CN113391312A - Overwater target imaging test method for long synthetic aperture time of L-band HH polarization - Google Patents
Overwater target imaging test method for long synthetic aperture time of L-band HH polarization Download PDFInfo
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- CN113391312A CN113391312A CN202110694609.3A CN202110694609A CN113391312A CN 113391312 A CN113391312 A CN 113391312A CN 202110694609 A CN202110694609 A CN 202110694609A CN 113391312 A CN113391312 A CN 113391312A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 30
- 230000010287 polarization Effects 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 239000011358 absorbing material Substances 0.000 claims description 7
- 235000006506 Brasenia schreberi Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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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
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses an overwater target imaging test method of long synthetic aperture time of L-waveband HH polarization, a used test device comprises a microwave darkroom, an L-waveband HH polarization antenna, a target platform, a linear track, a water body container and an overwater target, the test method comprises the following steps of (1) placing the water body container on the target platform, filling the water body container with water, and floating the overwater target on the surface of the water body; (2) initializing and calibrating; (3) enabling the relative displacement generated between the L-band HH polarized antenna and the target platform to form a virtual aperture; (4) an L-band HH polarized antenna transmits and receives an L-band horizontal polarized signal to form a synthesis array; (5) and after the data are acquired, imaging the acquired data through a back projection algorithm. The invention can provide a pure and interference-free overwater target microwave scattering imaging test environment, reduce the influence of the external environment on the microwave scattering characteristics of the overwater target and improve the test precision.
Description
Technical Field
The invention relates to the field of aerospace microwave remote sensing, in particular to an overwater target imaging test method with long synthetic aperture time for L-band HH polarization.
Background
The existing microwave imaging test of the aquatic target is mostly based on the open air and mainly depends on aircrafts such as a satellite, an airplane and an unmanned aerial vehicle to carry microwave radar load for flying, so that the microwave imaging test of the aquatic target generates relative displacement with the aquatic target, the synthesis of a virtual large aperture is formed, and the imaging of the aquatic target is finally realized. The test method has obvious defects which are mainly shown in that: 1. the receiving and transmitting of microwave signals in the flight process can generate Doppler effect, and the Doppler effect needs to be removed through a large amount of calculation in the later imaging; 2. the aircraft is easily interfered by wind force, gravitation and other influence factors, and the difficulty of data calculation and processing at the later stage of the imaging test is increased; 3. the environment of the ground objects around the outdoor open water body is complex, the microwave scattering property of the aquatic target is easily interfered by the scattering of the surrounding ground objects, and the scattering property of the aquatic target can not be completely and truly reflected.
Therefore, it is clear that the above-mentioned existing microwave imaging test method for targets on water still has the inconvenience and defects, and further improvement is needed. How to create a new overwater target test method of long synthetic aperture of L wave band HH polarization belongs to one of the current important research and development subjects.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the aquatic target with the long synthetic aperture of the L-waveband HH polarization, so that a pure and interference-free aquatic target microwave scattering imaging test environment can be constructed, and the defects of the conventional test method are overcome.
In order to solve the technical problems, the invention provides an overwater target imaging test method with long synthetic aperture time of L-waveband HH polarization, a used test device comprises a microwave darkroom, an L-waveband HH polarization antenna, a target platform, a linear track, a water body container and an overwater target, wherein the target platform is a platform with a flat surface and capable of containing objects and is placed in the microwave darkroom, and the water body container has L-waveband weak scattering property; the linear track is arranged in a microwave darkroom, and the L-band HH polarized antenna or the target platform is arranged on the linear track in a sliding manner;
the test procedure was as follows:
(1) placing the water body container on a target platform, wherein the water body container is filled with water bodies, and the aquatic target floats on the surface of the water bodies;
(2) carrying out initialization calibration on the positions of the overwater target and the L-band HH polarized antenna;
(3) setting a plurality of equidistant position points on a linear track, driving an L-band HH polarized antenna or a target platform to slide along the linear track and pass through the position points one by one, and enabling the relative displacement generated between the L-band HH polarized antenna and the target platform to form a virtual aperture;
(4) when the L-band HH polarized antenna or the target platform moves to each position point, the L-band HH polarized antenna transmits and receives L-band horizontal polarized signals to form a synthesis array;
(5) and after the data are acquired, imaging the acquired data through a back projection algorithm.
