a radar system

Abstract

The invention relates to the field of optical systems, and specifically discloses a radar system. A transmitting component sends out one signal light and one local oscillator light, so that the signal light is incident on the light guide component, and the local oscillator light is incident on the receiving component, and the light guide component transmits the signal The light is split into one path to be incident on the receiving component, and another path is split to be emitted to the outside, and the light reflected from the outside is guided to be incident on the receiving component. The receiving component divides the light returned from the outside into the first polarization component light and the second polarization component light, and mixes them with the local oscillator light respectively to obtain the first measurement result and the second measurement result, and divides the signal light into the first polarization component light and the second polarization component light The two polarized light components obtain the third measurement result and the fourth measurement result correspondingly, and the processing device obtains the wind field information of the external atmosphere and the depolarization ratio information of the external atmosphere according to the measurement results. The invention can realize simultaneous detection of atmospheric wind field information and atmospheric depolarization ratio information, and can improve measurement accuracy.

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

Images