Life signal enhancement method based on segmented and classified enhancement processing

A technology of enhanced processing and segmentation classification, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc. Remarkably precise effect

Active Publication Date: 2019-04-16
XI AN JIAOTONG UNIV +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In many existing technical methods, all the data in the signal matrix are processed, and the target signal cannot be processed in a targeted manner. In order to better detect the life signal, an effective life signal enhancement algorithm is designed.

Method used

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  • Life signal enhancement method based on segmented and classified enhancement processing
  • Life signal enhancement method based on segmented and classified enhancement processing
  • Life signal enhancement method based on segmented and classified enhancement processing

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Experimental program
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Embodiment

[0065] The center frequency of the radar is 400MHz, 4096 points are sampled in the fast time, and 512 frames of data are taken in the slow time, and the signal matrix R of 4096×512 is obtained as the original data of the radar.

[0066] The background clutter in the original data is removed by using the time domain averaging method to obtain image 3 In the signal matrix shown, it can be vaguely seen from the figure that the signal at 3.5 meters may have a target signal but it cannot be determined. The registration blocks obtained by simulation are used to classify segments, and then the different categories are processed separately to obtain Figure 4 The time-domain effect diagram shown, the final signal matrix obtained after multi-frame correction and local normalization is as follows Figure 5 As shown, transforming to the frequency domain, the frequency diagram is as follows Image 6 As shown, it can be clearly seen from the figure that the life signal at 3.5 meters has ...

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Abstract

The invention discloses a life signal enhancement method based on segmented and classified enhancement processing, which is used for removing background clutters of the ultra wide band radar echo signals; selecting a target signal registration block by utilizing simulation scene simulation data; and judging whether the actual measurement window is matched with the registration block or not by using a sliding window, performing classified and segmented denoising and enhancement on a radar signal matrix, performing multi-frame weighting processing on a processing result, and finally enhancing aremote signal by using a local normalization method to obtain a finally enhanced signal matrix for positioning and detecting a life entity. According to the invention, enhancement of life signals is realized; different types of signal matrix blocks are processed differently, denoising and enhancement are effectively carried out for the types of signals, correction is carried out by utilizing adjacent frames, and the amplitude of remote signals is enhanced, so that the position of a target signal is more obvious and accurate in both a time domain and a frequency domain, and a guarantee is provided for subsequent detection.

Description

technical field [0001] The invention belongs to the technical field of radar life weak signal enhancement, and in particular relates to a life signal enhancement method based on segment classification enhancement processing. Background technique [0002] When encountering natural disasters such as earthquakes, mudslides, and fires, a large number of houses collapse, which may cause people to be buried. At the same time, due to the impact of potential threats, certain non-contact detection technologies are required to detect whether there is life information in the area. Therefore, how to quickly, accurately and effectively detect the life forms under the ruins is particularly important. [0003] In the rescue process, due to the uncertain existence, location and number of trapped people, how to quickly find and locate the living body is the main problem in organizing rescue operations. In order to improve rescue efficiency and save rescue costs, ultra-wideband radar electrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S7/41
CPCG01S7/414G01S13/887G01S13/888
Inventor 侯兴松黑夏萌王生霄
Owner XI AN JIAOTONG UNIV
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