Browsing by Author "Michhue, G."

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    Lessons learned observing Farley Buneman waves at low, middle, and high latitudes
    (Instituto Geofísico del Perú, 2008) Hysell, D. L.; Michhue, G.; Larsen, M. F.; Pfaff, R.; Chau Chong Shing, Jorge Luis
    Diapositivas presentadas en: ISEA 12 - 12th International Symposium on Equatorial Aeronomy, May 18-24, 2008. Crete, Greece.
    Palabras clave:High atmosphereRadarIonosphere
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    Shortest-pulses measurements with the SOUSY VHF radar at Jicamarca
    (Instituto Geofísico del Perú, 2006) Woodman Pollitt, Ronald Francisco; Michhue, G.; Castillo, O.; Roettger, J.
    We describe here the technical preparations for this special experiment, namely the careful measurements of the bandwidth of the antenna array, the transmitter and the receiver system. Test experiments were carried out with a complementary code with 250 nanoseconds band length. The transmitter stages were tuned for optimum amplitude and phase response. The signals at the output directional coupler and the received backscattered signals were oversampled at 125 nanoseconds, corresponding to 18.75 meter range. Due to the wide bandwidth of 6 MHz interference by the Channel-2 TV transmitter in Lima had to be minimized. The most resolution limiting factor is the bandwidth of the transmitter 600-kW final amplifier, which resulted in a minimum transmitted pulse width of 370 nanoseconds. Using the driver at 20 kW, the mínimum pulse width was even shorter. We describe the decoding and deconvolution procedures, which should allow a better resolution than 370 nanoseconds, as well as a local normalization method applied to the data. This shows that layers/sheets thinner than 30-40 meters were observed, which are described in paper 1.1. We claim that this configuration of the SOUSY VHF Radar at Jicamarca is the world-leading MST radar in terms of range resolution.
    Palabras clave:RadarMeasurementsJicamarca Radio Observatory
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    Sousy radar at Jicamarca system description
    (Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 2003) Woodman Pollitt, Ronald Francisco; Castillo, O.; Michhue, G.; Reyes, P.; Villegas, S.
    The main characteristics that differentiate the SOUSY radar from the Jicamarca radar are: (1) its bandwidth (4 MHz against 700 KHz for the Jicamarca radar) and (2) its steerability. The wider bandwidth allows an altitude resolution of at least 75 meters. The Sousy radar is a phased array that allows for a wide and agile steerability of its antenna (+/- 15°). In order to satisfy our scientific need, we have redesigned the antenna to have two main positions, zenithal and 15° south.
    Palabras clave:RadarAntennasSystem design
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    The MPI-SOUSY-VHF Radar at Jicamarca: high altitude-resolution capabilities
    (Instituto Geofísico del Perú, 2007) Woodman Pollitt, Ronald Francisco; Michhue, G.; Röttger, J.; Castillo, O.
    The MPI-SOUSY radar has been moved from its original location at the Harz Mountains, Germany, to the Jicamarca Observatory. Two main modifications have been made to the system: 1) The antenna array now consist of 126 Yagis deployed in an square array of 16x16, 4 element Yagis, similar to the original ones, and 2) the control and data acquisition system has been modernized as described later on. The phase steering system has not been implemented yet, but is planned for the future.
    Palabras clave:RadarIonosphereJicamarca Radio Observatory