As a modification of the present invention, the linear track is installed on the top of the microwave darkroom, the L-band HH-polarized antenna is installed on the linear track, the target platform is placed below the linear track, and the L-band HH-polarized antenna slides along the linear track and forms a relative displacement with the target platform.
Furthermore, the water body container is made of an L-band transmission material or a wave-absorbing material.
Furthermore, wave-absorbing materials are covered on the peripheries of the target platform and the water body container.
Further, the L-band HH polarized antenna is a tapered fully polarized antenna.
Further, the microwave dark room is in a hollow cuboid shape, a semi-cylinder shape, a semi-dome shape or a quarter sphere shape.
Further, the distance between the position points on the linear track in the step (4) is 15 mm.
Further, in the step (3), the distance of the relative displacement between the L-band HH polarized antenna and the target platform is 4.56m, the relative displacement is divided into two segments which are symmetrical left and right around the target platform, and the distance of each segment is 2.28 m.
After adopting such design, the invention has at least the following advantages:
1. a pure interference-free overwater target microwave scattering imaging test environment is built by using a microwave darkroom, and the water body and the overwater target are contained in the microwave weak scatterer container, so that the scattering influence of the container on the water body and the overwater target is reduced.
2. The outer surface of the weak scatterer container and the exposed part of the target platform are covered by the wave-absorbing material, so that the interference between the container and the platform is further reduced.
3. The stable water target scattering signal synthesis array is constructed through the receiving and sending of the microwave signals at equidistant fixed points, and the purpose of reliably obtaining high-quality water target SAR image data is achieved.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic structural diagram of the interior of a microwave darkroom in the aquatic target imaging test method with long synthetic aperture time of L-band HH polarization provided by the invention.
FIG. 2 is a schematic cross-sectional structure diagram of a microwave darkroom in the method for testing the imaging of the target on water with long synthetic aperture time and L-band HH polarization provided by the invention.
Description of reference numerals: 1-microwave darkroom; a 2-L band HH polarized antenna; 3-a target platform; 4-a linear track; 5-a water body container; 6-water body; 7-Water target.
Detailed Description
Referring to fig. 1 and 2, the present invention provides an aquatic target imaging test method with long synthetic aperture time for L-band HH polarization, and a test apparatus used in the method includes a microwave darkroom 1, an L-band HH polarized antenna 2, a target platform 3, a linear track 4, a water container 5, and an aquatic target 7.
The microwave darkroom 1 is in a hollow cuboid shape, a semi-cylinder shape, a semi-dome shape or a quarter-sphere shape, the target platform 3 is a platform with a flat surface and capable of placing objects and is placed in the microwave darkroom 1, the water body container 5 is placed on the target platform 3, and wave-absorbing materials are covered on the periphery of the target platform 3 and the water body container 5. The water body container 5 is made of an L-waveband transmission material or a wave-absorbing material, so that the water body container 5 has the L-waveband weak scattering characteristic. The water body container 5 is filled with a water body 6, the aquatic target 7 floats on the surface of the water body 6, the linear track 4 is installed at the top in the microwave darkroom 1, and the L-band HH polarized antenna 2 is installed on the linear track 4 in a sliding mode.
Preferably, the L-band HH polarized antenna is a tapered full-polarized antenna.
It should be noted that, in this embodiment, a scheme is adopted in which the target platform 3 is fixed and the L-band HH polarized antenna 2 slides along the linear track 4. In another embodiment of the present invention, the target platform 3 may slide along the linear track 4, and the L-band HH polarized antenna 2 may be fixed, so that the L-band HH polarized antenna 2 and the target platform 3 are relatively displaced to form a virtual aperture.
