Galvanometer scanning type multispectral satellite remote sensing method

Abstract

The invention relates to the field of satellite remote sensing, in particular to a galvanometer scanning type multispectral satellite remote sensing method, which comprises a galvanometer scanning system, a reflector group, a detection system and a computer control and processing system which are sequentially arranged along a light path transmission direction, the galvanometer scanning system is used for scanning a to-be-measured target and collecting an echo light beam; the reflector group is used for collecting and focusing echo light beams; the detection system is used for detecting echo light beams and transmitting the echo light beams to the computer; and the computer control and processing system realizes control of galvanometer scanning, processing of echo data and image reconstruction. According to the local galvanometer scanning type multispectral satellite remote sensing method, the scanning speed and the scanning precision are improved, the stability of a satellite in the scanning process is ensured, and the quality of a final reconstructed image is improved.

Description

Technical Field

[0001] The invention relates to the field of satellite remote sensing, and in particular to a galvanometer scanning multi-spectrum satellite remote sensing method. Background Art

[0002] Satellite remote sensing is a technology that uses sensors carried by satellites to monitor and collect data on the earth's surface. Its key feature is non-contact long-distance observation. Through satellite remote sensing, various information about the earth's surface can be obtained, including topography, vegetation cover, land use, climate change, ocean conditions, etc. This technology has a wide range of applications in earth science, environmental monitoring, resource management, agriculture, urban planning and other fields.

[0003] In the process of multi-spectral satellite remote sensing, it is a very important process to use sensors to sense electromagnetic radiation from different bands on the earth's surface to collect ground information. In this process, scanning and detecting the target information to be measured is the key to information collection. The existing technology usually uses rotating mirror scanning to adjust the direction of the satellite's field of view so that it can scan different areas on the earth's surface. The rotation of the rotating mirror during the rotating mirror scanning process will cause mechanical vibration and inertial force, which will directly affect the scanning quality and the stability of the satellite, and interfere with high-precision remote sensing instruments. And because the mechanical system requires a certain response time, high-speed scanning will also cause greater mechanical vibration, and the scanning speed of the rotating mirror scanning is also very limited.

[0004] Therefore, technicians in this field are in urgent need of a satellite remote sensing method with higher scanning stability and faster scanning speed. Summary of the invention

[0005] The object of the present invention is to provide a galvanometer scanning multi-spectral satellite remote sensing method to solve the problems of limited scanning speed and insufficient mechanical stability during satellite remote sensing scanning.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A galvanometer scanning multi-spectral satellite remote sensing method, comprising a galvanometer scanning system, a reflector group, a detection system, and a computer control and processing system arranged in sequence along the optical path transmission direction; The galvanometer scanning system includes an X-galvanometer, a Y-galvanometer, a swing motor, a photoelectric sensor, and a connecting shaft, and is used to scan the reflected light waves of the target to be measured and input the echo light beam to the reflector group; The reflector group is composed of three spherical reflectors with large curvature, which are used to collect and focus the echo beam from the target to be measured, and input the echo beam into the detection system; The detection system is composed of an optical element beam splitter cube and a single photon detector. The beam splitter cube can split the optical path of the echo light beam, and input the split light beam into the single photon detector to realize multi-spectrum detection. The computer control and processing system is used to control the swing motor by driving current and receiving position feedback signals from the photoelectric sensor, and is also used to control the single photon detector and the data processing of the echo; The reflector group, detection system, computer control and processing system are all located in the main structure of the satellite.

[0007] Furthermore, the X galvanometer and Y galvanometer in the galvanometer system: establish a world coordinate system with O-XYZ, XOY is a horizontal plane parallel to the ground, the X galvanometer rotates around the Z axis, and the Y galvanometer rotates around the X axis; the X galvanometer realizes scanning in different directions of the X axis, and the Y galvanometer realizes scanning in different directions of the Y axis; the echo light beam is input from the ZO direction, transmitted through the YO direction, and output from the XO direction.

[0008] Furthermore, the deflection states of the X galvanometer mirror and the Y galvanometer mirror in the galvanometer scanning system are controlled by a swing motor.

[0009] Furthermore, the deflection state of the swing motor in the galvanometer scanning system is controlled by a direct drive signal of a computer control and processing system and a position feedback signal of a photoelectric sensor, thereby realizing feedback regulation of the deflection state of the galvanometer.

[0010] Furthermore, the galvanometer scanning system and the satellite body are connected by a connecting shaft.

[0011] Furthermore, the reflective mirrors in the reflective mirror group are placed at a certain angle and position to match the echo light beam of the system to achieve light beam collection and focusing.

[0012] Furthermore, the computer control and processing system includes a processor for receiving a position feedback signal from a photoelectric sensor and sending a drive signal.

[0013] Furthermore, the computer control and processing system includes a single-photon detector data receiving unit and a multi-spectral single-photon image reconstruction algorithm.

