US 7,495,599 B2
Simultaneous dual polarization radar system with pedestal mounted receiver
Henry Andersson, Espoo (Finland); Petri Haapanen, Vantaa (Finland); Pentti Karhunen, Vantaa (Finland); Reino Keränen, Espoo (Finland); Jarkko Korte, Espoo (Finland); Timo Lyly, Helsinki (Finland); Olli-Pekka Marstio, Pornainen (Finland); Pauli Niska-Pudas, Helsinki (Finland); Juha Salmivaara, Kerava (Finland); Elena Saltikoff, Helsinki (Finland); Rainer Sanmark, Helsinki (Finland); and Paavo Toppila, Vantaa (Finland)
Assigned to Vaisala Oyj, Helsinki (Finland)
Appl. No. 11/885,272
PCT Filed May 17, 2006, PCT No. PCT/FI2006/000158
§ 371(c)(1), (2), (4) Date Aug. 29, 2007,
PCT Pub. No. WO2006/125851, PCT Pub. Date Nov. 30, 2006.
Claims priority of application No. 20050544 (FI), filed on May 23, 2005.
Prior Publication US 2008/0165052 A1, Jul. 10, 2008
Int. Cl. G01S 13/95 (2006.01)
U.S. Cl. 342—26R  [342/175; 342/188; 342/26 D] 2 Claims
OG exemplary drawing
 
1. A method for simultaneous transmission of H- and V-channels in a dual polarized weather radar in which method
transmitter (1) output is directed in waveguide through azimuth rotary joint (9) to one or both of duplexers (3) by polarizer (2) that splits the signal into horizontal (H) and vertical (V) components,
from duplexers the H- and V-components of the signal are directed through two separate single elevation rotary joints (8) to orthomode feed (7) and directed to atmosphere by dish reflector (6),
on reception the H- and V-components are separated by the orthomode feed (7) and directed through elevation rotary joints (8) by duplexers (3) to H-channel and V-channel (4) of radar receiver and processed further by signal processor DSP (5),
characterized in that
the duplexers (3), polarizer (2), receivers (4) and DSP (5) are located above the azimuth rotary joint but below elevation rotary joints (8), and
a low power calibration signal on the radar's operating frequency locked to the master oscillator of the radar system is taken from the signal source (10) and split into couplers (11) above the elevation rotary joints (8) and fed into receivers (4).