河流流速测量信号处理电路的优化设计

Optimization Design of Signal Processing Circuit for River Velocity and Discharge Measurement

河流流速测量是水文工作的重要内容,涉及防洪安全与管理、水资源开发与利用、水生态保护等多个方面。利用雷达测速原理,针对河道中流动的水体对微波信号反射微弱且情况复杂的特点,设计了对多普勒频移信号进行程控放大、跟踪滤波的信号处理电路。经过电路优化设计的仪器,使测验历时变短,耗电减少和便于携带,也解决了因无法跟踪滤波而出现的死机现象,适合野外流动测量。

Flow velocity and discharge measurement is critical contents of hydrology monitoring, concerning aspects of flood control safety and management, water resources exploitation and utilization, water ecological protection. By the principle of velocity radar, a signal processing circuit is designed to programmable amplification of Doppler frequency shift signal and tracking filters with consideration of weak reflection of microwave signal caused by moving water body and its complicated conditions. The instrument after circuit optimization can shorten measuring duration, reduce power consumption, and is easy to carry, it also can solve issue of ＂dead stop＂ phenomenon caused by unable tracking of filters. So it is very suitable for field moving measurement.