CN118050706A - Synthetic aperture radar optical processing system - Google Patents
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Abstract
The invention relates to a synthetic aperture radar optical processing system, belongs to the technical field of synthetic aperture radar imaging processing, and solves the problems of large calculated amount, complex algorithm, poor instantaneity and high dependence on a high-performance calculation chip in the existing method. The invention comprises a main light path and two branch light paths with the same structure, wherein the main light path comprises a Fourier transform lens group, a first optical path compensating prism, a first spatial light modulator and a plurality of beam splitting cubes, and the branch light path comprises a laser, a primary beam expanding lens group, a secondary beam expanding lens group, a first digital micro-mirror array device, two 2f lens groups, small holes, a second optical path compensating prism, a fourth beam splitting cube and a second spatial light modulator. The optical lens in the system can be used as a tool for imaging and information transmission and can also be used as a computing element, has the capability of carrying out Fourier transform, utilizes the lens to replace a computer to process information, can realize real-time processing of data, improves imaging instantaneity, and simultaneously reduces power consumption and heat dissipation.
Description
Technical Field
The invention relates to the technical field of synthetic aperture radar imaging processing, in particular to a synthetic aperture radar optical processing system.
Background
The synthetic aperture radar is a high-resolution radar, has the capability of acquiring target information all-weather which is not possessed by a traditional optical system, the original data of the synthetic aperture radar comprises echo data in two directions of a range direction and a direction, the data size is huge and complex, and the essence of an imaging process is to carry out complex signal processing on the echo data, such as pulse compression and range migration correction processing. With the development of informatization, the requirement of real-time imaging of synthetic aperture radar is increasingly strong. However, since the data size of the synthetic aperture radar is huge and the algorithm is relatively complex, such as pulse compression and range migration correction, a large amount of computing resources are consumed, the existing synthetic aperture radar adopts a digital signal processing mode, relies on a digital chip, has poor real-time performance, and cannot process and transmit real-time data for an aircraft or satellite system with limited communication data rate. With the continuous progress and development of synthetic aperture radar technology, the resolution of the synthetic aperture radar technology is further improved, and particularly, a high-resolution satellite-borne system is high in calculation amount of imaging processing and extremely high in bandwidth required for transmitting echo data. Therefore, data transmission and imaging computation rates are currently critical factors limiting the timeliness of high resolution synthetic aperture radar imaging.
For data processing of synthetic aperture radar, conventionally, after analog signals are converted into digital signals by using a digital-to-analog converter (AD), necessary operation and processing are completed by using a digital signal processing technology (DSP), and the essence of the process is that a mathematical system which is reciprocal to the detection process is constructed by using an algorithm, and information is digitized and then is fed into the system to restore target information. At present, for high-resolution synthetic aperture radars, due to the large data size and bandwidth constraint, the method has poor real-time performance and depends on a high-performance computing chip.
Disclosure of Invention
The invention provides a synthetic aperture radar optical processing system, which aims to solve the problems of large calculated amount, complex algorithm, poor real-time performance and high dependence on a high-performance calculation chip in the traditional synthetic aperture radar data processing method.
