| 摘要 |
Disclosed is a monostatic sodar system (10) for generating information about atmospheric parameters over an altitude range. The system includes at least three peripheral transmitter-receiver pairs arranged substantially equidistant on a circle (11), with the transmitter (T) and receiver (R) of each of the pairs tilted radially outward with respect to the circle at an angle to the vertical. Each transmitter and receiver comprises an acoustic transducer (12), an acoustic reflector (14) and a surrounding baffle (16), such that acoustic echoes returned from the atmosphere resulting from acoustic transmissions of one transmitter are preferentially received by the receiver of the respective pair relative to all other receivers. The system further includes signal processing means connected to each pair and adapted to: cause at least one transmitter of a transmitter-receiver pair to transmit an encoded acoustic signal into the atmosphere; and process signals received by the receiver of the respective pair during the transmission of the acoustic signal and for a time interval thereafter so as to derive information indicative of the atmospheric parameters with respect to altitude. The signal processing means includes a matched filter to process the received signal by reference to the encoding of the acoustic signal.
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