空间稳定惯性导航系统参数的姿态误差标校法

为提高空间稳定惯性导航系统的姿态精度,利用姿态误差进行系统级参数标定和校准.首先,给出了姿态误差模型,考虑陀螺漂移、加速度计误差、壳体翻滚失准角、安装误差和框架角零偏的影响;接着,利用姿态误差模型进行可辨识性讨论和分析,总结出能分离的参数和标定方法,并据此设计试验方案.获得姿态误差后,结合最小二乘法和姿态误差模型进行系统级参数标定和校准,结果表明,参数标定误差小于15％的姿态精度指标,校准后,纵横摇角和航向角精度提高了60％和40％.     

High temperature thermoelectric properties of highly c-axis oriented Bi2Sr2Co2Oy thin films fabricated by pulsed laser deposition

High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co20v thin films prepared by pulsed laser deposition on LaA1Oa （001）. Both the electric resistivity p and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m. cm and 202 V/K at 980 K, resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples. A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature. The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application has high temperature thin film thermoelectric devices,     

High temperature thermoelectric properties of highly c-axis oriented Bi₂Sr₂Co₂O_y thin films fabricated by pulsed laser deposition

High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co2Oy thin films prepared by pulsed laser deposition on LaAlO3(001).Both the electric resistivity ρ and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m·Ω· cm and 202 μV/K at 980 K,resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples.A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature.The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application in high temperature thin film thermoelectric devices.     

低信噪比缓动点目标的序贯检测算法的分析和改进

本文主要讨论的是低信噪比红外图像序列中缓动点目标的实时检测问题.在对传统序贯假设检测(正推法)进行了分析后,针对正推法的轨迹交叉和初始点多而引起的组合爆炸等问题,本文给出了一种基于逆推法的统计检测算法,并对如何利用目标的缓动特性和分段技术来提高信噪比,如何表示轨迹等进行了论述.实验结果表明,该算法有较好的性能.     

电激励连续波HF/DF激光器放电参数的优化

放电管作为电激励连续波HF/DF激光器的F原子发生器,在整个激光器系统中占有重要地位。目前流行采用的是高压直流电源加镇流电阻的放电模式,典型电参数为接近10kV高电压、百毫安量级的低电流。传统理论和实验结果均认为:放电管F原子产率与放电管注入功率成正比,从而激光器输出功率也应与之成正比。引入不同阻值的镇流电阻,发现对于相同的注入功率,低电压、大电流模式比高电压、小电流模式更容易获得高的功率输出。     

基于火花隙开关实现的固体热容激光器实验

 在对储能网络的快速恒流充电和氙灯的预燃状态下,通过控制火花隙触发开关上的电压和重复频率,实现“热容”模式下运行的氙灯泵浦钕玻璃激光器的激光输出。初步实验指标达到：重复频率4 Hz,40 J/脉冲,出光25 s,输出能量4 kJ,工作间隙10 min,每次工作出光可将1.5 cm厚的铝板打穿。该激光器的功率输出可定标放大到kW量级以上,适合进行一些固体热容激光器特点的相关实验。     

基于火花隙开关实现的固体热容激光器实验

在对储能网络的快速恒流充电和氙灯的预燃状态下,通过控制火花隙触发开关上的电压和重复频率,实现“热容”模式下运行的氙灯泵浦钕玻璃激光器的激光输出。初步实验指标达到：重复频率4 Hz,40 J/脉冲,出光25 s,输出能量4 kJ,工作间隙10 min,每次工作出光可将1.5 cm厚的铝板打穿。该激光器的功率输出可定标放大到kW量级以上,适合进行一些固体热容激光器特点的相关实验。     

土壤中铅的测量不确定度的评定

对依次用盐酸、硝酸、氢氟酸和高氯酸消解土壤样品后直接用火焰原子吸收分光光度法测定土壤中铅含量的过程,从标准溶液、样品称量、消解、定容、校正曲线和分析仪器等方面分析误差来源,计算求得合成相对标准不确定度为4．6％,扩展不确定度为9．2％。