Identifying nonstationary jamming signal via Lagrangian Coherent Structures

Hong Guang Ma, Qin Bo Jiang, Xiang Yu Kong, Zhi Qiang Liu, Zhi Yuan Ma

科研成果: 期刊稿件文章同行评审

摘要

The anti-jamming scheme is an important issue in the modern communication system, where the spread-spectrum signals are usually adopted. In a complex electromagnetic environment where the jamming sources may be close to the communication devices, a large jamming-to-signal ratio is possible. How to achieve the desired accuracy for the communication system in the presence of strong jamming is a crucial and outstanding problem. To solve this problem, we propose a method to identify the desired signal and the nonstationary jamming signal via Lagrangian Coherent Structures (LCS), and a new algorithm for calculating the maximum Finite-Time Lyapunov Exponent (FTLE) is presented. As opposed to the current approach which requires a vector field in the state space at each instant time, the proposed algorithm is performed on the vector fields which are respectively built on the desired signal and the nonstationary jamming signal via Hilbert Transform. A simulation test is conducted on a binary offset carrier (BOC) modulated signal and a chirp signal. The results indicate that the proposed method can provide new features to efficiently identify the nonstationary jamming signal.

源语言英语
文章编号1250050
期刊International Journal of Bifurcation and Chaos
22
3
DOI
出版状态已出版 - 3月 2012
已对外发布

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