北斗导航卫星位置计算方法研究   总被引：1，自引：0，他引：1  

郝建录  刘智敏 《全球定位系统》2013,(5):5-10

为了提高北斗卫星轨道的精确性和实时性,在分析星历文件中的开普勒轨道参数和轨道摄动参数的基础上,阐述了卫星轨道计算方法,用VisualC＋＋语言编程实现了卫星轨道位置计算,并用2013年1月13日的北斗导航文件计算出1、5号GEO卫星和6、9号MEO／IGSO卫星位置及其它们外推时刻卫星的位置,通过对比分析,验证了该算法的可行性。  相似文献   

Reducing influence of gravity model error in precise orbit determination of low Earth orbit satellites     

Jinlai Guo  Min Hu  Qile Zhao  Daoyu Guo 《地球空间信息科学学报》2013,16(2):105-110

Based on the orbit integration and orbit fitting method, the influence of the characters of the gravity model, with different precisions, on the movement of low Earth orbit satellites was studied. The way and the effect of absorbing the influence of gravity model error on CHAMP and GRACE satellite orbits, using linear and periodical empirical acceleration models and the so-called “pseudo-stochastic pulses” model, were also analyzed.  相似文献   

Asymptotic Orbits at the Triangular Equilibria in the Photogravitational Restricted Three-Body Problem     

K. E. Papadakis 《Astrophysics and Space Science》2006,305(1):57-66

We study numerically the asymptotic homoclinic and heteroclinic orbits associated with the triangular equilibrium points L ₄ and L ₅, in the gravitational and the photogravitational restricted plane circular three-body problem. The invariant stable-unstable manifolds associated to these critical points, are also presented. Hundreds of asymptotic orbits for equal mass of the primaries and for various values of the radiation pressure are computed and the most interesting of them are illustrated. In the Copenhagen case, which the problem is symmetric with respect to the x- and y-axis, we found and present non-symmetric heteroclinic asymptotic orbits. So pairs of heteroclinic connections (from L ₄ to L ₅ and vice versa) form non-symmetric heteroclinic cycles. The termination orbits (a combination of two asymptotic orbits) of all the simple families of symmetric periodic orbits, in the Copenhagen case, are illustrated.  相似文献   

Models of Motion in a Central Force Field with Quadratic Drag     

Mayer Humi  Thomas Carter 《Celestial Mechanics and Dynamical Astronomy》2002,84(3):245-262

Some general properties for the motion of a particle in a central force field with a general power law drag are derived. Exact and approximate solutions of the equations of motion are found in various cases. Emphasis is placed on inverse square gravitation and drag that varies with the square of the speed and inversely with the distance from the center of attraction. For this model two results stand out. The first is a particular solution in closed form that demonstrates the decay of an initially circular orbit under drag. The second, found from an approximation of the equations of motion when the radial speed is small compared with the tangential speed, demonstrates the decay of an initially elliptic orbit that is not highly eccentric. Formulas for calculation of the time of flight are presented for the two principal results.  相似文献   

ASTROD 1中的望远镜前指量研究     

宋凤刚  熊耀恒  倪维斗 《天文研究与技术》2007,4(3):243-248

单航天器激光天文动力学空间计划ASTROD1是激光天文动力学ASTROD的第一步,通过发射绕太阳的无拖曳航天器,并且当航天器处于太阳背面附近时,与地面站进行深空激光测距,以执行科学任务。该文计算了ASTROD12015年的轨道、提出了判断轨道精度是否满足任务需要的方法、分析了地球和航天器的位置同望远镜前指量之间的关系并且给出了望远镜前指量的结果。  相似文献   

GPS /VRS����ʵʱ���ܹ�������㷨�о�   总被引：1，自引：0，他引：1  

李成钢  黄丁发  周东卫  周乐韬  熊永良  徐锐 《大地测量与地球动力学》2007,27(1):96-99

??????????????????GPS/VRS????????,??????IGS?????????????GPS?????????????????????????GPS/VRS????ο???????VRS?????????????????????????GPS???????вο?????磨SGRSN????????????GPS??????磨SCIGN????????????????????????г?????????????????????????·??????и??????????????????????????????????0.004??10 ^-6??????????100 km?????RTK??λ??????????????????GPS/VRS????????????RTK??λ???????????????  相似文献   

Numerical exploration of the photogravitational restricted five-body problem     

K. E. Papadakis  S. S. Kanavos 《Astrophysics and Space Science》2007,310(1-2):119-130

We study numerically the restricted five-body problem when some or all the primary bodies are sources of radiation. The allowed regions of motion as determined by the zero-velocity surface and corresponding equipotential curves, as well as the positions of the equilibrium points are given. We found that the number of the collinear equilibrium points of the problem depends on the mass parameter β and the radiation factors q _i , i=0,…,3. The stability of the equilibrium points are also studied. Critical masses associated with the number of the equilibrium points and their stability are given. The network of the families of simple symmetric periodic orbits, vertical critical periodic solutions and the corresponding bifurcation three-dimensional families when the mass parameter β and the radiation factors q _i vary are illustrated. Series, with respect to the mass (and to the radiation) parameter, of critical periodic orbits are calculated.  相似文献   

用改进的SPEA求解轨道转移的时间-能量极小化问题   总被引：3，自引：0，他引：3  

王石  戴金海 《天文学报》2003,44(2):197-203

提出了改进的SPEA，这是一种多目标进化算法，适于求解大尺度空间的多目标优化的Pareto最优解，并应用于求解轨道转移的时间—能量极小化问题，计算结果表明算法的有效性。  相似文献   

轨道改进中插值系数的计算     

汤锡生 《天文学报》2002,43(2):221-222

数值法精密定轨在多步法积分产生轨道和插值法计算观测量和偏导数中,需要反复迭代来完成对航天器的历元状态的微分修正.严格地说插值的使用是合理的,但是重复的插值系数计算,对于有限的计算机资源来说,是一种负担.一次性插值技术的应用,将有利于在轨道改进中涉及的观测时刻的逐个处理的内循环和完成内循环反复迭代的外循  相似文献   

关于空间探测器定位在太阳系中特殊点上的有关问题     

刘林  侯锡云  王建峰  王海红 《天文学进展》2005,23(2):180-189

WSO／UV(世界空间紫外天文台)以及监测太阳活动的特殊探测器(Solar Sentinel)都需要在日-地(月)系的平动点附近运行，且相对日-地(月)系要求其几何位置几乎保持不变，因此有必要阐明平动点的动力学特征及其附近的运动状况。基于这一点，对限制性三体模型下，日-地(月)系中平动点附近扰动运动的稳定性作了详尽的分析，尤其讨论了共线平动点具有不稳定动力学特征时，如何使WSO／UV这类空间探测器保持在其附近的情况；同时阐明了轨道保持不变的条件和相应的轨控措施。  相似文献