CN113671501B - Direction simulation correction method and device based on ISAR imaging - Google Patents
Direction simulation correction method and device based on ISAR imaging Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 33
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- 238000004364 calculation method Methods 0.000 claims description 11
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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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- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses an ISAR imaging-based azimuth simulation correction method and device, comprising the following steps: acquiring target ship model echo information fed back by a radar on a ship of the 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 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the self ship; rotating the self ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self ship carries the radar. Compared with the prior art, the correction means has the advantages of strong practicability, simple algorithm, small calculated amount and high resolution, performance data are obtained through simulation for reference and verification, the design efficiency is greatly improved, the cost is saved, and the azimuth direction is kept at very high precision no matter how the incident angle changes.
Description
Technical Field
The invention relates to the field of Inverse Synthetic Aperture Radar (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, positioning and measuring the distance between targets. 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, etc. of the target. Generalized synthetic aperture radar technologies include synthetic aperture radar imaging (SAR) and inverse synthetic aperture radar technology (ISAR). Inverse Synthetic Aperture Radar (ISAR) is a microwave imaging technology, and can realize the whole-day, all-weather and long-distance two-dimensional imaging of targets such as airplanes, ships and even celestial bodies. The technology mainly relies on the relative rotation relation between the ship and the radar to obtain images, and the ship moves slowly, so that the movement mainly consists of rotation generated by the self-swinging (such as rolling, pitching and yawing) of the ship under the action of sea waves when the ship is sailing, and the ship movement condition becomes very complex due to the complex and changeable sea conditions, so that the technical scheme of high azimuth precision, high resolution and simple algorithm is very difficult to obtain.
Disclosure of Invention
The embodiment of the invention provides an ISAR imaging-based azimuth simulation correction method and an ISAR imaging-based azimuth simulation correction device, which are used for solving the technical problems of reduced incidence angle and reduced azimuth precision.
In order to solve the above technical problems, 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 of the ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging when HH is polarized;
when the azimuth angle is 0 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the self ship; the rotation angle of the self ship is the complementary angle of the incidence angle;
rotating the self ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self ship carries the radar.
Further, the generating, according to the echo information, an incident angle and an azimuth angle corresponding to the target ship model specifically includes:
according to the echo information, the center of the self ship is taken as an origin O, the direction of the ship head of the self ship is an X-axis forward direction, the direction of the ship direction of the self ship is a Z-axis forward direction, a right-hand coordinate system is established, and the incidence angle and the azimuth angle are obtained through calculation of the relative positions of the target ship model and the ship of 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 self ship rotates on the XOZ plane by taking the anticlockwise direction of the X axis around the Y axis as the rotation direction.
Further, the incident angle is a horizontal included angle on the XOZ plane, which is rotated anticlockwise around the Y axis to a target azimuth line from the positive direction of the Z axis; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X axis.
Further, after generating the incident angle and the azimuth corresponding to the target ship model according to the echo information, the method further comprises: 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 following components: the device comprises an acquisition module, a calculation module and a rotation module; wherein,,
the acquisition module is used for acquiring echo information of a target ship model fed back by the radar on the ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; ISAR imaging when the echo information of the target ship model is HH polarization;
the calculation module is used for calculating the rotation angle of the self ship when the azimuth angle is 0 DEG and the incident angle is not 90 DEG; the rotation angle of the self ship is the complementary angle of the incidence angle;
the rotation module is used for rotating the ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self ship carries the radar.
Further, the acquiring module is configured to generate, according to the echo information, an incident angle and an azimuth angle corresponding to the target ship model, specifically:
the acquisition module establishes a right-hand coordinate system according to the echo information, the center of the ship is taken as an origin O, the direction of the ship head of the ship is an X-axis forward direction, the direction of the ship is a Z-axis forward direction, and the incidence angle and the azimuth angle are obtained through calculation of the relative positions of the target ship model and the ship on the right-hand coordinate system.
Further, the rotation module is used for rotating the self ship according to the rotation angle, specifically: and the rotating module enables the ship to rotate on the XOZ plane by taking the anticlockwise direction of the X axis around the Y axis as the rotating direction according to the rotation angle.
Further, the incident angle is a horizontal included angle on the XOZ plane, which is rotated anticlockwise around the Y axis to a target azimuth line from the positive direction of the Z axis; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X axis.
Further, after generating the incident angle and the azimuth corresponding to the target ship model according to the echo information, the method further comprises: 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 acquiring echo information of a target ship model fed back by a radar on a ship of the method, 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 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the ship; and rotating the self ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model. Compared with the prior art, the correction means has the advantages of strong practicability, simple algorithm, small calculated amount and high resolution, performance data are obtained through simulation for reference and verification, the design efficiency is greatly improved, the cost is saved, and the azimuth direction is kept at very high precision no matter how the incident angle changes.
