摘要
运用变闸门测频法对微波测距仪主振频率进行计数测量,采用两个计数器分别对标准频率信号的上升沿和下降沿计数,将2个计数结果进行算术平均作为修正后的计数结果,消除了对被测信号计数产生的±1个字的误差,减少了对标准频率脉冲计数存在的量化误差,测量精度与被测信号的频率无关。结合硬件电路和软件设计,实现了基于PIC单片机的微波测距仪频率检测系统,频率适用范围较宽,测量精度大大提高。实验结果证明该方法有效可靠。
The frequency measurement method of changeable strobe is choosed to measure the frequency of the microwave ranger finder, the two results of arithmetical average are used as modificated results that the two counters take count of the rising and trailing edges respectivly. The ±1 error caused by counting is eliminated with the quantization error by counting the standard frequency pulse reduced and independent of the detected frequency. With hardware and software designing to implement the system of frequency measurement for the microwave ranger finder based on PIC single-chip computer. So it is widely used in frequency detection and the measurement accuracy is improved graetly. The experiment results prove that the method is effective and credible.
出处
《电子测量技术》
2009年第8期71-73,共3页
Electronic Measurement Technology
关键词
微波测距仪
频率测量
单片机
microwave ranger finder
frequency measurement
single-chip computer
