Authors: Ruey-Bing (Raybeam) Hwang, Yi-Che Tsai, Chun-Fan Chien, Fang-Yao Kuo, Hsien-Tung Huang, Wei-Hsiung Chen, Cherng-Chyi Hsiao, Chin-Cheng Chuang, Ke-Wen Lin, Yuan-Hao Sun
Source: FERMAT, Volume 5, Article 4, Sep-Oct., 2014
Abstract: We describe an X-band marine phased-array frequency-modulated continuous-wave (FMCW) radar system based on the smart antenna technology. Two main features, including the beam-forming and angles-of-arrival (AOA) estimation, are presented in this paper. Such a system is composed of eight subarray antennas arranged linearly, each of which consists of ten 1-D patch array antennas generating a directional pattern along the vertical plane. The hybrid analog-digital beam-forming scheme was implemented; specifically, the phased local oscillator was developed for manipulating the phase angle over the local oscillator rather than over the output X-band signal for transmission. Alternatively, by dynamically adjusting the amplitude and phase of the FMCW signals generated by direct digital synthesis (DDS) device, we can also achieve the function of beamforming. Additionally, the angles-of-arrival of the correlated echo signal scattering by targets are estimated by using the subspace method – space smooth multiple signal classification (MUSIC) algorithm. The AOA estimator, which includes the hardware for down-converting the X-band signals to I/Q baseband and the software for algorithm implementation, has been deployed. The measurements for range detection, angles of arrival estimation, and beam-forming has been carried out in this research work.
Index Terms: FMCW, smart antenna system, phased-array system, angle-of-arrival estimation, beam-forming technique.
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