Abstract
In this paper, for the dust environment in complicated atmospheric on Mars, the Martian atmosphere is vertically stratified based on the vertical distribution characteristic of Martian dust particles. Combining the number concentration and particle size distribution of each layer of dust, the transmission characteristics of polarized laser in the Martian dust are studied by using the polarized Monte Carlo method. The results show that among the six selected wavelengths, the transmittance of the wavelength of 7.46 μm in Martian dust is the largest, while the laser intensity attenuation of the wavelength of 0.49 μm in Martian dust is the largest. The horizontally polarized laser of the wavelength of 0.55 μm (effective variance b = 0.1 μm) is taken as an example; the depolarization degree of the polarized laser under stratified conditions increases from the minimum value of 3.5440157e − 4 at 0 km to the maximum value of 0.0092563 at 24 km, with an increase of 0.00890189843; while the depolarization degree under nonstratified conditions increases from the minimum value of 1.2678582e − 4 at 0 km to the maximum value of 0.0045636 at 24 km, with an increase of only 0.004436842, the degree of depolarization under the condition of stratified is greater than that of nonstratified. On the whole, for different effective variance b, the variation trend of the polarization parameter with height for different polarized laser is basically identical.
Highlights
As the second-closest terrestrial planet to the Earth, Mars has always been the focus of deep-space exploration in the world
Because the concentration of Martian dust particles in the Martian atmosphere above 24 km is very small and almost negligible, this paper mainly studies that the Martian lower atmospheric communication environment under the height of 24 km has an influence on the transmission characteristics of the laser
The transmittance and depolarization degree of polarized laser under the condition of stratified when it transmitted in the Martian dust on Mars are obviously greater than those of nonstratified, which indicated that the polarization parameters calculated under the condition of stratified more accurately reflect the transmission characteristics of polarized laser in the Martian dust environment
Summary
As the second-closest terrestrial planet to the Earth, Mars has always been the focus of deep-space exploration in the world. Wu et al [1] in 2004 used the four-flux method and Monte Carlo method to study the multiple scattering and transmission attenuation characteristics of laser in a stratified dust atmosphere, which provided a theoretical basis for the numerical calculation of laser transmission in a dust environment. In 2020, Yang et al [9] used the polarized Monte Carlo method to simulate the multiple scattering of polarized laser in the Martian atmosphere, which offered theoretical support for analyzing the effect of wavelength, particle size distribution, wind speed, height, and particle number concentration on the transmission characteristics of the polarized laser. En the transmittance and depolarization degree of polarized laser transmitted in the Martian dust environment are analyzed to provide theoretical support for the realization of reliable and stable wireless optical communication on Mars in the future Based on the Martian atmospheric environment, this paper uses the polarized Monte Carlo method to stratify the atmosphere of 0–24 km on Mars and calculates the transmission characteristics of polarized laser at the vertical height. en the transmittance and depolarization degree of polarized laser transmitted in the Martian dust environment are analyzed to provide theoretical support for the realization of reliable and stable wireless optical communication on Mars in the future
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