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Self-adaptive feedback control device and method

A feedback control and self-adaptive technology, applied in the direction of measuring devices, ICT adaptation, electromagnetic wave re-radiation, etc., can solve the problems affecting the signal-to-noise ratio performance of photodetectors, and achieve the effect of improving the detection distance and detection accuracy

Pending Publication Date: 2020-11-24
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Since the selection of the bypass feedback capacitor is closely related to the parasitic capacitance, the parameters of different photodetectors cannot be completely consistent. optimal value, which affects the signal-to-noise ratio performance of the photodetector

Method used

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  • Self-adaptive feedback control device and method

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Embodiment Construction

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

[0023] The terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present disclosure. The words "a", "an" and "the" used herein shall also include the meanings of "plurality" and "multiple", unless the context clearly indicates otherwise. The terms "comprising", "comprising", etc. used herein indicate the presence of stated features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[002...

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Abstract

The invention discloses a self-adaptive feedback control device which is applied to a laser wind finding radar detector, and comprises a photoelectric detector, which is used for converting an opticalsignal detected by the laser wind finding radar detector into an electric signal; an analog signal processing module which is used for converting the electric signal into a differential pulse signal;a high-speed AD conversion module which is used for continuously sampling the differential pulse signal and converting the differential pulse signal into a digital signal; a digital signal processingmodule which is used for calculating the current signal-to-noise ratio of the photoelectric detector according to the digital signal, comparing the current signal-to-noise ratio with a preset optimalsignal-to-noise ratio and generating a feedback control quantity according to a comparison result; and a DAC feedback module which is used for adjusting the working bias voltage of the photoelectricdetector according to the feedback control quantity. The self-adaptive feedback control device provided by the invention can perform self-adaptive feedback control on the working bias voltage of the photoelectric detector, so that the laser wind finding radar detector works in an optimal signal-to-noise ratio state, and the detection distance and the detection precision of the laser wind finding radar are improved.

Description

technical field [0001] The present disclosure relates to the technical field of laser wind radar measurement, and in particular to a photodetector self-adaptive feedback control device and method. Background technique [0002] The photodetector is one of the key devices in the wind lidar receiving system. In lidar, the signal-to-noise ratio of the photodetector system determines the effective detection distance and wind speed measurement accuracy of the lidar. Since the output amplitude of the photodetector is very small, in order to increase the output amplitude, it is necessary to use a diode with a large sensing surface and a feedback resistor with a high resistance value. However, a diode with a large sensing surface will increase the junction capacitance, and a high-value feedback resistor will cause the bypass effect of the parasitic capacitance, which will affect the bandwidth of the circuit. [0003] In order to overcome these effects, the method in the prior art i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/4861G01S17/95H03F3/45
CPCG01S7/4861G01S17/95H03F3/45Y02A90/10
Inventor 陈炼王睿金革
Owner UNIV OF SCI & TECH OF CHINA
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