| 1. | Study on characteristic of doppler frequency shifts in mobile satellite communications
移动卫星通信信道多普勒频移特性研究 |
| 2. | A method of correcting doppler frequency shift in mobile satellite communication systems
卫星移动通信系统多谱勒频移校正技术研究 |
| 3. | A approach for doppler frequency shift correction in multi - rate bpsk dbpsk software demodulatesystem
软件解调中多普勒频偏矫正的一种方法 |
| 4. | The characteristic of the time - variety channel may be represented by rayleigh fading and doppler frequency shift
这种信道的时变特性可用瑞利衰落和多普勒频移来表征。 |
| 5. | When the doppler frequency shift is big and the rayleigh fading is serious , it would affect the despread and demodulation algorithm of the signal badly
当多普勒频移较大,瑞利衰落严重时,将严重影响信号的解扩解调。 |
| 6. | A large doppler frequency shift estimation algorithm was proposed , which is called large doppler frequency shift estimation algorithm based on ar model
摘要给出了一种适用于卫星通信的大频偏估计算法，文中称之为基于ar模型的大频偏估计算法。 |
| 7. | In this paper , we analyze the reason that it is difficult to process the doppler frequency shift signal generated by low velocity moving target and discuss the kalmus filter performances for low velocity moving target detection
本文分析了低速目标的多普勒频移信号难以处理的原因，并讨论了kalmus滤波器（零速率波器）对低速运动目标的检测性能。 |
| 8. | 2 . doppler frequency shifting and curve fitting differential methods for measuring velocity are analyzed and compared . the least - squares curve fitting methods based on power functions and orthogonal functions are analyzed and compared
2 .对测量速度的两种方法,多普勒频移法和曲线拟合微分法作了分析和比较;对以幂函数族和以正交函数族为基底的最小二乘曲线拟合法作了对比分析。 |
| 9. | Base on the study of mobile communication channel characteristics , this thesis gives an analysis on the existing problems , such as multi - path fading and doppler frequency shift , and proposes a solution : implanting the ofdm technique in modulator
本文从对移动信道的特性研究出发，分析了其存在的问题，例如多径干扰、多普勒频移，然后针对这些问题提出了解决方案? ?采用ofdm技术作为核心技术来设计移动通信系统。 |
| 10. | First , the structure of the second generation ctdrs isl was discussed in this paper , the characteristic of coverage in the second generation ctdrs by the characteristic of orbit and the simulation model of isl was analyzed then the effect of the isl establishing process analyzed . second , the discussing and analyzing focus on the characteristic of signal during the establishing isl process , establishing the orbit model , the technology of doppler frequency shift capturing and tracking sequence and the effect of background noise , then the theory analyzing the parameters we have just mentioned , and this will support the reference for the implement of project . the simulation and test of the isl of ctdrs and analyzing from theoretical basis to implement of simulation were mainly focused in this paper
其中讨论了二代中继星捕获跟踪系统星间链路的仿真方案的组成结构,利用轨道特性对二代中继卫星系统的覆盖特性进行分析,搭建了星间链路的仿真模型,其中包括中继卫星和用户卫星在内的轨道模型、星间链路模型、用户星信号调制模型等,并对星间链路建立过程的影响进行分析;重点针对星间链路建立过程的信号特性,轨道模块的建立、多普勒频移技术、背景噪声影响、载波的捕获与跟踪技术等进行了实际参数的设计与理论分析。 |
