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Dual mode laser pulse emission control and echo signal processing system

A laser pulse and echo signal technology, applied in the radio wave measurement system, using re-radiation, re-radiation of electromagnetic waves, etc., can solve the problem of not taking into account the detection distance of the far and near wind field, the inability to measure the wind field at close range, and the detection of large blind spots and other problems, to achieve the effect of reducing the short-distance detection blind zone

Inactive Publication Date: 2016-08-24
SOUTH WEST INST OF TECHN PHYSICS
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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

Method used

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

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Embodiment Construction

[0013] refer to figure 1 . In a preferred embodiment described below, a dual-mode laser pulse emission control and echo signal processing system includes: In the laser wind radar system, through the optical fiber 8, a series of 1 fiber laser, acousto-optic Modulator 2 , pulse fiber amplifier 3 , optical antenna 4 , photodetector 5 , information processing module 6 connected in series via radio frequency cable 9 and central control computer 7 connected in series via bus 10 . The acousto-optic modulator 2 is connected in parallel with the information processing module 6 through the radio frequency cable 9, and after receiving the instruction from the central control computer 7, sends a modulation signal to the acousto-optic modulator 2, and the acousto-optic modulator 2 outputs a seed laser pulse corresponding to the modulation signal parameter, The seed laser pulse is then input into the pulse fiber amplifier 3 for power amplification output, the optical antenna 4 transmits an...

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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...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01S7/48G01S7/484
CPCG01S7/48G01S7/4802G01S7/484G01S17/95Y02A90/10
Inventor 赵彬罗雄吕明爱冯振中冯力天周杰周鼎富
Owner SOUTH WEST INST OF TECHN PHYSICS
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