CN114740473B - Circular synthetic aperture radar imaging method, system, device, medium and terminal - Google Patents
Circular synthetic aperture radar imaging method, system, device, medium and terminal Download PDFInfo
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- CN114740473B CN114740473B CN202210318294.7A CN202210318294A CN114740473B CN 114740473 B CN114740473 B CN 114740473B CN 202210318294 A CN202210318294 A CN 202210318294A CN 114740473 B CN114740473 B CN 114740473B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
- G01S13/9052—Spotlight mode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
- G01S13/9088—Circular SAR [CSAR, C-SAR]
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Abstract
The invention belongs to the technical field of radar signal processing, and discloses a circumferential synthetic aperture radar imaging method, a system, equipment, a medium and a terminal, wherein the method comprises the steps of performing aperture segmentation on complete CSAR data, and respectively imaging sub-aperture data by combining the data by adopting a rapid algorithm to obtain sub-images; registering partial images positioned on different elevation planes in the sub-aperture images as references to obtain a group of CSAR images with different depth of field, and performing multi-focus fusion on the obtained images with different depth of field to obtain a full-focus image. The invention uses the principle of multi-focus fusion imaging of optical images to be suitable for CSAR imaging of a relief area of the terrain, reduces local area defocusing caused by elevation errors in CSAR two-dimensional imaging, is convenient to use, only carries out one-time imaging processing, acquires a plurality of CSAR images with different focusing depths, reduces the calculated amount of an algorithm, solves the problem of image focusing under the condition of no external elevation auxiliary data, and acquires a high-quality CSAR two-dimensional imaging result.
Description
Technical Field
The invention belongs to the technical field of radar signal processing, and particularly relates to a circumferential synthetic aperture radar imaging method, a circumferential synthetic aperture radar imaging system, a circumferential synthetic aperture radar imaging equipment, a circumferential synthetic aperture radar medium and a circumferential synthetic aperture radar terminal.
Background
At present, synthetic aperture radar (SYNTHETIC APERTURE RADAR, SAR) imaging is an important high-resolution earth observation technical means, and has the characteristic of all-weather operation all day, so that rapid development and wide attention are paid in recent years. To meet the ever-increasing military and civilian needs, SAR technology evolves in a number of directions. The Circumferential SAR (CSAR) technique is a major representative of the manifold evolution of the radar synthetic aperture. The aperture manifold refers to the track form formed by the radar receiving and transmitting channel in the imaging movement process. Compared with a linear aperture manifold represented by a traditional linear track SAR, CSAR imaging forms a 360-degree circumferential aperture manifold around an observation scene, and the omnibearing scattering characteristic of an observation target can be acquired. In addition, the increase of the observation angle (azimuth accumulation angle) widens the target azimuth spectrum, so that the CSAR can acquire an image resolution far superior to LSAR in theory.
Terrain relief has a non-negligible impact on SAR imaging, especially high frequency high precision CSAR imaging. At present, influence caused by relief of the terrain is reduced mainly by means of digital terrain elevation (Digital Elevation Model, DEM) data of an observation area acquired by other means at home and abroad. In addition, from the published airborne CSAR imaging test and measured data processing results at home and abroad, most of selected test observation scenes are flat areas with small fluctuation of the topography, so that the influence of the topography fluctuation on CSAR imaging is reduced to a certain extent. But have limitations in the area of observational relief of the terrain based on these data. Therefore, in order to expand the practical range of CSAR, effective methods must be studied to solve the CSAR imaging problem in high topography relief areas.
Through the analysis, the problems and defects of the prior art are that an algorithm researched based on the digital topography elevation data of an observation area in the prior art has a limitation in the observation area with severe topography fluctuation.
The method for solving the problems and the defects is that under the assistance of no digital elevation data, the conventional CSAR imaging technology mainly adopts a method for estimating the elevation of the terrain of an observed scene, so that the influence of the fluctuation error of the terrain is reduced. However, performing elevation estimation based on the CSAR system not only brings a large amount of additional calculation amount, but also has limited estimation accuracy and limited capability of reducing fluctuation influence.