[0014] Based on the above technical solution, it can be known that compared with the prior art, the present invention discloses a galvanometer scanning multi-spectral satellite remote sensing method, which realizes the scanning of the target to be measured and the collection of the echo light beam through the polarization of two galvanometers. While ensuring the stability of the satellite, the scanning speed and scanning accuracy are improved, the image reconstruction quality is higher, and the application of the galvanometer scanning system in the field of satellite remote sensing is expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of a galvanometer scanning satellite.

[0017] Figure 2 A schematic diagram of a multi-spectral satellite remote sensing method based on galvanometer scanning provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0019] like Figure 2 As shown, an embodiment of the present invention discloses a schematic diagram of a galvanometer scanning multi-spectral satellite remote sensing method, including a galvanometer scanning system, a reflector group 2, a detection system, and a computer control and processing system 5.

[0020] The galvanometer scanning system includes an X-galvanometer 10, a Y-galvanometer 9, an X-axis swing motor 11, a Y-axis swing motor 8, an X-axis photoelectric sensor 12, a Y-axis photoelectric sensor 7, an X-axis connecting shaft 13, and a Y-axis connecting shaft 6; After the echo beam 1 from the target to be measured is incident on the Y galvanometer 9, it is reflected by the Y galvanometer 9 to the X galvanometer 10, and then reflected by the X galvanometer 10 to the reflector group 2; when the X swing motor 12 drives the X galvanometer 10 to rotate by an angle α, the position of the scanned plane changes by θx; when the Y swing motor 8 drives the Y galvanometer 9 to rotate by an angle β, the position of the scanned plane changes by θy, and the relationship satisfies: ;

[0021] Furthermore, the swing control of the X-axis swing motor 12 and the Y-axis swing motor 7 is realized by the computer control and processing system 5, so as to realize the scanning of the target area of ​​the plane to be measured; The reflector group 2 includes three spherical reflectors, which are placed at a specific angle to collect and focus the echo beam 1 from the galvanometer scanning system; The detection system includes a beam splitter cube 3 and a single photon detector 4. After being focused by the reflector group 2, the echo light beam 1 propagates into the beam splitter cube 3 to generate three light paths. The three light paths all hit the single photon detector 4. The single photon detector 4 uses the photoelectric effect to convert photons into electronic signals and transmits them to the computer control and processing system 5. The data receiving unit of the computer control and processing system 5 receives the echo data from the single-photon detector 4 and realizes complete satellite remote sensing through a multi-spectral single-photon image reconstruction algorithm.

[0022] In another specific embodiment, the reflector group 2 uses an aspherical mirror to better correct optical distortion, improve imaging quality, and meet specific design requirements.

[0023] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A galvanometer scanning multi-spectral satellite remote sensing method, characterized in that: include: A galvanometer scanning system, a reflector group, a detection system, and a computer control and processing system are sequentially arranged along the optical transmission direction; The galvanometer scanning system includes an X-galvanometer, a Y-galvanometer, a swing motor, a photoelectric sensor, and a connecting shaft, and is used to scan the reflected light waves of the target to be measured and input the echo light beam to the reflector group; The reflector group is composed of three spherical reflectors with large curvature, which are used to collect and focus the echo beam from the target to be measured, and input the echo beam into the detection system; The detection system is composed of an optical element beam splitter cube and a single photon detector. The beam splitter cube can split the optical path of the echo light beam, and input the split light beam into the single photon detector to realize multi-spectrum detection. The computer control and processing system is used to control the swing motor by driving current and receiving position feedback signals from the photoelectric sensor, and is also used to control the single photon detector and the data processing of the echo; The reflector group, detection system, computer control and processing system are all located in the main structure of the satellite.

2. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The X galvanometer and Y galvanometer in the galvanometer scanning system: establish a world coordinate system with O-XYZ, XOY is a horizontal plane parallel to the ground, the X galvanometer rotates around the Z axis, and the Y galvanometer rotates around the X axis; the X galvanometer realizes scanning in different directions of the X axis, and the Y galvanometer realizes scanning in different directions of the Y axis; The echo beam is input from the ZO direction, transmitted through the YO direction, and output from the XO direction.

3. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The deflection states of the X-mirror and the Y-mirror in the galvanometer scanning system are controlled by a swing motor.

4. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The deflection state of the swing motor in the galvanometer scanning system is controlled by the direct drive signal of the computer control and processing system and the position feedback signal of the photoelectric sensor, so as to realize the feedback regulation of the deflection state of the galvanometer.

5. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The galvanometer scanning system and the satellite body are connected by a connecting shaft.

6. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The reflective mirrors in the reflective mirror group are placed at a certain angle and position to match the return beam of the system to achieve light beam collection and focusing.

7. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The computer control and processing system includes a processor that receives a photoelectric sensor position feedback signal and sends a drive signal.

8. The galvanometer scanning multi-spectral satellite remote sensing method according to claim 1, characterized in that: The computer control and processing system comprises a single-photon detector data receiving unit and a multi-spectral single-photon image reconstruction algorithm.

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