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1. (WO2016062929) DEVICE FOR THE HIGH-PRECISION MEASUREMENT OF THE SPEED OF A MOVING VEHICLE IN RELATION TO A SURROUNDING FLUID

Pub. No.:    WO/2016/062929    International Application No.:    PCT/FR2015/000194
Publication Date: Fri Apr 29 01:59:59 CEST 2016 International Filing Date: Wed Oct 14 01:59:59 CEST 2015
IPC: G01P 5/24
G01S 15/60
G01S 11/02
Applicants: AER
Inventors: SCHEGERIN, Robert
LE BELLEC, Gwezheng
Title: DEVICE FOR THE HIGH-PRECISION MEASUREMENT OF THE SPEED OF A MOVING VEHICLE IN RELATION TO A SURROUNDING FLUID
Abstract:
The invention relates to a device for the high-precision measurement, in real time, of the indicated airspeed (VA) of a moving vehicle, in particular an aircraft (1), in relation to a mass of fluid surrounding same, in particular in relation to a mass of ambient air (MA) surrounding the aircraft (1), and taking account of operating and/or atmospheric conditions, said mass of ambient air (MA) having a direction of movement in relation to the aircraft, represented by a vector W going from downstream to upstream. The aircraft (1) is capable of reaching a subsonic and/or transonic and/or supersonic speed range, and has at least one fuselage (2), with at least one boundary layer (CL) surrounding the aircraft and having a thickness defined by an angle ALFA, said angle ALFA being defined between the external surface of the aircraft (1) and a surface where the flow is close to upstream infinite relative flow. The aircraft (1) comprises a weakly elastic structure capable of deforming slightly according to the aerodynamic and/or mechanical and/or thermal stresses experienced by the aircraft, said aircraft (1) being capable of generating a noise B during its movement and/or operation in the mass of ambient air (MA). The aircraft (1) has a longitudinal axis (OX), a lateral axis (OY), a vertical axis (OZ), forming an orthonormal reference frame (OXYZ), and comprises at least two acoustic wave generators (GA1 and GA2) secured to the structure of the aircraft (1) at respective positions G1 and G2 in the OXYZ reference frame and at least two acoustic wave receivers (RA1 and RA2) secured to the structure of the aircraft (1) at respective positions R1 and R2 in the OXYZ reference frame, said receivers RA1 and RA2 also being located downstream of the GA1 and GA2 generators.