Echo signal processing equipment and method of Doppler speed measuring laser radar

A Doppler velocity measurement and echo signal technology, applied in measurement devices, re-radiation of electromagnetic waves, radio wave measurement systems, etc., can solve the problems of high noise threshold and poor measurement result accuracy, to ensure accuracy and improve real-time performance. , the effect of reducing the amount of calculation

Inactive Publication Date: 2008-12-10
BEIHANG UNIV
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Problems solved by technology

[0015] The purpose of the embodiments of the present invention is to provide an echo signal processing device and method of a Doppler speed measuring laser radar, so as to solve the shortcomings of the existing technical solutions, such as high noise threshold and poor accuracy of measurement results

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  • Echo signal processing equipment and method of Doppler speed measuring laser radar
  • Echo signal processing equipment and method of Doppler speed measuring laser radar
  • Echo signal processing equipment and method of Doppler speed measuring laser radar

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Embodiment Construction

[0027] In the embodiment of the present invention, different filtering frequency ranges are preset to correspond to different sampling rates, and adjacent filtering frequency ranges overlap each other, and each filtering frequency range and corresponding sampling rate are stored in association.

[0028] According to the initial frequency value of the amplified echo signal, query the corresponding relationship between the preset filtering frequency range and sampling rate, obtain the filtering frequency range and sampling rate corresponding to the initial frequency value, according to the filtering frequency Band-pass filtering is performed on the echo signal, the filtered echo signal is sampled according to the sampling rate, the analog echo signal obtained by sampling is converted into a digital signal, and the digital signal is stored.

[0029] Read the stored digital echo signal, perform FFT (Fast Fourier Transform, Fast Fourier Transform) of 2 times the sampling points on t...

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Abstract

The invention provides a Doppler velocity metering laser radar echoed signal processing unit and a method. The processing unit mainly comprises a signal storage module and a DSP module; wherein, the signal storage module is used for storing the echoed signals of a tested object; the echoed signals are digital signals which are converted by A / D; the DSP module is used for reading the echoed signals in the signal storage module and carrying out the FFT to obtain the power spectrum of the signals, and then the rough estimated frequency value is obtained according to the power spectrum; the power spectrum is carried out the inverse FFT and then the self correlation functions of the echoed signals are obtained, the correction frequency value is obtained according to the self correlation functions, the rough estimated frequency value and the correction frequency value are added to obtain the Doppler frequency of the echoed signals, and the movement velocity of the tested object is calculated according to the Doppler frequency. The device and the method combine the self correlation technology with the frequency deviation estimation improvement algorithm which is based on the frequency deviation correction, and the velocity of the test object can be effectively worked out.

Description

technical field [0001] The invention relates to the field of optical and electronic applications, in particular to an echo signal processing device and method of a Doppler speed measuring lidar. Background technique [0002] Lidar is a radar with laser beams as the information carrier. Lidar can not only measure distance accurately, but also measure speed accurately, track accurately and image with high resolution. Lidar has a wide range of applications and can be used in many fields such as military, aerospace and industrial production. [0003] Doppler speed measurement lidar is a kind of laser radar based on the optical Doppler effect, which can be used to measure the flow velocity of liquid and gas or the movement velocity of solid targets, and has a very wide range of applications in science and industrial technology. [0004] The Doppler speed measuring lidar adopts the active detection method. The system emits a laser with a certain waveform to irradiate the measure...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48G01S17/58
Inventor 冯迪王纪强欧攀张春熹贾豫东田伦
Owner BEIHANG UNIV
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