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Target micro-Doppler component extraction method based on centroid calculation

A Doppler component and extraction method technology, which is applied in the field of coherent lidar speed measurement, can solve problems such as complex devices and algorithms, achieve simple methods, high real-time performance, and overcome low real-time performance

Active Publication Date: 2020-05-19
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention aims at eliminating the Doppler component of the existing laser radar, extracting the device and the complex algorithm of the micro-Doppler component, and proposes a method for calculating the centroid of the spectrum. Frequency mixing and phase shift in the interference signal, thereby eliminating the Doppler component, and then recovering the target micro-movement characteristics

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  • Target micro-Doppler component extraction method based on centroid calculation
  • Target micro-Doppler component extraction method based on centroid calculation
  • Target micro-Doppler component extraction method based on centroid calculation

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention should not be limited thereby.

[0041] Such as figure 1 As shown, a target micro-Doppler component extraction method based on centroid calculation includes the following steps:

[0042] Step 1) Utilize laser radar to collect target motion echo signal;

[0043] Step 2) Perform double-balanced heterodyne detection on the motion echo signal to obtain the I signal E with a phase difference of 90° I and Q signal E Q , the formula is as follows;

[0044]

[0045]

[0046] Among them, h, k are the zero drift of the two signals, R(t) is the distance between the two places, δ 1 ,δ 2 is two phase disturbances, n I (t), n Q (t) is the random disturbance of two-way amplitude;

[0047] Step 3) For I signal V I and Q signal V Q perform segment processing;

[0048] Step 4) Orthogonalization pro...

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Abstract

The invention provides a target micro-Doppler component extraction method based on centroid calculation. The method includes the steps of the collection of target motion I and Q echo signals, data segmentation, orthogonalization processing, complex processing, FFT transformation, threshold value setting and noise floor removal, the removal of out-of-band noise by estimating a target frequency bandrange, frequency spectrum centroid solution, the frequency mixing with an original complex signal after the centroid is obtained, namely, the removal of interference of Doppler quantity generated bytarget translation to obtain characteristics of a target micro-motion. The method has the advantages of simple calculation, strong operability, high precision and high real-time performance and effectively overcomes the defects of low real-time performance, complex device and high priori information requirement of an existing algorithm.

Description

technical field [0001] The invention belongs to the field of coherent laser radar speed measurement, and mainly relates to a method for separating target Doppler and micro-Doppler components. Background technique [0002] LiDAR is widely used in the field of detection, and the detection of the details of the target's motion state has become a hot research direction, and the micro-Doppler features introduced by the target's micro-motion have become the basis for target recognition. V.C.Chen proposed in Proceeding of SPIE in 2000 that micro-motion and micro-Doppler phenomena in microwave radar can be obtained from radar through high-resolution time-frequency analysis technology, and established the micro-motion mathematics of vibration, rotation, roll and precession Model. Fretting refers to the small movements of the target or some of its components other than the translation of the center of mass, such as vibration, precession, rotation, etc. When the target moves slightly...

Claims

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Application Information

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IPC IPC(8): G01S7/4915G01S17/50G01S17/88
CPCG01S7/4915G01S17/50G01S17/88
Inventor 孙建锋李跃新卢智勇贺红雨韩荣磊从海胜劳陈哲蔡新雨
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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