查询词典 radio-frequency spectrum

It is shown by frequency domain analysis and simulations that the transfigured controller can improve the dynamic behavior of the system if the frequency spectrum of the inverse of the non-transfigured controller has the low-pass and high-obstructive characteristics.

从理论上分析了如果用常规的回路成形算法设计出的控制器的逆的频谱具有低通和高阻特性，常规的回路成形控制器变形后能够改善系统的动态性能，并将之应用于船舶自动舵的设计中，获得了满意的控制结果。

The maxima of low-temperature internal friction peaks plot a symmetrical peak-like curve at logarithmic frequency spectrum and the peak-like curve shifts toward high frequencies with the increase of heating rate, indicating that phase transition relaxation time decreases; the maxima of high-temperature internal friction peaks exhibit a linear relation to the reciprocal frequencies, and as the heating rate increases its slope rises, which implies that the heating rate drives the normal movement of phase interface further in low-frequency measurements.

低温内耗峰峰值与对数频率呈现峰形函数关系，随升温速率的增加，频率峰向高频方向移动，相变弛豫时间减小；高温内耗峰峰值与倒数频率成直线关系，随升温速率的增加，直线斜率变大，表明低频测量时升温速率对相界面法向运动的驱动作用更强。

For using the time and space frequency resources in imaging transmission fully, a new hybrid optical code division multiaddress coding scheme is proposed, which is based on imaging transmission with two-dimensional optical orthogonal pattern code and time frequency spread spectrum.

为了在成像光通信中充分利用时间和空间两种频带资源，以成像光通信为基础，提出一种利用二维光正交Pattern码结合时域扩频实现光码分多址编码的新方案。

Studies show that the system has almost the same frequency spectrum efficiency as the orthogonal frequency division multiplexing system.

研究表明该系统有着和正交频分多址复用系统同样的频谱利用率。

In order to obtain good results, we choose proper frequency range in terms of practical signals' frequency spectrum.

为了得到较好的估计结果，要根据具体信号的频谱来决定频率范围的选择。

The numerical results show that outer scale of turbulence has great effect on G-tilt power spectrum and residual variance of tilted tracking at low frequency but almost has no effect on the high frequency.

数值计算结果表明大气湍流外尺度对G倾斜功率谱以及倾斜跟踪残余误差的低频段影响较大，而对高频段的影响可以忽略不计。

For instance took when frequency synthesizer, emphasizes is the switching time, the frequency spectrum purity, took when modem emphasizes is the ring circuit band width and so on.

比如作为频率合成器时，强调的是转换时间，频谱纯度，作为调制解调器时强调的是环路带宽等。

By using holographic theory,hologram sampling theorem and separation condition of frequency spectrum,the maximum spatial frequency of off-axis Fresnel was analyzed,and recording conditions were studied.

根据全息理论，通过分析全息图光栅结构的极值频率，利用抽样定理以及频谱分离条件，分析了离轴菲涅耳全息的记录条件，得到了不同于以往文献的最小记录距离及参考光源设置表达式，并做了计算机模拟验证。

As a parallel transmission technique with multi-carriers, Orthogonal Frequency Division Multiplexing is very suitable for high data rate transmission because it has the advantages of being robust to frequency selective fading, high spectrum efficiency and simple equalizer.

正交频分复用作为一种多载波并行传输技术，能够有效对抗多径信道的频率选择性衰落，同时具有较高的频谱利用率，接收端的均衡也很简单，非常适合于高速率数据传输。

This paper applies Fourier series to detach the fundamental waves phase, adopts the curve fitting to the frequency of the maximum spectrum amplitude, utilizes the sine wave parameters of law to the phase angle of this frequency, calculates δvalue and tanδvalue.

本文以傅立叶级数分离基波相位的方法为依据，通过曲线拟合求频谱幅值最大值处的频率，利用正弦波参数法求该频率处的相位角，从而计算出δ值和tanδ值。

We got alerted a couple of times while we were down south that HETs were on the way to bring us back up north because things were going to go hot again, but it was just rumors.

南下的途中我们不只一次得到警告说重型装备运输车将拉着我们重新北上，因为局势正在变得重新紧张起来，但这只是谣传。

It's the one where they find the ghost in the salt mine.

这一集是演他们在盐矿找到鬼