GPS高动态接收机跟踪算法研究

发布时间：2018-01-02 10:06

本文关键词：GPS高动态接收机跟踪算法研究　出处：《华东交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：全球定位导航系统由于很少受时空限制，其在各领域被广泛使用。特别在军事领域，相关产品越来越注重快速、高精度的特点，对高动态GPS接收机技术提出了更高的要求。由于在高动态环境下，载体接收机接收到的信号具有较大的多普勒或多普勒变化率，这为实现对信号的跟踪带来了巨大的挑战。而伪码环中的多普勒偏移量可以利用载波环进行补偿而消除掉，所以本文着重设计高动态场景下的载波跟踪算法，本文主要研究工作如下：首先文中在分析了锁相环基本原理的基础上，研究了不同阶数载波跟踪环对动态信号的跟踪效果，并进行了仿真分析。其次，文中根据锁相环和锁频环环路误差与环路参数的相互关系，，推导了环路最佳带宽，并在此基础上提出了基于查找表的载波环路增益控制算法。通过仿真实验表明，该算法使得环路对瞬态信号的响应时间减小，对动态的承受能力加强。其次，重点在研究分析得出锁相环相比较锁频环，具有更高精度但动态承受能力弱的特点基础上，提出了基于加权算法的载波跟踪组合环路控制策略算法，该算法通过对动态大小的检测，利用加权算法对锁相环和锁频环组合成新的复合环路。仿真结果表明：接收机能在最大加速度150g，加加速度50g/s的动态指标下正常工作。其次，文中为了充分利用锁相环精度高和锁频环动态适应性好的特点，提出了基于环路切换策略的高动态载波跟踪算法，该算法在传统的环路中添加了环路切换策略，使得环路切换更具有平稳性。仿真结果说明：载体在信号强度为45dB-Hz，以5g和10g加速度分时间段做匀加速运动的场景下，基于环路切换策略的高动态载波跟踪算法使得环路的切换次数和抖动现象明显减少，切换次数相比传统环路减少了82%。最后文中针对现代化L2C信号跟踪算法进行了研究，仿真分析表明：相比较单跟踪CM或CL信号，L2C融合跟踪算法拥有更小的环路测量误差和更佳的跟踪性能。
[Abstract]:The global positioning system with little by time and space, it is widely used in various fields. Especially in the military field, more and more attention to the related products fast, high precision, put forward higher requirements for high dynamic GPS receiver technology. Due to the high dynamic environment, the received signal carrier receiver with Doppler or Doppler changing rate, which brings a great challenge for the realization of the signal tracking. Doppler offset ring in pseudo code can be used to compensate and eliminate the carrier loop, so this paper focuses on the design of carrier tracking under high dynamic scene algorithm, the main research work are as follows:
First, based on the analysis of the basic principle of PLL, the tracking effect of different order carrier tracking loop on dynamic signal is studied, and simulation analysis is carried out.
Secondly, according to the relationship between the PLL and FLL and PLL loop error parameters, deduces the best loop bandwidth is proposed based on carrier loop gain control algorithm based on look-up table. The simulation results show that the algorithm makes the loop response time of transient signal decreases, strengthen the dynamic bearing ability.
Secondly, the phase locked loop frequency locked loop comparative analysis with emphasis on research, with higher accuracy but the dynamic characteristics of foundation bearing capacity is weak, we propose a tracking algorithm of carrier loop control algorithm based on the weighted algorithm, through the detection of dynamic size, using the weighted algorithm of PLL and FLL compound a new loop. The simulation results show that the receiver can work normally in the maximum acceleration of 150g, dynamic index jerk 50g/s.
Secondly, in this paper, in order to make full use of PLL frequency locked loop high precision and better dynamic adaptability characteristics, put forward the high dynamic carrier tracking algorithm based on loop switching strategy, the algorithm adds loop switching strategy in the traditional loop, the loop switch is more stable. The simulation results showed that the intensity of the signal as carrier in 45dB-Hz 5g and 10g, to the time period of acceleration of uniformly accelerated motion in the scene, high dynamic carrier tracking loop switching strategy algorithm makes the switching frequency and jitter loop decreased based on the switching times compared with the traditional loop is reduced by 82%.
Finally, the modern L2C signal tracking algorithm is studied. Simulation analysis shows that compared with single tracking CM or CL signal, L2C fusion tracking algorithm has smaller loop measurement error and better tracking performance.

【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P228.4

【参考文献】