公开(公告)号：EP4497692A1

公开(公告)日：2025-01-29

申请号：EP24191505.7

申请日：2024-07-29

Applicant: ROSEMOUNT AEROSPACE INC.

Inventor： MILLER, Mark S. ,  ACOTT, Phillip

IPC: B64D43/00 ,  G01P5/26 ,  G01P13/02 ,  G01S7/48 ,  G01S17/42 ,  G01S17/58 ,  G01S17/933 ,  G01S17/95

Abstract: Apparatus and associated methods relate to improving measurement of metrics determined by laser air-data systems subject to unwanted background light. Such measurements are improved by estimating and excising the unwanted background light from the total light received by an optical receiver (14) which receives a Doppler-shifted reflected portion of a projected beam of light backscattered by aerosols and air molecules of an atmosphere. The background light is estimated using a background-light rejection filter (16) that separates the light received by the optical receiver (14) into a beam sampling portion and a complementary non-beam portion. The beam sampling portion has band-pass wavelengths that include the Doppler-shifted reflected portion and a portion of the unwanted background light. The complementary non-beam portion includes background light of wavelengths outside of the band-pass wavelengths of the beam sampling portion. The non-beam sampling portion is used to estimate the unwanted background light included in the beam sampling portion.