Long-range coherent lidar based on pulse-compression

2021 ◽  
Author(s):  
Jing Yang ◽  
Bin Zhao ◽  
Bo Liu
Keyword(s):  
Long Range ◽  
Pulse Compression ◽  
Coherent Lidar

Long-range wind monitoring in real time with optimized coherent lidar

2016 ◽  
Vol 56 (3) ◽  
pp. 031217 ◽  
Author(s):  
Agnes Dolfi-Bouteyre ◽  
Guillaume Canat ◽  
Laurent Lombard ◽  
Matthieu Valla ◽  
Anne Durécu ◽  
...  
Keyword(s):  
Real Time ◽  
Long Range ◽  
Coherent Lidar

scholarly journals Distance and Velocity Measurement of Coherent Lidar Based on Chirp Pulse Compression

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2313 ◽  
Author(s):  
Jing Yang ◽  
Bin Zhao ◽  
Bo Liu
Keyword(s):  
High Resolution ◽  
Pulse Repetition Rate ◽  
Pulse Compression ◽  
Accurate Information ◽  
Chirp Pulse ◽  
Lidar System ◽  
Long Distance ◽  
Electro Optic ◽  
Electro Optic Modulator ◽  
Coherent Lidar

To explore lidar, which can simultaneously measure the distance and velocity of long-distance targets at high resolution, a coherent lidar system based on chirp pulse compression has been studied. Instead of a conventional acousto-optic modulator (AOM), we used an electro-optic modulator (EOM) to modulate a continuous 1550 nm laser. Using EOM, the resolution of the lidar is higher and the system simpler. The electrical waveform used to modulate the laser is a chirp pulse, which has a sweeping bandwidth of 98 MHz, a duration of 10 µs, and a pulse repetition rate of 20 kHz. The result of 100 measurements shows that the system may yield accurate information in range, ±22 cm, and radial velocity, ±1.066 cm/s.

High S/N Ratio Guided Wave Inspection of Pipe Using Chirp Pulse Compression

2004 ◽  
Author(s):  
Kiyokazu Toiyama ◽  
Takahiro Tsutsumoto ◽  
Takashi Ikeda ◽  
Takahiro Hayashi
Keyword(s):  
Long Range ◽  
Pulse Compression ◽  
Signal To Noise Ratio ◽  
Effective Means ◽  
Side Lobe ◽  
Guided Wave ◽  
Pulse Excitation ◽  
Chirp Pulse ◽  
Compression Technique ◽  
Heat Insulator

Guided wave is expected as the most promising technique for rapid long-range inspection of pipes. However, signal to noise ratio is still required to be improved, especially in highly attenuative pipes covered with heat insulator and/or buried in the ground. Recently, pulse compression technique has been developed as an effective means for improving S/N ratio in the field of radar detection. In this paper, chirp pulse compression technique was applied to the long-range inspection of pipe using guided wave. The technical brief explanation about chirp pulse compression was described. Example data signals of burst wave excitation way and chirp pulse excitation way with commonly -used amplifier were reviewed with respect to unwanted side lobe. The cause of a side lobe was investigated, and the amplifier with excellent distortion property was presented to improve S/N ratio of system with quite vanishing of side lobe.

Long range 3D active imagery with a scanned single element 1.5 μm coherent lidar system

2005 ◽  
Author(s):  
Guy N. Pearson ◽  
Kevin D. Ridley ◽  
David V. Willetts
Keyword(s):  
Long Range ◽  
Single Element ◽  
Lidar System ◽  
Coherent Lidar
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