Vaisala Oyj

Sick Ag

Reino Keränen

Chandrasekaran Venkatachalam

Henry Andersson

Pentti Karhunen

Jukka Sirola

Markus Berg

Juha Salmivaara

Petri Haapanen

Jarkko Korte

Olli-Pekka Marstio

Pauli Niska-Pudas

Elena Saltikoff

Rainer Sanmark

Paavo Toppila

Timo Lyly

Tommi Tuovinen

Antti Kivijärvi

Janne Junttila

Petri Hautaniemi

According to an example embodiment, an antenna assembly for a radar apparatus is provided, the antenna assembly comprising: a feed antenna arranged to radiate outbound radio waves that represent a transmitted RF signal supplied thereto and capture a received RF signal that represents inbound radio waves received thereat; and a focusing element arranged to collimate the outbound radio waves into a transmitter beam for transmission towards a monitoring direction and focus inbound radio waves of a receiver beam received at the focusing element from the monitoring direction for reception at the feed antenna, wherein the arrangement of the feed antenna and the focusing element is configured to transmit the transmitter beam as a sequence of substantially concave radio waves and receive the receiver beam as a sequence of substantially convex radio waves.

Antenna for a radar apparatus

Embodiments of the invention are directed to improving the sensitivity in polarimetric radar data. In particular, embodiments of the invention improve the sensitivity of such systems with improved post processing techniques. The sensitivity can be improved by using the co-polar elements (off diagonal elements) of the covariance matrix in power and/or reflectivity determinations. This can not only improve the sensitivity but may also enhance identification and improve quantitative estimates of precipitation.

Off-diagonal element echo power estimator for polarization weather radar

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

This publication discloses an apparatus and method for measuring a gas content. The apparatus includes a light transmitter (), by means of which coherent light can be sent to the measurement object (), a receiver (), by means of which light that has passed through the measurement object () can be detected, and optical means (), by means of which the light intensity of the light transmitter () can be aimed at the receiver (). According to the invention, the optical means include a lens element (), the optical axis of which is arranged essentially obliquely relative to the longitudinal axis of the measurement object (), so that the angles of the normals of the optical boundaries relative to the measuring signal are set obliquely. The lens element () is both a refracting and a reflecting element, and separates the measurement object () from the means ().

Gas content measuring apparatus and method

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Espoo, Finland

Reino Keränen