Signal processing method of laser radar based on empirical mode decomposition

An Empirical Mode Decomposition and lidar technology, which is applied in the field of lidar signal processing, can solve the problems of signal characteristic scale jump, inability to clearly show the inherent nature of signal frequency process, and affect the effect of EMD method filtering, etc.

Inactive Publication Date: 2007-08-15
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that if the selected neighborhood is too small, the filtering effect will be poor; if the neighborhood is too large, the inverted part of the signal will be smoothed.
[0031] However, when there is a strong inversion of the signal, or when the characteristic scale of the signal changes suddenly, using the EMD method to decompose the signal directly will cause modal aliasing
The modal aliasing phenomenon refers to the information obtained by decomposing an IMF that contains the IMF obtained after screening. Due

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Signal processing method of laser radar based on empirical mode decomposition
  • Signal processing method of laser radar based on empirical mode decomposition
  • Signal processing method of laser radar based on empirical mode decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0097] See attached picture.

[0098] As shown in Figure 1, the layered distribution of signal strength is obvious, the echo signal of the boundary layer is strong, the fluctuation is small, and the signal-to-noise ratio is high; there is a clean layer between 2-3km and 4-5km, and a layer appears at 7km Thin cirrus clouds; due to the effect of cirrus clouds, the area after 7km is basically noise.

[0099] As shown in Figure 4, in the Hilbert time spectrum, the local and overall characteristics of the signal can be investigated in both the time domain and the frequency domain. It can be seen from the figure that the lidar signal is a low-frequency signal, and the energy of the signal shown in Figure 2 is mainly distributed within the range from the boundary layer to 6km.

[0100] Figure 7 (a) shows the effect of the signal filtered by the EMD method. It can be seen from the figure that due to the existence of cirrus clouds, when the signal is decomposed by the EMD method, a mi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

This invention discloses one laser radar signal process method based on experience, which aims for laser radar signal and experience module analysis and combines small wave exchange theory and statistic test theory; using central limit theory and Late rules to test the random of the signal intensity; testing signal inverse part to keep analysis method without experience with remaining part using experience analysis method.

Description

technical field [0001] The invention relates to a laser radar signal processing method. In particular, it is suitable for situations where there is an inversion of the lidar signal. technical background [0002] The laser radar signal received by the photoelectric detector, the laser radar equation determines the main factors of the signal, the laser radar equation can be expressed as the following form: [0003] P ( r ) = P t kr - 2 [ β m ( r ) + β a ( r ) ] exp { - 2 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01S7/48G01S7/486G01S17/00
Inventor 孙东松周小林沈法华王邦新夏海云董晶晶李颖颖
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap