Fig.1

Coherent lidar system"

Fig.2

Structural diagram of rotary motor"

Fig.3

Material object of rotary motor"

Fig.4

Structural diagram of rotating motor speed measurement experiment"

Fig.5

Time domain diagram of radar received echo signal at 500 r/min"

Fig.6

Time domain diagram of blade reflected echo signal at 500 r/min"

Fig.7

Errors between peak frequencies corresponding to different L and theoretical values"

Fig.8

Errors between peak frequencies corresponding to different α and theoretical values"

Table 1

Comparison of experimental results of peak frequency estimation with four algorithms"

Fig.9

1.55 μm coherent lidar developed by research group"

Fig.10

Schematic diagram of lidar placement position"

Table 2

Scanning parameter setting of coherent lidar"

Fig.11

Diamond-DA42 small aircraft"

Table 3

Main parameters of Diamond-DA42 small aircraft"

Fig.12

Schematic diagram of flight and landing routes for small aircraft"

Fig.13

The 1st group of experiments based on warning algorithm in part of the wind shear area of the wind field scan map"

Fig.14

The 2nd group of experiments based on warning algorithm in part of the wind shear area of the wind field scan map"

Fig.15

The 3rd group of experiments based on warning algorithm in part of the wind shear area of the wind field scan map"

Table 4

Alarm statistics of four algorithms in three groups of experiments"