A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments*

Wu Chao; Xu Lu-ping; Zhang Hua; Zhao Wen-bo

doi:10.1631/FITEE.1500058

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A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments*

Electrical & Electronic Engineering | Updated：2022-06-06

- A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments*
- 高动态弱信号环境下针对L1信号参数估计的基于离散chirp-Fourier变换块补零方法
- Frontiers of Information Technology & Electronic Engineering Vol. 16, Issue 9, Pages: 796-804(2015)
- Affiliations：
  
  School of Aerospace Science and Technology, Xidian University, Xi’an 710126, China
- Author bio：
  
  †E-mail:wuchaoid@126.com
- Funds：
- DOI：10.1631/FITEE.1500058
  CLC：
- Received：13 February 2015，
  
  Revised：2015-07-24，
  
  Accepted：13 April 2015，
  
  Published：2015-09
- Accepted：
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Wu Chao, Xu Lu-ping, Zhang Hua, et al. A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments*[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(9): 796-804.
DOI：

Wu Chao, Xu Lu-ping, Zhang Hua, et al. A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments*[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(9): 796-804. DOI： 10.1631/FITEE.1500058.

摘要

目的

为克服高动态弱信号环境下信号的积分峰值受比特符号翻转和频率误差的影响，提出一种基于离散chirp-Fourier变换块补零方法。

创新点

与传统闭环捕获和跟踪的接收机结构相比，该方法适用于开环捕获。该方法结合了离散chirp-Fourier变换和块补零思想，能够使后相关信号在剥离比特符号后进行相干积累并同时进行高动态参数精准预测。同时，对所提方法的检测性能进行分析推导捕获概率和虚警概率表达式。

方法

首先，后相关信号通过块补零处理被分为一些块，然后这些块通过离散chirp-Fourier变换处理。以这种方式比特翻转对积分峰值的影响可以被削弱，同时后相关信号可以进行相干积累。最后通过阈值检测积分峰值来完成高动态参数的预测，这个阈值是通过设定的虚警概率得出的。仿真结果表明当接收信号长度一定时，本文方法较BASIC方法能在更低的信噪比下检测到高动态参数。

结论

本文结合离散chirp-Fourier变换和块补零思想，在弱信号高动态环境下提出基于离散chirp-Fourier变换的块补零方法。仿真结果表明本文方法较BASIC方法在更低的信噪比下预测高动态参数。与利用传统接收机结构的闭环捕获和跟踪方法的相比，这种方法是一种开环捕获的方法，非常适合软件无线电接收机。

Abstract

Weak L1 signal acquisition in a high dynamic environment primarily faces a challenge: the integration peak is negatively influenced by the possible bit sign reversal every 20 ms and the frequency error. The block accumulating semi-coherent integration of correlations (BASIC) is a state-of-the-art method

but calculating the inter-block conjugate products restricts BASIC in a low signal-to-noise ratio (SNR) acquisition. We propose a block zero-padding method based on a discrete chirp-Fourier transform (DCFT) for parameter estimations in weak signal and high dynamic environments. Compared with the conventional receiver architecture that uses closed-loop acquisition and tracking

it is more suitable for open-loop acquisition. The proposed method combines DCFT and block zero-padding. In this way

the post-correlation signal is coherently post-integrated with the bit sequence stripped off

and the high dynamic parameters are precisely estimated using the threshold set based on a false alarm probability. In addition

the detection performance of the proposed method is analyzed. Simulation results show that compared with the BASIC method

the proposed method can precisely detect the high dynamic parameters in lower SNR when the length of the received signal is fixed.

关键词

Keywords

references

CA Aceros-Moreno , D Rodriguez . Fast discrete chirp Fourier transforms for radar signal detection systems using cluster computer implementations . 2005 . Proc. 48th Midwest Symp. on Circuits and Systems . 1047 - 1050 . DOI: 10.1109/MWSCAS.2005.1594284 http://doi.org/10.1109/MWSCAS.2005.1594284 .

D Belega , D Dallet . Frequency estimation via weighted multipoint interpolated DFT . IET Sci Meas Technol , 2008 . 2 ( 1 ): 1 - 8 . DOI: 10.1049/iet-smt:20070022 http://doi.org/10.1049/iet-smt:20070022 .

