由于大气衰减的影响，非视线散射大气光通信需要使用光学天线以提高对光信号的采集能力，进而增加通信距离。
The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .
本文旨在研究大气随机信道对光通信链路的影响。
The purpose of this thesis is to research on effect of atmospheric random channel to optical communication.
实际星地光通信系统的发射光束为高斯型的情况下，跟瞄误差和大气闪烁是星地激光链路中的主要信道噪声源。
The transmitter beam is Gaussian for real satellite-ground laser communication system. The pointing jitter and atmospheric scintillation are the main noise sources for satellite-ground laser link.
研究大气粒子的光散射特性及大气对散射光偏振态的影响，是为了解决大气激光通信中的相关问题。
To study light scattering characteristics and polarization state changes in the atmosphere, is to resolve the relative problems of the atmospheric optical communication.
目前对无线光通信系统在大气信道中应用LDPC码的研究少见于文献。
For the time being, there is little research of applying LDPC codes to the atmospheric wireless optical communication.
大气湍流对激光通信系统的影响。
Effect of atmospheric turbulence on laser communication system.
在移动大气激光通信中，通常采用信号光和信标光来完成信号的捕获、跟踪、定位以及通信。
In mobile atmosphere laser communication, we often complete acquisition, tracking, pointing and communication by signal laser and beacon laser.
脉冲位置调制(PPM)是大气激光通信的关键技术之一，可以减少激光器的发射功率，增加通信距离。
Pulse Position Modulation (PPM) is one of key technologies for laser communication in Atmosphere, which can reduces the output power of the laser and increases communication distance.
大气湍流对激光通信系统的影响。
Effect of the atmospheric turbulence on laser communication system.
另外，本文还对大气折射对空地卫星光通信的影响做了研究，提出了利用修正光源的发射角来消除大气折射所引起的光束与卫星之间偏移的思想。
In addition, we research atmospheric refraction influence to space-earth satellite communication, and put forward that amending emission Angle can eliminate excursion between beam and satellite.
大气激光通信系统的误码率不仅受到振动时振幅大小的影响，而且受到光学发射天线孔径的影响。
The bit error rate of an atmospheric laser communication system is affected by not only vibration amplitude but also the aperture of optical transmitting antenna.
分析了雾产生的原因、相关数学模型及其对大气激光通信系统的影响。
The causes of fog, the relevant mathematical models and its influence on atmospheric laser communication system are analyzed.
针对大气信道对大气激光通信的质量有很大影响，设计了一种光电复合的光ppm偏振调制硬件系统。
Since atmosphere signal path has a great influence on the laser atmosphere communication quality, a Photo-electrical PPM Polarization Modulation system is designed.
针对自由空间光通信系统，分析了大气色散、大气湍流以及光学系统对光脉冲信号展宽的影响。
The factors which result in pulse stretch in free-space optical communication are analyzed, including atmospheric dispersion, atmospheric turbulence influence and optical system influence.
论文设计了移动大气激光通信系统中的光信号调制解调的实现方案。
Optical modulation and demodulation implementation scheme in mobile atmospheric laser communication system are designed.
大气湍流引起的光强闪烁会严重影响大气激光通信系统的性能，使误码率增加。
But because of the influence of atmosphere, the scintillation caused by the atmosphere turbulence influences performance characteristics (bit error ratio) of the communication of system seriously.
该接口电路在机动式大气激光通信整机的应用中获得了满意的效果，这种方案可为串行通信系统的设计提供一定的参考。
This interface circuit worked very well in the laser-air communication system. This method could also be used as a reference of designing for serial communication system.
展望了大气激光通信广阔的应用前景。
星地激光通信中，大气对激光束的影响是需要考虑的重要问题。
In satellite-to-ground laser communication, the effect of atmosphere to laser beam is an important problem.
本文对大气激光通信光学系统进行设计与分析。
The optical system of atmosphere laser communication is designed and analyzed in this thesis.
大气衰减和大气湍流严重影响着大气激光通信的链路质量。
The rain, snow, and fog in the atmosphere significantly affect the quality and reliability of atmospheric laser communication.
自适应光学技术是缓解大气激光通信中大气湍流影响的有效途径之一。
Adaptive optics technology is an effective way to alleviate the effect of turbulence on atmospheric optical communication.
大气激光通信是近年来人们关注的热点问题之一。
Atmospheric laser communication becomes one of the hot spots in recent years.
大气激光通信是指利用激光作为载波在空间直接进行语音、数据和图像信息传送的一种技术。
Atmosphere laser communication is the technique which usually using laser as the carrier directly transmits voice, data and image in the space.
并以一种能实现语音通信的大气激光通信系统为例，结合实验研究对发射端机和接收端机两大部分进行了阐述。
A new type of atmospheric laser communication system which could transmit sound signals was used as an example. We focus on the experimental research on the details of emitting and receiving devices.
[12]周学文，大气激光通信系统中的时域均衡研究[D]。西安理工大学， 2006。
ZHOU X W. Research of adaptive equalization in atmosphere communication system[D]. Xi'an University of Technology, 2006.
[12]周学文，大气激光通信系统中的时域均衡研究[D]。西安理工大学， 2006。
ZHOU X W. Research of adaptive equalization in atmosphere communication system[D]. Xi'an University of Technology, 2006.
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