CN113671501A - Orientation simulation correction method and device based on ISAR imaging - Google Patents
Orientation simulation correction method and device based on ISAR imaging Download PDFInfo
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- CN113671501A CN113671501A CN202110927252.9A CN202110927252A CN113671501A CN 113671501 A CN113671501 A CN 113671501A CN 202110927252 A CN202110927252 A CN 202110927252A CN 113671501 A CN113671501 A CN 113671501A
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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
- G01S13/9064—Inverse SAR [ISAR]
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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
- G01S13/9004—SAR image acquisition techniques
- G01S13/9017—SAR image acquisition techniques with time domain processing of the SAR signals in azimuth
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Abstract
The invention discloses an azimuth simulation correction method and device based on ISAR imaging, comprising the following steps: acquiring target ship model echo information fed back by a radar on a ship, and generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information; when the azimuth angle is 0 degrees and the incidence angle is not 90 degrees, calculating the rotation angle of the ship; rotating the self ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model; the own ship carries the radar. Compared with the prior art, the correction method is high in practicability, simple in algorithm, small in calculation amount and high in resolution, performance data obtained through simulation are referenced and verified, design efficiency is greatly improved, cost is saved, and the azimuth direction keeps a very high precision no matter how the incident angle changes.
Description
Technical Field
The invention relates to the field of Inverse Synthetic Aperture Radars (ISAR), in particular to an azimuth simulation correction method and device based on ISAR imaging.
Background
The existing radar technology is mainly used for detecting, finding and positioning targets and measuring target distances. With the development of information technology, people are no longer satisfied with obtaining only position and distance information, and people also want to obtain an image of a target from echo information for analyzing the type, model, and the like of the target. Generalized synthetic aperture radar techniques include synthetic aperture radar imaging (SAR) and inverse synthetic aperture radar techniques (ISAR). Inverse Synthetic Aperture Radar (ISAR) is a microwave imaging technology, and can realize two-dimensional imaging of targets such as airplanes, ships, even celestial bodies and the like in all-time, all-weather and long distance. The technology mainly depends on the relative rotation relation between the ship and the radar to obtain images, and the ship moves slowly, so the movement mainly comprises rotation generated by the self-swinging (such as rolling, pitching and yawing) of the ship under the action of sea waves when the ship sails, and the ship movement situation becomes very complicated due to the complex and changeable sea conditions, so that the technical scheme with high azimuth precision, high resolution and simple algorithm is difficult to obtain.
Disclosure of Invention
The embodiment of the invention provides an azimuth simulation correction method and device based on ISAR imaging, and aims to solve the technical problems of reduction of an incident angle and reduction of azimuth precision.
In order to solve the above technical problem, an embodiment of the present invention provides an azimuth simulation correction method based on ISAR imaging, including:
acquiring target ship model echo information fed back by a radar on a ship, and generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging in HH polarization;
when the azimuth angle is 0 degrees and the incidence angle is not 90 degrees, calculating the rotation angle of the ship; wherein the rotation angle of the own ship is a complementary angle of the incident angle;
rotating the self ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model; the own ship carries the radar.
Further, the generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information specifically includes:
and according to the echo information, taking the center of the self ship as an origin O, the heading direction of the self ship as an X-axis forward direction, and the zenith direction of the self ship as a Z-axis forward direction, establishing a right-hand coordinate system, and calculating and obtaining the incident angle and the azimuth angle according to the relative positions of a target ship model and the self ship on the right-hand coordinate system.
Further, the rotating the target ship model according to the rotation angle specifically includes: and according to the rotation angle, the ship rotates on the XOZ plane by taking the X-axis forward direction around the Y-axis anticlockwise direction as a rotation direction.
Further, the incident angle is a horizontal included angle on an XOZ plane from the positive direction of the Z axis and rotates anticlockwise to a target azimuth line around the Y axis; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
Further, after generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, the method further includes: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
Correspondingly, the embodiment of the invention also provides an azimuth simulation correction device based on ISAR imaging, which comprises: the device comprises an acquisition module, a calculation module and a rotation module; wherein the content of the first and second substances,
the acquisition module is used for acquiring target ship model echo information fed back by a radar on a ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information of the target ship model is ISAR imaging in HH polarization;
the calculation module is used for calculating the rotation angle of the ship when the azimuth angle is 0 degrees and the incidence angle is not 90 degrees; wherein the rotation angle of the own ship is a complementary angle of the incident angle;
the rotation module is used for rotating the ship according to the rotation angle so as to correct the azimuth direction of ISAR imaging of the target ship model; the own ship carries the radar.
