Laser radar calibration system and method

Abstract

The invention discloses a laser radar calibration system. The calibration system comprises a laser radar, a calibration cavity, a heating cavity and at least two temperature sensors; the heater is located inside the calibration cavity; the laser radar is located outside the calibration cavity and is used for emitting laser pulses to the calibration cavity; the laser pulses can pass through the calibration cavity so as to be transmitted outside; the temperature sensors are disposed inside and outside the calibration cavity and are used for collecting the temperature of the laser pulses along the transmission path of the laser pulses; and the laser radar is also used for receiving echo signals corresponding to the laser pulses, so that the ratio of the signals of a high-quantum number channel to the signals of a low-quantum number channel can be determined according to the echo signals, and therefore, the calibration of the laser radar is realized according to the temperature and the ratio of the signals of the high-quantum number channel to the signals of the low-quantum number channel. According to the laser radar calibration system of the invention, temperature difference can be generated artificially through the heater, and therefore, a large temperature gradient can be obtained; and calibration is performed along a horizontal direction, positional deviation will not be generated, and therefore, the accuracy of a calibration result can be further improved. The present invention also discloses a calibration method.

Description

technical field [0001] The present application relates to the field of calibration, and in particular to a laser radar calibration system and method. Background technique [0002] Climate predictions are often based on temperature profiles. A temperature profile is the curve of the distribution of temperature with altitude in the atmosphere. Generally, the temperature profile can be obtained by detecting the atmospheric temperature at different heights by lidar. The laser radar emits a laser beam, and then determines the temperature of the corresponding position according to the returned echo scattering signal, and then determines the temperature profile. In order to obtain a more accurate temperature profile, it is necessary to calibrate the lidar that measures the temperature first. [0003] At present, the calibration of lidar is realized by meteorological gradient tower method or radiosonde method. Temperature sensors are deployed on the meteorological gradient tower ...

AI Technical Summary

Problems solved by technology

[0004] However, the detection height of the meteorological gradient tower method is limited by the height of the tower, and the detection height range usually does not exceed 100 meters. In the atmosphere, the temperature gradient corresponding to this height range is small, which affects the accuracy of the lidar calibration results.

The radiosonde method has a large detection height and can obtain a large temperature gradient, but the radiosonde will gradually shift during the ascent process, resulting in a certain error between the detection data and the real position profile

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