Drawings
Fig. 1: an embodiment of the invention is provided for an ISAR imaging-based azimuth simulation correction method.
Fig. 2: a specific example of one embodiment provided for the ISAR imaging-based azimuthal simulation correction method of the present invention.
Fig. 3: a schematic structural diagram of one embodiment of the present invention is provided for an ISAR imaging-based azimuth-based simulation correction device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to fig. 1, fig. 1 is a schematic diagram of an ISAR imaging-based azimuth simulation correction method according to an embodiment of the present invention, including steps 101 to 103, where the steps are as follows:
step 101, acquiring target ship model echo information fed back by a ship radar of the target ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging when HH is polarized.
In this embodiment, the generating, according to the echo information, an incident angle and an azimuth angle corresponding to the target ship model specifically includes:
according to the echo information, the center of the self ship is taken as an origin O, the direction of the ship head of the self ship is an X-axis forward direction, the direction of the ship direction of the self ship is a Z-axis forward direction, a right-hand coordinate system is established, and the incidence angle and the azimuth angle are obtained through calculation of the relative positions of the target ship model and the ship of the self ship on the right-hand coordinate system.
In this embodiment, the incident angle is a horizontal angle on the XOZ plane, starting with the positive direction of the Z axis, rotating counterclockwise around the Y axis to the target azimuth line; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X axis.
102, when the azimuth angle is 0 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the ship; the rotation angle of the ship is the complementary angle of the incidence angle.
In this 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 itself. 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 the incident angle and the 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.
Step 103, rotating the self ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self 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 self ship rotates on the XOZ plane by taking the anticlockwise direction of the X axis around the Y axis as the rotation direction.
In this embodiment, a CST software suite is used as the simulation software. The CST software suite contains several workings 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 bouncing ray algorithm is adopted.
As shown in fig. 2, taking a ship as an example, taking the ship's head as the positive direction of the X axis, the positive direction of the Z axis as the positive direction of the sky direction, and the center as the origin O, a right-hand coordinate system is established. According to the simulation, when the incidence angle theta=90°, the azimuth angle phi=0°, and the incident wave HH polarized ISAR imaging, the azimuth direction of which coincides with the ship's board width, the result obtained by the algorithm is still accurate when theta=90°, and as the Theta angle becomes smaller, the azimuth direction becomes significantly smaller, and the accuracy of the result obtained by the algorithm cannot be ensured. In the present embodiment, when the incident angle Theta is 10 deg., the rotation angle, that is, the complementary angle of the incident angle is 80 deg. (also the ground wiping angle), it can be derived from the results of the above simulation that the results are accurate at the incident angle theta=90 deg.. Therefore, in the bouncing ray algorithm, the incident angle Theta is set to 90 °, and in order to obtain a result that the incident angle theta=10°, the self ship is rotated on the XOZ plane in the X-axis forward direction around the Y-axis counterclockwise direction according to the rotation angle size, that is, 80 °. (in software, the warship head is in the X-axis forward direction, the vertical direction is in the Z-axis forward direction, and the ship rotates on the XOZ plane and rotates anticlockwise around the Y axis from the X-axis forward direction). 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 figure 2B). Similarly, to obtain a result when the incident angle theta=20°, it is necessary to rotate the own ship by 70 °; to obtain the result when the incident angle theta=30°, it is necessary to rotate the own ship by 60 °. In CST, when calculating ISAR imaging, when the algorithm sets the angle of incidence Theta to the corresponding angle, ISAR imaging results at that angle can be calculated, and simulation of this embodiment states that the results obtained when the angle of incidence theta=90°, the azimuth phi=0°, are accurate. If the incident angle Theta is not 90 deg., a lateral distortion occurs as a result when the azimuth Phi is 0 deg.. At this time, the ship itself is rotated correspondingly, that is, the simulation result is still accurate when phi=0°. The target ship model and the self ship adopted in the embodiment are both physically constructed, and the model in the simulation is constructed according to the real size of the entity. Radar is a remote electronic detection device, while ISAR imaging refers to imaging a remote target by radar to better monitor target distance, target type, etc. There is no problem why the known parameters are 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 acquiring echo information of a target ship model fed back by a radar on a ship of the method, 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 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the ship; and rotating the target ship model according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model. Compared with the prior art, the correction means has the advantages of strong practicability, simple algorithm, small calculated amount and high resolution, performance data are obtained through simulation for reference and verification, the design efficiency is greatly improved, the cost is saved, and the azimuth direction is kept at very high precision no matter how the incident angle changes.
