Humboldt”. Gracias a los resultados de las investigaciones científicas, realizadas por ...
        Palabras claves:
      • Radar
      • Vientos
      • Expediciones científicas
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      Por | Yamamoto, Mamoru; Fukao, Shoichiro; Woodman Pollitt, Ronald Francisco; Ogawa, Tadahiko; Tsuda, Toshitaka; Kato, Susumu (American Geophysical Union, 1991-09)
      Mid‐latitude E region field‐aligned irregularities observed with the MU radar 
      Fine structures E region field-aligned irregularities were observed on June 24–25, 1989, with the MU radar at Shigaraki, Japan (34.9N, 136.1E; geomagnetic latitude 25.0N). The 3.2-m scale irregularities were observed with the MU radar in five main beam directions, each of which was nearly perpendicular ...
        Palabras claves:
      • E Region
      • Magnetic fields
      • Radar
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      Por | Woodman Pollitt, Ronald Francisco (American Geophysical Union, 1997-11)
      Coherent radar imaging: signal processing and statistical properties 
      The recently developed technique for imaging radar scattering irregularities has opened a great scientific potential for ionospheric and atmospheric coherent radars. These images are obtained by processing the diffraction pattern of the backscattered electromagnetic field at a finite number of sampling ...
        Palabras claves:
      • Butler matrix
      • Coherent scattering
      • Discrete Fourier transforms
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      Por | Ierkic, H.M.; Gierasch, P.J.; Woodman Pollitt, Ronald Francisco (Instituto Geofísico del Perú, 1990)
      Fixed heigth S-band radar observations of the stratosphere 
      It is now known that turbulence and mixing in the lower stratosphere occurs in intermittent layers of thickness between about 30 and 300 meters. Layered structures also exist in the ocean (Woods, 1969) and in the atmospheres of the other planets (Gierasch and Conrath, 1987). It appears that dissipative ...
        Palabras claves:
      • Radar
      • Stratosphere
      • Turbulence
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      Por | Chau Chong Shing, Jorge Luis; Woodman Pollitt, Ronald Francisco (Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 1999)
      Observations of E-region field-aligned irregularities off the magnetic equator, using the Piura VHF radar 
      We have used the Piura VHF radar (5°12'S, 80" 38'W, ~7.5" N geomagnetic latitude, just outside the magnetic equator) in northem Peru to gather echoes from 3-m E-region field-aligned irregularities (FAI). Similar irregularities have been intensively studied in the equatorial and auroral zones using ...
        Palabras claves:
      • E region
      • Radar
      • Atmosphere
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      Por | Fukao, S.; Maekawa, Y.; Yamamoto, M.; Tsuda, T.; Yamanaka, M.D.; Nakamura, T.; Kato, S.; Woodman Pollitt, Ronald Francisco (1991-08)
      High-altitude-resolution observation of the upper stratosphere and lower mesosphere using Jicamarca VHF radar 
      The high-power VHF radar technique is a powerful tool to lnvestigate winds and turbulence in the middle atmosphere. However, an entire wind or power profile from the upper troposphere to the lower thermosphere. (10-100 km) has not yet been obtained.- Especially, it is very difficult to observe the ...
        Palabras claves:
      • Stratosphere
      • Mesosphere
      • Radar
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