Development of a phased array Dopplar sodar

本项目的目的是完成一个相控阵多普勒声雷达系统。该系统可以减少常用声雷达天线的数量和体积。相控阵天线由5x5小型扬声器喇叭组成，以电子方式切换，形成五种波束，一种向上，四种倾斜。对接收信号进行数字合成，并采用简化的零差复协方差法进行分析。该仪器于1988年完成，并被带到美国参加在博尔德举行的国际声雷达比较。该仪器具有足够的现场使用能力。

The purpose of this project is to complete a Doppler sodar with a phased array system. By this system we can decrease the number and the volume of antenna of customary used sodar. The phased array antenna consists of 5x5 small speaker horns switched electronically making five kinds of beams, an upward and four inclined. The received signals were synthesized digitally and analyzed by symplified homodyne complex covarience method. The instrument was completed in 1988 and brought to U.S. to attend international comparison of sodars held at Boulder. The instrument has enough capability for field use.