The CSAR imaging problem of the high-terrain fluctuation area can be solved, and the practical range of the CSAR is expanded.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a circumferential synthetic aperture radar imaging method and system, equipment, medium and terminal, and particularly relates to a circumferential synthetic aperture radar imaging method and system based on multilayer focusing, equipment, medium and terminal.
The invention is realized in that a circumferential synthetic aperture radar imaging method comprises the following steps:
the method comprises the steps of carrying out aperture segmentation on complete CSAR data, respectively imaging sub-aperture data by combining the data by adopting a rapid algorithm to obtain sub-images, registering by taking partial images positioned on different elevation planes in the sub-aperture images as references to obtain a group of CSAR images with different depth of field, and finally carrying out multi-focus fusion on the obtained images with different depth of field to obtain a full-focus image.
Further, the circumferential synthetic aperture radar imaging method comprises the following steps:
dividing sub-aperture data according to CSAR system parameters, imaging geometry and image resolution;
step two, sub-aperture imaging is carried out on sub-aperture data by adopting a high-resolution rapid imaging algorithm;
step three, directly accumulating the sub-aperture images to obtain an original CSAR image, and selecting a 'focus' area;
registering according to the selected focus area to obtain a multi-focus depth CSAR image;
and fifthly, carrying out fusion processing on the CSAR images with the multiple focusing depths to obtain a final imaging result.
Further, in the first step, the complete circumferential aperture data is equally divided into N sub-aperture data according to the observation azimuth according to the CSAR system parameters, the imaging geometry and the required image resolution.
In the second step, the sub-aperture data is imaged by adopting a high-resolution rapid imaging algorithm, so that N corresponding sub-images are obtained.
In the third step, the sub-images are directly accumulated, a CSAR imaging result using the reference plane as the depth of field is obtained, and M unfocused local areas in the images are selected as focuses.
In the fourth step, the selected local area focus is used as an image matching reference, and registration fusion processing is performed on the sub-images to obtain M CSAR imaging results with different focus depths.
In the fifth step, the CSAR images with different focusing depths are fused to obtain a full-focus imaging result.
Another object of the present invention is to provide a circumferential synthetic aperture radar imaging system to which the circumferential synthetic aperture radar imaging method is applied, the circumferential synthetic aperture radar imaging system comprising:
the circumference aperture data dividing module is used for dividing the complete circumference aperture data into N sub-aperture data according to the observation azimuth angle according to the CSAR system parameters, the imaging geometry and the required image resolution;
The aperture data imaging processing module is used for carrying out imaging processing on the sub-aperture data by adopting a high-resolution rapid imaging algorithm to obtain N corresponding sub-images;
the sub-image accumulation module is used for directly accumulating the sub-images, acquiring a CSAR imaging result taking a reference plane as a depth of field, and selecting M unfocused local areas in the images as focuses;
the registration fusion processing module is used for carrying out registration fusion processing on the sub-images by taking the selected local area focus as an image matching reference to obtain M CSAR imaging results with different focus depths;
and the full-focus imaging result acquisition module is used for carrying out fusion processing on CSAR images with different focusing depths to acquire a full-focus imaging result.
It is a further object of the present invention to provide a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
Dividing the complete circumference aperture data into N sub-aperture data according to the CSAR system parameters, imaging geometry and required image resolution, adopting a high-resolution rapid imaging algorithm to image the sub-aperture data to obtain corresponding N sub-images, directly accumulating the sub-images to obtain a CSAR imaging result taking a reference plane as a depth of field, and selecting M unfocused local areas in the image as focuses;
the method comprises the steps of taking a selected local area focus as an image matching reference, carrying out registration fusion processing on sub-images to obtain M CSAR imaging results with different focus depths, and carrying out fusion processing on the CSAR images with different focus depths to obtain a full focus imaging result.
