天文

The research result indicates that the precision is satisfied for the need of celestial navigation .

研究结果表明，其精度完全能满足航海天文导航的精度要求。

Historically, accurate knowledge of the positions of the Sun, Moon, planets and stars has been essential in celestial navigation .

从历史上看，知识的准确位置的太阳，月亮，行星和恒星已基本在天文导航。

And practical astronomy, a branch of applied aviation, an aircraft technology, the theoretical basis for celestial navigation.

实用天文学应用于航空领域的一个分支，是飞机天文导航技术的理论基础。

In order to test the performance of identification algorithm, shorten the development cycle of star sensor, as well as reduce the cost and improve the efficiency of development, a new type of hybrid simulation system for celestial navigation was proposed.

从检验星敏感器性能、加快其样机研制周期、降低成本、提高效率的目的出发，设计构走了一个实用性强的天文导航半物理仿真系统；着重介绍了此系统的组成、结构和各模块的功能：叙述了系统的实现方法和相关性能指标。

It is called celestial navigation.

它叫做天文导航。

The result of simulation indicates ballistic missile INS/GNSS integrated navigation system aided with celestial navigation can substantially improve the naviga...

仿真结果表明：采用天文导航系统对弹道导弹的INS/GNSS组合导航系统进行辅助将大幅度提高导弹的导航精度，具有重要的实际意义。

In this paper, the basic mathematical model was derived by means of two methods, the first is the twostar positioning algorithm in celestial navigation theory and the second is based on the gyro dynamics theory. The results from these two methods are identical and therefore are correct. The latitude is equal to the elevation-angle of the polar gyro. The course is the ideal output from the sensor fitted to the outer gimbal. The longitude is a function of the equator gyro's azimuth and elevation angles.

本论文用天文导航中的双星定位法和经典的陀螺力学原理两种方法建立了ESGM的基本数学模型，并且得到一致的结果，说明所建模型是正确的，即载体的纬度等于极轴陀螺主轴相对水平面的高度角，载体的航向等于极轴陀螺外环轴上角度传感器的理想输出，载体的经度是赤道陀螺的方位角和高度角的函数。

In order to test the performance of identification algorithm,shorten the development cycle of star sensor,as well as reduce the cost and improve the efficiency of development,a new type of hybrid simulation system for celestial navigation was proposed.

由于航天实验费用大，为测试星敏感器性能和星图识别算法，需在地面构建天文导航半物理仿真试验平台。

Since the approach has been coded into the program, if it can be combined with the predication system of the nautical almanac data, the combined two systems can be further developed in a commercial package and dramatically improve the training or education of the current celestial navigation.

本法因已将理论透过数值计算，若能再结合航海历资料库预测系统，未来将可进一步发展成商用套装软体，改善目前商船教育训练或海上实务作业上天文航海的现况。

Large initial state error and non-Gaussian distribution of state may exist in the deep-space autonomous celestial navigation, so based on the classic six orbit elements, an orbit determination method for deep-space probe is proposed by using starlight angle as measurement information and the unscented particle filter algorithm.

针对深空自主天文导航中可能存在初始状态误差较大、状态分布非高斯分布等问题，基于轨道6根数描述形式，提出了利用星光角距观测信息和UPF算法确定探测器轨道的方法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。