Through-the-wall radar background clutter suppression method of MIMO antenna

A technology for through-wall radar and background clutter, which is applied in the field of background clutter suppression for through-wall radar with MIMO antennas, can solve the problems of difficult target positioning, undetectable, small contribution, etc., to suppress background clutter, improve the effect, and achieve good Effect of background clutter suppression

Pending Publication Date: 2022-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the echo intensity of walls and other obstacles in the room is often higher than that of the human target to be detected, which makes the target location very difficult, so it is necessary to suppress the background clutter as much as possible before locating the target
[0003] At present, the common clutter suppression methods include frame difference method, cumulative average offset method and exponential weighted offset method. The frame difference method can only observe the target with relatively large motion ran

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  • Through-the-wall radar background clutter suppression method of MIMO antenna
  • Through-the-wall radar background clutter suppression method of MIMO antenna
  • Through-the-wall radar background clutter suppression method of MIMO antenna

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[0026] The present invention is described in detail below in conjunction with the accompanying drawings and examples.

[0027] A background clutter suppression method for FMCW wall-piercing radar of MIMO antenna, such as processing process Figure 1 shown, including the following steps:

[0028] Step 1: Process the original echo data.

[0029] First, the system parameters and background estimation of the frame length used, after receiving the echo data, according to the antenna number to reorder the echo data, to obtain the antenna echo matrix Where L is the frame length, that is, the sample point data including multiple moments in each frame, generally take 30; N is the number of echo shots for each moment, and n is the number of antennas used;

[0030] Step 2: Single antenna echo principal component analysis

[0031] Echo matrix for each antenna Fast Fourier (FFT) operations are performed on each row to obtain a one-dimensional distance matrix where NFFT is the number of FFT ...

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Abstract

The invention provides a background clutter suppression method for an FMCW through-the-wall radar of an MIMO antenna, and the method comprises the steps: carrying out the reordering of original echo data according to an antenna number, carrying out the principal component analysis according to a preset frame length, estimating the background clutter, and updating a background clutter estimation result in real time through continuous iterative operation. The contribution of the current frame to a background estimation result is enhanced, so that background clutters are inhibited to the maximum extent, and the target positioning imaging effect of the radar is improved; in combination with hardware design, the background estimation frame length can be selected to achieve a better background clutter suppression effect.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a method for suppressing background clutter of through-wall radar for MIMO antennas. Background technique [0002] Unlike radars used in free space, through-wall radars need to penetrate thick walls to accurately detect and image human targets behind the walls. However, the echo intensity of walls and other obstacles in the room is often higher than that of the human target to be detected, which makes target location extremely difficult, so it is necessary to suppress the background clutter as much as possible before locating the target. [0003] At present, the common clutter suppression methods include frame difference method, cumulative average offset method and exponential weighted offset method. The frame difference method can only observe the target with relatively large motion range. When the target displacement is small, the target will be lost and canno...

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Application Information

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IPC IPC(8): G01S7/41G01S7/42G06F17/16
CPCG01S7/41G01S7/42G06F17/16
Inventor 叶修竹郭宇超方霄
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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