High-efficiency global rectangular coordinate projection fusion improved FFBP imaging method
A rectangular coordinate, imaging method technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc. Point-by-point interpolation, the effect of excellent algorithm efficiency
Active Publication Date: 2020-10-02
XIDIAN UNIV
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the fusion of subgraphs in different local polar coordinate systems relies on "point-to-point" two-dimensional interpolation, which brings a huge amount of computation and also leads to the accumulation of interpolation errors
In engineering applications, the imaging accuracy and efficiency of the FFBP algorithm are mutually restricted, and it is difficult to balance
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
[0044] The embodiments of the present invention will be described in detail below in conjunction with the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.
[0045] like figure 1As shown, it is a flowchart of an improved FFBP imaging method for efficient global rectangular coordinate projection fusion, which specifically includes the following steps:
[0046] Step 1, use synthetic aperture radar to receive the echo signal g(t,t m ), for the echo signal g(t,t m ) to perform range-matched filtering to obtain the range-compressed signal s(t,t m ).
[0047] Specifically, as figure 2 As shown, it is the working geometry of the strip-type synthetic aperture radar. The radar platform flies at a constant speed along the azimuth direction X at the speed v, and always keeps the antenna beam pointing unchanged (the radar obliqu...
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 SAR imaging, and discloses a high-efficiency global rectangular coordinate projection fusion improved FFBP imaging method, which comprises the followingsteps: receiving an echo signal by using synthetic aperture radar, and performing range direction matched filtering on the echo signal to obtain a signal after range compression; establishing a global rectangular coordinate system by taking the center of the synthetic aperture as an original point, and uniformly dividing the full-aperture data after distance compression into N sub-aperture data;constructing a global rectangular coordinate projection grid in the imaging area, and performing backward projection on each piece of sub-aperture data on the global rectangular coordinate projectiongrid to obtain a sub-aperture imaging result; and under the global rectangular coordinate projection grid, performing recursive fusion on sub-aperture imaging results to obtain a full-aperture high-resolution image. According to the method, the limitation of a traditional FFBP algorithm based on a local polar coordinate grid is broken through, the advantages of global rectangular coordinate grid projection and recursion fusion are fully utilized, two-dimensional point-by-point interpolation and coordinate conversion are avoided, and the processing efficiency is high.
Description
technical field [0001] The invention relates to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging, in particular to an improved FFBP imaging method for efficient global rectangular coordinate projection fusion, which can be used for airborne and other SAR imaging processing platforms, and is suitable for various complex imaging occasions high-precision real-time imaging. Background technique [0002] The time-domain Back-projection (BP) imaging algorithm realizes accurate imaging under any track and radar working mode through slant range back-projection and coherent addition. However, the time-domain backward projection imaging algorithm has high time complexity, which limits its engineering application in large-scale imaging applications. [0003] In order to improve the efficiency of the time-domain backprojection imaging algorithm, some fast time-domain imaging algorithms have been proposed one after another, among which the fast fac...
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): G01S13/90G01S7/41
CPCG01S13/9021G01S7/41
Inventor 梁毅刘国梁梁宇杰邢孟道
Owner XIDIAN UNIV