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Frequency-sweeping nonlinear correction distance measurement method based on similar triangular interpolation sampling

A technology of interpolation sampling and similar triangles, which is applied in the field of frequency sweep nonlinear correction ranging system, can solve the problems of inability to provide resampling sequence, incomplete elimination of frequency sweep nonlinearity, and decreased accuracy of sweep frequency interferometry, achieving high real-time Sexual processing, elimination of spectrum broadening effect, small error effect

Active Publication Date: 2021-06-11
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to propose a frequency sweep nonlinear correction based on similar triangular interpolation sampling in view of the problems that the existing methods cannot provide accurate resampling sequences, the frequency sweep nonlinearity is not completely eliminated, and the accuracy of sweep frequency interferometry decreases. ranging method

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  • Frequency-sweeping nonlinear correction distance measurement method based on similar triangular interpolation sampling
  • Frequency-sweeping nonlinear correction distance measurement method based on similar triangular interpolation sampling
  • Frequency-sweeping nonlinear correction distance measurement method based on similar triangular interpolation sampling

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specific Embodiment approach 1

[0058] Specific implementation mode one: refer to figure 1 , figure 2 and image 3 This embodiment is described in detail. The frequency-sweeping nonlinear correction ranging method based on similar triangular interpolation sampling described in this embodiment is implemented by a frequency-sweeping nonlinear correction device;

[0059] The frequency-sweeping nonlinear correction device includes: a measuring interferometer, an auxiliary interferometer and an acquisition card;

[0060] The measuring interferometer includes a PBS, a focusing optical system, a 1 / 4 wave plate and a balance detector;

[0061] The auxiliary interferometer includes two 3dB fiber couplers;

[0062] After the frequency-sweeping laser is split by a fiber coupler with a splitting ratio of 95:5, 95% of the frequency-sweeping light and 5% of the frequency-sweeping light are obtained, and 95% of the frequency-sweeping light is divided into The measurement light of the measurement interferometer and the...

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Abstract

The invention discloses a frequency-sweeping nonlinear correction distance measurement method based on similar triangular interpolation sampling, and relates to the technical field of frequency-sweeping interference (FSI) measurement, FMCW laser radar and the like. In allusion to the problem that an existing method cannot provide an accurate resampling sequence, is not thorough in frequency-sweeping nonlinearity elimination and results in reduction of the precision of frequency-sweeping interference measurement, the method is used for eliminating the spectrum broadening effect generated by the frequency-sweeping nonlinearity of the sweep frequency laser, and the excellent property of measuring the full width at half maximum of the spectrum can be effectively improved. Especially, when the limit distance is measured, the error is smaller than that of taking a near zero point as a sampling point. Meanwhile, the signal processing speed of the similar interpolation algorithm is increased due to the fact that matrix multiplication is used. According to the invention, high-precision and high-real-time processing of a measurement result is ensured when the absolute distance measurement system carries out remote measurement.

Description

technical field [0001] The invention relates to technical fields such as frequency-sweeping interferometry (FSI) measurement, FMCW laser radar, etc., and specifically relates to a frequency-sweeping nonlinear correction ranging system and method based on similar triangular interpolation sampling. Background technique [0002] Sweeping frequency interferometry has the advantages of low transmission power, no ranging ambiguity, no need for guide rail cooperation, can be applied to cooperative target measurement, and can achieve high-resolution measurement, so it has been widely used in the field of high-precision absolute distance measurement, such as frequency modulation Continuous laser radar, optical frequency meter, optical coherence tomography and other fields. The basic principle is to determine the absolute distance of the target by using the fixed frequency difference between the emitted measurement optical signal and the frequency-sweeping measurement optical signal r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497G01S7/4861G01S17/08
CPCG01S7/497G01S7/4861G01S17/08
Inventor 甘雨刘国栋段长昊陈凤东刘炳国卢丙辉
Owner HARBIN INST OF TECH
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