查询词典 frequency modulation

This method estimates Doppler frequency by eliminating PN code two-phase modulation effect, then gains code phase estimation by circular correlation.

该方法利用伪码二相调制特性，通过乘法消除伪码影响，得到多普勒估计值，在此基础上运用圆周相关法得到的伪码相位估计值。

This paper proposed a new method of distance measurement named the continuous wave narrow bandwidth frequency modulation method.

本文提出了一种连续窄带调频的超声波测距方法。

In frequency modulation continuous wave radar, the target information is usually extracted by Range-Doppler processing.

调频连续波雷达往往通过对回波信号的距离－多普勒处理来提取目标信息。

Actually ,signals are processed from low frequency domain to high one by modulation firstly and alternating current amplification secondly.It can also improve anti-interference抗干扰 ability of circuit and signal to noise ratio of signals.

实际中往往采用更有效的先调制而后交流放大，将信号从低频区推移到高频区，也可以提高电路的抗干扰能力和信实际中往往采用更有效的先调制而后交流放大，将信号从低频区推移到高频区，号的信噪比。

Descend frequency decimator can change the modulation code into binary code.

降频滤波器将类比电路的三角积分调变器输出的调变码转为二进制码。

The digital part contains space vector pulse width modulation, simple center computer processor, proportional-integral controller and descend frequency decimator.

整体架构大致可分为数位和类比电路二大部份，数位部份可分为：空间向量脉波宽度调变器、简易中央电脑处理器、比例积分控制器、降频滤波器。

In the 4th chapter, mainly introduced DEH, the DCS system, and hasstudied in a this system frequency modulation principle as well as thecontrolled process.

在第4章中，主要介绍了DEH、DCS系统，并研究了该系统中的一次调频的原理以及控制过程。

The output of electron acoustic signal in the ferroelectrics is calculated on the basis of their piezoelectric properties. The results show that the magnitude of electron acoustic signal not only related with beam currents, beam power and modulation frequency, but also with sample properties especially electric parameters such as dielectric constant and spontaneous polarization.

本文首次以典型的铁电BaTiO〓材料为试样，从其具有的压电性出发，推导了这类材料的电声信号理论表达式，结果表明电声信号的大小不仅与实验参数如入射电流、入射电子能量以及调制频率等有关。

The leading products of the company is PDM1、3KW full solid state broadcasting transmitters, DAM10、25、50、100KW digital circulate modulate medium wave broadcasting transmitters, M2W10、50、100KW digital circulate medium wave broadcasting transmitters, 100W、300W、1、3、5KW full solid state frequency modulation dimensional sound broadcasting transmitters.

公司的主导产品为PDM1KW、3KW全固态广播发射机，DAM10、25、50、100KW数字循环调制中波广播发射机，M2W10、50、100KW数字幅相调制中波广播发射机，100W、300W、1、3、5KW全固态调频立体声广播发射机、远程监控系统以及发射机辅助产品等。

With the aid of infrared science used in audio and signal transmission control in language labs, the system adopts diplex modulation plan, with audio frequency responsing wide, and little malformation.

问题的提出语言实验室作为现代化教育的重要工具在各大专院校已普遍使用，它是由教师控制台和若干个学生座位组成的。

I can not negligent, he should do what?

我不能不在意了，他要做什么呢？

It is very dangerous to swim in the river alone.

一个人到河里游泳是很危险的。