In order to solve the problems, the invention adopts the following technical scheme:
The synthetic aperture radar optical processing system comprises a main optical path and two branch optical paths with the same structure, wherein the main optical path comprises a first beam splitting cube, a second beam splitting cube, a Fourier transform lens group, a first optical path compensating prism, a third beam splitting cube and a first spatial light modulator, and each branch optical path comprises a laser, a primary beam expanding lens group, a secondary beam expanding lens group, a first digital micromirror array, a first 2f lens group, a first small hole, a second optical path compensating prism, a second 2f lens group, a fourth beam splitting cube and a second spatial light modulator;
In the two branch light paths, after laser emitted by a laser sequentially passes through a first beam expanding lens group and a second beam expanding lens group to be collimated and expanded, the laser irradiates on a first digital micro-lens array device loaded with synthetic aperture radar amplitude information, laser which is returned from the first digital micro-lens array device and contains the synthetic aperture radar amplitude information sequentially passes through a first 2f lens group, a first small hole, a second optical path compensating prism and a second 2f lens group, after two times of Fourier transform calculation, in the first branch light path, the laser after two times of Fourier transform calculation passes through a first beam splitting cube and a fourth beam splitting cube and irradiates on a second spatial light modulator loaded with the synthetic aperture radar phase information, the laser which returns from the second spatial light modulator and contains the synthetic aperture radar amplitude information and the phase information sequentially passes through the fourth beam splitting cube and the first beam splitting cube and irradiates on the Fourier transform lens group, and the laser after two times of Fourier transform calculation firstly passes through the fourth beam splitting cube irradiates on the Fourier transform lens group, and the laser after the two times of Fourier transform calculation passes through the second beam splitting cube and the second spatial light modulator returns from the second spatial light modulator to the second spatial light modulator and the second beam splitting cube and the synthetic aperture radar phase information sequentially;
The Fourier transform lens group respectively completes two Fourier transforms on the laser which is output by the two branch light paths and contains the amplitude information and the phase information of the synthetic aperture radar, the laser which is returned by the Fourier transform lens group and contains the amplitude information and the phase information of the synthetic aperture radar sequentially passes through the second beam splitting cube, the first optical path compensating prism and the third beam splitting cube and then irradiates the first spatial light modulator to carry out phase modulation, the laser which contains the amplitude information and the phase information of the synthetic aperture radar again completes the Fourier transform, the laser which is subjected to four Fourier transforms passes through the third beam splitting cube and then irradiates the camera, the imaging is carried out on the camera, and the head and tail splicing is carried out on the imaging of the two branch light paths, so that the image formed by the synthetic aperture radar on a detection object is obtained.
Further, the synthetic aperture radar optical processing system further comprises a 4U machine box, and each component of the main optical path and the two branch optical paths is arranged in the 4U machine box.
Still further, the optical processing system of the synthetic aperture radar of the invention further comprises a first digital micromirror array driver, a first spatial light modulator driver, a second spatial light modulator driver, a power supply, a laser driver and a laser power supply, wherein a bottom plate is arranged in the 4U case;
A first digital micromirror array driver for driving the first digital micromirror array is mounted on the base plate and communicates with the digital micromirror array through the flexible circuit board;
a first spatial light modulator driver for driving the first spatial light modulator is mounted on the base plate and communicates with the first spatial light modulator through the flexible circuit board;
a second spatial light modulator driver for driving the second spatial light modulator is mounted on the base plate and communicates with the second spatial light modulator through the flexible circuit board;
the laser, the laser driver and the laser power supply are all arranged on the bottom plate;
the first digital micromirror array, the first spatial light modulator, the second spatial light modulator, and the power supply of the camera are mounted on the chassis.
Further, the first 2f lens group and the second 2f lens group each include a first lens, a second lens, a third lens, and a fourth lens sequentially disposed along the optical path;
the first lens and the fourth lens have the same structure and are arranged in a mirror image in the lens group;
the second lens and the third lens are identical in structure and are arranged in mirror image in the lens group.
Further, the Fourier transform lens group comprises a first Fourier transform lens, a second Fourier transform lens and a plane reflector;
after passing through the first Fourier transform lens and the second Fourier transform lens in sequence, the laser completes primary Fourier transform, the emergent laser is reflected by the plane reflector, and after passing through the second Fourier transform lens and the first Fourier transform lens in sequence, the laser completes primary Fourier transform again.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a synthetic aperture radar optical processing system, which adopts an optical device to construct an optical system equivalent to a microwave process to form an optical system equivalent to a microwave detection process, and a microwave response result of a detection target can be obtained by modulating a microwave signal on a laser beam and reversely sending the microwave signal into the equivalent optical system. The optical lens in the system can be used as a tool for imaging and transmitting information and can also be used as a computing element, has the capability of carrying out Fourier transform, and the mode of processing the numerous and miscellaneous information by using the lens instead of a computer is only related to an optical path, so that the aim of processing data in real time can be fulfilled, the instantaneity of imaging is improved, and meanwhile, the lens is used as a passive device instead of a chip with high performance, so that the power consumption and heat dissipation can be reduced.
