Vaisala Oyj

Juha Salmivaara

Pentti Karhunen

Petri Haapanen

Henry Andersson

Reino Keränen

Jarkko Korte

Pauli Niska-Pudas

Elena Saltikoff

Rainer Sanmark

Paavo Toppila

Timo Lyly

Olli-Pekka Marstio

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

The present invention relates to a method and apparatus for pointing the beams () of a wind profiler comprising a stationary antenna matrix () with several individual antenna elements (). According to the method an input signal is fed to the antenna matrix (), and the phase of the input signal is adjusted for the individual antenna elements () in order to point the beam () of the profiler. In accordance with the invention separate feeder lines for each beam are used for feeding the signals to the antenna elements (), and the phase differences between the individual antenna elements () are controlled with hybrid coupler elements ().

Method and apparatus for pointing the beam of a wind profiler

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Kerava, Finland

Juha Salmivaara