| 摘要 |
<p>The instrument has emission units for emitting signal carrying information representing an altitude at which the instrument is installed. The signal is detected by an altimetric device that utilizes the altitude representing information for calibrating the emission units. The signal is constituted by a radio frequency signal, infrared signal, broadcast signal or ultrasonic signal. An independent claim is also included for a system for calibrating an altimetric device.</p> |
