顾及大气延迟效应的YG-13A斜距标定

针对大气延迟时变误差影响遥感卫星十三号(YG-13A)斜距标定精度的问题,提出利用顾及大气延迟时变误差的斜距标定方法提高其斜距标定精度的策略。首先,利用基于NCEP气象资料和全球TEC数据的大气延迟改正方法来计算各标定景的大气延迟改正量。其次,将各标定景的大气延迟改正量代入斜距标定模型中。最后,在地面布设高精度角反射器控制点的情况下通过顾及大气延迟时变误差的斜距标定模型求解斜距测量系统误差,从而提高和验证斜距测量精度,角反射器控制点的平面和高程精度均优于0.1 m。利用嵩山遥感定标场地区的4组不同拍摄模式下获得的YG-13A卫星影像数据对比试验表明,相较于传统的斜距定标方法,在顾及大气延迟时变误差的情况下,4组数据的斜距改正值离散度均有所下降。利用太原、天津两个区域3景影像验证斜距改正后的精度,最小值为0.55 m,最大值为0.91 m,均值为0.70 m。试验结果证明了顾及大气延迟时变误差的斜距标定方法的有效性和可行性。     

CSD1800A型钻机在青藏高原应用效果及对比分析

介绍了CSD1800A型全液压动力头式钻机在青藏高原矿区内的应用效果,并对该型钻机在实际应用中的优点进行了分析;通过与国内外其它钻机的应用效果进行对比,认为CSD1800A型钻机是一款经济实用的中深孔钻机。     

Characteristics of Fengyun-4A Satellite Atmospheric Motion Vectors and Their Impacts on Data Assimilation

The high observation efficiency, scanning speed and observation frequency of the Fengyun-4A (FY-4A) satellite indicates the progress of Chinese geostationary meteorological satellites. The characteristics of FY-4A atmospheric motion vectors (AMVs) derived from the high-level water vapor (WV-High) channel, mid-level water vapor (WV-Mid) channel, and infrared (IR) channel of FY-4A are analyzed, and their corresponding observation errors estimated. Then, the impacts of single-channel and multi-channel FY-4A AMVs on RMAPS-ST (the Rapid-refresh Multi-scale Analysis and Prediction System—Short Term) are evaluated based on one-month data assimilation cycling and forecasting experiments. Results show that the observation errors of FY-4A AMVs from the three channels have an explicit vertical structure. Results from the cycling experiments indicate that the assimilation of AMVs from WV-High produces more apparent improvement of the wind in the upper layer, while a more positive effect in the lower layer is achieved by the assimilation of AMVs from IR. Furthermore, the assimilation of AMVs from IR is more skillful for medium and moderate precipitation than from other channels owing to the good quality of data in the lower layer in the AMVs from IR. Assimilation of FY-4A AMVs from the three channels could combine the advantages of assimilation from each individual channel to improve the wind in the upper, middle and lower layers simultaneously.     

从FY-4A卫星遥感数据和GFS资料估算全天空状况下的地表长波辐射通量

本文介绍一种利用FY-4A成像仪遥感数据和全球预报系统(GFS)资料估算全天空地表长波辐射通量的反演方法。该方法通过辐射传输模拟和统计回归计算建立云天地表下行长波辐射通量的反演模式,并基于GFS资料处理云覆盖地区的地表上、下行长波辐射通量。这种全天空状况下两种通量的反演结合了FY-4A晴空地表长波辐射业务产品和本文反演模式处理的云天地表上、下行长波辐射通量。2018年9月1日的处理结果与Aqua/CERES同类产品相对比,精度为:RMSE=20.52 W·m^-2,R=0.9481,Bias=3.3 W·m^-2(夜间地表下行辐射通量对比);RMSE=25.58 W·m^-2,R=0.9096,Bias=5.4 W·m^-2(白天地表下行辐射通量对比);RMSE=10.97 W·m^-2,R=0.9762,Bias=-3.3 W·m^-2(夜间地表上行辐射通量对比);RMSE=19.97 W·m^-2,R=0.9283,Bias=5.0 W·m^-2(白天地表上行辐射通量对比)。这些结果表明本文发展的方法能够反演出精度较好的云天上下行长波辐射通量资料,为今后利用FY-4后续星处理生成全天空状况下的地表长波辐射通量产品奠定了理论基础。     

