Intelligent and compact coherent Doppler lidar with fiber-based configuration for robust wind sensing in various atmospheric and environmental conditions

Kotake, N.; Sakamaki, Hiroshi; Imaki, Masaharu; Miwa, Yoshichika; Ando, Toshiyuki; Yabugaki, Yoshiyuki; Enjo, Masayuki; Kameyama, Shumpei

doi:10.1364/oe.455755

Cited by 13 publications

(9 citation statements)

References 22 publications

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“…However, if the pulse accumulation number is too small, the signal is seriously disturbed by noise. [32] Therefore, it is necessary to balance the pulse accumulation number with the influence of the noise. In order to achieve this balance, the minimum pulse accumulation number is set as the basic processing unit.…”

Section: Resultsmentioning

confidence: 99%

Decoupling of temporal/spatial broadening effects in Doppler wind LiDAR by 2D spectral analysis

Liu 刘,

Zhang 张,

Zhu 竹

et al. 2024

Chinese Phys. B

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Pulse echo accumulation is commonly employed in coherent Doppler wind LiDAR under the assumption of steady wind. Here, the measured spectral data is analyzed in the time and frequency dimensions to cope with the temporal wind shear and achieve the optimal accumulation time. A hardware-efficient algorithm combining the interpolation and cross-correlation is used to enhance the wind retrieval accuracy by reducing the frequency sampling interval and then reduce the spectral width calculation error. Moreover, the temporal and spatial broadening effects are decoupled according to the strategy we developed.

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Section: Resultsmentioning

confidence: 99%

Decoupling of temporal/spatial broadening effects in Doppler wind LiDAR by 2D spectral analysis

Liu 刘,

Zhang 张,

Zhu 竹

et al. 2024

Chinese Phys. B

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“…spectral domain signal-to-noise ratio, Fig. 3) 14) is improved through this process. The gate time width [T G (s)] should be shorter than or equal to a coherence time of the detected signal [T C (s)].…”

Section: Introductionmentioning

confidence: 99%

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Kameyama

2024

Jpn. J. Appl. Phys.

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Single-particle detection with a continuous-waves coherent Doppler lidar (CW-CDL) is an interesting event. Even though some experimental results have been shown in past literatures as evidence of single-particle detection, these results have not been verified from theoretical point of view. Here, performance of a CW-CDL with the single-particle detection is investigated. Examples of single-particle detection which have been reported in the past literatures are verified by using theoretical simulation. Further, comparison on signal detection ability between single- and multiple- particle cases is additionally performed theoretically.

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“…There have been some studies on improving detection distance [36][37][38]. However, the signals of lidars are attenuated rapidly under rainfall conditions [39], limiting their ability to detect windshear on rainy days. In addition, raindrops bring spectrum distortion in the Doppler wind lidar, which has a significant impact on the inversion of true wind speed in rain [3,40].…”

Section: Introductionmentioning

confidence: 99%

Windshear Detection in Rain Using a 30 km Radius Coherent Doppler Wind Lidar at Mega Airport in Plateau

Xia,

Chen,

Yuan

et al. 2024

Remote Sensing

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Convective weather is often accompanied by precipitation and windshear, seriously endangering the safety of aircraft during takeoff and landing. However, under rainfall conditions, conventional wind lidars have a limited detection range due to significant signal attenuation. To solve this problem, a 200 mm temperature-controlled telescope coated with a hydrophobic film is applied in the coherent Doppler wind lidar system to improve the detection capability in rain. The maximum detection range of the lidar is extended to 30 km and demonstrated at Kunming Changshui International Airport at an altitude of 2102 m. Firstly, the detection accuracy and maximum detection range of the lidar are verified. Through the analysis of the horizontal wind field under two typical convective weather conditions, it is found that convective weather often accompanies low-level convergence and divergence structures, leading to headwind shear and crosswind shear on the airport runway. From the vertical profile, it is shown that the triggering of convective weather is accompanied by low-level southwest winds and high-altitude northeastern winds. According to the statistics of wind speed and direction on clear and rainy days over 9 months, rainy days are usually caused by the invasion of cold air from Northeast China, resulting in airport windshear. In summary, the enhanced lidar can effectively identify and analyze windshear during rainy days, which is very useful for aviation safety, especially for takeoff and landing in all weather conditions.

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Intelligent and compact coherent Doppler lidar with fiber-based configuration for robust wind sensing in various atmospheric and environmental conditions

Cited by 13 publications

References 22 publications

Decoupling of temporal/spatial broadening effects in Doppler wind LiDAR by 2D spectral analysis

Decoupling of temporal/spatial broadening effects in Doppler wind LiDAR by 2D spectral analysis

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Windshear Detection in Rain Using a 30 km Radius Coherent Doppler Wind Lidar at Mega Airport in Plateau

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