Power Spectrum Detection Method for External Ballistic Velocity Radar Based on Improved Wavelet Threshold Denoising

A wavelet threshold denoising and speed radar technology, applied in the radar field, can solve the problems of signal oscillation, pseudo-Gibbs phenomenon, discontinuity of hard threshold function, etc., and achieve the effect of improving data signal-to-noise ratio and suppressing noise.

Active Publication Date: 2019-06-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Hard threshold and soft threshold are two commonly used contraction rules, but the hard threshold function is discontinuous at the threshold point, and the reconstructed signal may oscillate, resulting in pseudo-Gibbs phenomenon; the soft threshold function processed There is a constant deviation between the signal and the true signal

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  • Power Spectrum Detection Method for External Ballistic Velocity Radar Based on Improved Wavelet Threshold Denoising
  • Power Spectrum Detection Method for External Ballistic Velocity Radar Based on Improved Wavelet Threshold Denoising
  • Power Spectrum Detection Method for External Ballistic Velocity Radar Based on Improved Wavelet Threshold Denoising

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Embodiment Construction

[0018] combine figure 1 , a power spectrum detection method for outer ballistic velocity radar based on improved wavelet threshold denoising, including the following steps:

[0019] Step 1, use the Sym6 wavelet base to decompose the noise-added analog power spectrum data with a scale of 5, and obtain the wavelet coefficient w at each scale j,k , j is the scale of wavelet decomposition, and k represents the kth wavelet coefficient.

[0020] Step 2, select the threshold. In practice, after the noise-containing signal is decomposed by wavelet transform, as the scale increases, the amplitude of the wavelet coefficient of the noise becomes smaller and smaller, while the amplitude of the wavelet coefficient of the signal becomes larger and larger. Therefore, the selection of thresholds at different scales should also be different, so that it can adapt to the noise distribution of each layer. use In the formula, N is the number of wavelet transform coefficients of the correspond...

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Abstract

The invention provides an external trajectory speed-measuring radar power spectrum detection method based on improved wavelet threshold de-noising, and the method comprises the following steps: carrying out the wavelet transformation of the power spectrum data, selecting a Sym6 wavelet for the five-layer decomposition of the power spectrum data, and obtaining a wavelet coefficient at each scale; selecting a threshold value, carrying out the evaluation of the wavelet coefficient greater than the threshold value according to a threshold function equation, discarding the wavelet coefficient less than the threshold value, and obtaining a group of estimated wavelet coefficients; carrying out the wavelet transformation through the estimated wavelet coefficients, and reconfiguring a wavelet signal estimation value.

Description

technical field [0001] The invention relates to a radar technology, in particular to a power spectrum detection method of an external ballistic speed measuring radar based on improved wavelet threshold denoising. Background technique [0002] The external ballistic speed measuring radar is used to measure the flight speed of the projectile, which is an important content in the test of various motion parameters of the weapon system. The speed measurement principle of the external ballistic speed measurement radar is to use the Doppler effect generated when the electromagnetic wave propagates in space and encounters a moving target, that is, where λ 0 is the wavelength of the emitted electromagnetic wave. as long as f d , the radial velocity v can be obtained from the formula r . The external ballistic speed measuring radar uses spectrum analysis method to measure the Doppler frequency, which is to convert the signal frequency into a power spectrum value, obtain the freq...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/58
CPCG01S7/40G01S13/58
Inventor 蔡征宇叶心静程风雷李亚飞杜莹莹张建城
Owner NANJING UNIV OF SCI & TECH
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