Application of High-Accuracy Laser Doppler Velocimeter in Self-Contained Land Navigation System

Zhihui, 应智慧 Ying; Chunfeng, 高春峰 Gao; Qi, 王琦 Wang; Guo, 魏国 Wei; Jian, 周健 Zhou; Yuanping, 谢元平 Xie

doi:10.3788/cjl201744.1204003

Cited by 4 publications

(1 citation statement)

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“…Laser Doppler Velocimetry (LDV) is a single-point velocity measurement instrument which has highprecision and non-contact properties. It is suitable for the measurement of flow velocities within (0.1~340) m/s and widely used in fields such as deep diving exploration, military production and satellite navigation [1][2][3]. Velocity measured by LDV is related to the interference fringe spacing in the measurement volume and Doppler frequency [4] and their measurement uncertainties are also related correspondingly.…”

Section: Introductionmentioning

confidence: 99%

Study on the Uncertainty of the Doppler Frequency for the Calibration of LDV within the Speed of (0.1~340) m/s

Zhang¹,

Cui²,

XIE³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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Laser Doppler Velocimetry (LDV) is a single-point velocity measurement instrument. LDV can be precisely calibrated by the adjustable speed spinning-dics facility from NIM at speeds generally less than 40 m/s. However, due to its unique limitations, it is hard to calibrate LDV at a higher speed. To solve the problem of traceability of LDV high-speed measurement results and of the applicability of LDV low-speed calibration results under highspeed conditions, it is analyzed that the uncertainty of velocity depends on both interference fringe spacing and Doppler frequency. As fringe spacing is independent of velocity, the possible difference of uncertainty in between the high and low velocity may be only related to the uncertainty of Doppler frequency at different velocities. Doppler frequency is a result of Doppler frequency algorithm, which includes mixed-radix FFT (Fast Fourier Transform) and the phase difference correction method in this paper. Because of the nonlinearity and complexity of the algorithm, the uncertainty of Doppler frequency is suitable for being evaluated by Monte Carlo Method (MCM) propagating probability distribution. The evaluation result shows that the relative uncertainty of Doppler frequency caused by the algorithm is less than 0.05% within the range of (0.1~340) m/s. The obvious difference of uncertainty has not been found in different velocities investigated. The budget resulting from Doppler frequency uncertainty change on the velocity result is less than 0.00075%. It is concluded that the calibration result at low velocity is also reasonable to be used in the case at the high velocity measurement within the speed of (0.1~340) m/s.

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Section: Introductionmentioning

confidence: 99%

Study on the Uncertainty of the Doppler Frequency for the Calibration of LDV within the Speed of (0.1~340) m/s

Zhang¹,

Cui²,

XIE³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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无人机机载激光多普勒测速仪研究与飞行验证

Chen Lanjian,

Xi Chongbin,

Zhou Jian

et al. 2023

光学学报

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Objective Unmanned aerial vehicles (UAVs) have emerged as a versatile platform for a wide range of civil applications, and offer flexibility and convenience in performing various tasks, like mapping, investigation, and patrolling. Accurate navigation information such as velocity and position is required to ensure the flight safety of UAVs. However, the global navigation satellite system (GNSS) is easily denied in urban environments due to the occlusion of tall buildings, which results in navigation information loss. Inertial navigation systems (INSs) are also hard to be relied on for longscale autonomous navigation as its error accumulates over time. Highprecision and independent velocity measurement methods will be beneficial for the navigation of UAVs. The laser Doppler velocimeter (LDV) has been applied to the integrated navigation of land vehicles improving localization accuracy. There is a bottleneck for LDV deployment on UAVs due to the limited working distance of LDV which is typically restricted to only a few meters. However, UAVs often operate at flight heights of dozens of meters, posing a challenge for LDV integration and utilization.

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