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

作     者：Chao WU Lu-ping XU Hua ZHANG Wen-bo ZHAO 

作者机构：School of Aerospace Science and Technology Xidian University 

出 版 物：《Frontiers of Information Technology & Electronic Engineering》 (信息与电子工程前沿（英文版）)

年 卷 期：2015年第16卷第9期

页      面：796-804页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0839[工学-网络空间安全] 08[工学] 070104[理学-应用数学] 0835[工学-软件工程] 081101[工学-控制理论与控制工程] 0701[理学-数学] 0811[工学-控制科学与工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Nos.61172138 and 61401340) the Natural Science Basic Research Plan in Shaanxi Province of China(No.2013JQ8040) the Research Fund for the Doctoral Program of Higher Education of China(No.20130203120004) the Open Research Fund of the Academy of Satellite Application(No.2014_CXJJ-DH_12) the Xi’an Science and Technology Plan(No.CXY1350(4)) the Fundamental Research Funds for the Central Universities(Nos.201413B,201412B,and JB141303) the Open Fund of Key Laboratory of Precision Navigation and Timing Technology,National Time Service Center,CAS(Nos.2014PNTT01,2014PNTT07,and 2014PNTT08) 

主　　题：Threshold detection Discrete chirp-Fourier transform Block zero-padding High dynamic Weak L1 signal acquisition 

摘      要：Weak L1 signal acquisition in a high dynamic environment primarily faces a challenge： the integration peak is neg- atively 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.