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赵海涛朱洪波刘南杰杜艾芊 《数据采集与处理》2016,31(6):1178-1184
为满足车联网中定位精度的要求,
本文提出了一种伪距双差车辆相对定位算法,该算法通过车辆间伪距信息的车到车(Vehicle-to-vehicle,V2V)交互,抵消了公共误差及不同接收机的时钟偏移量,提高了伪距双差的车辆定位精度。通过对比分析伪距双差算法与全球定位系统(Global position system,GPS)单点定位算法的距离误差均方根,证明了伪距双差算法的定位精度。仿真结果表明采用伪距双差算法(Double differencing relative,DDR)
的相对定位技术在公共可见卫星
数大于4时,其相对定位性能优于GPS单点定位方法。 相似文献
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通过研究GPS与北斗组合系统伪距单点定位,利用平滑伪距的方法提高了组合系统伪距单点定位的精度。本文首先采取了P码对C/A码伪距单点定位进行修正,之后利用常用的Hatch滤波模型,利用载波进行伪距平滑,但对Hatch滤波解算进行了改进,也是本文的核心部分,单一频率分段滤波,不需要求解整周模糊度和电离层改正的基础上,降低定位时间和成本的基础上,精度提高,速度更快,对观测时间要求更低。 相似文献
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差分GPS定位技术是通过基站与移动站之间的空间相关性,来消除公共误差部分,以提高定位精度。伪距差分是目前用途最广的一种定位技术,文章详细列出了GPS伪距差分解算模型的数据处理算法,对于伪距差分中的有关问题提出了改进模型,该模型降低了对基准站接收机时钟的要求。由于基准站的精确坐标已经知道,在计算卫星坐标时,要计算接收机钟差,因此基准站的接收机钟差可以精确获得。 相似文献
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GPS positioning accuracy in indoor and urban canyons environments is greatly affected by multipaths due to distortions in
its autocorrelation function. In this paper, the first sidelobe of Pseudorandom Noise (PN) code autocorrelation is studied
and a new multipath mitigation technique based on PN code autocorrelation function is presented. This new technique relies
on the detection of the partial autocorrelation function that is affected by multipath signals. The increase in fractional
delay of the line-of-sight (LOS) signal is calculated. Simulation results indicate that the proposed technique has superior
performance compared with the 0.1-chip-spacing narrow correlator on mitigating multipath signals, especially the short-delay
multipath signals.
Zhang Zhen obtained his Bachelor’s Degree from Beijing Information and Technology Institute in 1999, Master’s Degree from Tsinghua University,
Beijing China, in 2002. He now is a Ph.D. student in Nanyang Technological University. Currently he also works as a Research
Associate in the Positioning and Wireless Technology Center (PWTC), NTU. His research interest includes multipath mitigation
for GPS, software GPS receiver design, indoor GPS as well as Ultra Wide Band (UWB) based ranging systems.
C. L. Law is an Associate Professor in School of EEE, NTU and the Director of PWTC. Dr. Law’s current research area is in Wireless
Networks. His research topics are in microwave integrated circuits, indoor wireless channel modeling, analysis of indoor wireless
LAN performances and in techniques for overcoming the time-dispersion distortions in high speed wireless LAN.
E. Gunawan is an Associate Professor in School of EEE, NTU and his research interest includes Error Correction Codings, Modeling of
Cellular Communications Systems, Power Control for CDMA Cellular Systems, MAC Protocols, Multicarrier Modulations, Multiuser
Detections, Space-time Coding, Radio-location Systems, UWB and its applications for Human Body Vital Signs Detection, and
Powerline Communications. 相似文献
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超声波测距是一种非接触测量方式,在工业、交通等行业应用广泛。 为提高超声波的测距量程,解决多通道在通道间距
离较近时的串扰噪声问题,在不改变电声转换器与发射接收硬件电路前提下,将“双向单程伪距测量技术”应用到超声波测距
系统中,利用双向单程测量替代了传统的反射式双程测距,通过无线串口通信进行测距主端与测距从端的时钟同步,提高测距
量程,该技术还可消除系统自身的时钟同步误差。 同时应用“时分多路复用”技术,通过无线电信号广播进行时隙分配,使任意
时刻测距信道中只有单路处于工作状态,实现多通道近距离通道间隔下无串扰测量。 实验结果表明,双向单程测量可以将反射
测距量程提升 1 倍以上,探测精度优于 1%。 时分多路复用技术的引用,可以实现超声多通道近距离通道间隔下测量无串扰。 相似文献