单视角立体成像技术研究

立体成像是获取目标三维轮廓信息的有效方法。目前,在航天航空领域立体成像方法主要包括：基于立体视觉原理的三线阵成像方法和主动式激光测距立体成像方法。这两种成像方式由于对平台要求较高或者无法得到目标的灰度图像而存在相应的缺陷。文章研究了一种新的单视角立体成像技术。通过对该技术的研究认为,单视角立体成像技术能够实现单台相机单...     

杂光对微光物镜系统中心分辨率的影响与分析

当微光物镜系统中产生杂散光后，将会降低物像的对比度，从而使系统分辨率降低、像质变坏。本文将从理论上加以分析，将杂光系数这一因子，引入于以A·ROSE理论为基础建立的探测方程式之中，并就荣光系数对系统分辨率的影响作了估算，再对有关资料数据进行分析处理，以期使理论与实际结合起来说明问题。     

Simulated observations of the electron coronal density irregularity\overline {n^2 } /(\bar n)^2

A technique to derive the coronal density irregularity factor , wheren is the electron density, has been proposed by Fineschi and Romoli (1993). This technique will exploit the unique UVCS capability of cotemporal and cospatial measurements of both UV line radiation and K-coronal polarized brightness,pB.The ratio of the measured H I Lyman (Ly-) line intensity to the resonant-scattering dominated H I Lyman (Ly-) intensity can be used to extract the collisional component of the Ly-. This component yields an estimate of . The quantity is then obtained from the UVCS white-light K-coronal measurements.We present simulated observations of the UVCS for coronal atmosphere models with different filling factors and electron density profiles, and for different coronal structures (e.g., coronal holes, streamers). These simulations will show how the proposed technique may be used to probe inhomogeneities of the solar corona.     

热钢化对载人航天器舷窗玻璃强度的影响

根据载人航天器热钢化舷窗玻璃中应力分布的特点，导出了钢化玻璃应力强度因子的计算模型，并分析了玻璃热钢化的强化特点。通过该模型，对钢化程度、玻璃厚度以及裂纹尺寸对玻璃强度和裂纹扩展的影响进行了讨论。指出在相同的钢化程度下，热钢化玻璃的断裂应力随玻璃厚度的增加而提高，而非钢化玻璃的断裂应力并不受玻璃厚度的影响。还针对钢化玻璃临界应力强度因子问题进行了讨论，指出由于ＫＩＣ＋Ｋｒ不是材料的物性参数，不能作为钢化玻璃临界应力强度因子。     

一种利用星敏感器的航天器自主定位方法

提出用星敏感器和地平仪测量星光与地平之间的“星光仰角”为观测量，用推广卡尔曼滤波方法来实时估计航天器的最佳位置的自主定位方法。分析比较了同时瞄准恒星的个数、星敏感器的精度以及改变采样周期对航天器定位误差的影响。     

激光雷达变脉宽模拟与探测数据的分析

本文提出了理想激光雷达回波功率Pm与实际回波功率Pr的概念，用数值方法求得不同脉冲宽度，可变背景，可变β层及不同接收门宽情况下的Pr/pm的与高度关系，应用计算结果处理了部分探测数据，显示了北京上空气溶胶导和到50km分子散射的某些形式与特征。     

Cowpeas and pinto beans: Performance and yields of candidate space crops in the laboratory biosphere closed ecological system

An experiment utilizing cowpeas (Vigna unguiculata L.), pinto beans (Phaseolus vulgaris L.) and Apogee ultra-dwarf wheat (Triticum sativa L.) was conducted in the soil-based closed ecological facility, Laboratory Biosphere, from February to May 2005. The lighting regime was 13 h light/11 h dark at a light intensity of 960 μmol m⁻² s⁻¹, 45 mol m⁻² day⁻¹ supplied by high-pressure sodium lamps. The pinto beans and cowpeas were grown at two different planting densities. Pinto bean production was 341.5 g dry seed m⁻² (5.42 g m⁻² day⁻¹) and 579.5 dry seed m⁻² (9.20 g m⁻² day⁻¹) at planted densities of 32.5 plants m⁻² and 37.5 plants m⁻², respectively. Cowpea yielded 187.9 g dry seed m⁻² (2.21 g m⁻² day⁻¹) and 348.8 dry seed m⁻² (4.10 g m⁻² day⁻¹) at planted densities of 20.8 plants m⁻² and 27.7 plants m⁻², respectively. The crop was grown at elevated atmospheric carbon dioxide levels, with levels ranging from 300–3000 ppm daily during the majority of the crop cycle. During early stages (first 10 days) of the crop, CO₂ was allowed to rise to 7860 ppm while soil respiration dominated, and then was brought down by plant photosynthesis. CO₂ was injected 27 times during days 29–71 to replenish CO₂ used by the crop during photosynthesis. Temperature regime was 24–28 °C day/deg 20–24 °C night. Pinto bean matured and was harvested 20 days earlier than is typical for this variety, while the cowpea, which had trouble establishing, took 25 days more for harvest than typical for this variety. Productivity and atmospheric dynamic results of these studies contribute toward the design of an envisioned ground-based test bed prototype Mars base.     

轻型空间相机桁架结构设计与模态分析

为设计适合轻型高分辨空间相机的桁架结构,研究了模态分析的方法和桁架设计中需要考虑的问题.通过对不同的次镜支撑结构进行模态分析和对比,提出了适用于轻型相机的三翼中心三角次镜支撑结构,并完成了整体桁架结构的设计.有限元分析结果表明,所设计的桁架结构具有固有频率高、质量轻等优点,能够满足轻型空间相机的要求,并可以作为其他大口径空间相机桁架结构的设计参考.      

航天器舷窗区域的热控设计和理论分析

结合舷窗的热设计原则,提出舷窗区域的热控设计方案。其中,重点对通过热管技术和高导热材料技术来实现等温化进行了说明,并分析了舷窗法兰框在不同传热方向上的等效导热系数。最后,对航天器舷窗区域在轨飞行的典型传热变化过程建立数学模型,并给出其简化的理论解。     

某轻型飞机总装生产线规划与仿真

随着数字化技术在工厂生产中的应用,生产系统的规划与仿真变得日益重要。本文给出了某轻型飞机总装生产线规划、仿真的详细过程及结果,为生产线的设计提供大量仿真数据,最终为项目的顺利进行提供了有利的保障。