Microwave windfinding laser radar apparatus

Abstract

One laser radar which is used for the measuring the wind field as a pilot balloon is microwave modulating. including the system of the pulse laser and extending-string mirror; the receiving system including the telescope , optical fiber, narrow-cut filter; the frequently system is made up of the light-sensitive detector and the telescope; the data handling system is composed of the analog digital transmitting setting, the computer, the software modulation of amplitude of nanosecond pulse the laser radar, the Doppler shift of the scattering of the air molecule and the gas-solid is achieved by the microwave frequency. Compared with the measuring wind laser radar, the invention keep the good points of the directivity of the laser radar room, the high standard of the distinguishing ability .the intimation of the sending wave-length, is adapt to the different requirements of the aircraft and military. Pulse modulation improves the signal to mask radio greatly. The sending of laser radar and the frequency of technical methods own the advantage of both the laser radar and microwave radar, countering the balance of the disadvantage of the present technology, the invention means a lot to the development of laser radar and the popularization of it in our country.

Description

technical field [0001] The invention relates to a laser measuring device for atmospheric wind field, more specifically a microwave wind measuring laser radar device for measuring atmospheric wind field. Background technique [0002] Atmospheric wind field is an important parameter in meteorological observation, and has important application value in the fields of weather, climate, ocean, environment, transportation, aviation, and aerospace. At present, my country's small and medium-scale disastrous weather observation and forecasting capabilities are insufficient. However, numerical weather prediction urgently needs high-precision three-dimensional wind field data as initial calculation parameters. [0003] Wind lidar (Doppler lidar) for wind field measurement is an atmospheric remote sensing technology developed in the 1970s. Currently, existing technologies include coherent wind lidar and incoherent wind lidar. NASA developed a coherent wind lidar in the 1980s to measure...

AI Technical Summary

Problems solved by technology

[0005] In addition, the detection sensitivity of incoherent wind lidar, which can detect the scattering of atmospheric molecules, is only 2 / 1000 to 3 / 1000, so it becomes very difficult to extract the Doppler frequency shift from the weak atmospheric backscattering signal

[0006] In short, the current wind lidar system, whether it is a coherent or incoherent system, has obvious shortcomings in the scattered particles that can be measured and the measurement sensitivity, and the structure is complex and expensive, so it is difficult to be extended to practical applications

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