Multipath utilization through-the-wall radar imaging method based on Bayes compression perception

A Bayesian compression and wall-penetrating radar technology, which is applied in the direction of using re-radiation, radio wave reflection/re-radiation, instruments, etc., can solve the problems of low signal-to-noise ratio, low imaging quality, false targets, etc., and achieve observation The effect of less data volume, short transmission time, and fast calculation speed

Inactive Publication Date: 2017-05-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] Although CS-based imaging methods can effectively reduce data sampling time, data volume and save signal bandwidth, the application scenarios of through-wall radar imaging technology often have the characteristi

Method used

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  • Multipath utilization through-the-wall radar imaging method based on Bayes compression perception
  • Multipath utilization through-the-wall radar imaging method based on Bayes compression perception
  • Multipath utilization through-the-wall radar imaging method based on Bayes compression perception

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Embodiment 1

[0092] An example is given below, which is simulated by Matlab software. In the example, the simulation parameters are set as follows: wall thickness d w =0.15m, dielectric constant ε=6. The radar antenna is 0.2m away from the front wall, and the imaging area of ​​interest from 0m to 5m is scanned at an interval of 0.1m, that is, there are 51 antenna positions in total. The transmitting signal is a stepped frequency signal (201 pulse signals with a step size of 5MHz) of 2-3GHz and 1GHz bandwidth. The 1GHz bandwidth provides a resolution of 0.15m. The 5m×5m imaging region of interest was divided into 25×25 grids, and the number of grids was 625. Considering the three paths of direct reflection of the target, primary reflection inside the wall and reflection of the side inner wall, the grid parameters are calculated for each path to construct a dictionary. The number of measurements L is set to ten. The three targets are located at (1.7m, 0.9m), (2.5m, 4.5m) and (4.1m, 2.7m...

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Abstract

The invention discloses a multipath utilization through-the-wall radar imaging method based on the Bayes compression perception. A single station single transceiving antenna frequency stepping radar system is used for emitting pulse strings in multiple positions parallel to a wall face and acquiring echo signals; compression sampling is performed on the echo signals by randomly measuring a matrix so as to obtain relatively few measurement signals; then, by combining a dictionary construction compression perception model designed based on the multipath reflection characteristics of the wall face, the Bayes compression perception is used for reconstructing information of scenes after the wall face from the measurement signals; and finally the reconstructed information is sued for finishing through-the-wall radar imaging. According to the invention, cost is reduced; recording time is shortened; by use of the Bayes compression perception technology, calculation speed is quite fast, and required observation data are quite few; and the precision of images obtained through combination of the multipath utilization method is quite high and occurrence of false shadows is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar imaging, and in particular relates to a method for achieving the purpose of through-wall imaging by using the principle of Bayesian Compressive Sensing (BCS) and utilizing the wall multipath reflection phenomenon to process radar received signals. Background technique [0002] In recent years, through-wall radar imaging technology has received more and more attention in both military and civilian fields. In many scenarios such as building demolition, post-disaster rescue, and urban anti-terrorism operations, there are problems in detecting hidden targets inside buildings or behind obstacles. Traditional through-the-wall radar systems often need to use multiple observation antennas as a large physical aperture or move a single observation antenna to multiple observation positions to synthesize a large aperture to obtain greater distance resolution. In this way, the system cost is high a...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/888G01S13/89
Inventor 蔡杰松施江南尹佳黄慧
Owner NANJING UNIV OF SCI & TECH
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