1) frequency difference
频差
1.
The Research of Time Delay Estimation Method of General Cross Correlation with Frequency Difference;
频差存在时广义相关时延估计方法研究
2.
In the real three station TDOA locating system,there is frequency difference between IF output of the receiver receiving direct signal and IF ouput of the receiver recieving indirect signal ,which decreases the TDOA estimation precision.
在实际三站或多站时差定位系统中 ,接收转发信号和直达信号的两接收机的中频输出信号存在频差 ,从而影响时差估计精度。
3.
The spatial and temporal characteristics of dual-frequency focused acoustic field of the differential frequency coherence mode were investigated in this paper under the linear acoustic condition,and the effect of partition area of HIFU transducer and various frequency differences on the dual-frequency HIFU acoustic field were also analyzed.
在线性声学条件下,研究了差频相干模式下的双频聚焦声场的空间-时间特性,分析了换能器分割面积、不同频差对声场的影响。
2) FDOA
频差
1.
A Method of Dual-Satellites Geolocation Using TDOA and FDOA and Its Precision Analysis;
双星时差频差联合定位方法及其误差分析
2.
The low orbit dual-satellites passive location method for electronic reconnaissance using TDOA(time difference of arrival) and FDOA(frequency difference of arrival) was studied and presented which locates ground emitter from space satellites.
通过公式推导和替换,该算法将原本复杂的时差、频差定位方程组化简为简单的6次实系数多项式方程,极大地降低了原方程组的计算复杂度。
3.
The locating principle on TDOA&FDOA with twin satellites is discussed in this paper.
分析了双星 TDOA(时差)/FDOA(多普勒频差)定位原理,并提出了增加测向或利用卫星运动特性来消除定位镜像点的方法,最后通过仿真分析了参数测量精度与定位精度的关系。
3) frequency offset
频差
1.
Performance evaluation of NOrth-MDPSK with frequency offset in single path slow fading channel model;
单径慢衰落信道模型中带有频差的NOrth-MDPSK性能评估
2.
In the QPSK demodulation′s system,many factors can cause the carrier′s frequency offset and phase error,such as Doppler frequency offset,the central frequency offset of the receiver′s local oscillator and the phase noise.
针对这一误差,介绍了开环系统中频差校正原理,然后通过滑动窗口求均值的方法实现平均相位误差校正,并利用Matlab仿真证实,在同样信噪比下,采用平均相差法得到的误码率比直接相差提取的方法低很多。
3.
A scheme for joint frequency offset and spread spectrum code time delay acquisition was proposed,and the noise and interference estimation algorithm was put forward based on peak windows.
给出了一种频差与扩频码同步联合捕获的方法,提出了一种基于峰值窗口的噪声与干扰估计算法,基于此估计,在信号识别中采用了相对门限。
4) difference frequency
差频
1.
Spectral analysis of THz pulse waveform reveals that the generation mechanism of THz radiation is nonlinear difference frequency effect.
利用超短激光脉冲泵浦电光晶体LiNbO3产生脉冲THz辐射,并用非线性光学差频原理解释了THz的产生机制。
2.
According to the analysis of the FM ranging theory presented in a large number of references,there are some mistakes in the theory and some serious deficiencies in the analysis of difference frequency signals.
对诸多文献资料关于调频测距信号的理论进行了分析,认为对差频信号的分析方法存在严重缺欠,得出的结论存在若干错误。
3.
The paper introduces theory and experiment enclosing generation of mid-infrared pulse by difference frequency.
中红外超短脉冲激光在科研、军事、民用等方面具有重要意义,而差频技术作为获得中红外激光的一种重要方法,具有重要研究价值。
5) difference frequency generation
差频
1.
Pump bandwidth enlargement of difference frequency generation wavelength conversion based on PPLN;
基于PPLN差频波长转换器泵浦带的拓宽
2.
The recently progress of THz radiation based on nonlinear optical difference frequency generation(DFG) are summarized.
文章介绍了ZnGeP2,GaSe,CdSe,GaAs,GaP,DAST等几种用于太赫兹辐射的中远红外非线性光学晶体的非线性性能,总结了利用它们通过非线性光学差频产生太赫兹方面的最近进展。
6) differential frequency
差频
1.
The method of differential frequency measurement is studied thoroughly.
对差频式测量进行了深入探讨 ,揭示了差频式测量的本质 ,进而将原有的差频式动态传动误差的测量方法移植成一种圆分度静态传动误差测量方法 ,并提出一种用于差频电路工程设计的新方法———齿波对偶法 ,开发了一种用于角位移精密测量的差频式位移传感
2.
The paper presents a new method for measuring magnetizing rate of weak magnetic material-differential frequency method.
本文介绍了一种测量弱磁性物质磁化率的新方法──差频法。
补充资料：差差
1.犹参差。不齐貌。
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