| 摘要 |
2115449 9304381 PCTABS00020 A vehicle measure system involves 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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