多普勒频移

一种基于多普勒频移的GPS自适应滤波算法研究

Research on an adapted filtering algorithm based on Doppler shift

从不同的多径信道和多普勒频移等方面对智能天线OFDM系统进行了全面的分析验证。

A comprehensive analysis and verification of smart antenna OFDM system is conducted with different multi-path channel and Doppler shift , and other aspects .

利用GPS多普勒频移观测量可以获得高精度的速度测量结果。

The precise velocity can be derived with GPS Doppler measurements .

基于多普勒频移的k跳分簇算法设计与仿真

Design and Simulation of Doppler Value-based K Hop Clustering Algorithm

GPS系统多普勒频移估算的研究

Research on Doppler Frequency - shift Estimation of GPS

载体的动态性所引入的多普勒频移给GPS接收机的载波跟踪带来了很大的困难。

It is difficult for GPS receivers in dynamic environments to realize carrier tracking .

SAR卫星多普勒频移偏航导引补偿效果分析

The Effect Analysis of Yaw Steering ′ s Compensation for Doppler Shift of SAR Satellite

MIMO系统中基于野值剔除的最大多普勒频移估计

Maximum Doppler Shift Estimation Based on Illegal Data Elimination in MIMO Systems

宽带CDMA系统中最大多普勒频移估计方法的研究

Study on the estimation methods of maximum doppler frequency in wideband CDMA system

第二部分分析多普勒频移对GPRS的影响。

The second part analysed the effect to GPRS by doppler - shift .

研究了多普勒频移以及GPRS本身的抗误码性能；

Research the doppler-shift and the performance of GPRS anti - harm code ;

针对P码多普勒频移大、周期长的特点，本文探讨了缩短载频搜索范围的方法。

According to P-code features of large Doppler frequency shift and long code period , the method that shortens the scope of carrier frequency search is studied .

但是限于正交性的限制，OFDM对于多普勒频移表现的更为敏感。

However , the orthogonality restriction makes that there is more sensitivity to Doppler Shift in OFDM .

WCDMA系统中基于多普勒频移估计的信道估计方法

Channel estimation based on Doppler frequency estimation for WCDMA systems

线性调频信号（ChirpSignal）长期以来被用于雷达系统中，它以其抗干扰、抗多普勒频移、抗多径衰落、低功耗和系统结构简单等优势，越来越受到人们的重视。

The chirp signal has been used in RADAR system with its resistance of interference , Doppler Effect and multi-path fading .

与此同时，阐述了比特翻转以及多普勒频移对捕获过程产生的影响，并推导了可用于P码捕获的最大数据长度。

Meanwhile , the influence of bit reversal and Doppler frequency shift on the acquisition process is expatiated and the maximum data length for precision code acquisition is evaluated .

GPS高精度定位结果、原始多普勒频移观测量，以及由载波相位中心差分而获得的多普勒频移观测值，它们都可以用来获得高精度的速度测量结果。

The precise velocity can be derived respectively with precise positioning results , receiver raw Doppler measurements and carrier phase derived Doppler measurements .

在OFDM系统中，影响其性能的一个重要参数就是最大多普勒频移。

The maximum Doppler frequency shift is an important parameter which affects the performance of the OFDM system .

高动态环境会造成较大的多普勒频移，这使得一般的GPS接收机在没有外界辅助的情况下难以可靠工作。

High dynamic environment may cause a large Doppler shift , thus the general GPS receiver is difficult to work reliably without outside assistance .

为了有效的联合估计在脉冲噪声存在时的时延和多普勒频移，给出了一种基于p阶循环模糊函数的方法。

For jointly estimating time delays and Doppler shifts in the presence of impulse noise , a new algorithm is proposed , which utilizes the p th order cyclic ambiguity function .

本文在介绍GPS基本原理的基础上，主要研究GPS多普勒频移估算的方法和GPS绝对定位算法。

Based on the principles of GPS system , the Doppler Frequency-shift Estimation of GPS and absolute positioning algorithms have been studied in this thesis .

高速移动环境下WiMAX系统多普勒频移估计技术研究

Study on Doppler shift estimation Technologies of WiMAX in High-Speed Mobile Communications

在DSP器件中利用功率谱估计的方法计算出多普勒频移，即可得到车辆运动的速度。

Doppler frequency is calculated by spectrum estimating means in DSP chip , and then vehicles ' speed can be calculated by this Doppler frequency .

π/4-DQPSK调制方式的优点是频率利用率高且抗多普勒频移，它也是TETRA系统主要使用的调制方式。

It is also the main used modulation in TETRA system .

Rake接收机中信道最大多普勒频移估计的一种新方法及其在信道估计中的应用

A Novel Estimation Method of Maximum Doppler Frequency in Rake Receiver and its Application in Channel Estimation

讨论了利用GPS多普勒频移观测值确定运动载体速度的基本原理，估计出采用这一方法可以达到的精度。

The basic principle for determining the speed of moving vehicles with GPS Doppler observed values is discussed , and the available accuracy with this method is presented .

短波地空通信多普勒频移对DTMF信号解码影响

Effect to DTMF decoding of Doppler shift in ground-air HF communication

下变频后的全球定位系统信号覆盖了发生多普勒频移的全球定位系统载波频率的整个范围。根据本文的一些基本原理，对这一经过下变频的全球定位系统信号的采样进行N点傅立叶变换。

According to the principles of the paper , an N-point fourier transform is performed on samples of a down converted GPS signal representing the entire range of Doppler-shifted GPS carrier frequencies .

一种含多普勒频移BPSK信号的解调方法

Demodulate Method of BPSK Signal With Doppler Shift

尤其在高速移动环境下，多普勒频移和多普勒扩展明显，频率偏差使OFDM系统子载波间的正交性遭到破坏，产生子载波间干扰（ICI），这将大大降低系统性能。

Frequency offset destroys the orthogonality between OFDM sub-carriers , which brings about inter-carrier interference ( ICI ), resulting in performance degradation .