The invention provides an aquatic target imaging test method with long synthetic aperture time for L-waveband HH polarization, which comprises the following test steps:
(1) placing the water body container 5 on a target platform 3, wherein the water body container 5 is filled with water body 6, and the aquatic target 7 floats on the surface of the water body 6;
(2) carrying out initialization calibration on the positions of the overwater target 7 and the L-band HH polarized antenna;
(3) setting a plurality of equidistant position points on a linear track 4, driving an L-band HH polarized antenna 2 to slide along the linear track 4 and pass through the position points one by one, and enabling the relative displacement generated between the L-band HH polarized antenna 2 and a target platform 3 to form a virtual aperture;
(4) when the L-band HH polarized antenna moves to each position point, the L-band HH polarized antenna transmits and receives L-band horizontal polarized signals to form a synthesis array;
(5) and after the data are acquired, imaging the acquired data through a back projection algorithm.
In this embodiment, the distance between the position points on the linear track in step (3) is 15mm, the distance between the L-band HH polarized antenna 2 and the target platform 3 in step (2) is 4.56m, the relative displacement is divided into two bilaterally symmetrical segments around the target platform 3, and the distance between each segment is 2.28m, that is, the L-band HH polarized antenna 2 slides from one side of the target platform 3 to the other side, and the sliding distances on both sides are equal, and are both 2.28 m.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (8)
1. An L-waveband HH-polarized water target imaging test method with long synthetic aperture time is characterized in that a used test device comprises a microwave darkroom, an L-waveband HH-polarized antenna, a target platform, a linear track, a water body container and a water target, wherein the target platform is a platform with a flat surface and capable of placing objects and is placed in the microwave darkroom, and the water body container has L-waveband weak scattering characteristics; the linear track is arranged in a microwave darkroom, and the L-band HH polarized antenna or the target platform is arranged on the linear track in a sliding manner;
the test procedure was as follows:
(1) placing the water body container on a target platform, wherein the water body container is filled with water bodies, and the aquatic target floats on the surface of the water bodies;
(2) carrying out initialization calibration on the positions of the overwater target and the L-band HH polarized antenna;
(3) setting a plurality of equidistant position points on a linear track, driving an L-band HH polarized antenna or a target platform to slide along the linear track and pass through the position points one by one, and enabling the relative displacement generated between the L-band HH polarized antenna and the target platform to form a virtual aperture;
(4) when the L-band HH polarized antenna or the target platform moves to each position point, the L-band HH polarized antenna transmits and receives L-band horizontal polarized signals to form a synthesis array;
(5) and after the data are acquired, imaging the acquired data through a back projection algorithm.
2. The method for testing imaging of an aquatic target with a long synthetic aperture time by means of L-band HH polarization according to claim 1, wherein the linear rail is installed on the top of the microwave darkroom, the L-band HH polarized antenna is installed on the linear rail, the target platform is placed below the linear rail, and the L-band HH polarized antenna slides along the linear rail and is displaced relative to the target platform.
3. The method for testing the imaging of the aquatic target with the long synthetic aperture time of the L-band HH polarization according to claim 1, wherein the water container is made of an L-band transmissive material or a wave-absorbing material.
4. The method for testing the imaging of the aquatic target with the long synthetic aperture time of the L-band HH polarization according to claim 1, wherein the peripheries of the target platform and the water body vessel are covered with a wave-absorbing material.
5. The method for testing imaging of an aquatic target with a long synthetic aperture time for L-band HH polarization of claim 1 wherein the L-band HH polarized antenna is a tapered fully polarized antenna.
6. The method for aquatic target imaging testing with long synthetic aperture time for L-band HH polarization of claim 1 wherein the microwave anechoic chamber is in the shape of a hollow cuboid, or a semi-cylinder, or a semi-dome, or a quarter sphere.
7. The method for testing aquatic target imaging with long synthetic aperture time for L-band HH polarization according to claim 1, wherein the interval of the position points on the linear trajectory in the step (4) is 15 mm.
8. The method for testing imaging of an aquatic target with a long synthetic aperture time for L-band HH polarization according to claim 1, wherein the distance of the relative displacement between the L-band HH polarization antenna and the target platform in step (3) is 4.56m, the relative displacement is divided into two bilaterally symmetric segments centering on the target platform, and the distance of each segment is 2.28 m.
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2021
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Application publication date: 20210914 |