| 摘要 |
PCT No. PCT/NO96/00128 Sec. 371 Date Oct. 16, 1997 Sec. 102(e) Date Oct. 16, 1997 PCT Filed May 23, 1996 PCT Pub. No. WO96/37790 PCT Pub. Date Nov. 28, 1996A system for the detection and measurement of atmospheric air movement irregularities such as wind velocity vector, wind shear, downdraft, clear air turbulence, aircraft induced vorteces and turbulence, in particular along a glidepath near airports, whereby an air volume under investigation is illuminated by a radio wave transmitter with a beam of coherent electromagnetic energy and a resulting wave field is received and processed in processor means to derive information on the existence of said atmospheric irregularities and furthermore to give specific measurements of related parameters, comprising at least one receiver for said resulting wave field, which is due to scattering in said air volume, positioned at a bistatic location having a selected distance from said transmitter, characterized by acoustic transmitter means located between said transmitter and said at least one receiver, and adapted to emit acoustic waves into said air volume, with frequency and beamwidth of the acoustic waves chosen such that a resulting disturbance of the dielectric constant of air in said air volume, contributes to said scattering.
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