定轨

Furthermore, a strategy of precise orbit determination for lunar satellites is presented, which combines analytical and numerical methods. It is assessed to be reliable and practical.

在此基础上，建立了一种数值方法和分析方法相结合的月球卫星精密定轨方法，并以仿真计算证实了方法的可靠性与应用前景。

In this paper,the scheme of autonomous orbit determination of satellite is described,the extended Kalman filter algorithm based on improved numerical method is put forward.

高精度的自主定轨对探测器实现深空探测任务有着重要的意义，结合利用星光折射角的测量确定卫星轨道的自主导航方案，提出了基于数值算法改进的扩展卡尔曼滤波算法，提高了运算精度，通过仿真验证了该算法的优越性。

Both problems are popular topics in the field of orbit support for space mission.

本文是有关航天工程预研课题中的一部分，以航天器轨道力学为基础，结合一些具体的航天应用背景，对天地基联合定轨方法和月球探测器轨道支持这两个目前航天任务轨道支持的热点问题作了相应的分析和研究。

SLR is one of the important space geodetic advanced techniques. It provides precise range between a laser station and a satellite that is equipped with retroreflectors. In the dissertation, the precis orbit determination on SLR technique is researched.

SLR技术是现代空间大地测量最先进技术之一，它可以为人造卫星提供精密的距离观测，本文系统地研究了SLR技术在卫星精密定轨中的有关技术问题。

In view of the practice of precise orbit determination and parameter solution, the difference algorithm to compute state transition matrix is proposed.

根据精密定轨和参数解算的实际需要，提出用差分算法，即通过两条很接近的轨道的差来计算状态转移矩阵。

In this model, a parameterized method has been employed to decrease or eliminate vertical deflection and vertical refraction errors.4 For the long baselines of Crustal Movement Observation Network of China, using the GPS satellites orbits and stations positioning analysis software GAMIT opened up by MIT to do the single day GPS observation data processing, a synthetic solution model, which is called "the synthetic solution model of baseline vectors", has been built up with several single day baseline vectors calculated by the GAMIT software, to compute the three dimension movement velocities of sites.

对于长基线的GPS地壳变形监测网，采用MIT开发研制的精密GPS定轨定位软件GAMIT进行单天GPS观测数据的处理，提出了利用多期单天的GAMIT解算出的基线向量进行综合解算的模型："基线向量综合解算模型"，用以计算地壳监测站点的漂移速度，并通过实例验证了该计算模型的正确性和可靠性。

The result indicates that the accuracy of automatically determining orbits is better than that from GPS broadcasting ephemerides.

模拟结果表明，在空间测距精度一定的情况下，自主定轨精度能高于GPS广播星历，因而能较精确地维持卫星系统的坐标框架。

This paper focus as on the Accuracy Analysis of orbit determination for the on-going Chinese lunar exploration mission 'Chang Er 1', using the joint tracking network of USB and VLBI with real network geographic distribution scenario and considering both systematic and stochastic measurement noise. The whole flight orbit of the Charng Er 1' includes Phasing orbit, Translunar orbit and Mission orbit.

本文以我国正在实施的探月计划&嫦娥1 号&工程为背景，分析了在我国USB 测控网和VLBI 跟踪网的现有空间分布、观测弧段和尽可能接近真实情况的误差源等前提下的探月飞行器的精密定轨。

He was chosen by skipping the established procedure of casting lots from the Gold Bottle.

事实证明，没经过金瓶掣签的定轨，果然就出了错。

For the orbit estimation algorithm based on the measurement of the geomagnetic field vector,when measurement data influenced by outliers,filtering advents deviation,convergence becomes slow and even diffuses.

近地轨道由于有丰富的地磁场资源，且具有相当好的地磁场模型，可以采用高斯球谐函数来描述地磁场模型，这样磁场的强度和方向是位置的函数，因此能采用磁测的方法对卫星进行定轨导航[1，2]。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失