Optical frequency shifted FMCW Lidar system for unambiguous measurement of distance and velocity

Na, Quanxin; Xie, Qijie; Zhang, Nan; Zhang, Lanxuan; Chen, Baisong; Tao, Peng; Zuo, Guomeng; Zhuang, Dongwei; Song, Junfeng

doi:10.1016/j.optlaseng.2023.107523

Cited by 20 publications

(9 citation statements)

References 27 publications

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“…The Q-factors of the transmitted light, Q , ex_t and reflected light, Q ex_r can be approximated as shown in Eqs. ( 6) and (7), respectively. Figure 4 shows a schematic of the FFP interferometer…”

Section: Design Of a Narrow Linewidth Hybrid Wavelength Tunable Lasermentioning

confidence: 99%

“…Fields such as digital coherent optical communication [1][2][3][4][5] and light detection and ranging (LiDAR) [6][7][8][9][10][11] have recently developed owing to an increase in the amount of information and the trend toward the automated driving of automobiles. These fields have increased the demand for semiconductor lasers that are characterized by low power consumption, low cost, and small size.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the coupling efficiency under self-injection locking in a narrow linewidth hybrid wavelength tunable laser diode

Yabuki,

Kita

2024

Jpn. J. Appl. Phys.

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Section: Design Of a Narrow Linewidth Hybrid Wavelength Tunable Lasermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of the coupling efficiency under self-injection locking in a narrow linewidth hybrid wavelength tunable laser diode

Yabuki,

Kita

2024

Jpn. J. Appl. Phys.

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“…With the continuous improvement of intelligent requirements in the industrial field, sensor detection technology is an important way to collect information and an important basic condition to realize intelligence. As a kind of radar sensing technology, frequency modulated continuous wave (FMCW) radar has been widely used due to its advantages of low cost, high resolution, and adaptability to complex working environments, [1][2][3][4] including high-speed moving target recognition, life detection, automatic driving, and so on. [5][6][7][8] However, due to the noise in the environment and the influence of the system hardware itself, the signal measured by the radar sensor has large noise, which affects the final solution accuracy.…”

Section: Introductionmentioning

confidence: 99%

An improved error cancellation method for high speed FMCW radar based on FPGA platform

Han,

Yang,

Zhang

et al. 2024

Micro & Optical Tech Letters

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Target detection of frequency‐modulated continuous wave radar has the problems of high noise and low detection accuracy. The reason is due to the influence of internal hardware and external environment. In response to this issue, this article uses the field programmable gate array platform to perform frequency modulation on the radar module, time‐frequency conversion, autoregression moving average model, inverse proportion function compensation, and frequency domain selection processing on the intermediate frequency in‐phase signals collected by the oscilloscope. The algorithm proposed in this article could effectively reduce noise and system errors. Compared with traditional methods before filtering and variational mode decomposition Hilbert–Huang Transform algorithm, the effective target detection rate of this method is improved by 50%.

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“…Frequency-modulated continuous-wave laser detection and ranging (FMCW LiDAR) holds capability to accurately measure the absolute distance to diffuse reflectors at large standoff distances, owing to its technical advantages such as high precision, large dynamic range, anti-interference capability, and high signal-to-noise ratio (SNR). − This coherent detection principle is more robust to environmental variables and phase noise than other conventional LiDAR technologies, such as time-of-flight and amplitude-modulated continuous-wave LiDAR. − As such, FMCW LiDAR systems have demonstrated great potential for various applications in aerospace, autonomous driving, three-precision manufacturing, and many other fields. − …”

Section: Introductionmentioning

confidence: 99%

Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

Li,

Tian,

Lin

et al. 2024

ACS Photonics

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Frequency-modulated continuous-wave laser detection and ranging (FMCW LiDAR) is a useful technology with various applications. However, numerous existing FMCW LiDAR systems are bulky, restricting their applicability in scenarios where minimizing the form factor is essential. Another major limitation is their echo-signal sensitivity. Considering that the detected targets are typically noncooperative, efficient detection of scattered light is imperative. Based on that, a microcavity Raman laser-based FMCW LiDAR is proposed combined with laser feedback technique. In the laser feedback regime, weak echo signals from targets participate in the stimulated radiation of the laser and are enhanced spontaneously when the measurement signal resonates with the laser relaxation oscillation. Without extra optical amplifiers, the laser cavity functions as an intrinsic amplifier and provides an improved signal-to-noise ratio of over 30 dB compared with conventional frequency swept interference methods. The response optical power limit can be down to 7.92 fW in the experiment. The standard deviation in 10 measurements is about 217 μm when targeting an aluminum block. By combining the proposed system with a 2-axis galvanometer scanner, 3D imaging of actual scenes can also be effectively reconstructed. This study illustrates a microcavity Raman laser-based device for conducting FMCW ranging measurements. It employs an extremely low-power near-infrared laser for detection, effectively addressing the issue of laser active detection equipment being easily detected.

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Optical frequency shifted FMCW Lidar system for unambiguous measurement of distance and velocity

Cited by 20 publications

References 27 publications

Optimization of the coupling efficiency under self-injection locking in a narrow linewidth hybrid wavelength tunable laser diode

Optimization of the coupling efficiency under self-injection locking in a narrow linewidth hybrid wavelength tunable laser diode

An improved error cancellation method for high speed FMCW radar based on FPGA platform

Microcavity Raman Laser-Based FMCW LiDAR with Enhanced Echo Sensitivity

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