Drawings
FIG. 1 is a schematic diagram of an optical processing system in an embodiment of the invention;
FIG. 2 is a schematic diagram of a 2f lens assembly;
FIG. 3 is a schematic diagram of the structure of a Fourier transform lens group;
FIG. 4 is a schematic diagram of a hardware configuration of an optical processing system according to an embodiment of the present invention;
Reference numerals illustrate: 1. a laser; 2. laser light emitted from the laser 1; 3. a first-stage beam expander group; 4. a second-stage beam expander group; 5. a first digital micromirror array; 6. a first 2f lens group; 7. a first aperture; 8. a second optical path compensation prism; 9. a second 2f lens group; 10. a first beam splitting cube; 11. a fourth beam splitting cube; 12. a second spatial light modulator; 13. a second beam splitting cube; 14. a fourier transform lens group; 15. a first optical path compensation prism; 16. a third beam splitting cube; 17. a first spatial light modulator; 18. a camera; 19. a 4U chassis; 20. a bottom plate; 21. a first digital micromirror array driver; 22. a first spatial light modulator driver; 23. a second spatial light modulator driver; 24. a power supply; 25. a laser driver; 26. a laser power supply; 27. a third spatial light modulator; 28. a third spatial light modulator driver; 29. a second digital micromirror array; 30. a second digital micromirror array driver; 31. a first light source assembly; 32. a first 4f component; 33. a second light source assembly; 34. a second 4f component; 35. a first lens; 36. a second lens; 37. a third lens; 38. a fourth lens; 39. a first fourier transform lens; 40. a second fourier transform lens; 41. plane reflecting mirror.
Detailed Description
In the synthetic aperture radar imaging calculation, the largest calculation amount is derived from Fourier transformation, which is the most basic operation in optical information processing, and the Fourier transformation can be easily realized at the speed of light speed by utilizing an optical Fourier lens without consuming calculation power. The optical lens can be used as a tool for imaging and transmitting information and can also be used as a calculating element, and the optical system is used as an analog system, so that the optical system has infinite bandwidth theoretically, the information of the radar is modulated into the optical system, the Fourier lens is used for replacing computer processing, the processing time is only related to the optical path, the transmission is not limited by the bandwidth, and the pressure of real-time processing and transmission can be greatly reduced. The technical scheme of the invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
The principle of the disclosed optical processing system of the synthetic aperture radar is shown in figure 1, the optical processing system comprises a main optical path and two branch optical paths with the same structure, and the two branch optical paths share the main optical path. Specifically, the main optical path includes a first beam splitting cube 10, a second beam splitting cube 13, a fourier transform mirror group 14, a first optical path compensating prism 15, a third beam splitting cube 16, a first spatial light modulator 17, and a camera 18; each branch light path comprises a laser 1, a primary beam expander group 3, a secondary beam expander group 4, a first digital micromirror array 5, a first 2f lens group 6, a first small hole 7, a second optical path compensating prism 8, a second 2f lens group 9, a fourth beam splitting cube 11 and a second spatial light modulator 12.
In the first branch light path, the laser 1 emits laser 2, the laser is collimated and expanded by the first beam expander group 3 and the second beam expander group 4 in sequence, then irradiates the laser on the first digital micro-mirror array 5 loaded with the synthetic aperture radar amplitude information, the laser containing the synthetic aperture radar amplitude information returned from the first digital micro-mirror array 5 sequentially passes through the first 2f lens group 6, the first small hole 7, the second optical path compensating prism 8 and the second 2f lens group 9, then completes two Fourier transform calculations, the laser after two Fourier transform calculations firstly sequentially passes through the first beam splitter cube 10 and the fourth beam splitter cube 11, irradiates the second spatial light modulator 12 loaded with the synthetic aperture radar phase information, the laser containing the synthetic aperture radar amplitude information and the phase information returned from the second spatial light modulator 12, the laser beam which is returned by the Fourier transform lens group 14 and contains the amplitude information and the phase information of the synthetic aperture radar sequentially passes through the second beam splitting cube 13, the first beam splitting cube 15 and the third beam splitting cube 16, the liquid crystal molecules of the first spatial light modulator 17 are irradiated, the first spatial light modulator 17 modulates the phases of the laser beam by adjusting the arrangement of the liquid crystal molecules, the laser beam which is subjected to four times of Fourier transform passes through the third beam splitting cube 16 and is irradiated to the camera 18, the imaging of the first branch light path is completed on the camera 18, and the imaging of the first branch light path is completed.
