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Copyright of Study on Optical Communications / Guangtongxin Yanjiu is the property of Study on Optical Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Aero Weaponry is the property of Aero Weaponry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Jilin University (Science Edition) / Jilin Daxue Xuebao (Lixue Ban) is the property of Zhongguo Xue shu qi Kan (Guang Pan Ban) Dian zi Za zhi She and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Advanced Engineering Science / Gongcheng Kexue Yu Jishu is the property of Advanced Engineering Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

For the optimization of anti-jamming agile waveform for helicopter borne fire control radar, an agile phase coding waveform suitable for multi-pulse and short code length is designed based on singular value decomposition (SVD) and cyclic algorithm. First, we construct the constrained quadric optimization problem with low sidelobe ambiguity function in the target region. Second, the quartic is transformed into the quadric according to SVD decomposition, and an iterative convergence algorithm is designed. Third, a quadric iterative convergence algorithm is deduced based on the cyclic algorithm. Finally, the simulation results show that the two algorithms are close to each other in the design of agile waveform optimization performance, but the SVD decomposition algorithm has faster convergence speed, and the cycle calculation algorithm has higher operation speed. [ABSTRACT FROM AUTHOR]

For pulse Doppler radars, the widely used method for identifying second-trip echoes (STs) in the signal processing level yields significant misidentification in regions of high turbulence and severe wind shear. In the data processing level, although the novel algorithm for ST identification does not yield significant misidentification in specific regions, its overall identification performance is not ideal. Therefore, this paper proposes a hybrid method for the identification of STs using phase modulation (signal processing) and polarimetric technology (data processing). Through this approach, most of the STs are removed, whereas most of the first-trip echoes (FTs) remain untouched. Compared with the existing method using a signal quality index filter with an optimized threshold, the hybrid method exhibits superior performance (Heidke skill scores of 0.98 versus 0.88) on independent test datasets, especially in high-turbulence and severe-wind-shear regions, for which misidentification is significantly reduced. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

为了实现相位调制光信号的相位混合运算（2θA-θB、2θB-θA）,描述了简并四波混频光互调效应的工作原理,给出了泵浦消耗情形下四波混频闲频光振幅和相位的解析表达式。重点研究了基于高非线性光纤的相位混合运算器件的实现方案,以四进制相位信号为例分析了输入光幅度噪声对两种相位互调运算结果的影响。仿真计算表明,该运算器件的光噪声指数（光信噪比的劣化）约为6.6dB;当输入光信噪比不低于25dB时,两种运算的符号错误率均低于10-3,对应的误差矢量振幅约为22%。

为了抑制微波光子链路的三阶交调失真,提高链路的动态范围,提出了一种基于相位调制的无色散大动态范围的微波光子链路。通过对相位调制器横电模和横磁模的使用,以及将相位相差π的两路信号相加,消除三阶交调失真;另外,由于线性化后双边带信号转变为单边带信号,消除了色散的影响。仿真实验结果显示,与传统相位调制的微波光子链路相比,该方案的无杂散动态范围扩大了约19.5dB。

光8DPSK（optical Differential 8-Phase Shift Keying）是一种多级相位调制新码型,是光通信领域研究的前沿,文章介绍了光8DPSK调制格式原理和调制解调方式,用Matlab做了仿真,绘制出了频谱图、眼图,并对占空比为0.5的RZ-8DPSK信号做了详细分析,调制和解调了64个伪随机码序列,仿真绘制了光脉冲时序图、相位差图和平衡接收后的电信号时序图。

光纤传感器可以探测诸种外界因素的变化，如速度、电流、温度等。文中介绍将相位调制·干涉型光纤传感器用于测量单模光纤的色散［１］，给出了详细的理论分析，并通过实验进行了有益的探索，最后的结果是令人满意的。