Further, the obtaining module is configured to generate an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, specifically:
the acquisition module takes the center of the ship as an origin O, the bow direction of the ship as an X-axis forward direction and the skyward direction of the ship as a Z-axis forward direction according to the echo information, establishes a right-hand coordinate system, and calculates and obtains the incident angle and the azimuth angle according to the relative positions of a target ship model and the ship on the right-hand coordinate system.
Further, the rotation module is configured to rotate the ship according to the rotation angle, specifically: and the rotation module enables the ship to rotate on an XOZ plane in a direction of rotating around a Y axis in the positive direction of an X axis and in a counterclockwise direction according to the rotation angle.
Further, the incident angle is a horizontal included angle on an XOZ plane from the positive direction of the Z axis and rotates anticlockwise to a target azimuth line around the Y axis; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
Further, after generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, the method further includes: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
Compared with the prior art, the azimuth simulation correction method and device based on ISAR imaging provided by the embodiment of the invention have the following beneficial effects:
the method comprises the steps of obtaining echo information of a target ship model fed back by a radar on a ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; when the azimuth angle is 0 degrees and the incident angle is not 90 degrees, calculating the rotation angle of the ship; and rotating the self ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model. Compared with the prior art, the correction method is high in practicability, simple in algorithm, small in calculation amount and high in resolution, performance data obtained through simulation are referenced and verified, design efficiency is greatly improved, cost is saved, and the azimuth direction keeps a very high precision no matter how the incident angle changes.
Drawings
FIG. 1: the invention provides an embodiment of an orientation simulation correction method based on ISAR imaging.
FIG. 2: the invention provides a specific example of an embodiment of the azimuth simulation correction method based on ISAR imaging.
FIG. 3: the invention provides a structural schematic diagram of an embodiment of an azimuth simulation correction device based on ISAR imaging.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a schematic diagram of an azimuth simulation correction method based on ISAR imaging according to an embodiment of the present invention, which includes steps 101 to 103, and each step specifically includes the following steps:
In this embodiment, the generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information specifically includes:
and according to the echo information, taking the center of the self ship as an origin O, the heading direction of the self ship as an X-axis forward direction, and the zenith direction of the self ship as a Z-axis forward direction, establishing a right-hand coordinate system, and calculating and obtaining the incident angle and the azimuth angle according to the relative positions of a target ship model and the self ship on the right-hand coordinate system.
In this embodiment, the incident angle is a horizontal included angle on the XOZ plane from the positive direction of the Z axis and rotating counterclockwise around the Y axis to the target azimuth line; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
In the embodiment, when the azimuth angle is 0 °, the correction result can ensure that the azimuth direction of the ISAR imaging is consistent with the board width of the ship. When the incident angle is not 90 ° or when the azimuth angle is not 0 °, lateral distortion occurs if the simulation correction operation is not performed.
In this embodiment, after generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, the method further includes: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
103, rotating the self ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model; the own ship carries the radar.
In this embodiment, the rotating the self ship according to the rotation angle specifically includes: and according to the rotation angle, the ship rotates on the XOZ plane by taking the X-axis forward direction around the Y-axis anticlockwise direction as a rotation direction.
In this embodiment, a CST software suite is employed as the simulation software. The CST software suite contains multiple jobs that can accomplish different levels of electromagnetic compatibility (EMC) issues, such as chip level, PCB level, complex cable bundles, system level, and product level. In the simulation process, a high-frequency progressive solver based on CST is used for calculation, and a bounce ray algorithm is adopted.
