Frequency-Modulated Continuous-Wave Coherent Lidar With Downlink Communications Capability

Xu, Zhongyang; Chen, Kai; Sun, Xiuyuan; Zhang, Kelin; Wang, Yicheng; Pan, Shilong

doi:10.1109/lpt.2020.2990942

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…The frequency shift keying (FSK) [5] or the phase shift keying (PSK) continuous wave radar achieves range-velocity estimation of multi-targets simultaneously, but the estimation is not accurate when the targets are relatively stationary. Frequency Modulated Continuous Wave (FMCW) radar [6,7], which utilizes frequency modulation such as triangle wave and sawtooth wave, can provide range and velocity estimates of multiple targets simultaneously.…”

Section: Introductionmentioning

confidence: 99%

2D-Unitary ESPRIT Based Multi-Target Joint Range and Velocity Estimation Algorithm for FMCW Radar

Wen,

Yi,

Zhang

et al. 2023

Applied Sciences

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Millimeter-wave FMCW radar has been widely used in joint range-velocity estimation of multiple targets. However, most existing algorithms are unable to estimate the range-velocity information with high accuracy simultaneously and fail to discriminate the targets with either closely spaced ranges or closely spaced velocities in the 2D range-Doppler spectrum. In order to deal with these problems, this paper proposes a 2D-Unitary ESPRIT-based joint range and velocity estimation algorithm of multiple targets for FMCW radar. Firstly, The 1D-IF signal is constructed into a 2D virtual array signal, the virtual array signals are preprocessed by a 2D-spatial smoothing technique to generate a new matrix signal. Then, according to the 2D-Unitary ESPRIT algorithm, the 2D real-valued information of the target parameters is obtained from this matrix signal, and then a new complex-value matrix is constructed. Finally, the eigenvalue decomposition of this new complex-value matrix is performed, and the range-velocity estimates of multiple targets are, respectively, calculated from the real and imaginary parts of the eigenvalues, and paired automatically. The simulation results illustrate that the proposed algorithm not only provides highly accurate range-velocity estimates but also has high-resolution performance and achieves automatic pairing of the range-velocity estimates in multi-target scenarios, thus effectively improving the multi-target joint range and velocity estimation performance of FMCW radar.

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Section: Introductionmentioning

confidence: 99%

2D-Unitary ESPRIT Based Multi-Target Joint Range and Velocity Estimation Algorithm for FMCW Radar

Wen,

Yi,

Zhang

et al. 2023

Applied Sciences

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“…Therefore, FMCW Lidars have been widely applied in various fields such as atmospheric measurements, object tracking and location, 3D imaging, automotive collision avoidance, free-space optical downlink communications, bio-medical application, etc. [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Ranging Resolution of a FMCW Lidar

Xiao

Jiang

et al. 2021

Photonics

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In some previous reports about frequency-modulated continuous-wave (FMCW) Lidar, observing the longer waveform of a de-chirped signal is considered an effective scheme for further improving the ranging resolution. In this work, the ranging resolution of a FMCW Lidar is experimentally investigated, and the feasibility of such a scheme is tested. During the experiment, a FMCW signal is generated via a Mach–Zehnder modulator in the transmitted port. In the received port, the de-chirped signal is extracted based on a homodyne detection scheme and is analyzed by an electrical spectrum analyzer. Two different methods are adopted to determine the ranging resolution. One is based on a single target, for which the ranging resolution is obtained through inspecting the shift of spectral peak position as the target moves. The other is based on two targets, for which the ranging resolution is acquired through inspecting the variation of spectrum distribution as the spacing of two targets changes. The experimental results demonstrate that extending the observed duration of the de-chirped signal cannot improve the ranging resolution, and the corresponding physical mechanism is revealed.

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