相干调制是近年来水声通信领域中最为活跃的研究课题之一。
Coherent modulation has been one of the most active research fields in digital acoustic communication recently.
连续相位调制(CPM)的最佳相干解调的译码性能取决于其最小平方欧氏距离。
The error performance of continuous phase modulation (CPM) with optimal coherent detection depends on the minimum squared Euclidean distance (MSED).
本文提出了一种新的差分调制方式，我们称之为相干幅度差分相移键控(CADPSK)。
The thesis presents a new differential modulation, Coherent Amplitude and differential Phase Shift Key (CADPSK).
这种脉冲发生器适用于相干光瞬态研究，晶体调制和晶体开关等实验。
This pulser is adapted to coherent optical transient study, crystal modulator and crystal switch experiments etc.
当两相干光附加一按固定频率变化的相位差时，其干涉条纹的光强将随之交变，即为相位调制干涉。
In addition to alternating phase difference between two aims of interferometer, the intensity of light of the interference fringes will vary in the same frequency, which is called as phase modulation.
通过实验，加深对《光电子学》课程中相干光的产生、传输、调制、变换等原理及基本概念的进一步认识。
Through the experiments, students will master the theoretical knowledge learned in the Optical Electronics course, such as generation, transfer, modulation, transformation of coherent light etc.
研究了一种采用多模半导体激光与耦合光纤、采取声光调制及调节相干长度的外差干涉系统。
This paper describes a measuring system basing on an optical heterodyne interferometer, which utilizes a multi-mode laser diode and coupled optical fibers to adjust the coherent length of the system.
从理论上详细分析了光纤环形腔有内相位调制时的输出光电流功率谱密度函数，该理论对任意相干长度的输入激光光源都是有效的。
The power density spectrum of an inner-phase-modulated optical fiber resonator is analyzed theoretically and experimentally, which is valid for any source coherence time.
最后采用了PROM器件作为空间调制器，在实时相干光系统中进行边缘增强效应处理，获得了轮廓清晰的物体图。
Finally, with PROM device as spatial modulator and edge enhanced processing in a real time coherent optical system, a clear image of object can be produced.
本文分析了直接调制半导体激光的相干性，并予实验证实。
The coherence of a direct modulating diode laser has been analysed and compared with experimental results.
针对跳频通信系统，提出一种非相干的，高频带利用率的调制方案。
This paper introduces a multipurpose digital demodulation method based on SDR, which is one kind of non-coherent demodulation types.
通过对振幅调制半径、调制位置、透射率以及空间位置和相干长度参数的改变，可以获得不同形状的光强分布。
Different shapes of intensity distribution can be gotten by changing the parameters of radius, location, transmittance of amplitude modulations and spatial position, and the coherence length.
提出一种用预调制全息干版制作二维彩虹全息图的相干——非相干记录方法，说明了该方法的基本原理，并进行了实验验证。
A new method is presented for making 2d rainbow holograms by using pre modulated holographic plate. The principle of this method and the related experiment are discussed.
采用DSP软件方法，研制了一套基于MFSK调制和非相干能量检测的水声调制解调系统。
An underwater acoustic modem system is built by employing DSP Software based on M-ary frequency-shift-key (MFSK) modulation and non-coherent detection.
采用DSP软件方法，研制了一套基于MFSK调制和非相干能量检测的水声调制解调系统。
An underwater acoustic modem system is built by employing DSP Software based on M-ary frequency-shift-key (MFSK) modulation and non-coherent detection.
应用推荐