Hybrid laser radar for Mars atmosphere detection

Abstract

The invention relates to a hybrid laser radar for Mars atmosphere detection. The hybrid laser radar comprises a single set of optical transceiver module for obtaining back scattering signals from Mars atmosphere molecules and dust; a coherent balance detection module which mixes the local oscillation light and the atmospheric echo signal into an intermediate frequency electric signal and converts the intermediate frequency electric signal into a high-speed analog electric signal, so a Mars atmospheric wind field is obtained through data processing; a single-photon direct detection module which is used for measuring photon electric signals of each channel to obtain photon count of each channel; and a data processing module which obtains the concentration of polarized light and Mars aerosol particles. The laser power and the echo signal stability are calibrated by using the signal-to-noise ratio of coherent detection and the photon number of direct detection, and the method is used for detecting the content of carbon dioxide gas. The hybrid laser radar has the advantages of large dynamic range and small data processing calculation amount by using single photon direct detection, and also has the advantages of high coherent detection sensitivity and good weak signal amplification performance, and the problem of multi-atmosphere parameter detection of the Mars atmosphere detection laser radar is solved under the condition that the load weight and complexity are not increased.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a hybrid laser radar for Mars atmospheric detection. Background technique [0002] Mars exploration is the focus of solar system exploration and planetary science at home and abroad. Human Mars exploration has a history of nearly 60 years. The detection methods range from flyby to orbiting remote sensing detection, and then to unmanned lander and Mars rover detection. scientific data. In 2020, China launched the Tianwen-1 Mars probe. China plans to carry out its first Mars exploration and Mars sampling return between 2020 and 2030. Mars / Phobos sampling return and Mars manned exploration in countries around the world are also planned in the next 10-2030. Achieved within 20 years. [0003] At present, the atmosphere of Mars is less than 1% of that of the Earth, mainly composed of carbon dioxide, which circulates between the atmosphere and the polar ice caps, causi...

AI Technical Summary

Problems solved by technology

[0006] However, since Mars atmospheric exploration not only requires wind field detection, but also aerosol particle concentration, type, and distribution detection; carbon dioxide gas concentration detection, single coherent detection or direct detection cannot meet the needs of Mars atmospheric detection at the same time, and due to the load weight It is difficult to carry multiple sets of atmospheric lidar systems, which limits the development of Mars atmospheric detection

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