Pósters

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https://repositorio.igp.gob.pe/handle/20.500.12816/4798

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Browsing Pósters by Subject "Antennas"

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    ItemOpen Access
    Ship-borne VHF radar for upper atmospheric research
    (Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 1996) Woodman Pollitt, Ronald Francisco; Sarango, M.F.; Soldi, H.
    We have installed a VHF radar on board the Peruvian Vessel BIC Humboldt. Most of radar componentes are similar to those used by the JULIA system at Jicamarca (receptor, transmitor, acquisition (control system). However as expected the antenna design and installation is quite different.
    Palabras clave:High atmosphereGeomagnetismElectrical field
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    ItemOpen Access
    Wide-beam forming using binary phase coding
    (Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 2000) Woodman Pollitt, Ronald Francisco; Chau Chong Shing, Jorge Luis
    In imaging work, it is desirable to have the transmitting beam width matched to the receiving one. One possibility to do this at Jicamarca, when single receiving modules are employed, is using one antenna module as the transmitting array (the whole Jicamarca array consists of 8 by 8 modules). However, with this solution one cannot transmit the high peak power available at Jicamarca (～2 MW). A second solution, where high transmission power is possible, consist on transmitting with ali the antenna modules, but using 4 different sets ofbinary cedes (0 or 180 phase delays), i.e., a two-dimensional complementary phase code. After the decoding process, the information obtained is equivalent to what one would obtain if the high power were transmitted on a single antenna module. The wide beam information is synthesized by adding the second-order statistics obtained with each set of codes. We have tested this idea at Jicamarca to get three-dimensional images of the tropopause and lower stratosphere. For transmission we have used four sets of codes, where each code consists of 4 by 4 elements.
    Palabras clave:Image processingAntennasStratosphere