Title:
【発明の名称】車両形状決定システム
Document Type and Number:
Japanese Patent JPH06510119
Kind Code:
A
Abstract:
The system comprises an array of microphones 18 and a spark emitter 24. 46 mounted on a vehicle. Sparking produces sound bursts which travels to the microphones 18. From detection of transmission times, the position of the emitter 24, 46 is found. Sound velocities are determined in various directions to ensure the air is homogeneous, else corrections for sound speed variations are applied or data is rejected. Position data determined from various microphones 18 are compared to ensure repeated measurement accuracy. The apparatus includes simple circuitry with fewer received signal processing channels than microphones 18 and intelligent selection of active microphones in consequence. An emitter can be connected to the upper vehicle body via a bent coupler 78, which can pass around a wing for example. This allows the system, which is ground based, to be used for measurements of the upper vehicle body. The positions of microphones 18 are determined precisely before use of the system, using a calibration jig 124. Errors in microphone positioning are then corrected for in the measurements.
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Inventors:
Coachworth, Simon
Application Number:
JP50418393A
Publication Date:
November 10, 1994
Filing Date:
August 14, 1992
Export Citation:
Assignee:
Hane-Warner Corporation
International Classes:
G01B17/00; G01B17/06; G01S5/30; G01S11/14; (IPC1-7): G01B17/00; G01S5/30; G01S11/14
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)