Browsing by Author "Ragaini, Enrico"
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Item Open Access A double demodulation algorithm for narrow spectral features(Instituto Geofísico del Perú, 1995) Ragaini, Enrico; Woodman Pollitt, Ronald FranciscoThis paper proposes a technique for processing signals in which the relevant feature consists of the shape and position of narrow doppler spectral lines. The proposed technique is the digital version of a quadrature demodulator, and its purpose is to demodulate a selected spectral line allowing to study its envelope as a slowly varying process.Item Restricted A multi-DSP signal processing and control system for MST radar(IEEE, Institute of Electrical and Electronics Engineers, 1995) Sarango, Martin F.; Woodman Pollitt, Ronald Francisco; Ragaini, Enrico; Vásquez, Edilberto H.This paper describes a signal processing and control system for atmospheric sounding rardars, with improved characteristics with respect to formerly used architectures. We refer especially to wind profiling as an important and interesting application. The system allows up to 4 receiver signals to be processed at the same time, with 60 range gates and 300 m height resolution. The use of two DSPs working in parallel allows the use of a single PC for real time data processing and system control. Some experimental results and reported.Item Open Access Demodulation of complex baseband radar signals for the analysis of multiple narrow spectral lines(American Geophysical Union, 1997-03) Ragaini, Enrico; Woodman Pollitt, Ronald FranciscoThis paper proposes a technique for processing signals in which the relevant spectral feature consists of one or more narrow lines which have a nonzero Doppler shift with respect to the reference frequency. The proposed technique consists of applying a second demodulation process to the demodulated signal obtained as the receiver output. The purpose of such a demodulation is to remove the frequency shift between the observed spectral line and the center of the observed spectral band. This way, the selected spectral line is brought to baseband, allowing the study of its envelope as a slowly varying process. One efficient way to pedorro the second demodulation step is by a digital version of a quadrature demodulator. This idea is translated into an efficient algorithm, employing real multiplications and accumulators. An advantage of such an algorithm is that in arder to observe two spectral lines in symmetrical positions with respect to the center frequency, common multiplication and accumulators can be used. A possible simplification of the algorithm is discussed in which sinusoids used for demodulation are replaced by square waves, so that multiplication reduces to a synchronous sign reversa!. Possible distorsions due to this simplified algorithm are mentioned. Possible implementations of double demodulation in a digital signal processing system are discussed in the final part of the paper.Item Open Access Diseño y fabricación de un radar VHF perfilador de vientos y su operación en la base Antártica peruana Machu-Picchu(Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 1993) Sarango, Martín; Urbina, Julia; Rodríguez, Rodolfo; Ragaini, Enrico; Vásquez, Edilberto; Woodman Pollitt, Ronald FranciscoEl 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 estos primeros peruanos en la Antártida, el Perú optó la calidad de Miembro Consultivo del Tratado Antártico, con todos sus derechos (Vox y voto) y obligaciones. El Perú debe tratar, en lo posible, de mantener la calidad de Miembro Consultivo, para lo cual cada país debe cumplir con las exigencias establecidas en el tratado. La exigencia más importante es la de presentar, anualmente, por lo menos un proyecto de investigación de alto nivel relacionado con la Antártida.Item Open Access El radar VHF perfilador de vientos de la estación Antártica Machu-Picchu(Pontificia Universidad Católica del Perú, 1994) Sarango, Martín; Urbina, Julio; Woodman Pollitt, Ronald Francisco; Ragaini, Enrico; Vásquez, EdilbertoEl propósito de este artículo es dar a conocer el sistema radar MST instalado en la Estación Científica Antártica Machu-Picchu. La concepción, diseño y desarrollo del instrumento (radar) es producto íntegro de la ingeniería peruana. Se presta especial atención al novedoso sistema de procesamiento de datos implementado, que constituye la primera aplicación con Procesadores Digitales de Señales (DSP por sus siglas en inglés) desarrollada en el Perú. Su diseño es totalmente original e innovador frente a los sistemas que actualmente operan en todo el mundo, alcanzando, e incluso superando las capacidades de procesamiento de muchos de ellos. Así mismo se hace una presentación de datos típicos recogidos con el instrumento, y una breve discusión sobre los primeros resultados obtenidos.Item Open Access PC-DSPs-based signal processing and control system for MST radars(Instituto Geofísico del Perú, 1996) Sarango, Martin F.; Woodman Pollitt, Ronald Francisco; Ragaini, Enrico; Vásquez, EdilbertoThis 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 system allows up to 4 receiver signals to be processed in parallel, with 60 range gates and 150 m maximum height resolution. System evaluation and sorne experimental results are reported.Item Open Access Signal processing and control system for the Antarctic peruvian MST radar(Seventh Workshop on Technical and Scientific Aspects of MST Radar (Evento), 1995) Sarango, Martín F.; Woodman Pollitt, Ronald Francisco; Ragaini, Enrico; Vasquez, EdilbertoThis paper describes a signal processing and control system, designed and built in collaboration between Jicamarca Radar Observatory and University of Piura, Peru, for the peruvian MST radar installed in the "Machu-Picchu" Scientific Station, Antarctica (62 05'5 S, 58 28' W). An identical system has been built for the Jicamarca Unattended Long-term Investigations of the Atmosphere (JULIA) project.