The structures of the 2f lens groups adopted by the first 2f lens group 6 and the second 2f lens group 9 are as shown in fig. 2, and each 2f lens group includes a first lens 35, a second lens 36, a third lens 37, and a fourth lens 38. After the laser beam passes through the first lens 35 and the second lens 36 to form a first focal length f, the laser beam passes through the third lens 37 and the fourth lens 38 to form a second focal length f, and the laser beam passes through the 2f lens group to complete Fourier transform. The first lens 35 is arranged in mirror image in the 2f lens group in the same manner as the fourth lens 38, and the second lens 36 is arranged in mirror image in the 2f lens group in the same manner as the third lens 37.
The fourier transform lens group 14 has a structure as shown in fig. 3, and includes a first fourier transform lens 39, a second fourier transform lens 40, and a plane mirror 41. After passing through the first fourier transform lens 39 and the second fourier transform lens 40 in order, the laser beam completes the fourier transform once, the emitted laser beam irradiates the plane mirror 41, is reflected by the plane mirror 41, passes through the second fourier transform lens 40 and the first fourier transform lens 39 in order, and completes the fourier transform once again.
The second branch light path has the same structure as the first branch light path, and is similar to the first branch light path, in the second branch light path, the laser emits laser light, the laser light is collimated and expanded by the first beam expander group and the second beam expander group in sequence, and then irradiates the laser light on the second digital micromirror array 29 loaded with the synthetic aperture radar amplitude information, the laser light containing the synthetic aperture radar amplitude information returned from the second digital micromirror array 29 sequentially passes through the third 2f lens group, the second small hole, the third optical path compensating prism and the fourth 2f lens group, the two Fourier transform calculations are completed, the laser light after the two Fourier transform calculations sequentially passes through the fifth beam expander cube and irradiates the third spatial light modulator 27 loaded with the synthetic aperture radar phase information, the laser light containing the synthetic aperture radar amplitude information and the phase information returned from the third spatial light modulator 27, then sequentially passes through a fifth beam splitting cube and a first beam splitting cube 10, passes through a second beam splitting cube 13 and irradiates to a Fourier transform lens group 14, the Fourier transform lens group 14 completes two times of Fourier transform on laser containing amplitude information and phase information of the synthetic aperture radar, the laser containing the amplitude information and the phase information of the synthetic aperture radar returned by the Fourier transform lens group 14 sequentially passes through the second beam splitting cube 13, a first optical path compensating prism 15 and a third beam splitting cube 16 and irradiates to liquid crystal molecules of a first spatial light modulator 17, the first spatial light modulator 17 modulates the phases of the laser by adjusting the arrangement of the liquid crystal molecules, the laser after four times of Fourier transform passes through the third beam splitting cube 16 and irradiates to a camera 18 for imaging on the camera 18, and completing the imaging of the second branch optical path.
After the optical processing system of the synthetic aperture radar completes the optical processing of the incident light, the camera 18 respectively obtains the imaging of the two branch light paths, and performs head-to-tail stitching on the imaging of the two branch light paths, so as to finally obtain an image formed by the synthetic aperture radar on the detection object.
Further, the synthetic aperture radar optical processing system of the present embodiment further includes a 4U chassis 19, and each component included in the main optical path and the two branch optical paths is installed in the 4U chassis 19.
As shown in fig. 4, the synthetic aperture radar optical processing system includes a 4U chassis 19, a laser 1, a chassis 20, a first digital micromirror array driver 21, a first digital micromirror array 5, a first light source module 31, a first 4f module 32, a first spatial light modulator driver 22, a first spatial light modulator 17, a third beam splitting cube 16, a fourier transform mirror group 14, a second spatial light modulator 12, a second spatial light modulator driver 23, a power supply 24 for the spatial light modulator/digital micromirror array/camera, a laser driver 25, a laser power supply 26, a third spatial light modulator driver 28, a third spatial light modulator 27, a second 4f module 34, a second light source module 33, a second digital micromirror array 29, and a second digital micromirror array driver 30.