L Dai , Z Wang , J Wang , 等 . Joint code acquisition and Doppler frequency shift estimation for GPS signals . 2010 . Proc. IEEE 72nd Vehicular Technology Conf . 1 - 5 . DOI: 10.1109/VETECF.2010.5594093 http://doi.org/10.1109/VETECF.2010.5594093 .

B Fan , K Zhang , Y Qin , 等 . Discrete chirp-Fourier transform-based acquisition algorithm for weak Global Positioning System L5 signals in high dynamic environments . IET Radar Sonar Navig , 2013 . 7 ( 7 ): 736 - 746 . DOI: 10.1049/iet-rsn.2012.0249 http://doi.org/10.1049/iet-rsn.2012.0249 .

H Fu , PY Kam . MAP/ML estimation of the frequency and phase of a single sinusoid in noise . IEEE Trans Signal Process , 2007 . 55 ( 3 ): 834 - 845 . DOI: 10.1109/TSP.2006.888055 http://doi.org/10.1109/TSP.2006.888055 .

BC Geiger , C Vogel . Influence of Doppler bin width on GPS acquisition probabilities . IEEE Trans Aerosp Electron Syst , 2013 . 49 ( 4 ): 2570 - 2584 . DOI: 10.1109/TAES.2013.6621837 http://doi.org/10.1109/TAES.2013.6621837 .

BC Geiger , C Vogel , M Soudan . Comparison between ratio detection and threshold comparison for GNSS acquisition . IEEE Trans Aerosp Electron Syst , 2012 . 48 ( 2 ): 1772 - 1779 . DOI: 10.1109/TAES.2012.6178098 http://doi.org/10.1109/TAES.2012.6178098 .

P Huang , Y Pi , I Progri . GPS signal detection under multiplicative and additive noise . J Navig , 2013 . 66 ( 4 ): 479 - 500 . DOI: 10.1017/S0373463312000550 http://doi.org/10.1017/S0373463312000550 .

S Kay . A fast and accurate single frequency estimator . IEEE Trans Acoust Speech Signal Process , 1989 . 37 ( 12 ): 1987 - 1990 . DOI: 10.1109/29.45547 http://doi.org/10.1109/29.45547 .

X Li , W Guo . Efficient differential coherent accumulation algorithm for weak GPS signal bit synchronization . IEEE Commun Lett , 2013 . 17 ( 5 ): 936 - 939 . DOI: 10.1109/LCOMM.2013.031913.130267 http://doi.org/10.1109/LCOMM.2013.031913.130267 .

X Li , W Guo , X Xie . A GPS bit synchronization method for high-dynamic and weak signal . J Electron Inform Technol , 2011 . 33 ( 10 ): 2521 - 2525 . (in Chinese) DOI: 10.3724/SP.J.1146.2011.00270 http://doi.org/10.3724/SP.J.1146.2011.00270 .

SK Shanmugam , J Nielsen , G Lachapelle . Enhanced differential detection scheme for weak GPS signal acquisition . 2007 . Proc. Int. Technical Meeting of the Satellite Division of the Institute of Navigation . 1 - 14 . .

SM Spangenberg , I Scott , S McLaughlin , 等 . An FFT-based approach for fast acquisition in spread spectrum communication systems . Wirel Pers Commun , 2000 . 13 ( 1-2 ): 27 - 55 . DOI: 10.1023/A:1008848916834 http://doi.org/10.1023/A:1008848916834 .

YT Su , RC Wu . Frequency acquisition and tracking in high dynamic environments . IEEE Trans Veh Technol , 2000 . 49 ( 6 ): 2419 - 2429 . DOI: 10.1109/25.901910 http://doi.org/10.1109/25.901910 .

C Yang , S Han . Block-accumulating coherent integration over extended interval (BACIX) for weak GPS signal acquisition . 2001 . Proc. 19th Int. Technical Meeting of the Satellite Division of the Institute of Navigation . 2427 - 2440 . .

C Yang , T Nguyen , E Blasch , 等 . Post-correlation semi-coherent integration for high-dynamic and weak GPS signal acquisition . 2008 . Proc. IEEE/ION Position, Location and Navigation Symp . 1341 - 1349 . DOI: 10.1109/PLANS.2008.4570122 http://doi.org/10.1109/PLANS.2008.4570122 .

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