Airborne wind speed measuring laser radar system

Abstract

The invention relates to an airborne wind speed measuring laser radar system comprising a narrow-linewidth laser pulse light source module, a radar transceiver optical antenna module and a signal receiving processing module. The narrow-linewidth laser pulse light source module consists of a narrow-linewidth seed light source, an optical fiber preamplifier, an acousto-optic modulator, a C-band boosting semiconductor optical amplifier, and a main fiber amplifier. The radar transceiver optical antenna module connected to the narrow-linewidth laser pulse light source module includes an optic fibercirculator, an optical switch, and an optical antenna. The signal receiving processing module connected with the narrow-linewidth laser pulse light source module and the radar transceiver optical antenna module includes an adjustable fiber attenuator, a fiber combiner, a balanced photodetector, a signal processing circuit and an embedded computer. The system based on the reasonable structural design can be used stably and reliably; the real-time wind speed data can be provided for the airborne atmospheric data computer; the performance of the aircraft is improved; and the flight safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of laser radar detection, and in particular relates to an airborne wind speed measurement laser radar system. Background technique [0002] If an aircraft encounters a strong airflow during flight, it will pose a great threat to flight safety. Forward atmospheric turbulence and transverse shear wind are one of the main causes of flight accidents. Therefore, the real-time measurement of the atmospheric wind field and airflow changes during the flight of the aircraft is an important task requirement during the flight. [0003] The equipment installed on the aircraft to measure wind speed can be divided into two methods: fixed-point measurement and telemetry. Among the devices for measuring wind speed at fixed points, the traditional on-board wind speed measuring device is the pitot tube. For the flight environment with low air density and low dynamics in the stratosphere, the pressure change caused by the dyn...

AI Technical Summary

Problems solved by technology

Among the devices for measuring wind speed at fixed points, the traditional on-board wind speed measuring device is the pitot tube. For the flight environment with low air density and low dynamics in the stratosphere, the pressure change caused by the dynamic pressure cannot be accurately measured.

Although the embedded air data system adopted by the new fighter can replace the traditional pitot tube, the range and accuracy of the pressure sensor cannot meet the requirements for high-altitude and low-speed aircraft

The hot-wire and hot-film anemometers mainly calculate the wind speed by detecting the heat-sensitive temperature dissipation and heat transfer rate exposed to the fluid, but these two kinds of anemometers are limited by the saturation of single-ended input signals, and the range of wind speed measurement is different. High, and temperature measurement requires a certain response time

Although the micro-pressure sensor has the advantages of high sensitivity, light weight, and corrosion resistance, the material itself has temperature drift problems, and it needs to be corrected during continuous operation, and the speed measurement accuracy is not high

Based on the Doppler effect of relative motion, the ultrasonic velocimeter measures the propagation time of ultrasonic waves in a certain direction, and can obtain the propagation speed of downwind or headwind, with high accuracy, but because the sound wave sending and receiving devices have a blocking effect on the wind in the atmosphere, Especially when the wind and sound waves are sent and received in the same direction, it is easy to cause large errors, and the structure is complicated, which is not easy to realize on the floating platform

The common disadvantage of fixed-point wind speed measurement equipment is that the airflow is easily affected by the shape of the aircraft and changes, so it needs to be calibrated according to the specific shape of the aircraft and the installation location of the equipment.

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