One-dimensional range profile high resolution imaging method capable of suppressing wideband phase noise
A phase noise, imaging method technology, applied in the field of radar, to achieve the effect of good anti-noise performance
Active Publication Date: 2017-09-22
SICHUAN HONGCHUANG ELECTRONICS TECH
View PDF4 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] What the present invention aims to solve is to propose a one-dimensional range-image high-resolution imaging method capable of suppressing broadband phase noise to observe the target scene by using the broadband signal emitted by the broadband radar, and using the Fourier basis of the observation matrix to solve the above problems. characteristics and the structural characteristics of the phase recovery problem, establish the implicit convexity of the one-dimensional range image imaging problem and effectively suppress the phase noise in the echo data, and then realize the high-resolution imaging of the one-dimensional range image
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0039] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:
[0040] The radar geometry used in the present invention is as figure 1 As shown, wherein the broadband radar continuously transmits and receives pulses to the target scene, the specific implementation steps of the present invention are as follows:
[0041] Step 1, construct a one-dimensional range image imaging model with phase noise interference:
[0042] 1.1) Broadband radar works in the microwave band, and the target length is much longer than the wavelength. At this time, the target can be approximated as a set of discrete ideal scattering points. After the transmitted signal is delayed and amplitude modulated by each scattering point, a scattering point echo is formed. The target echo That is, the sum of the sub-echoes of each scattering point, from which the one-dimensional range scattering center model can be obtained:
[0043]
[00...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of radar, and relates to a one-dimensional range profile high resolution imaging method capable of suppressing wideband phase noise. The method mainly comprises steps: firstly, within the bandwidth of signals transmitted by a wideband radar, oversampling discrete processing is carried out on radar echo signals, and a one-dimensional range profile imaging model based on phase retrieval is built; then, Fourier basis properties of an observation matrix are used for converting the one-dimensional range profile imaging non-convex problem based on phase retrieval to a convex problem based on autocorrelation recovery; an augmented Lagrangian function is built, the derivative of the function relative to an autocorrelation vector is calculated and is made to be zero, and an iterative equation related to the autocorrelation vector is obtained; iterative processing is executed until a residual is smaller than a predetermined threshold or the iterations are larger than the maximum iterations, and the optimal autocorrelation vector is obtained; and finally, under the minimum phase criterion, as for the solved autocorrelation vector, a Kovmogolov spectral decomposition method is used for solving a corresponding scattering coefficient vector.
Description
technical field [0001] The invention belongs to the technical field of radar, and relates to a one-dimensional range image high-resolution imaging method capable of suppressing broadband phase noise. Background technique [0002] Radar High Resolution Range Profiles (HRRP) is a one-dimensional projection of target reflection characteristics on the radar line of sight, including the number, distribution and radial length of target scattering points, reflecting the fine longitudinal structure of the target , is of great significance to target detection, tracking and recognition, and has important application value in engineering practice. [0003] According to electromagnetic theory, when the electrical size of the target scatterer is much larger than the wavelength, the high-frequency electromagnetic scattering properties of the target can be represented by the synthesis of local scattering properties, which are usually called equivalent scattering centers. On the basis of t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/41G01S13/89
Inventor 张庆颜铭江邢玲卢铭迪杨悦丛迅超万群黄忠涛龙柯宇
Owner SICHUAN HONGCHUANG ELECTRONICS TECH