基于FRFT的单基地MIMO雷达稳健波束形成算法

doi:10.12305/j.issn.1001-506X.2023.01.10

Abstract

Abstract:

A new robust adaptive beamforming algorithm is proposed for orthogonal frequency division multiplexing (OFDM) signals in the form of linear frequency modulation (LFM) for the monostatic multiple input multiple output (MIMO) radar system. Firstly, the proposed algorithm uses the characteristics of the LFM signal to perform fractional Fourier transform (FRFT) on the matched filtered radar echo signals, and the peak points are obtained as the observation values of the array. Then, the covariance matrix of the received signal is constructed by using the observed values, and the covariance matrix of interference and noise data is reconstructed by the Capon spectrum estimation method. Finally, the actual steering vector is estimated by solving the optimization problem, and the optimal weight of the array is obtained. The effectiveness of the proposed algorithm is verified by computer simulation experiments.

Key words: robust beamforming, multiple input multiple output (MIMO), fractional Fourier transform (FRFT), linear frequency modulation (LFM), orthogonal frequency division multiplexing (OFDM)

CLC Number:

TN957.2

Yan LYU, Fei CAO, Jianfeng XU, Xiaowei FENG. Robust beamforming algorithm for monostatic MIMO radar based on FRFT[J]. Systems Engineering and Electronics, 2023, 45(1): 79-85.

Figures/Tables 13

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参数	数值	参数	数值
载频/GHz	2.2	带宽/MHZ	8
采样频率/MHz	10	脉宽/μm	10
脉冲重复周期/μm	200	波门宽度	200

信源	DOA	(SNR/INR)/dB	速度/(m/s)	距离/km
SOI	20°	0	34	15.60
干扰1	-30°	30	-44	15.15
干扰2	-50°	35	-16	15.98

信源	DOA/(°)	(SNR/INR)/dB	速度/(m/s)	距离/km
SOI	20	0	12	14.40
干扰1	-30	30	-34	15.02
干扰2	-50	35	35	16.36

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Robust beamforming algorithm for monostatic MIMO radar based on FRFT

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