Radar system

Abstract

The invention relates to the field of optical systems, and particularly discloses a radar system which is characterized in that a transmitting assembly transmits a path of signal light and a path of local oscillation light, the signal light enters a light guide assembly, the local oscillation light enters a receiving assembly, and the light guide assembly divides one path of the signal light into the receiving assembly and divides the other path of the signal light to be transmitted to the outside. And the light reflected by the outside is guided to enter the receiving assembly. The receiving assembly divides light returned from the outside into first polarization component light and second polarization component light, the first polarization component light and the second polarization component light are mixed with the local oscillation light to obtain a first measurement result and a second measurement result, and the signal light is divided into the first polarization component light and the second polarization component light to obtain a third measurement result and a fourth measurement result correspondingly. And a processing device obtains wind field information of the external atmosphere and obtains depolarization ratio information of the external atmosphere according to the measurement result. According to the invention, atmospheric wind field information and atmospheric depolarization ratio information can be detected at the same time, and the measurement accuracy can be improved.

Description

technical field [0001] The invention relates to the field of optical systems, in particular to a radar system. Background technique [0002] The consumption of fossil fuels and various human activities have had a profound impact on climate change. The feature extraction of aerosol particles and the precise observation of wind field information through remote sensing detection are of great significance for monitoring the transmission of pollutants and dust. . [0003] In the prior art, the depolarization ratio information is measured by coherent polarization lidar, and the measured depolarization ratio information can be used to distinguish aerosol particles as spherical or non-spherical particles, thereby identifying the type of aerosol in the atmosphere or the shape of the cloud. phase state. Coherent Doppler lidar is one of the effective remote sensing methods for wind field detection at present. The Doppler effect can be used to accurately invert the wind speed and dire...

AI Technical Summary

Problems solved by technology

However, this method of coherent frequency mixing must ensure that the polarization state of the signal light is consistent with that of the local oscillator light. Due to the depolarization effect of the aerosol, the polarization state of part of the echo signal light is not the same as that of the local oscillator light. This part The light cannot be measured by traditional coherent Doppler lidar, so it is impossible to obtain the depolarization ratio information of atmospheric aerosols

Therefore, traditional radars cannot simultaneously detect aerosol depolarization ratio information and atmospheric wind field distribution

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