多路风速测量方法

Multi-Channel Method for Measuring Wind Speed

自动站测量风速通常只有1路采集处理电路,为了实现多路风速同时测量,针对多路风速测量的特点,设计了基于中断控制器的硬件电路,利用中断方式进行软件计数的方法实现了8路风速同时测量。分析了系统的单片机运行速度和中断程序代码的相互关系,计算中断例程可容许的最长执行时间。这种方法不仅避免了各路中断计数丢失,而且起到了很好抗干扰作用。在本设计基础上,适当增加硬件和软件优化,可以扩展到同时16路风速测量的能力。给出实际的硬件原理图和部分源代码。该测量方法成功地应用于广东省大气探测技术中心开发的多路风速观测系统,并在全国气象行业推广应用,实验数据结果证明,该测量方法实用可行,应用效果良好。

The wind speed measurement at automatic weather stations usually adopts only the singlechannel acquiring and processing circuit. In order to achieve the multi-channel simultaneous wind speed measurement, the multi-channel measurement of wind speed is studied, and the characteristics of the hardware circuit design based on the interrupt controller with the software for interrupt counting are described. The 8-channel simultaneous wind speed measurement can be realized with the method. The relationship between system MCU （Microprocessor Control Unit） operating speed and interruption codes is analyzed, and the longest executive time allowable for an interrupt routine is calculated. This method not only can be used to avoid the interruption count lose, and but also play a very good role of antiinterference. On the basis of the appropriate additional hardware and software optimization, it can be extended to 16-channel simultaneous wind speed measurement. The hardware schematic chart and some source codes are given. This measurement method is successfully put to use in the Multi-Channel Wind Observing System developed by the Guangdong Atmospheric Detection Technology Center, as well as in other institutions across China, and the trial application shows that it is feasible and practical.