The laser 1 splits laser light through optical fibers and respectively lights a first light source component 31 in a first branch light path and a second light source component 33 in a second branch light path, wherein the first light source component 31 and the second light source component 33 are respectively integrated with a primary beam expander group and a secondary beam expander group in the respective light paths. The laser 1, the laser driver 25 and the laser power supply 26 are directly mounted on the chassis 20 inside the 4U chassis 19, and the first digital micromirror array 5, the first spatial light modulator 17, the second spatial light modulator 12 and the power supply 24 of the camera 18 are also mounted on the chassis 20. A first digital micromirror array driver 21 is mounted on the base plate 20 in communication with the first digital micromirror array 5 through a flexible circuit board. A second digital micromirror array driver 30 is mounted on the base plate 20 in communication with the second digital micromirror array 29 through a flexible circuit board. A first spatial light modulator driver 22 is mounted on the base plate 20 and the first spatial light modulator 17 is mounted on the third beam splitting cube 16, the first spatial light modulator driver 22 being in communication with the first spatial light modulator 17 via a flexible circuit board. A second spatial light modulator driver 23 is mounted on the base plate 20 and a second spatial light modulator 12 is mounted on the fourth beam splitting cube 11, the second spatial light modulator driver 23 being in communication with the second spatial light modulator 12 via a flexible circuit board. A third spatial light modulator driver 28 is mounted on the base plate 20, a third spatial light modulator 27 is mounted on the fifth beam splitting cube, and the third spatial light modulator driver 28 communicates with the third spatial light modulator 27 through a flexible circuit board.
The collimated laser beam emitted from the first light source module 31 is irradiated onto the first digital micromirror array 5 loaded with the synthetic aperture radar amplitude information, and after passing through the first 4f module 32, the laser beam containing the synthetic aperture radar amplitude information is subjected to fourier transform computation twice, and after passing through the second spatial light modulator 12, the fourier transform mirror group 14, the third beam splitting cube 16, and the first spatial light modulator 17, is imaged by the camera 18, and thus the synthetic aperture radar optical processing is completed. The collimated laser beam emitted from the second light source unit 33 is irradiated onto the second digital micromirror array 29 on which the synthetic aperture radar amplitude information is loaded, and the laser beam containing the synthetic aperture radar amplitude information is passed through the second 4f unit 34, then subjected to fourier transform computation twice, passed through the fifth beam splitting cube, the third spatial light modulator 27, the fourier transform mirror group 14, and the first spatial light modulator 17, and then imaged by the camera 18, thereby completing the synthetic aperture radar optical processing again.
The invention mainly aims to design a synthetic aperture radar optical processing system, an optical device is adopted to construct an optical system equivalent to a microwave process, the optical system equivalent to a microwave detection process is formed, and a microwave response result of a detection target can be obtained by modulating a microwave signal on a laser beam and reversely sending the microwave signal into the equivalent optical system. The optical lens in the system can be used as a tool for imaging and transmitting information and can also be used as a computing element, has the capability of carrying out Fourier transform, and the mode of processing the numerous and miscellaneous information by using the lens instead of a computer is only related to an optical path, so that the aim of processing data in real time can be realized, and the lens replaces a chip with high performance, can be regarded as a passive device, and can reduce power consumption and heat dissipation. Simulation and laboratory experiments show that the synthetic aperture radar optical processing system is practical and effective.
The optical processing system of the invention essentially establishes an optical system equivalent to the synthetic aperture radar detection process in a physical layer, and the core difference between the two is that the detection medium is microwave, the optical processing system is light wave, and the reversibility of the light path is utilized to restore the microwave information of the detection object into applicable image information. The optical system is an analog system, is almost free from bandwidth limitation during signal transmission, and the Fourier transformation part with the largest calculation amount is realized by adopting a passive device such as a Fourier lens. The optical system is utilized to process the synthetic aperture radar signal and image in real time, and the method has the great advantages of good real-time performance and high energy efficiency ratio.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. The synthetic aperture radar optical processing system is characterized by comprising a main optical path and two branch optical paths with the same structure, wherein the main optical path comprises a first beam splitting cube (10), a second beam splitting cube (13), a Fourier transform lens group (14), a first optical path compensating prism (15), a third beam splitting cube (16) and a first spatial light modulator (17), and each branch optical path comprises a laser (1), a primary beam expanding lens group (3), a secondary beam expanding lens group (4), a first digital micro-mirror array (5), a first 2f lens group (6), a first small hole (7), a second optical path compensating prism (8), a second 2f lens group (9), a fourth beam splitting cube (11) and a second spatial light modulator (12);
