...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerospace science and technology >A new FFT acquisition scheme based on partial matched filter in GNSS receivers for harsh environments
【24h】

A new FFT acquisition scheme based on partial matched filter in GNSS receivers for harsh environments

机译：GNSS接收机中基于局部匹配滤波器的新FFT采集方案，用于恶劣环境

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

FFT acquisition scheme based on partial matched filter is an important search method in GNSS receivers, which can scan the code phase and Doppler frequency by parallel search scheme. However, the detection probability reduces due to the coherent combing loss and scalloping loss. To solve this problem, we propose a new FFT acquisition method based on Partial Matched Filter (PMF-FFT) in GNSS receiver, in which, the IF signal is divided and central frequency is shifted before the matched filters, and the FFT results are combined to search the Doppler frequency. The performance of the scheme is analyzed by amplitude response of the system. Both analysis and simulation results show that the new scheme has a larger acquisition range without adding the FFT points, which is quite appropriate for dynamic and weak signal environments. We also do a comparison based on the collected data test, showing that the PMF-FFT scheme outperforms the other three methods generally used in the GNSS receivers. Moreover, we apply an FPGA&DSP hardware receiver to verify the practicability and superiority of our method, which turns out our method can extremely reduce the acquisition time in a cold start condition, compared to the serial scheme. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：基于部分匹配滤波器的FFT采集方案是GNSS接收机中一种重要的搜索方法，可以通过并行搜索方案扫描码相位和多普勒频率。但是，由于相干的梳理损耗和扇贝形损耗，检测概率降低。为了解决这个问题，我们提出了一种新的基于部分匹配滤波器（PMF-FFT）的GNSS接收器FFT方法，该方法是在匹配的滤波器之前对IF信号进行分频和中心频率偏移，然后对FFT结果进行组合搜索多普勒频率。通过系统的幅度响应来分析该方案的性能。分析和仿真结果均表明，该新方案在不增加FFT点的情况下具有较大的采集范围，非常适合于动态和弱信号环境。我们还根据收集的数据测试进行了比较，结果表明PMF-FFT方案优于GNSS接收机中通常使用的其他三种方法。此外，我们使用FPGA＆DSP硬件接收器来验证本方法的实用性和优越性，结果表明，与串行方案相比，该方法在冷启动条件下可以极大地减少采集时间。 （C）2016 Elsevier Masson SAS。版权所有。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号