Another object of the present invention is to provide a computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
Dividing the complete circumference aperture data into N sub-aperture data according to the CSAR system parameters, imaging geometry and required image resolution, adopting a high-resolution rapid imaging algorithm to image the sub-aperture data to obtain corresponding N sub-images, directly accumulating the sub-images to obtain a CSAR imaging result taking a reference plane as a depth of field, and selecting M unfocused local areas in the image as focuses;
the method comprises the steps of taking a selected local area focus as an image matching reference, carrying out registration fusion processing on sub-images to obtain M CSAR imaging results with different focus depths, and carrying out fusion processing on the CSAR images with different focus depths to obtain a full focus imaging result.
Another object of the present invention is to provide an information data processing terminal for implementing the circumferential synthetic aperture radar imaging system.
The circumferential synthetic aperture radar imaging method provided by the invention is suitable for CSAR imaging in a relief area, and by using the principle of optical image multi-focus fusion imaging, a group of images with different focus depths are acquired by registering sub-images and then the group of images are fused to acquire a full-focus image, so that the problem of image focusing under the condition of no external elevation auxiliary data is solved, and a high-quality CSAR two-dimensional imaging result is acquired. The invention not only reduces local area defocusing caused by elevation errors in CSAR two-dimensional imaging, but also is convenient to use, and only performs one-time imaging processing, thereby obtaining a plurality of CSAR images with different focusing depths and reducing the calculated amount of an algorithm. Meanwhile, the method is verified through actually measured radar echo data, and experimental results prove that the method is effective.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a circumferential synthetic aperture radar imaging method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a circumferential synthetic aperture radar imaging method according to an embodiment of the present invention.
Fig. 3 is a block diagram of a circumferential synthetic aperture radar imaging system according to an embodiment of the present invention.
Fig. 4a and 4b are CSAR images of different depths of focus provided by embodiments of the present invention.
Fig. 5 is a schematic diagram of a CSAR image result obtained after fusion by the proposed algorithm according to an embodiment of the present invention.
In the figure, 1, a circumferential aperture data dividing module; the system comprises an aperture data imaging processing module, a sub-image accumulation module, a registration fusion processing module and a full-focus imaging result acquisition module.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides a circumferential synthetic aperture radar imaging method, a circumferential synthetic aperture radar imaging system, a circumferential synthetic aperture radar imaging equipment, a circumferential synthetic aperture radar imaging medium and a circumferential synthetic aperture radar terminal, the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the circumferential synthetic aperture radar imaging method provided by the embodiment of the invention includes the following steps:
S101, dividing sub-aperture data according to CSAR system parameters, imaging geometry and image resolution;
S102, sub-aperture imaging is carried out on sub-aperture data by adopting a high-resolution rapid imaging algorithm;
s103, directly accumulating the sub-aperture images to obtain an original CSAR image, and selecting a 'focus' area;
S104, registering according to the selected focus area to obtain a multi-focus depth CSAR image;
S105, fusion processing is carried out on the CSAR images with the multiple focusing depths, and a final imaging result is obtained.
The schematic diagram of the circumferential synthetic aperture radar imaging method provided by the embodiment of the invention is shown in figure 2.
As shown in fig. 3, a circumferential synthetic aperture radar imaging system provided in an embodiment of the present invention includes:
the circumference aperture data dividing module 1 is used for dividing the complete circumference aperture data into N sub-aperture data according to the CSAR system parameters, the imaging geometry and the required image resolution;
The aperture data imaging processing module 2 is used for carrying out imaging processing on the sub-aperture data by adopting a high-resolution rapid imaging algorithm to obtain N corresponding sub-images;
The sub-image accumulation module 3 is used for directly accumulating the sub-images, obtaining a CSAR imaging result taking a reference plane as a depth of field, and selecting M unfocused local areas in the images as focuses;
The registration fusion processing module 4 is used for carrying out registration fusion processing on the sub-images by taking the selected local area focus as an image matching reference to obtain M CSAR imaging results with different focus depths;
and the full-focus imaging result acquisition module 5 is used for carrying out fusion processing on CSAR images with different focusing depths to acquire a full-focus imaging result.