Embodiment two:
referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of an azimuth simulation correction device based on 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 acquisition module 201 is configured to acquire echo information of a target ship model fed back by a radar on a ship of the acquisition module, 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 when HH is polarized;
in this embodiment, the obtaining module 201 uses the center of the own ship as the origin O according to the echo information, the direction of the ship's warhead of the own ship is the positive direction of the X axis, the direction of the ship's warship is the positive direction of the Z axis, establishes a right-hand coordinate system, and calculates the incident angle and the azimuth angle through the relative positions of the target ship model and the ship's warship on the right-hand coordinate system.
In this embodiment, the incident angle is a horizontal angle on the XOZ plane, starting with the positive direction of the Z axis, rotating counterclockwise around the Y axis to the target azimuth line; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X 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 °; the rotation angle of the ship is the complementary angle of the incidence angle;
in this 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 itself. 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 the incident angle and the 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 an azimuth of an ISAR imaging of the target ship model is corrected; the self ship carries the radar.
In this embodiment, the rotation module 203 rotates the self ship according to the rotation angle, specifically: the rotation module 203 rotates the self ship on the XOZ plane according to the rotation angle, and takes the anticlockwise direction around the Y axis as the rotation direction.
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 acquiring echo information of a target ship model fed back by a radar on a ship of the method, 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 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the ship; and rotating the target ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model. Compared with the prior art, the correction means has the advantages of strong practicability, simple algorithm, small calculated amount and high resolution, performance data are obtained through simulation for reference and verification, the design efficiency is greatly improved, the cost is saved, and the azimuth direction is kept at very high precision no matter how the incident angle changes.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. An ISAR imaging-based azimuth simulation correction method is characterized by comprising the following steps:
acquiring target ship model echo information fed back by a radar on a ship of the ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; the echo information is ISAR imaging when HH is polarized;
when the azimuth angle is 0 DEG and the incident angle is not 90 DEG, calculating the rotation angle of the self ship; the rotation angle of the self ship is the complementary angle of the incidence angle;
rotating the self ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self ship carries the radar;
generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information, wherein the incidence angle and the azimuth angle are specifically as follows:
according to the echo information, the center of the self ship is taken as an original point O, the direction of the ship head of the self ship is an X-axis forward direction, the direction of the ship direction of the self ship is a Z-axis forward direction, a right-hand coordinate system is established, and the incidence angle and the azimuth angle are obtained through calculation of the relative positions of a target ship model and the ship of the self ship on the right-hand coordinate system;
the self ship is rotated according to the rotation angle, specifically: according to the rotation angle, the self ship rotates on the XOZ plane by taking the anticlockwise direction of the X axis around the Y axis as the rotation direction;
the incidence angle is a horizontal included angle on the XOZ plane from the positive direction of the Z axis and rotating anticlockwise around the Y axis to a target azimuth line; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X axis.
2. The ISAR imaging-based azimuth simulation correction method according to claim 1, further comprising, after generating an incident angle and an azimuth angle corresponding to the target ship model from the echo information: when the azimuth angle is not 0 ° or when the incident angle is 90 °, no operation is performed.
3. An ISAR imaging-based azimuth simulation correction device is characterized by comprising an acquisition module, a calculation module and a rotation module; wherein,,
the acquisition module is used for acquiring echo information of a target ship model fed back by the radar on the ship, and generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information; ISAR imaging when the echo information of the target ship model is HH polarization;
the calculation module is used for calculating the rotation angle of the self ship when the azimuth angle is 0 DEG and the incident angle is not 90 DEG; the rotation angle of the self ship is the complementary angle of the incidence angle;
the rotation module is used for rotating the ship according to the rotation angle so as to correct the azimuth of ISAR imaging of the target ship model; the self ship carries the radar;
the acquisition module is used for generating an incidence angle and an azimuth angle corresponding to the target ship model according to the echo information, and specifically comprises the following steps:
the acquisition module establishes a right-hand coordinate system according to the echo information, takes the center of the self ship as an origin O, the direction of the ship head of the self ship as an X-axis forward direction, and the direction of the ship head of the self ship as a Z-axis forward direction, and calculates and acquires the incident angle and the azimuth angle through the relative positions of a target ship model and the ship of the self ship in the right-hand coordinate system;
the rotation module is used for rotating the self ship according to the rotation angle, and specifically comprises the following steps: the rotating module enables the ship to rotate on the XOZ plane by taking the anticlockwise direction of the X axis around the Y axis as the rotating direction according to the rotation angle;
the incidence angle is a horizontal included angle on the XOZ plane from the positive direction of the Z axis and rotating anticlockwise around the Y axis to a target azimuth line; the azimuth angle is a horizontal included angle on the XOY plane, which rotates anticlockwise around the Z axis to the target azimuth line from the positive direction of the X axis.
4. The ISAR imaging-based azimuth simulation correction device according to claim 3, further comprising, after generating an incident angle and an azimuth angle corresponding to the target ship model from 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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