| 1. | At the end , this paper introduce s the application development of navstar gps
最后还介绍了导航星全球定位系统的应用情况。 |
| 2. | The volume of the navigation star database is large when star map recognition is carried out by kmp algorithm
摘要用kmp算法进行星图识别时，制定的导航星库容量大。 |
| 3. | Abstract : this paper introduces the constitution , functions and development process of na vstar gps in detail
文摘:较详细地介绍了导航星全球定位系统（ gps ）的组成、功能和发展过程。 |
| 4. | The thesis is a research work based - on star sensor about star identification algorithm , construct of guide star database , attitude calculation method
本文研究基于星敏感器的星识别算法、导航星库的构造方法和姿态计算方法。 |
| 5. | Based on coarse data of positions of user and satellite , estimation algorithms of propagation delay between different satellites and users are given
基于用户和卫星的概略位置，给出了适用于不同类型导航星和不同用户场景的卫星信号传播时延估计算法。 |
| 6. | Star pattern recognition is to confirm the corresponding relations between the star map of observed stars in field of view ( fov ) of star sensor and the star map of guide stars
星图识别就是将星敏感器视场中观测星组成的星图与导航星组成的星图进行特征匹配以确定观测星与被测星的对应关系。 |
| 7. | The simulation results show that the algorithm not only inherits the advantages of the original algorithm , but also both volume of the navigation star database and recognition time are equivalent to 1 / 4 that of the original algorithm
仿真结果表明本算法不但继承了原算法的优点，而且导航星库的容量和识别时间都是原算法的1 / 4 。 |
| 8. | Simulation results indicate that the algorithm can reduce the delay ' s uncertainty range greatly , even with great position errors the uncertainty range still can be reduced to the half , and is effective for the fast acquisition of long cycle code
数值计算表明，算法能够大大压缩不同导航星和不同场景用户之间传播时延的不确定范围，即使在用户与卫星位置误差较大的恶劣应用背景下也能将不确定范围压缩一半，从而有效地辅助长码快捕的实现。 |
| 9. | The thesis develops new techniques on the basis of the relating documents - - construct of reduced 2 - d indexed layered guide star database . the database is a uniform storage reduced guide star database with improved 2 - d index it divides guide stars to local bright star ( lbs ) and local dim star ( lds ) , and gives priority to lbs in making star triangle to reduce the number of stored triangles . it uses 2 - d na index and linear storage to improve the hit the target rate , save the memory for index
精简二维索引分层导航星库，作为一种统一存储的精简、索引导航星库，采用星的分层方法精简导航星库，以局域亮星为主构造导航星三角形，减少了星三角形的数量，节约了存储空间；采用索引方法检索导航星三角形，提高了命中效率，节约了搜索时间；采用n划分和线性存储的方法精简索引，提高了二维索引的存储效率；采用索引的边缘扩充方法，可以在一定程度上减少位置误差的影响。 |
