1) frequency fitting
频率拟合
1.
In using this algorithm,the LFM instantaneous frequency and DOA value can be obtained by frequency fitting and Time Frequency Average-MUSIC method.
为解决冲击噪声背景下的LFM信号频率和波达方向(DOA)联合估计问题,本文依据FLOM-时频分布理论和谱图重排方法,提出了一种基于FLOM-时频分布谱图重排的频率特性和DOA联合估计算法,该算法解决了时频分布DOA估计算法不能应用于冲击噪声的不足,能有效抑制交叉项影响,具有较好的时频聚集性能,算法通过频率拟合和时频平均-MUSIC算法可同时得到LFM信号的瞬时频率和DOA值,相比于目前已有的DOA算法,该算法具有更好的参数估计精度。
2) analog frequency
模拟频率
1.
To distinguish the differences among analog frequency,digital frequency and normalization frequency is very important in signal processing and computer simulation.
在信号处理和计算机仿真中,明确模拟频率、数字频率及归一化频率等各种频率之间的关系是十分重要的。
3) Virtual Frequency
虚拟频率
1.
The Design of Virtual Frequency Feature Scanning Device Based on DDS
基于数字式直接频率合成的虚拟频率特性测试仪设计
4) Direct Analog Frequency Synthesis(DAFS)
直接模拟频率合成
5) simulating method of phenological cumulative frequency
物候累积频率拟合法
1.
Methods We developed a simulating method of phenological cumulative frequency to determine the seasonal aspect stages of plant communities.
该文利用物候累积频率拟合法对我国东部温带地区7个站点1982~1996年的植物群落季相阶段进行划分,并分析了植物群落季相的空间差异和年际变化及其与气候因子的关系。
6) phenological cumulative frequency modeling
物候累积频率拟合
1.
Phenological observation data of plant communities from 1982 to 1996 at 5 sites and a method for phenological cumulative frequency modeling were used to determine the beginning dates of local phenological seasons and their corresponding threshold values of normalized difference vegetation index(NDVI) in each year.
利用1982～1996年5个站点的植物群落物候观测数据和物候累积频率拟合法,划分各站逐年的植被物候季节,并确定各季节初日对应的当地归一化差值植被指数(NDVI)阈值。
补充资料：频率计量(见时间频率计量)
频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology
口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条