Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array

Jarosław Magiera

doi:10.3390/electronics10212566

Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array

Abstract

This paper presents a method for the joint detection and direction of arrival (DOA) estimation of low probability of detection (LPD) signals. The proposed approach is based on using the antenna array to receive spread-spectrum signals hidden below the noise floor. Array processing exploits the spatial correlation between phase-delayed copies of the signal and allows us to evaluate the parameter used to make the decision about the presence of LPD transmission. The DOA estimation is based on the covariance between signals received by sensors for the fixed geometry of the antenna array. Moreover, the paper provides a method for mitigating narrowband interferences prior to signal detection. The presented methods were verified through simulations which proved that the confident detection of a one-second transmission in an additive white Gaussian noise channel is possible even when the noise is 24 dB higher than the power of the received signal. The performance of DOA estimation is analyzed in a wide range of signal-to-noise and interference-to-noise ratios. It is found that the DOA may be estimated with an RMS error not exceeding 10 degrees, even if interference occupies 15% of the analyzed frequency band.

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DOI:: Digital Object Identifier (open in new tab) 10.3390/electronics10212566
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Category:: Articles
Type:: artykuły w czasopismach
Published in:: Electronics no. 10,
ISSN: 2079-9292
Language:: English
Publication year:: 2021
Bibliographic description:: Magiera J.: Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array// Electronics -Vol. 10,iss. 21 (2021), s.2566-
DOI:: Digital Object Identifier (open in new tab) 10.3390/electronics10212566
Verified by:: Gdańsk University of Technology