北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (4): 790-799.doi: 10.13700/j.bh.1001-5965.2016.0313

• 论文 • 上一篇    下一篇

高动态GPS信号粗捕和精捕算法仿真实现

曾婵, 李卫民, 毕波   

  1. 北京微电子技术研究所, 北京 100076
  • 收稿日期:2016-04-18 出版日期:2017-04-20 发布日期:2016-06-29
  • 通讯作者: 李卫民,E-mail:lwm2kj@qq.com E-mail:lwm2kj@qq.com
  • 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。
  • 基金资助:
    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)

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

ZENG Chan, LI Weimin, BI Bo   

  1. Beijing Microelectronics Technology Institute, Beijing 100076, China
  • Received:2016-04-18 Online:2017-04-20 Published:2016-06-29

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。

关键词: 高动态, 快速捕获, 改进的PMF+FFT, 线性调频Z变换(CZT), 多普勒模拟

Abstract: For the purpose of solving GPS signal fast acquisition problem under the high dynamic, a coarse acquisition method combining improved partial matched filter (PMF) and fast Fourier transform (FFT) was proposed. The principle and structure of PMF+FFT were analyzed, and windowing of traditional method was put forward for the problems of scalloping loss and low acquisition performance. Since the high dynamic tracking method based on extended Kalman filter has a high requirement for the precision of the parameter after acquisition, a fine acquisition based on Chirp-Z transform (CZT) algorithm was proposed on the basis of coarse acquisition. Based on the theory model of GPS signal and high dynamic trail, this paper has realized digital intermediate frequency GPS signal of high dynamic. In order to further speed up the acquisition, a fast blind search method of combining pseudo code correlation was adopted for cold start. Finally through the MATLAB simulation experiments, it is verified that the proposed coarse and fine acquisition algorithm for high dynamic GPS signal can achieve the acquisition dynamic performance of 100g and the accuracy of about 10 Hz in high dynamic environment.

Key words: high dynamic, fast acquisition, improved PMF+FFT, Chirp-Z transform (CZT), Doppler simulator

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