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高动态GPS信号粗捕和精捕算法仿真实现

曾婵 李卫民 毕波

曾婵, 李卫民, 毕波等 . 高动态GPS信号粗捕和精捕算法仿真实现[J]. 北京航空航天大学学报, 2017, 43(4): 790-799. doi: 10.13700/j.bh.1001-5965.2016.0313
引用本文: 曾婵, 李卫民, 毕波等 . 高动态GPS信号粗捕和精捕算法仿真实现[J]. 北京航空航天大学学报, 2017, 43(4): 790-799. doi: 10.13700/j.bh.1001-5965.2016.0313
ZENG Chan, LI Weimin, BI Boet al. Simulation realization of high dynamic GPS signal coarse acquisition and fine acquisition algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(4): 790-799. doi: 10.13700/j.bh.1001-5965.2016.0313(in Chinese)
Citation: ZENG Chan, LI Weimin, BI Boet al. Simulation realization of high dynamic GPS signal coarse acquisition and fine acquisition algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(4): 790-799. doi: 10.13700/j.bh.1001-5965.2016.0313(in Chinese)

高动态GPS信号粗捕和精捕算法仿真实现

doi: 10.13700/j.bh.1001-5965.2016.0313
基金项目: 

核高基重大专项 2009ZX01031-001-014

中国第二代卫星导航系统重大专项 GFZX03030204

详细信息
    作者简介:

    曾婵, 女, 硕士研究生。主要研究方向:卫星导航基带信号处理算法

    李卫民, 男, 硕士, 研究员。主要研究方向:卫星导航芯片组设计与研发

    毕波, 男, 研究员。主要研究方向:卫星导航算法研究和导航芯片的研发

    通讯作者:

    李卫民, E-mail:lwm2kj@qq.com

  • 中图分类号: V249.3;TN911.7

Simulation realization of high dynamic GPS signal coarse acquisition and fine acquisition algorithm

Funds: 

Nuclear Takamoto Major Project 2009ZX01031-001-014

Major Projects of the Second Generation Satellite Navigation System in China GFZX03030204

More Information
  • 摘要:

    为了解决高动态下对GPS信号快速捕获的问题,提出了改进的部分匹配滤波(PMF)和快速傅里叶变换(FFT)相结合的粗捕方法,对其原理和结构进行了分析,并针对其引起的扇贝损失和捕获性能不高的问题,对传统PMF+FFT方法进行加窗处理;考虑到高动态下基于扩展卡尔曼跟踪的方法对捕获后参数的精度要求很高,因此在粗捕的基础上提出了基于线性调频Z变换(CZT)算法的精捕方法,并在GPS信号理论模型和模拟高动态轨迹的基础上,实现了高动态GPS数字中频信号的生成,为进一步加快捕获速度,对于冷启动时提出了一种组合码相关的卫星快速盲搜方法;最后通过MATLAB进行系统仿真实验,验证了所提出的高动态GPS信号粗捕和精捕算法能在加速度为100g的高动态环境下有约10 Hz的捕获精度。

     

  • 图 1  单个伪码检测时开窗示意图

    Figure 1.  Windowing schematic of single pseudo code detection

    图 2  多个伪码检测时开窗示意图

    Figure 2.  Windowing schematic of multiple pseudo code detection

    图 3  改进的PMF+FFT结构示意图

    Figure 3.  Schematic of improved PMF+FFT structure

    图 4  PMF+FFT归一化幅频响应

    Figure 4.  Normalized PMF+FFT amplitude frequency response

    图 5  PMF+FFT归一化幅频响应放大图

    Figure 5.  Enlarged view of normalized PMF+FFT amplitude frequency response

    图 6  加窗后PMF归一化幅频响应

    Figure 6.  Normalized PMF amplitude frequency response after window adding

    图 7  加窗后第0点FFT归一化幅频响应

    Figure 7.  Normalized amplitude frequency response of the zero point of FFT after window adding

    图 8  加窗后FFT归一化幅频响应

    Figure 8.  Normalized FFT amplitude frequency response after window adding

    图 9  加窗后PMF+FFT归一化部分幅频响应

    Figure 9.  Normalized PMF+FFT amplitude frequency response after window adding in part

    图 10  CZT取样示意图

    Figure 10.  Schematic of CZT sampling

    图 11  高动态下接收机运动轨迹

    Figure 11.  Trajectories of receiver under high dynamic

    图 12  并行码相位捕获后的频谱

    Figure 12.  Spectrum after parallel code phase acquisition

    图 13  改进的PMF+FFT捕获多普勒频率结果

    Figure 13.  Doppler frequency result of improved PMF+FFT acquisition

    图 14  改进的PMF+FFT捕获码相位结果

    Figure 14.  Code phase result of improved PMF+FFT acquisition

    图 15  精捕CZT变换后的频谱

    Figure 15.  Spectrum after fine acquisition by CZT

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出版历程
  • 收稿日期:  2016-04-18
  • 录用日期:  2016-02-27
  • 刊出日期:  2017-04-20

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