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- On the basis of design of DDS utilizing FPGA, it presented a method of realizing the altitude modulation by generating the main wave and the modulation wave respectively, and the frequency modulation by changing frequency tuning word of main DDS. 在利用FPGA实现DDS的基础上,使用两路DDS分别产生主波形和调制波形,方便地实现两个任意波信号的幅度调制; 同时,通过调制波形数据实时控制主DDS的频率控制字,用数字的方法直接实现波形的各种频率调制。
- frequency modulated wave 调频波
- An Analysis of the Detective Performance of the Pulse Frequency Modulation Wave 脉冲调频波探测性能分析
- There is a growing interest in the Frequency Modulated Continuous Wave (FM-CW) SAR for its small cubage, light weight, cost-effective and high resolution. 调频连续波(FM-CW)合成孔径雷达因其体积小、重量轻、低成本及分辨率高等特点越来越受到关注。
- In the FMCW(frequency modulated continuous wave) liquid level measuring system,the key to measure the distance is to detect the frequency of the sinusoidal echo beat signal. 在FMCW(调频连续波)微波液位测量系统中,回波差拍正弦信号的频率检测是实现距离测量的关键。
- There is a growing interest in the frequency modulated continuous wave(FM-CW) SAR for its advantages such as small cubage,light weight,cost-effective and high resolution. 调频连续波(FM-CW)合成孔径雷达因其体积小、重量轻、成本低及分辨率高等特点越来越受到关注。
- The paper presents a new radar system based on Frequency Modulated Interrupting Continuous Wave(FMICW) by exploiting the hopping frequency technique to improve the capability of HFGWR. 为提高高频地波雷达的抗干扰能力,提出了一种在线性调频中断连续波的基础上基于跳频技术的新高频地波雷达体制。
- In order to obtain high range resolution, the Chirp signal is used as subpulse to form stepped frequency modulated radar signal. 摘要为了获得高距离分辨率，将线性调频信号作为子脉冲构成调频步进雷达信号。
- In order to obtain enough bandwidth,HF radars use an irregularly frequency modulated waveform. 为了获得足够的带宽，雷达采用一种非规则频率调制的波形。
- The Linear Frequency Modulated（LFM） signal is a popular pulse compression radar signal. 摘要 线性调频信号是雷达中常采用的一种脉冲压缩信号。
- Stepless frequency modulated speed,low noise,low vibration driving and smooth running. 速度无级调速，低噪音，低振动传动，运行平稳。
- This paper puts forward the signals transmission method combining the MSK technique with the radio technique of frequency modulated ultra-short waves. 文章提出了采用最小频移键控(MSK)技术与调频超短波无线电技术相结合传输信号的方法。
- Frequency modulation does not allow static to creep in. 频率调制不允许静电干扰混入。
- This paper puts forward the signals transmission method combining the MSK technique with the radio technique of frequency modulated ultra short waves. 文章提出了采用最小频移键控 (MSK)技术与调频超短波无线电技术相结合传输信号的方法。
- Frequency modulation is not possible with polychromatic light. 多色光不可能调制频率。
- A microvibration sensor based on the optical feedback effect in a direct frequency modulated laser diode is developed for optical detection of muscle vibration. 摘要为了实现肌肉震颤的光学探测，本文设计并研制了一套基于光反馈效应的直接频率调制激光二极管微振动传感器。
- The analysis and simulation for Linear Frequency Modulated (LFM) pulse compression signal of radar, it is very significant in the field of radar signal simulation. 摘要对雷达线性调频脉冲压缩信号进行分析以及仿真，在雷达信号模拟领域中是非常重要的。
- By replacing the sinusoidal modulation wave with its tangent or secant, three novel tangent sampling methods and two secant sampling methods were gained. 并在此基础上，分别利用切线和割线来近似替代正弦调制波，获得了3种新的切线采样法和2种割线采样法。
- In this paper,direct platemaking technology is briefed,frequency modulated half tone dot technology (principles,characters and technologics) is emphasized. 本文简述了直接制版技术，着重叙述了调频网点技术，包括原理、特点及技术。
- The linearity of the FMCW signal is an important index to appraise the frequency modulated source.It determines the radar range resolution in the system of radar range. 线性调频连续波(FMCW)信号的线性度是衡量线性调频源质量的一个重要指标，在雷达测距系统中，它决定着雷达的距离分辨率。
