Aiming at the problem that traditional methods make poor detection performance when implementing detection for HF 3G-ALE signal due to low signal-to-noise ratio and carrier frequency offset, we propose a multichannel detection method for non-cooperative communication countermeasure based on Duffing chaotic oscillator. Firstly, we employ the public preamble to make sliding correlation preprocessing for the intercepted signal. Then, the correlation operational signal is put through multiple detection channels, which combine the local oscillators of different angular frequencies and chaotic oscillators with the same built-in parameters. The change of oscillator's output state in the detection channels is taken as the basis of signal detection and carrier frequency estimation. Theoretical analysis and simulation experiment show that the proposed method effectively improves the detection performance for 3G-ALE signal, and reduces complexity of the conventional chaotic detection method to a certain extent.
WU Peipei
,
ZHANG Min
,
SHI Yingchun
. A multichannel detection method for HF 3G-ALE signal based on Duffing chaotic oscillator[J]. Journal of University of Chinese Academy of Sciences, 2019
, 36(6)
: 832
-838
.
DOI: 10.7523/j.issn.2095-6134.2019.06.015
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