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CLC number: TN961
On-line Access: 2015-09-06
Received: 2015-02-13
Revision Accepted: 2015-04-13
Crosschecked: 2015-07-24
Cited: 3
Clicked: 6014
A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments
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Chao Wu, Lu-ping Xu, Hua Zhang, Wen-bo Zhao. 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.
@article{title="A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments",
author="Chao Wu, Lu-ping Xu, Hua Zhang, Wen-bo Zhao",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="16",
number="9",
pages="796-804",
year="2015",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.1500058"
}
%0 Journal Article
%T A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments
%A Chao Wu
%A Lu-ping Xu
%A Hua Zhang
%A Wen-bo Zhao
%J Frontiers of Information Technology & Electronic Engineering
%V 16
%N 9
%P 796-804
%@ 2095-9184
%D 2015
%I Zhejiang University Press & Springer
%DOI 10.1631/FITEE.1500058
TY - JOUR
T1 - A block zero-padding method based on DCFT for L1 parameter estimations in weak signal and high dynamic environments
A1 - Chao Wu
A1 - Lu-ping Xu
A1 - Hua Zhang
A1 - Wen-bo Zhao
J0 - Frontiers of Information Technology & Electronic Engineering
VL - 16
IS - 9
SP - 796
EP - 804
%@ 2095-9184
Y1 - 2015
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/FITEE.1500058
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.
The topic of GPS acquisition in scenarios with fast changing Doppler shifts is important and difficult, especially when the SNR is low. The authors draw material from well-established references and try to combine these methods to get the best results.
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