Dual-mode laser pulse emission control and echo signal processing system

Abstract

The invention discloses a dual mode laser pulse emission control and echo signal processing system, and aims to provide a processing system which can ensure a maximum detection range of a pulsed fiber wind lidar while minimizing a close-range detection blind region. The invention is implemented by the following technical scheme: an acoustic optical modulator receives a command of a center control computer through parallel connection with an information processing module, and a modulation signal is sent to the acoustic optical modulator, the acoustic optical modulator outputs seed laser pulses corresponding to modulation signal parameters, an optical antenna transmits and receives dual mode laser pulses and echo signals thereof which are injected into a photodetector and converted into photoelectric signals, the photoelectric signals are transmitted to the information processing module, range gate spectral data processing results are transmitted to the center control computer to complete dual mode range gate spectral data combination, laser pulses of two parameter modes are outputted alternately, laser echo signals in different parameter modes are processed, the maximum detection range of a lidar is detected and a close-range detection blind region is detected using high repetition frequency and short pulse width.

Description

technical field [0001] The invention belongs to the field of signal control and processing, and more specifically, the invention relates to a system for controlling laser output parameters and processing echo signals of a pulse fiber laser wind measuring radar. Background technique [0002] With the development of laser technology, lidar detection is no longer limited to the field of hard target ranging, and has begun to expand to the direction of gas concentration, cloud thickness, sol concentration, etc. more and more. The pulsed fiber optic laser wind radar uses the Doppler frequency shift of the laser scattering echo by tiny particles drifting with the wind in the atmosphere to measure the atmospheric wind field. Its maximum detection distance depends on the energy of the emitted laser. Under certain circumstances, the laser energy is closely related to the laser pulse width. The longer the pulse width, the greater the energy, and the farther the maximum detection dista...

AI Technical Summary

Problems solved by technology

In order to reduce the blind area, the existing pulse fiber laser wind measurement radar usually uses short pulse width to transmit laser pulses. Because the laser energy is relatively low, the maximum detection distance is usually short; while the long pulse width pulse laser measurement Wind radar has a large detection blind zone and cannot perform close-range wind field measurement

To sum up, the current pulsed fiber optic laser wind radar does not have an effective technical means to take into account the detection distance of far and near wind fields

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