| 1. | Real - time estimation of doppler frequency offset in leo mobile satellite communication
低轨卫星的多普勒频移实时估计 |
| 2. | Chapter 2 studies the principle of the leo satellite cdma transmission system
第二章研究了低轨卫星cdma传输系统的原理。 |
| 3. | Kinematic orbit determination of low - earth orbiters based on gps precise point positioning technique
精密单点定位的低轨卫星几何法定轨 |
| 4. | In this text we will discuss the principle and implementation of a leo satellite cdma transmission system
本文讨论低轨卫星cdma传输系统的原理和实现。 |
| 5. | The losses of performance of leo constellation are analyzed with the help of simulation
本文还利用仿真方法对在轨运行的低轨卫星星座的性能损失情况进行了分析。 |
| 6. | Chapter 2 studies the doppler - range positioning algorithm and tdoa - tdof positioning algorithm which are appropriate to leo satellite constellation
第二章研究了适用于低轨卫星的doppler - range联合定位法及tdoa - tdof联合定位法。 |
| 7. | A methodology for defining fixed location area in leo satellite system for users , which has independent positioning capability is proposed in this paper
摘要针对基于低轨卫星系统中具有自主定位能力的特殊终端用户，提出地面位置区划分策略。 |
| 8. | The development of researches and application techniques such as gravity filed recovery and atmosphere sounding by on board gps receivers pose very high requirements on precise orbit determination ( pod ) of low - earth - orbiters ( leos )
借助低轨卫星上搭载的仪器而展开的科学研究及各种应用技术的迅猛发展，对低轨卫星定轨精度提出了越来越高的要求。 |
| 9. | According to the mean message traversal , the performance of leo / meo mobile satellite communication networks with intersatellite links ( isls ) is analyzed in this paper . three different traffic patterns are used in the analysis . if the isl number per satellite increases , the advantage of packet switch is more significant than that of circuit switch
本文提出了一种基于信息平均传输距离的中/低轨卫星移动通信系统星际链路网络性能的分析方法.根据三种不同的业务分布模型对繁/简两种网络的信息过网时延和呼叫丢失率进行了分析.通过增加网络中每个节点星际链路的数目可以改善网络的性能，而且这种改善对采用分组交换的系统比采用电路交换的系统大 |
| 10. | Unfortunately , the technique of gps - based orbit determination ( od ) ( also called kinematic od ) using gps observations especially carrier - phase measurements in our country is relatively weak . so the theory , methods and some key issues of kinematic orbit determination are discussed in this dissertation : 1 a new data pre - processing method of kinematic od is proposed in general , all cycle slip detection procedures are dependent ( implicitly or explicitly ) on analyses of least square ( ls ) pattern of the data from epoch to epoch . but unfortunately , the ls residuals cannot correctly reflect the location and sizes of gross errors because of ls sharing out the gross errors to each observation equally
考虑到星载gps低轨卫星几何法定轨在我国发展还相对缓慢，特别是基于载波相位的相对定轨的发展相对滞后的特点，本文系统研究了星载gps低轨卫星轨道确定中的理论、方法，对以下一些关键问题作了有益的探索： (一)提出了一种gps数据预处理方案现有gps数据预处理方法大都以最小二乘残差为研究对象，往往会造成粗差及周跳定位不准的问题。 |
