Theoretical description of improving measurement accuracy for incoherence Mie Doppler wind lidar

Abstract

For the nonlinearity of Fabry—Perot interferometer (FPI) transmission spectrum, the measurement uncertainty of incoherent Mie Doppler wind lidar based on it increases evidently with the increase of backscattering signal Doppler shift. A method of repeating the use of the approximate linear part of FPI transmission spectra for reducing the high uncertainty of a big Doppler shift is proposed. One of the ways of realizing this method is discussed in detail, in which the characteristics of FPI transmission spectrum changing with thickness and incident angle are utilized simultaneously. Under different atmosphere conditions, it has been proved theoretically that the range of measurement uncertainty drops to one-sixth while its minimum has no serious change. This method can be used not only to guide the new system design, but also as a new working way for the fabricated system.

A scanning distortion correction method based on X – Y galvanometer Lidar system*

“…With the development of Lidar scanning technology and its wide use in military, [1] aerospace, [2] civil as well as other fields, [3,4] it has great practical significance to investigate the key technology of Lidar scanning system. [5] Lidar is a laser beam as a new detection signal active modern optical remote sensing system, [6] compared with the traditional radar operating frequency band, optical band of shorter wavelengths, which can greatly improve the radar distance resolution, angular resolution, velocity resolution, [7] and thanks to the laser's high directionality, high monochromatic, and high coherence, have the advantage of achieving high accuracy, anti-interference ability, and small volume.…”

Ultra-low power anti-crosstalk collision avoidance light detection and ranging using chaotic pulse position modulation approach

“…Therefore, various methods inducing modulation to the emit-ting laser are being researched. [14][15][16] In 2015, our group reported a chaotic pulse position modulation (CPPM) method, originally deployed for information safety considerations in optics communication, [17] to prevent range ambiguity for conventional linear detectors. [18] In our study presented here, this favorable CPPM scheme is used for ultra-low power laser transmitter and single-photon detection system, demonstrating its capability of crosstalk resistance, which will be detailed in Section 2.…”

Correction of temperature influence on the wind retrieval from a mobile Rayleigh Doppler lidar

“…[2][3][4][5] Doppler wind lidars (DWLs) can be divided into two types: a coherent and an incoherent (or direct) method. With the coherent method, the Doppler shift is obtained by beating the narrowband Mie backscatter with a local continuous-wave laser; [6,7] with the incoherent method, the Doppler shift can be measured directly by a frequency discriminator, such as Fabry-Perot interferometer, [8][9][10][11][12][13][14][15][16] iodine absorption filter, [17] Fizzeau interferometer, [18] Mach-Zehnder interferometer, [19] and Michelson interferometer. [20] The Rayleigh Doppler Wind Lidar (RDWL) takes advantage of the temperature-dependent Rayleigh backscatter.…”