Vaisala Oyj

Jarkko Korte

Henry Andersson

Pentti Karhunen

Reino Keränen

Juha Salmivaara

Juhana Jaatinen

Petri Haapanen

Elena Saltikoff

Rainer Sanmark

Timo Lyly

Paavo Toppila

Olli-Pekka Marstio

Pauli Niska-Pudas

The present invention relates to a method and apparatus for simultaneous transmission of horizontal (H) and vertical (V) channels in a dual polarized weather radar. The goal of the invention is accomplished by placing the receiver, duplexer and polarizer equipment above the azimuth rotary joint but below elevation rotary joints. The elevation rotary joints and other associated signal paths are calibrated by using a low power signal on the radar's operating frequency that is fed into couplers above the elevation rotary joints.

Simultaneous dual polarization radar system with pedestal mounted receiver

An antenna system and method for measuring azimuth and elevation angles of an active, signal sending radiosonde. The system includes a first passive antenna group having at least two antenna arrays, the direction pattern of which is wide at least in elevation plane for measuring azimuth angle based on the phase differences between the antenna arrays, a second passive antenna group having at least two antenna arrays, the direction pattern of which is wide at least in elevation plane for measuring the elevation angle based on the phase differences between the antenna arrays and the rotational position of the antenna field, and at least one third antenna having high gain for receiving the telemetry signal, the direction pattern of which element is narrow in azimuth plane and wide in elevation plane. The first and second antenna groups form a solid antenna field which is fixedly tilted in a predetermined elevation position.

Antenna system and method for measuring the azimuth and elevation angles of an active, signal sending radiosonde

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Espoo, Finland

Jarkko Korte