摘要
在SWT声雷达探测系统中,采用作者提出的检测声回波信号的跟踪滤波锁相方法(PLTF),提取Doppler频偏f_d的V-F-BCD变换和模块化设计,减小了锁相环(PLL)的失锁现象,改善了声雷达的测风精度,闭路同源标定结果表明SWT声雷达探测系统的测频精度优于0.1Hz,相当于测风精度可达λ/4/s(λ——发射声波长),由于环境噪声的干扰,将会使测风精度略有降低。
The phase locked tracking filter method (PLTF) of detecting acoustic echo signals, the V-F-BCD transformation of extracting Doppler frequency deviation fd and the modeling design are adopted in SWT-type Acoustic Sodar Probing System . They weaken the phenomenon of loss of lock in PLL and obviously improve the accuracy of measurement of wind velocity . The result of closed loop and same source calibration of oscillation shows that the measurements accuracy of frequency of SWT-type Sodar can be less than 0.1 Hz, and is equivalent to the accuracy of measurement of wind velocity, λ/ 4 s. (λ- transmission acoustic wave-length), but the real accuracy of measurement of velocity is slightly decreased owing to noise interference of ambient field .
出处
《大气科学》
CSCD
北大核心
1991年第2期101-109,共9页
Chinese Journal of Atmospheric Sciences
关键词
大气
边界层
声雷达
探测系统
信号
Sodar
Atmospheric boundary layer
Random channel.
