Method and device for obtaining micro-motion characteristics
A feature extraction and feature subset technology, applied in the field of data processing, can solve problems such as low accuracy of warhead targets
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0127] Such as figure 1 As shown, the micro-movement feature acquisition method provided by the embodiment of the present invention may include the following steps:
[0128] Step 101: Obtain the radar echo signal of the warhead target;
[0129] Step 102: Perform time-frequency analysis on the radar echo signal to obtain a signal energy distribution function;
[0130] Step 103: Extract at least one micro-motion feature of the warhead target according to the signal energy distribution function and the radar echo signal;
[0131] Step 104: Filter the extracted micro-movement features through a support vector machine (SVM) classifier to obtain an optimal feature set including at least one micro-motion feature.
[0132] In the micro-movement feature acquisition method provided by the embodiment of the present invention, after acquiring the radar echo signal of the warhead target, the corresponding signal energy distribution function is obtained by performing time-frequency analysis...
Embodiment 2
[0134] On the basis of the micro-movement feature acquisition method provided in Embodiment 1, the process of obtaining the signal energy distribution function by performing time-frequency analysis on the radar echo signal in step 102 can be specifically implemented in the following manner:
[0135] The Wigner-Ville distribution is used to analyze the time-frequency of the radar echo signal, and the signal energy distribution function of the warhead target is obtained, that is, the specific form of the Wigner-Ville distribution signal energy distribution function of the radar echo signal s(t) is as follows:
[0136]
[0137] where, where, W z (t, f) represents the distribution of the signal energy of the radar echo signal in the time domain and frequency domain, the function z(t) represents the analytical signal of the radar echo signal s(t), and the function z * (t) is obtained by performing Fourier transform on the function z(t), which can represent the analytical signal ...
Embodiment 3
[0140] On the basis of the micro-movement feature acquisition method provided in Embodiment 2, after obtaining the signal energy distribution function of the warhead target, a time-frequency diagram corresponding to the radar echo signal is generated according to the signal energy distribution function, and then the time-frequency diagram can be In the micro-motion region, the frequency amplitude of the time-frequency diagram on the frequency axis can be determined. The frequency amplitude is the width of the time-frequency diagram, and the width of the time-frequency diagram can describe the precession of the warhead target. The width of the frequency map is determined as a fretting feature of the warhead target.
[0141] After the time-frequency diagram is generated according to the signal energy distribution function, the region containing the micro-Doppler frequency is determined on the time-frequency diagram, which is the micro-motion region. By extracting the time-freque...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com