spectral frequency

Double frequency spectral density functio

双重频率谱密度函数

Then the paper presents a phase measurement method of frequency shifting based on multiple spectral bands.

并提出了一种多谱段分色频移相位测量方法,给出了测量原理和精度的分析.

It details core algorithm of the instrument including TDR test, frequency response test, digital tracking filter, power spectral density test, load coil detection, DMT test, voltage test, current test, resistance test and capacitance test.

详细阐述TDR测量、频响测量、数字跟踪滤波、功率谱密度测量、加感线圈检测、DMT测量、电压测量、电流测量、电阻测量、电容测量核心算法。

Applying the power spectral analysis, the laws of 2.2-year-periodicity can be found. With the method of the degree and time of concentration, we found that hails and cold disasters have a high frequency in spring and floods, droughts and typhoons often happen in summer.

对地震、水灾等6种灾害的功率谱、集中度和集中期分析显示，南通市自然灾害具有2.2年的年际变化规律和春季多冰雹、寒害，夏季多旱涝、台风的年内分布规律；

Simulation results show that compare to the rise cosine pulse, with the narrow main valve and the faster high frequency rolling and the better resisting of spectral spreading, the new type IJF code has better performance.

仿真结果表明：与传统的升余弦脉冲比较，新设计的IJF码型性能更加优越，表现为主瓣窄，高频滚降快，有效地抑制了频谱扩展。

Limited error temporal decomposition algorithm for line spectral frequency parameters quantization

一种有限误差线谱频率参数暂时分解量化算法

Double frequency spectral density functio three-dimensional dynamic spectrum analyser

双重频率谱密度函数三维动态频谱分析仪

And then, on the basis of spectral analysis to the transmission signal to obtain the relationship between slot depth and the absorption frequency.

对透射波的信号进行了处理，得出裂纹深度和吸收频率的对应关系。

In lidar system basing on the brim detecting technology, it is crucial to determine the absorption spectral profiles of molecule absorption cell filter and the center frequency of emission laser signal in design of lidar system.

基于边缘探测技术的激光雷达系统中，确定分子吸收池滤波器的吸收光谱谱线，以及确定发射激光信号的中心频率，是实现激光雷达系统设计的核心问题。

The simulation results show that for this algorithm there is no bias in the frequency estimation, and the spectral line splitting is very week and the spectral resolution is high.

计算机仿真表明，用这种方法进行谱估计，不会产生谱漂移现象，谱分裂得到明显减弱，而且还具有很高的频率分辨能力。