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低轨卫星激光测距轨道预报方法及精度分析 被引量:3
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作者 王磊 赵春梅 +1 位作者 何正斌 马天明 《导航定位学报》 CSCD 2021年第4期24-31,共8页
为了进一步提高卫星激光测距(SLR)站对低轨卫星轨道预报的精度,提出一种低轨卫星轨道预报方法:分析星载全球定位系统(GPS)定轨结果外推和瞬时轨道根数预报2种方法的可行性;并进一步研究常经验加速度和伪随机脉冲对星载GPS结果外推精度... 为了进一步提高卫星激光测距(SLR)站对低轨卫星轨道预报的精度,提出一种低轨卫星轨道预报方法:分析星载全球定位系统(GPS)定轨结果外推和瞬时轨道根数预报2种方法的可行性;并进一步研究常经验加速度和伪随机脉冲对星载GPS结果外推精度的影响,以及辐射压参数和伪随机脉冲参数对瞬时轨道根数预报精度的影响。实验结果表明:星载GPS定轨结果外推采用伪随机脉冲比常经验加速度解算出来的轨道根数外推精度更高,5 d的预报结果为,T方向差值优于350 m,且比瞬时轨道根数预报的轨道精度更稳定;瞬时轨道根数预报添加之前定轨解算出来的辐射压参数拟合轨道,能有效提高轨道预报的精度,2 d的预报结果为,T方向差值整体在300 m之内,符合激光测距要求。 展开更多
关键词 卫星激光测距 低轨卫星 轨道预报 精密定轨 辐射压参数 伪随机脉冲参数
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Peristaltic flow with convective mass condition and thermal radiation 被引量:1
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作者 F.M.Abbasi T.Hayat +1 位作者 B.Ahmad B.Chen 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2369-2375,共7页
The primary objective of present investigation is to introduce the novel aspects of convective mass condition and thermal radiation in the peristaltic transport of fluid. Magnetohydrodynamic(MHD) fluid was considered ... The primary objective of present investigation is to introduce the novel aspects of convective mass condition and thermal radiation in the peristaltic transport of fluid. Magnetohydrodynamic(MHD) fluid was considered in a symmetric channel. Heat and mass transfer characteristics were analyzed in the presence of Soret and Dufour effects, and the results were presented via two forms of thermal radiation. The temperature, concentration and pressure rise per wavelength were examined. It is observed that the velocity slip and magnetic field parameters have opposite effects on the pressure rise per wavelength. Temperature of fluid is a decreasing function of the radiation parameter. Further, the temperature of fluid decreases by increasing the heat transfer Biot number. It is notified that the heat transfer rate at the wall is a decreasing function of radiation parameter. 展开更多
关键词 convective mass condition thermal radiation magnetohydrodynamic (MHD) fluid
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