As shown in fig. 2, a right-hand coordinate system is established with a certain ship as an example, with the bow as the X-axis forward direction, the sky direction as the Z-axis forward direction, and the center as the origin O. According to the simulation, when the incident angle Theta is 90 ° and the azimuth angle Phi is 0 °, ISAR imaging when the incident wave is HH polarized is performed, and the azimuth direction thereof coincides with the side width of the ship, so that the result obtained by the algorithm is still accurate when the angle Theta is 90 °, and the azimuth direction is significantly reduced as the angle Theta is gradually reduced, and the accuracy of the result obtained by the algorithm cannot be ensured. In the present embodiment, when the incident angle Theta is 10 °, the rotation angle, that is, the complementary angle of the incident angle is 80 ° (also, the wiping angle), it can be derived from the above simulation result that the result is accurate when the incident angle Theta is 90 °. Therefore, in the bounce ray algorithm, the incidence angle Theta is set to 90 °, and the self ship is rotated counterclockwise around the Y axis in the positive X axis direction on the XOZ plane according to the rotation angle size, that is, 80 ° in order to obtain the result that the incidence angle Theta is 10 °. (in software, the ship head is in the positive direction of an X axis, the heaven direction is in the positive direction of a Z axis, and the ship rotates on an XOZ plane in the positive direction of the X axis and rotates anticlockwise around the Y axis). The ground wiping angle is ensured to be unchanged, and the simulation result is consistent with the result when the incident angle Theta is 90 degrees. (as shown in the B diagram in FIG. 2). Similarly, in order to obtain the result when the incident angle Theta is 20 °, the ship needs to be rotated by 70 °; to obtain the result when the angle of incidence Theta is 30 deg., the vessel itself needs to be rotated by 60 deg.. In CST, when calculating ISAR imaging, the algorithm sets the incident angle Theta as a corresponding angle, and the ISAR imaging result at the angle can be calculated, and the simulation of the present embodiment states that when the incident angle Theta is 90 °, the result obtained when the azimuth angle Phi is 0 ° is accurate. If the angle of incidence Theta is not 90 deg., at an azimuth angle Phi of 0 deg., lateral distortion will result. At this time, the ship is correspondingly rotated, namely, the simulation result is still accurate when Phi is equal to 0 degrees. The target ship model and the ship are both physically constructed, and the model in simulation is constructed according to the actual size of the entity. Radar is a long-distance electronic detection device, and ISAR imaging refers to imaging a long-distance target by radar so as to better monitor the target distance, the target type and the like. There is therefore no known parameter why this problem is still measured.
Compared with the prior art, the azimuth simulation correction method based on ISAR imaging provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining echo information of a target ship model fed back by a radar on a ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; when the azimuth angle is 0 degrees and the incident angle is not 90 degrees, calculating the rotation angle of the ship; and rotating the target ship model according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model. Compared with the prior art, the correction method is high in practicability, simple in algorithm, small in calculation amount and high in resolution, performance data obtained through simulation are referenced and verified, design efficiency is greatly improved, cost is saved, and the azimuth direction keeps a very high precision no matter how the incident angle changes.
Example two:
referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment provided to a simulation correction device based on an orientation of ISAR imaging. As shown in fig. 3, the apparatus includes: an acquisition module 201, a calculation module 202 and a rotation module 203. Wherein the content of the first and second substances,
the acquisition module 201 is configured to acquire echo information of a target ship model fed back by a radar on a ship, and generate an incident angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging in HH polarization;
in this embodiment, the obtaining module 201 establishes a right-hand coordinate system by using the center of the ship as an origin O, the bow direction of the ship as an X-axis forward direction, and the zenith direction of the ship as a Z-axis forward direction according to the echo information, and obtains the incident angle and the azimuth angle by calculating a relative position of a target ship model and the ship on the right-hand coordinate system.
In this embodiment, the incident angle is a horizontal included angle on the XOZ plane from the positive direction of the Z axis and rotating counterclockwise around the Y axis to the target azimuth line; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
The calculation module 202 is configured to calculate a rotation angle of the ship when the azimuth angle is 0 ° and the incident angle is not 90 °; wherein the rotation angle of the ship is the complementary angle of the incidence angle;
in the embodiment, when the azimuth angle is 0 °, the correction result can ensure that the azimuth direction of the ISAR imaging is consistent with the board width of the ship. When the incident angle is not 90 ° or when the azimuth angle is not 0 °, lateral distortion occurs if the simulation correction operation is not performed.
In this embodiment, after generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, the method further includes: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
The rotation module 203 is configured to rotate the self ship according to the rotation angle, so that the azimuth of the ISAR imaging of the target ship model is corrected; the own ship carries the radar.
In this embodiment, the rotation module 203 rotates the ship according to the rotation angle, specifically: the rotation module 203 rotates the ship on the XOZ plane in the X-axis forward direction around the Y-axis counterclockwise direction as a rotation direction according to the magnitude of the rotation angle.
