Spread spectrum through-the-wall radar imaging method based on compression perception technology

A through-wall radar and compressed sensing technology, applied in the field of spread spectrum through-wall radar imaging, can solve the problems of large data storage space, long data recording time, and large number of observation antennas

Active Publication Date: 2016-08-31
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a spread-spectrum through-wall radar imaging method based on compressed sensing technology, which solves the problem of the lar...

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  • Spread spectrum through-the-wall radar imaging method based on compression perception technology
  • Spread spectrum through-the-wall radar imaging method based on compression perception technology
  • Spread spectrum through-the-wall radar imaging method based on compression perception technology

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specific Embodiment

[0103] model such as image 3 As shown, the imaging area is a square area of ​​3m×3m, the wall is 20cm thick, its conductivity is 0.03, and its dielectric constant is 4.5. The transmitting antenna T is located at (0m,-1m), and the receiving antenna R is located at (0.2m, -1m), the two moved 57 times at an interval of 5cm, as all observation points. The transmitted signal is a pseudo-random continuous wave signal with a center frequency of 2GHz and a bandwidth of 2GHz. The M-sequence contains 1023 chips. ADC is 10Gsps, 16 bits. The SNR of the noise is 34dB.

[0104] The receiving antenna receives a set of time-domain echo information at the 20th observation position, such as Figure 5 As shown in , it can be seen that effective target information cannot be obtained from time domain information, and effective information can only be obtained after despreading and related processing, as shown in Figure 6 As shown, the amplitude values ​​of the direct wave and the wall clutt...

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Abstract

The present invention discloses a spread spectrum through-the-wall radar imaging method based on the compression perception technology. After an index average background elimination method is employed to remove the direct wave and the wall clutter, measurement signals are obtained through a random measurement matrix, a dictionary having been set and the measurement matrix are combined to construct a compressed perception model of a multi-measurement vector (MMV), target image information after the all is reconstructed from the measurement including few measurement values through an orthogonal matching pursuit (OMP) method, and finally, the through-the-wall radar is completed according to the target after the wall. Compared with a traditional synthetic aperture radar imaging method, the spread spectrum through-the-wall radar imaging method based on the compression perception technology is able to greatly reduce the number of the observation points and the data storage amount and shorten the recording time. The problems are solved that the spread spectrum through-the-wall radar SAR imaging method in the prior art requires lots of observation antennas, large data storage space and long data recording time.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar life detection, and in particular relates to a spread-spectrum through-wall radar imaging method based on compressed sensing technology. Background technique [0002] In recent years, radar-based through-wall life detection technology has been widely used in many military and civilian fields such as building structure determination, post-disaster rescue (fire, snow disaster, earthquake, etc.), anti-terrorism, and street fighting. In the field of radar-based life detection imaging through walls, the back projection (Back Projection, BP) algorithm is often used for synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging of targets behind walls. To determine the location of objects behind walls as accurately as possible, BP imaging methods require broadband, large-aperture radar systems to achieve very high range resolution. However, large-aperture through-wall radar imaging syst...

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S7/411G01S13/9011
Inventor 蒲玉蓉张学辉张金生席晓莉
Owner XIAN UNIV OF TECH
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