基于GNSS掩星资料的风云卫星微波载荷产品质量验证与分析

聚焦新一代国产极轨气象卫星微波载荷和全球导航卫星系统(GNSS)掩星临边观测的探测机理,及其各自仪器的性能指标和在轨运行的特点,利用2019年1月1日到12月31日的全球数据,开展基于GNSS掩星资料的风云气象卫星微波观测亮温对比和反演廓线产品质量检验研究。在匹配数据时间分辨率为30 min和经纬度分辨率为0.5°的情况下,亮温偏差小于5 K,大气温湿度探测精度分别为1.92 K和22.8%,同时分析了2019年青藏高原地区大气温湿度的时空分布规律。结果表明:风云气象卫星微波辐射计具有全球全天候探测大气温湿度的功能,在近地面具有丰富的反演数据,而对于GNSS掩星探测资料,3 km以上探测精度优于微波湿度计,近地面数据较少,两者联合,既可以互相补充和验证,又能以青藏高原为例,分析长时间序列气象和气候数据,为后续的气候研究提供基础数据集。     

一种AOS遥测源包多路调度算法

高级在轨系统（AOS）体制的核心是调度策略,文章针对我国航天器遥测数据及信道特点,提出了一种高效的AOS遥测源包调度算法,该算法基于优先级调度,对各种数据可以设计不同的优先级,在调度时满足了低速数据的传送要求以及突发数据等高实时性的要求,尤其是信道空闲时算法在优先调度高优先级源包的同时,也兼顾了低优先级源包的下传需求。...     

多目标扩频角度跟踪系统及精度分析

扩频角度跟踪系统是实现扩频测控的前提,研究无数据包络情况下的直接扩频角度跟踪系统,在系统建模的基础上进行了数学建模、精度分析和数学仿真。结果表明:扩频角跟踪精度可达到单脉冲信标跟踪的精度;精度不仅受接收机输入端噪声的影响,还受数据自噪声的影响;高信噪比情况下,角误差通道的相移限制跟踪精度,但合理设置参数仍可实现多目标、高精度的扩频角度跟踪。     

测控技术标准体系浅析

在新版《军用标准体系表》中,测控技术标准作为24项共用技术之一被单独列项,为测控技术标准体系建设提供了良好机遇。在扼要介绍新版《测控技术标准体系》的基础上,对新版《测控技术标准体系》的构建思路、技术特点进行了简要分析。     

基于Matlab语言的系统可靠性仿真

Matlab是一种高性能数值计算语言 ,本文用Matlab语言编制系统可靠性仿真程序 ,并给出了具体实例。此方法比其他方法简单有效 ,可适用于复杂系统。     

电子系统维修性、测试性分析与设计方法讨论

以维修性、测试性理论为依据 ,运用系统分析方法 ,综合多学科 ,在工程实践中 ,探索出了电子系统使用期间的维修性、测试性分析与设计模型和方法 ,该模型总结出了六种维修性、测试性分析方法 ,结合系统功能分析 ,按四个时段的不同要求 ,由整体到局部 ,逐级分析到最小软、硬件单元 ,以实现设计的完整性、系统性和深入性 ,为全面分析维修性、测试性薄弱环节 ,有效改善维修性、测试性 ,提供了新的方法和思路     

航天ATS快速测试体系结构研究

快速发射是未来空间信息作战和导弹武器发展面临的新课题,快速测试是快速发射的重要环节。航天ATS快速测试需要遵循一定的体系结构而发展。以国际通用测试系统体系结构为背景,结合我国航天测试的需求,提出了航天ATS快速测试体系结构,分析了航天ATS快速测试的测试流程并行化、关键参数连续监测化和测试数据处理快速化等目标,以及所涉及到的图形化程序开发、仪器可互换等关键技术。结论有利于促进航天ATS快速测试技术的进步,并为其发展提供参考。     

The International DORIS Service (IDS): Toward maturity

DORIS is one of the four space-geodetic techniques participating in the Global Geodetic Observing System (GGOS), particularly to maintain and disseminate the Terrestrial Reference Frame as determined by International Earth rotation and Reference frame Service (IERS). A few years ago, under the umbrella of the International Association of Geodesy, a DORIS International Service (IDS) was created in order to foster international cooperation and to provide new scientific products. This paper addresses the organizational aspects of the IDS and presents some recent DORIS scientific results. It is for the first time that, in preparation of the ITRF2008, seven Analysis Centers (AC’s) contributed to derive long-term time series of DORIS stations positions. These solutions were then combined into a homogeneous time series IDS-2 for which a precision of less than 10 mm was obtained. Orbit comparisons between the various AC’s showed an excellent agreement in the radial component, both for the SPOT satellites (e.g. 0.5–2.1 cm RMS for SPOT-2) and Envisat (0.9–2.1 cm RMS), using different software packages, models, corrections and analysis strategies. There is now a wide international participation within IDS that should lead to future improvements in DORIS analysis strategies and DORIS-derived geodetic products.     

A straw-soil co-composting and evaluation for plant substrate in BLSS

Material closure is important for the establishment of Bioregenerative Life Support System, and many studies have focused on transforming candidate plant residues into plant culture medium. For the limitations of using wheat straw compost as substrate for plant cultivation, a straw-soil co-composting technique was studied. The changes of pH, C/N value, germination index, cellulose, lignin and so on were monitored during the co-composting process. The maturity was evaluated by the C/N value and the germination index. The result showed that after 45 days’ fermentation, the straw-soil final co-compost with inoculation (T1) became mature, while the co-compost without inoculation (T0) was not mature. In the plant culture test, the T1 substrate could satisfy the needs for lettuce’s growth, and the edible biomass yield of lettuce averaged 74.42 g pot⁻¹ at harvest. But the lettuces in T0 substrate showed stress symptoms and have not completed the growth cycle. Moreover, the results of nitrogen (N) transformation experiment showed that about 10.0% and 3.1% N were lost during the T1 co-composting and plant cultivation, respectively, 23.5% N was absorbed by lettuce, and 63.4% N remained in the T1 substrate after cultivation.     

飞机纵向驾驶员诱发振荡灵敏度分析

采用系统灵敏度理论，以修正的带宽准则，增益和相位裕度准则以及Ｎｅａｌ－ｓｍｉｔｈ准则等飞机纵向驾驶员诱发振荡（ＰＩＯ）预测准则作为系统指标，建立了参数变化对诱发振荡预测指标影响的灵敏度公式，以ＪＪ７飞机为例，给出了飞机，操纵系统及驾驶员参数上述指标影响的灵敏度，根据计算结果进行了ＰＩＯ参数敏度预测分析，同时与数值仿真结果进行了对比分析。