Compared with the prior art, the azimuth simulation correction device based on ISAR imaging provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining echo information of a target ship model fed back by a radar on a ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; when the azimuth angle is 0 degrees and the incident angle is not 90 degrees, calculating the rotation angle of the ship; and rotating the target ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model. Compared with the prior art, the correction method is high in practicability, simple in algorithm, small in calculation amount and high in resolution, performance data obtained through simulation are referenced and verified, design efficiency is greatly improved, cost is saved, and the azimuth direction keeps a very high precision no matter how the incident angle changes.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (10)
1. An orientation simulation correction method based on ISAR imaging is characterized by comprising the following steps:
acquiring target ship model echo information fed back by a radar on a ship, and generating an incident angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging in HH polarization;
when the azimuth angle is 0 degrees and the incidence angle is not 90 degrees, calculating the rotation angle of the ship; wherein the rotation angle of the own ship is a complementary angle of the incident angle;
rotating the self ship according to the rotation angle so as to correct the azimuth direction of the ISAR imaging of the target ship model; the own ship carries the radar.
2. The ISAR imaging-based azimuth simulation correction method according to claim 1, wherein the generating of the incidence angle and the azimuth angle corresponding to the target ship model according to the echo information comprises:
and according to the echo information, taking the center of the self ship as an origin O, the heading direction of the self ship as an X-axis forward direction, and the zenith direction of the self ship as a Z-axis forward direction, establishing a right-hand coordinate system, and calculating and obtaining the incident angle and the azimuth angle according to the relative positions of a target ship model and the self ship on the right-hand coordinate system.
3. The ISAR imaging-based azimuth simulation correction method according to claim 2, wherein the self ship is rotated according to the rotation angle, specifically: and according to the rotation angle, the ship rotates on the XOZ plane by taking the X-axis forward direction around the Y-axis anticlockwise direction as a rotation direction.
4. The ISAR imaging-based azimuth simulation correction method as claimed in claim 2, wherein the incident angle is a horizontal included angle on an XOZ plane from a positive direction of a Z axis, and from a counterclockwise rotation to a target azimuth line around a Y axis; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
5. The ISAR imaging-based azimuth simulation correction method according to any one of claims 1 to 4, further comprising, after generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
6. An azimuth simulation correction device based on ISAR imaging is characterized by comprising an acquisition module, a calculation module and a rotation module; wherein the content of the first and second substances,
the acquisition module is used for acquiring target ship model echo information fed back by a radar on a ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information of the target ship model is ISAR imaging in HH polarization;
the calculation module is used for calculating the rotation angle of the ship when the azimuth angle is 0 degrees and the incidence angle is not 90 degrees; wherein the rotation angle of the own ship is a complementary angle of the incident angle;
the rotation module is used for rotating the ship according to the rotation angle so as to correct the azimuth direction of ISAR imaging of the target ship model; the own ship carries the radar.
7. The ISAR imaging-based azimuth simulation correction device according to claim 6, wherein the obtaining module is configured to generate an incident angle and an azimuth angle corresponding to the target ship model according to the echo information, specifically:
the acquisition module takes the center of the ship as an origin O, the bow direction of the ship as an X-axis forward direction and the skyward direction of the ship as a Z-axis forward direction according to the echo information, establishes a right-hand coordinate system, and calculates and obtains the incident angle and the azimuth angle according to the relative positions of a target ship model and the ship in the right-hand coordinate system.
8. The ISAR imaging-based azimuth simulation correction device as claimed in claim 7, wherein the rotation module is configured to rotate the self ship according to the rotation angle, specifically: and the rotation module enables the ship to rotate on an XOZ plane in a direction of rotating around a Y axis in the positive direction of an X axis and in a counterclockwise direction according to the rotation angle.
9. The ISAR imaging-based azimuth simulation correction device as claimed in claim 7, wherein the incident angle is a horizontal angle on an XOZ plane from a positive Z-axis, counterclockwise rotation around a Y-axis to a target azimuth line; the azimuth angle is a horizontal included angle on an XOY plane from the positive direction of the X axis and rotates anticlockwise to a target azimuth line around the Z axis.
10. The ISAR imaging-based azimuth simulation correction device according to any of claims 6-9, further comprising, after generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
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