采用双权重算法进行FY-3A微波湿度计资料质量控制试验

针对FY-3A卫星微波湿度计MWHS(Microwave Humidity Sounder)资料的质量控制进行研究.选用2010年冬季1月17-23日FY-3A微波湿度计MWHS LlC格式的全球观测资料作为研究对象,采用双权重算法对观测增量O-B进行质量控制,其中O是Fy-3A微波湿度计观测的亮度温度,B是基于NCEP GFS全球预报系统6h预报场用辐射传输模式RTTOV模拟的亮度温度值,目的是剔除受地表发射率或云影响的离群资料.结果表明,通过双权重的质量控制后,FY-3AMWHS3、4、5通道O-B的标准差明显减小了2～3K,同时,质量控制后O-B偏差和标准差随时间窗变化也很稳定,可见该方法除去异常资料的效果较为理想,能够应用到卫星资料的质量控制中.     

CINRAD/SA雷达灯丝电源调试与故障判定

详细叙述了CINRAD/SA雷达灯丝电源控制电路的工作状态,分析了控制电路中脉宽调制器SG1525A的特性,调试了控制斩波器的脉宽调制电路和振荡器控制电路的关键测试波形,并对灯丝电源输出电压、灯丝电压保护和灯丝电流保护进行了分步调试.根据实际经验总结了在灯丝电源调试过程中出现的故障判定流程和故障排查、排除方法,旨在为雷达灯丝电源的故障处理提供参考和借鉴.     

On the Multiplicity of the O-Star Cyg OB2 #8a and its Contribution to the γ-ray Source 3EG J2033+4118

We present the results of an intensive spectroscopic campaign in the optical waveband revealing that Cyg OB2 #8A is an O6+O5.5 binary system with a period of about 21.9 days. Cyg OB2 #8A is a bright X-ray source, as well as a non-thermal radio emitter. We discuss the binarity of this star in the framework of a campaign devoted to the study of non-thermal emitters, from the radio waveband to γ-rays. In this context, we attribute the non-thermal radio emission from this star to a population of relativistic electrons, accelerated by the shock of the wind-wind collision. These relativistic electrons could also be responsible for a putative γ-ray emission through inverse Compton scattering of photospheric UV photons, thus contributing to the yet unidentified EGRET source 3EG J2033+4118. Based partly on data Obtained at the Observatoire de Haute-Provence, France.     

辽东、辽西下石炭统孢粉组合特征

辽东、辽西石炭系（地台型）发育，化石丰富，是研究我国北方石炭系及矿产的理想地区。华北缺失下石炭统早已成“定论”，但笔者通过植物化石研究证实东北南部存在早石炭世地层无疑，并建立了Ｓｕｂ－ｌｅｐｉｄｏｄｅｎｄｒｏｎ－Ａｃｈａｅｏｃａｌａｍｉｔｅｓ－Ｃａｒｄｉｏｐｔｅｒｉｄｉｕｍｓｐｅｔｓｂｅｒｇｅｎｓｅ组合带。与此同时，作者又在辽东、辽西石炭系下部采到了丰富的孢粉化石共３６属７５种，并归结为Ｌｙｃｏｓｐｏｒａｐｕｓｉｌｌａ－Ｃｒａｓｓｉｓｐｏｒａｋｏｓａｎｋｅｉ组合，时代为早石炭世晚期，即维宪－纳缪尔Ａ期。从而孢粉、植物大化石互为佐证，进一步肯定辽东、辽西存在早石炭世地层，进而改写了华北地质史的内容，并对古构造、古地理的研究具有重要意义。另外，孢粉层位还发现了丰富的叶肢介化石，这是我国石炭纪的第３处叶肢介产地，对叶肢介的起源、演化及利用多门类生物化石解决石炭系的内部界线划分积累了资料。