SAR-communication integration technology under the framework of unmatched filtering

doi:10.7523/j.ucas.2022.085

Abstract

Abstract: Integrated waveform design is the key to the realization of radar communication integration technology. Orthogonal frequency division multiplexing (OFDM) signal is regarded as the most potentially integrated waveform signal. However, the OFDM integrated signal has the following problems in practical application: under the framework of matched filtering, the communication signals contained in the OFDM integrated signal lead to high sidelobes and pseudo peaks in the two-dimensional fuzzy function, which affects the performance of synthetic aperture radar (SAR) imaging. OFDM integrated signal has a high peak-to average power ratio (PAPR), which can not give full play to the linear amplification performance of the power amplifier, and then affect the detection range and communication performance. Aiming at the above problems, this paper applies the CP (cyclic prefix)-based unmatched filter imaging algorithm to integrated signal processing and proposes an integrated signal design method based on discrete fourier transform (DFT) precoding to eliminate the influence of communication signals on imaging performance. The PAPR of the signal is controlled within an acceptable range to achieve good compatibility between SAR imaging and communication performance. Finally, the effectiveness of the proposed method is proved by experiments.

Key words: joint radar and communication, OFDM-based integrated signal, imaging algorithms based on unmatched filtering, distance sidelobe suppression, peak-to-average power ratio

CLC Number:

TN95

SUN Wen, SUN Jili, LU Hongliang. SAR-communication integration technology under the framework of unmatched filtering[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(3): 387-397.

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