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Study on chaotic oscillator‐based algorithm for weak GLONASS signal acquisition
Author(s) -
Liu Yu,
Zou Xing,
Niu Xiaowei,
Hu Zhengquan
Publication year - 2020
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2901
Subject(s) - glonass , duffing equation , chaotic , algorithm , lyapunov exponent , computer science , signal (programming language) , control theory (sociology) , mathematics , gnss applications , telecommunications , physics , global positioning system , artificial intelligence , nonlinear system , control (management) , quantum mechanics , programming language
Summary According to the characteristics of the chaotic oscillator in detecting weak signals, an algorithm based on Duffing chaotic oscillator array was proposed for acquisition of weak GLONASS signals. By means of GLONASS intermediate frequency and Duffing chaotic oscillator models, Lyapunov exponent is adopted to judge the critical condition of phase track and decide whether GLONASS signals exist or not by the change of the critical condition, and numeric iteration procedure is used to calculate the exponent. Finally, the performance of algorithm is simulated using GLONASS intermediate frequency data. The results indicate that acquisition algorithm can satisfy the need of object positioning in low signal‐to‐noise ratio environment.