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Micro-Doppler estimation method for passive target motion tracking

A motion tracking and target technology, applied in the field of micro-Doppler estimation of passive target motion tracking, can solve the problems of residual noise passband signal, interference, etc., and achieve the goal of reducing interference, avoiding distortion, and ensuring authenticity and continuity Effect

Inactive Publication Date: 2019-04-16
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Aiming at the problem that the existing passive target micro-Doppler estimation method is susceptible to residual noise and passband signal interference, the present invention proposes a micro-Doppler estimation method for passive target motion tracking

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  • Micro-Doppler estimation method for passive target motion tracking
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  • Micro-Doppler estimation method for passive target motion tracking

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Embodiment Construction

[0046] The present invention will be described in further detail below according to accompanying drawing:

[0047] The technical solution proposed by the present invention is: a micro-Doppler estimation method for passive target motion tracking, such as figure 1As shown, it specifically includes the following steps:

[0048] Step 1: Use the method of conjugate multiplication of CSI signals on different antennas to compensate for phase errors such as STO and CFO in the collected CSI signals due to asynchronous transmission and receiving ends, where the CSI on the reference antenna is expressed as The CSI on the antenna multiplied by its conjugate is expressed as The final result is expressed as C(m)=H(m)*H(m 0 ) * .

[0049] Step 2: Use a high-pass filter to remove the product part of the static path component in C(m) after conjugate multiplication, ignore the multiplication part of the pure dynamic path component, and get the margin

[0050] Step 3: According to the t...

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Abstract

The invention discloses a micro-Doppler estimation method for passive target motion tracking. Firstly, signal preprocessing operations such as phase error compensation, multipath signal separation, one-dimensional linear interpolation and principal component analysis are performed on an inputted CSI time sequence; then, short-time Fourier transform is used for time-frequency analysis on the obtained first principal component, a dynamic sliding window is used to solve the local maximum value and extract a continuous instantaneous energy change curve for the obtained power spectral density matrix; and a Doppler change curve after Doppler distortion correction is finally obtained. The method disclosed in the invention can be used to solve the micro-Doppler frequency shift with a sign caused by passive target movement and further realize tracking on a target trajectory and a direction; and the problem that the traditional micro-Doppler estimation method is likely affected by residual noiseand passband signal interference can be solved, and the continuity between data points on the extracted Doppler change curve can be effectively enhanced.

Description

technical field [0001] The invention belongs to the field of mobile communication technology and digital signal processing, and in particular relates to a micro-Doppler estimation method for passive target motion tracking. Background technique [0002] With the rapid development of the information industry, while people enjoy the great convenience brought by the communication network to production and life, the demand for Sensing Based Services (SBS) for personal consumption intelligence is also showing a substantial increase. Target detection, positioning and tracking, etc. Early perception technologies generally include technologies based on infrared rays, ultrasonic waves, and sensor networks (Wireless Sensor Networks, WSN). These sensing technologies can achieve high accuracy under certain conditions, but there are some inherent problems. For example, most ultrasonic-based sensing systems require professional equipment, and the system cost is high, which is not conduciv...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0294
Inventor 田增山杨惟钦周牧金悦谢良波王勇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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