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Robust acquisition based on linear frequency modulation signal for extremely high-mobility satellite communication
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DOI：10.23919/jcc.fa.2025-0355.202604.png)
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Abstract
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In extremely high-mobility scenarios, the severe wideband Doppler effect significantly deteriorates the performance of traditional acquisition methods and increases computational complexity. Using the generalized wideband ambiguity function (GWAF), this paper derives the analytical and approximate closedform expressions of the GWAF for the linear frequency modulated (LFM) signal and further clarifies the mechanism of correlation acquisition performance degradation for LFM signals under extremely high-mobility conditions. To overcome the limitation of performance degradation, an optimization method for the superposed LFM signal, based on its GWAF, using an alternating iterative genetic algorithm (GA) is proposed to improve the time-domain correlation performance of the superposed LFM signal, satisfying the requirements for time-domain correlation acquisition in low SNR and extreme high mobility scenarios. Based on the optimized signal, a low-complexity iterative superposition matched filtering (ISMF) acquisition method is designed for extremely high-mobility signals. Simulation results demonstrate the validity of the theoretical expressions of the GWAF and the proposed ISMF acquisition method based on optimized waveforms, achieving performance comparable to traditional methods while significantly reducing computational complexity.
Keywords:
acquisition
ambiguity function
extremely high-mobility communication
LFM signal
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