frequency measurement

This cymometer is designed by the complete synchronous digital frequency measurement method based on the programmable logic devices FPGA.

本频率计采用的是全同步数字测频法并在FPGA可编程逻辑器件上进行设计实现。

Frequency measurement has important meaning not only for project applications but also for high precision timing system, but ± 1 count error limits the improvement of measure precision.

频率测量不仅在工程应用中有非常重要的意义，而且在高精度定时系统中也处于核心地位，±1个计数误差通常是限制频率测量精度进一步提高的重要原因。

Frequency measurement also is important control technology in running military power system.

频率测量也是军用电力系统运行控制中的重要技术.

An algorithm for power system frequency measurement based on numerical differentiation and central Lagrange interpolation is presented.

提出了一种基于数字微分和拉格朗日插值的系统频率快速而准确的测量算法。在未知信号参数的情况下，以一固定的采样频率如512×50Hz对信号进行采样，得到一采样序列。

Frequency measurement of vibrating wire sensors using the method of equally accurate measuring frequency

用等精度测频方法实现振弦式传感器频率测量

A method for aqueduct structure damage detection based on frequency measurement

一种基于频率测量的渡槽结构损伤识别方法

This paper introduces the design of the changeable gate frequency measurement.

介绍了变闸门频率测量仪的设计方法.

Coherence Detection and Frequency Measurement for Recognizing Backscattered Signal of Pulse Doppler Radar

PD雷达识别中的相参性检测和频率测量

Development of a new power system frequency measurement and alarm system

一种新的频率测量与报警系统的研制

The reach paper mainly discusses the design process of multi-function cymometer that uses CPLD to count the frequency measurement and cymometer is also controled by signal chip computer.

本文主要论述了利用CPLD进行测频计数，单片机实施控制实现多功能频率计的设计过程。

The reach paper mainly discusses the design process of multi-function cymometer that uses CPLD to count the frequency measurement and cymometer is also controled by signal chip computer.

本文主要论述了利用CPLD进行测频计数，单片机实施控制实现多功能频率计的设计过程。

Discussion on fault location filter of transmission line based on basic frequency measurement

基于基频电气量的输电线路故障测距的滤波探讨

The portable blade frequency measurement instrument based on DSP is designed next. The DSP-based circuit board is made and the software program for testing hardware circuit board is coded.

论文完成基于DSP芯片的便携式叶片频率测试仪的硬件电路设计和电路板的制作，并完成对电路板的测试。

It also introduces the development of time and frequency measurement and control techniques which are the most representative in the metrology area. It can reflect the relationship among instruments and the newest achievements of science and technology.

同时还就测试计量领域最有代表性的时频测控技术的发展、近年来在国际上的影响反映了仪器与测量技术与现代科学技术的最新成就之间的互为依存的关系。

This frequency meter only needs several resistances and electric capacities and clock crystal oscillating circuit for the microcontroller working outside, then it may realize the frequency measurement function.

该频率计只需外接几个阻容器件和供微控制器工作时钟的晶体振荡电路，就可实现频率测量功能。

Frequency measurement can be blocked by using an undervoltage stage.

可使用欠压阶段中断频率测量。

Optical Beat Frequency Measurement Technic and Its Application

光拍频测试技术及其应用

This paper presents a new algorithm used to demodulate high code rate DQPSK telemetry signal by digital frequency measurement.

本文根据高码速率DQPSK遥测信号的特点，介绍了一种通过数字瞬时测频来完成对高码速率DQPSK信号解调的方法。

Comparison between Analog and Digital Processing Method in Time and Frequency Measurement

模拟和数字处理方式在时频测控领域中的比对研究

Study on Application of Radio Frequency Measurement Technology in Sugar Industry

射频检测技术在制糖工业中的应用研究

The system with double 8051 chips collaboration realizes frequency measurement, improves reaction velocity of measurement system greatly and can be widely used in real time control systems.

该系统采用双8051芯片相互协作实现频率测量，使测量系统的反应速度大大提高，特别适合于在许多实时控制的系统中推广应用。

It is an new approach of time interval and frequency measurement, which can be used to measurement short time interval by detecting the phase coincidence point between the signal and its transfer delay with related length.

这一理论利用信号的时&空关系通过对被测时间信号与其在长度空间上传输延迟的重合检测来测量短时间间隔，依此为基础可完成各种时间间隔与频率测量仪器。

In conclusion, the trend of power system frequency measurement is naturally educed.

最后对电力系统频率测量的发展趋势提出看法.

This cymometer is designed by the complete synchronous digital frequency measurement method based on the programmable logic devices FPGA.

本频率计采用的是全同步数字测频法并在FPGA可编程逻辑器件上进行设计实现。

High Precision Frequency Measurement Method and Its Application in Four Frequency Laser Gyros

高精度测频方法及其在四频激光陀螺中的应用

In modern electronic warfare, instantaneous frequency measurement ( IFM) is a crucial technology.

在现代化的电子战情况下，瞬时频率测量（IFM）是一项十分关键的技术。

A High Accuracy Frequency Measurement with Changeable Gate Time by Single Chip Microcomputer

用单片机实现的高精度变闸门测频法

Frequency measurement method design and implementation of microwave ranger finder

微波测距仪频率测量的方法设计与实现

This method is not effective for ultrahigh frequency measurement, because it is difficult to multiply or divide a ultrahigh frequency.

在利用该方法测量特高频率时是非常困难的，因为对高频进行倍频或分频是十分困难的，从而也就造成了特高频测量的主要困难。

Comparing different frequency measurement methods of vibrating beam component ( VBC) a non-contact instantly excited technique of frequency measurement of VBC using diffused reflection optical triangulation is developed.

分析比较了薄片式挠弹性器件自振频率测量的不同方法，进而提出了应用漫反射激光三角法实现对薄片式挠弹性器件进行非接触瞬态激励测量。