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high dynamic circumstance
    GPS/UWB combined postioning system is discussed as well. The major works of this thesis are as follows:The effect of the Doppler frequency precision measurement of the pseudo-code delay in high dynamic circumstance is studied. The usage of the extended-Kalman-filter (EKF) method in estimation of the carrier phase and the receiving signal frequency are being investigated.
    论文的主要工作包括下述几个方面:在研究高动态环境中多普勒频率对伪码延时测量精度的影响的基础上,使用扩展卡尔曼滤波方法进行载波相位和频率的估计,并利用载波辅助技术由载波相位的变化来校正伪码延时环,降低多普勒频移对伪码延时环的直接影响,从而得到准确的伪码延时估计,提高了伪码延时环的动态性能。
    A GPS ca rrier phase measurement scheme adapted to high dynamic circumstance is presented .
    提出了一种适合GPS系统的高动态环境载波相位测量方案 .
    In this dissertation,for the question of GPS signals acquisition and tracking under high dynamic circumstance,some problems existed in receiving GPS signals are analysed,which is brought by high dynamic circumstance. Based on the analysis,FFT code fast acquisition algorithm,integrated phaselocking and frequencylocked tracking strategy are presented. Designing methods of code circus,carrier circus structure and parameter are explained.
    针对高动态环境下GPS信号的捕获和跟踪问题,分析了高动态环境对GPS信号的影响,提出了FFT码快速捕获算法,以及二阶FLL与三阶PLL混合载波跟踪方案,并对码环和载波环的结构和参数的设计方法进行了说明。
    The simulation results and analysis show that the designing realize the signal′s fast acquisition under high dynamic circumstance and keep dynamics performance and tracking precision at the same time.
    仿真结果和分析表明该方案能在高动态环境下实现信号的快速捕获,且能较好地满足接收机动态性能和跟踪精度的要求。
    One of the difficulties of designing GPS receiver working under high dynamic circumstance is to fast acquire the satellite PN code.
    设计在高动态环境下工作的GPS接收机,其难点之一在于对卫星伪码的快速捕获。
    To design the GPS receiver working in high dynamic circumstance,the first problem to be settled is how to catch the PN code of the satellite.
    设计在高动态环境下工作的GPS接收机,其难点之一便在于对卫星伪码的快速捕获。
 

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