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921.
根据斯托克斯参量计算偏振度的方法,设计了光学镜头偏振度测量仪。光学镜头偏振度测量仪采用模块化结构设计,共分为光源系统、准直光学系统、载物转台、探测系统以及后续的信号处理和计算控制系统等五部分。测量透过被测量光学镜头的光分别在0,45,90,135振动方向光信号大小τH,τ45,τV,τ135,以及左旋圆偏振光、右旋圆偏振光信号的大小礼,Jr尺,计算出光学镜头的偏振度;通过对测量装置的分析,找出了影响测试结果的几个因素,并由此分析了不确定度的来源,建立了测量不确定度的数学模型,得到了装置的扩展不确定度约为0.5%。 相似文献
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923.
LIU Fa-min DING Peng SHI Wei-mei WANG Tian-min 《中国航空学报》2007,20(2):162-167
The TiO2-Co-TiO2 sandwich films were successfully grown on glass and silicon substrata making alternate use of radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and properties of these films were identified with X-ray diffraction (XRD), Raman spectra and X-ray photoemission spectra (XPS). It is shown that the sandwich film consists of two anatase TiO2 films with an embedded Co nano-film. The fact that, when the Co nano-film thickens, varied red shifts appear in optical absorption spectra may well be explained by the quantum confinement and tunnel effects. As for magnetic properties, the saturation magnetization, remnant magnetic induction and coercivity vary with the thickness of the Co nano-films. Moreover, the Co nano-film has a critical thickness of about 8.6 nm, which makes the coercivity of the composite film reach the maximum of about 1413 Oe. 相似文献
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927.
针对GPS应用于高轨卫星定位面临的远近效应问题, 提出利用正交相关的联合极大似然估计算法来对GPS信号进行二维搜索, 可以得到正确的码延时及多普勒估计. 极大似然估计算法首先利用滑行相关法对仿真信号中的强信号进行搜索, 得到强信号模型, 然后利用正交相关去掉强信号, 最终实现对弱信号的正确捕获. 本文对高轨卫星接收到的GPS信号进行了功率分析, 并建立了信号模型, 进行了算法仿真. 结果表明, 这种估计算法能够提高二维搜索性能, 有效解决远近效应问题. 相似文献
928.
全球导航卫星系统(GlobalNavigationSatelliteSystem,GNSS)应用于高轨航天器时,因轨道高于导航卫星,可见星数量急剧减少,空间信号功率微弱,信号的快速捕获和跟踪十分困难。文章对高轨地球同步轨道(GeosynchronousEarthOrbit,GEO)接收技术进行了研究。以中国实践十七号卫星为研究对象,采用官方正式发布的发射天线方向图对GEO下GNSS信号特征及可用性开展研究分析,并针对高轨道航天器GNSS信号微弱的特点,采用长时间积分处理的梳状滤波方法、差分相干累加比特同步算法和基于动力学模型补偿的扩展卡尔曼滤波自主定轨算法设计GNSS接收机,并在半物理仿真平台进行了测试验证。试验结果表明:GNSS接收机捕获灵敏度优于-173dBW,跟踪灵敏度优于-175dBW,定轨位置精度优于50m,速度精度优于0.01m/s。 相似文献
929.
K. Wang A. Khodabandeh P.J.G. Teunissen 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(1):148-159
Various studies have been performed to investigate the accuracy of troposphere zenith wet delays (ZWDs) determined from GPS. Most of these studies use dual-frequency GPS data of large-scale networks with long baselines to determine the absolute ZWDs. For small-scale networks the estimability of the absolute ZWDs deteriorates due to high correlation between the solutions of the ZWDs and satellite-specific parameters as satellite clocks. However, as relative ZWDs (rZWDs) can always be estimated, irrespective of the size of the network, it is of interest to understand how the large-scale network rZWD-performance of dual-frequency GPS using an ionosphere-float model compares to the small-scale network rZWD-performance of single-frequency GPS using an ionosphere-weighted model. In this contribution such an analysis is performed using undifferenced and uncombined network parametrization modelling. In this context we demonstrate the ionosphere weighted constraints, which allows the determination of the rZWDs independent from signals on the second frequency. Based on an analysis of both simulated and real data, it is found that under quiet ionosphere conditions, the accuracy of the single-frequency determined rZWDs in the ionosphere-weighted network is comparable to that of the large-scale dual-frequency network without ionospheric constraints. Making use of the real data from two baselines of 15?days, it was found that the absolute differences of the rZWDs applying the two strategies are within 1?cm in over 90% and 95% of the time for ambiguity-float and -fixed cases, respectively. 相似文献
930.
Characterization of GPS-TEC over African equatorial ionization anomaly (EIA) region during 2009–2016
Temitope Seun Oluwadare Chinh Nguyen Thai Andrew Oke-Ovie Akala Stefan Heise Mahdi Alizadeh Harald Schuh 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(1):282-301
This study characterizes total electron content (TEC) measured by Global Positioning System (GPS) over African equatorial ionization anomaly (EIA) region for 2009–2016 period during both quiet geomagnetic conditions (Kp?≤?1) and normal conditions (1?>?Kp?≤?4). GPS-TEC data from four equatorial/low-latitude stations, namely, Addis Ababa (ADIS: 9.04°N, 38.77°E, mag. lat: 0.2°N) [Ethiopia]; Yamoussoukro (YKRO: 6.87°N, 5.24°W, mag. lat: 2.6°S) [Ivory Coast]; Malindi (MAL2; 3.00°S, 40.19°E, mag. lat: 12.4°S) [Kenya] and Libreville (NKLG; 0.35°N, 9.67°W, mag. lat: 13.5°S) [Gabon] were used for this study. Interesting features like noontime TEC bite-out, winter anomaly during the ascending and maximum phases of solar cycle 24, diurnal and seasonal variations with solar activity have been observed and investigated in this study. The day-to-day variations exhibited ionospheric TEC asymmetry on an annual scale. TEC observed at equatorial stations (EIA-trough) and EIA-crest reach maximum values between ~1300–1600 LT and ~1300–1600 LT, respectively. About 76% of the high TEC values were recorded in equinoctial months while the June solstice predominantly exhibited low TEC values. Yearly, the estimated TEC values increases or decreases with solar activity, with 2014 having the highest TEC value. Solar activity dependence of TEC within the EIA zone reveals that both F10.7?cm index and EUV flux (24–36?nm) gives a stronger correlation with TEC than Sunspot Number (SSN). A slightly higher degree of dependence is on EUV flux with the mean highest correlation coefficient (R) value of 0.70, 0.83, 0.82 and 0.88 for quiet geomagnetic conditions (Kp?≤?1) at stations ADIS, MAL2, NKLG, and YKRO, respectively. The correlation results for the entire period consequently reveals that SSN and solar flux F10.7?cm index might not be an ideal index as a proxy for EUV flux as well as to measure the variability of TEC strength within the EIA zone. The estimated TEC along the EIA crest (MAL2 and NKLG) exhibited double-hump maximum, as well as post-sunset peaks (night time enhancement of TEC) between ~2100 and 2300 LT. EIA formation was prominent during evening/post-noon hours. 相似文献