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Dual-band pure rotational raman lidar system constant self-calibration method

A laser radar and radar system technology, applied in radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation and other directions, to achieve the effect of wide application, automatic inversion and measurement, and high inversion accuracy

Inactive Publication Date: 2015-12-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a self-calibration method of dual-band pure rotation Raman laser radar system constants, to solve the problems existing in the calibration method of the prior art

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  • Dual-band pure rotational raman lidar system constant self-calibration method

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Embodiment Construction

[0015] see figure 1 As shown, a self-calibration method of dual-band pure rotational Raman lidar system constants includes the following steps:

[0016] (1), utilize lidar emission system 1 to launch laser beam 2,3 of two bands to atmosphere, the laser beam wavelength of two bands is respectively λ 1 and lambda 2 ;

[0017] (2), utilize the lidar receiving system 5 to collect the backscattered light 4 of the atmosphere;

[0018] (3), the backscattered light collected by the laser radar receiving system 5 is divided into four-way signals 6, 7, 8, 9 through the light splitting and photoelectric system, that is, the pure rotation Raman echo signal of the laser radar at the height z, respectively recorded for P H (λ 1 ,z), P L (λ 1 ,z), P H (λ 2 , z) and P L (λ 2 , z), where H represents the pure rotational Raman signal of the lidar with high-order quantum numbers, and L represents the pure rotational Raman signal of the lidar with low-order quantum numbers;

[0019] (...

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Abstract

The invention discloses a dual-band pure rotational raman lidar system constant self-calibration method. A lidar transmitting system 1 transmits two bands of laser beams 2 and 3. Backscattered light 4 of lidar is collected via a receiving system 5 of lidar. The light-splitting and photoelectric system of lidar divides the received backscattered light into four paths of signals 6,7,8 and 9. Equation solving or fitting is performed through an equation obtained by two bands of lidar measurement signals. When the number i of the selected measurement points is greater than the number k of system constants, all the system constants of pure rotational temperature measurement lidar can be solved. According to the method, automatic calibration of the pure rotational raman lidar system constants can be realized by utilizing the lidar signals without using other measuring instruments. The method is high in inversion precision and wide in range of application so that automatic inversion and measurement of lidar atmospheric temperature can be realized.

Description

technical field [0001] The invention relates to the field of laser radar, in particular to a self-calibration method of dual-band pure rotation Raman laser radar system constants. Background technique [0002] Atmospheric temperature is an important meteorological parameter in atmospheric physics, weather forecast and atmospheric environment research. At present, the more commonly used methods are balloon sounding, satellite inversion and lidar detection. The advantages of lidar in detection accuracy, spatial resolution and time resolution make it more and more important to scientific and technical personnel. At present, the calibration scheme adopted for the atmospheric temperature lidar system constants is to regularly use radiosondes for vertical calibration. However, due to the high cost and inconvenient operation of balloon sounding, it is difficult for lidar to frequently use radiosondes for calibration correction. At the same time, the air traffic control department...

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Application Information

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IPC IPC(8): G01S7/497G01S17/95
CPCG01S7/497G01S17/95Y02A90/10
Inventor 曹开法胡顺星时东锋苑克娥黄见
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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