In the two branch light paths, laser (2) emitted by a laser (1) sequentially passes through a primary beam expander group (3) and a secondary beam expander group (4) for collimation and beam expansion, then irradiates on a first digital micro-mirror array (5) loaded with synthetic aperture radar amplitude information, laser containing the synthetic aperture radar amplitude information returned from the first digital micro-mirror array (5) sequentially passes through a first 2f lens group (6), a first small hole (7), a second optical path compensating prism (8) and a second 2f lens group (9), after two Fourier transform calculations, in the first branch light path, the laser after two Fourier transform calculations sequentially passes through a first beam splitting cube (10) and a fourth beam splitting cube (11) and then irradiates on a second spatial light modulator (12) loaded with synthetic aperture radar phase information, laser containing synthetic aperture radar amplitude information and phase information returned from the second spatial light modulator (12) sequentially passes through the fourth beam splitting cube (11) and the first beam splitting cube (10), passes through the second beam splitting cube (13) and irradiates to the Fourier transform mirror group (14), in the second optical path, the laser after two times of Fourier transform calculation irradiates to the second spatial light modulator (12) loaded with the synthetic aperture radar phase information through the fourth beam splitting cube (11), the laser containing the synthetic aperture radar amplitude information and the synthetic aperture radar phase information returned from the second spatial light modulator (12), then sequentially passing through the fourth beam splitting cube (11) and the first beam splitting cube (10), and then passing through the second beam splitting cube (13) to irradiate to the Fourier transform lens group (14);
The Fourier transform lens group (14) respectively completes two Fourier transforms on the laser which is output by the two branch light paths and contains the amplitude information and the phase information of the synthetic aperture radar, the laser which is returned by the Fourier transform lens group (14) and contains the amplitude information and the phase information of the synthetic aperture radar sequentially passes through the second beam splitting cube (13), the first optical path compensating prism (15) and the third beam splitting cube (16) and then irradiates on the first spatial light modulator (17) to carry out phase modulation, the laser which contains the amplitude information and the phase information of the synthetic aperture radar again completes the Fourier transform, the laser which is subjected to four Fourier transforms irradiates on the camera (18) after passing through the third beam splitting cube (16), the imaging is carried out on the camera (18), and the imaging of the two branch light paths is spliced end to end, so that the image formed by the synthetic aperture radar on a detection object is obtained.
2. A synthetic aperture radar optical processing system according to claim 1 further comprising a 4U chassis (19), each of the components comprised by the main optical path and the two branch optical paths being mounted within the 4U chassis (19).
3. A synthetic aperture radar optical processing system according to claim 2 further comprising a first digital micromirror array driver (21), a first spatial light modulator driver (22), a second spatial light modulator driver (23), a power supply (24), a laser driver (25) and a laser power supply (26), wherein the base plate (20) is mounted inside the 4U chassis (19);
A first digital micromirror array driver (21) for driving the first digital micromirror array (5) is mounted on the base plate (20) and communicates with the digital micromirror array (5) through a flexible circuit board;
A first spatial light modulator driver (22) for driving the first spatial light modulator (17) is mounted on the base plate (20) and communicates with the first spatial light modulator (17) through a flexible circuit board;
a second spatial light modulator driver (23) for driving the second spatial light modulator (12) is mounted on the base plate (20) and communicates with the second spatial light modulator (12) through a flexible circuit board;
The laser (1), the laser driver (25) and the laser power supply (26) are all arranged on the bottom plate (20);
A power supply (24) for the first digital micromirror array (5), the first spatial light modulator (17), the second spatial light modulator (12) and the camera (18) is mounted on the base plate (20).
4. A synthetic aperture radar optical processing system according to claim 1, characterized in that the first 2f lens group (6) and the second 2f lens group (9) each comprise a first lens (35), a second lens (36), a third lens (37) and a fourth lens (38) arranged in sequence along the optical path;
The first lens (35) and the fourth lens (38) are identical in structure and are arranged in a mirror image in the lens group;
The second lens (36) and the third lens (37) are identical in structure and are arranged in mirror image in the lens group.
5. A synthetic aperture radar optical processing system according to claim 1, characterized in that the fourier transform mirror group (14) comprises a first fourier transform lens (39), a second fourier transform lens (40) and a plane mirror (41);
After passing through the first Fourier transform lens (39) and the second Fourier transform lens (40) in sequence, the laser completes one Fourier transform, the emitted laser is reflected by the plane mirror (41), and after passing through the second Fourier transform lens (40) and the first Fourier transform lens (39) in sequence, the laser completes one Fourier transform again.
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