The technical scheme of the invention is further described below with reference to specific embodiments.
Example 1
The invention provides a CSAR imaging method suitable for a relief area of a terrain, which uses the principle of optical image multi-focus fusion imaging to utilize a local plane as a focus, acquires a group of images with different focus depths through sub-image registration, and acquires a full-focus image through fusion of the group of images, thereby solving the problem of image focusing under the condition of no external elevation auxiliary data and acquiring a high-quality CSAR two-dimensional imaging result.
The method comprises the basic ideas of firstly carrying out aperture segmentation on complete CSAR data, respectively imaging sub-aperture data by adopting a rapid algorithm in combination with the data to obtain sub-images, then registering by taking local images positioned on different elevation planes in the sub-aperture images as references to obtain a group of CSAR images with different depth of field, and finally carrying out multi-focus fusion on the obtained images with different depth of field to obtain a full-focus image.
The invention provides a circumferential synthetic aperture radar imaging method based on multilayer focusing, which comprises the following processing steps:
Dividing the complete circumference aperture data into N sub-aperture data according to the observation azimuth according to CSAR system parameters, imaging geometry and required image resolution;
secondly, imaging the sub-aperture data by adopting a high-resolution rapid imaging algorithm to obtain N corresponding sub-images;
thirdly, directly accumulating the sub-images to obtain a CSAR imaging result taking a reference plane as a depth of field, and selecting M unfocused local areas in the images as focuses;
Fourth, taking the selected local area focus as an image matching reference, and carrying out registration fusion processing on the sub-images to obtain M CSAR imaging results with different focus depths;
And fifthly, carrying out fusion processing on CSAR images with different focusing depths to obtain a full-focus imaging result.
The method is suitable for two-dimensional high-resolution imaging of the circumference synthetic aperture radar under the assistance of no digital elevation data, not only reduces local area defocusing caused by elevation errors in CSAR two-dimensional imaging, but also is convenient to use, only performs one-time imaging processing, acquires a plurality of CSAR images with different focusing depths, and reduces the calculated amount of an algorithm.
Example 2
Fig. 2 is a flow chart of the present invention. The radio frequency interference signal suppression method based on the adaptive alternating sparse reconstruction provided by the embodiment of the invention comprises the following steps:
The method comprises the steps of firstly, dividing sub-aperture data according to CSAR system parameters, imaging geometry and required image resolution, secondly, carrying out sub-aperture imaging on the sub-aperture data by adopting a high-resolution rapid imaging algorithm, thirdly, directly accumulating sub-aperture images to obtain original CSAR images, selecting focus areas, fourthly, registering according to the selected focus areas to obtain CSAR images with multiple focus depths, and fifthly, carrying out fusion processing on the CSAR images with the multiple focus depths to obtain a final imaging result.
The method is verified through actually measured radar echo data, and experimental results prove that the method is effective.
Fig. 4 is a schematic diagram of the operation of the test radar system. And (3) carrying out image matching processing on the L-band CSAR sub-aperture image of a certain town area by taking local different height planes as focusing centers. Where fig. 4 (a) is a matching result obtained with the a region as the "focus" plane, and fig. 4 (B) is a matching result obtained with the B region as the "focus" plane. When both images are observed, both the upper and lower images are well focused in the vicinity of the respective "focal" plane, while the regions having a greater difference in height from the "focal" plane are severely defocused.
Fig. 5 is a CSAR image obtained after multi-layer focus fusion using the proposed method. The method has the advantages that the effective focusing is obtained after the original image defocusing areas are fused, the defocusing problem of the local area caused by inconsistent image topography fluctuation is effectively corrected, and the method has a good inhibition effect on defocusing caused by imaging topography fluctuation without elevation data.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When used in whole or in part, is implemented in the form of a computer program product comprising one or more computer instructions. When loaded or executed on a computer, produces a flow or function in accordance with embodiments of the present invention, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk Solid STATE DISK (SSD)), etc.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
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