Large-view-field high-precision positioning aerial camera device

Abstract

The invention relates to a large-view-field high-precision positioning aerial camera device, and belongs to the technical field of photoelectric instruments. Comprising a host, a storage hard disk assembly and an optical fiber strapdown heading attitude module, a CMOS detector converts optical imaging information of a ground object into digital image information, the digital image information is compressed and then transmitted to a storage control module, the storage control module divides the digital image information into two paths, one path is directly downloaded to a ground control system through a link, and the other path is directly downloaded to a ground control system through a link. The other path is stored in the storage hard disk assembly; the stable platform control module establishes a coordinate system in the system based on the optical fiber strapdown heading attitude module, realizes isolation of aerial carrier interference in the two-axis direction and stable optical axis high-precision positioning imaging, improves the quality of a single image, and ensures that the positioning precision of reconnaissance equipment is less than or equal to 5m (1 sigma).

Description

Technical Field

[0001] The invention belongs to the technical field of optoelectronic instruments, and in particular relates to a large-field-of-view high-precision positioning aerial camera device. Background Art

[0002] An aerial camera is an optical instrument installed on an aircraft to capture ground targets from the air. It is used for photography, inspections, and aerial scientific research on the ground and in the air on an airplane or other aircraft. Due to its structural characteristics, the focal length and format of an aerial camera can be very large according to demand. Compared with other aerial optoelectronic equipment, it can achieve high resolution and large field of view photography, solving the problem of "seeing clearly" and "seeing everything". The development of digital and information technology has promoted the informatization process of aerial cameras. Aerial cameras are not only used in the traditional way of obtaining images, but also need to obtain detailed digital information of the targets in the image. Among them, obtaining the precise position information of the observed target, improving the positioning accuracy of the target, and solving the problem of "accurate positioning" have become research hotspots for aerial cameras. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is to provide a large-field-of-view high-precision positioning aerial camera device to solve the problem of insufficient positioning accuracy of aerial cameras.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides a large-field-of-view high-precision positioning aerial camera device, comprising: a host, a storage hard disk component, and an optical fiber strapdown attitude module;

[0007] The host comprises: an optoelectronic imaging component, an imaging control module, a main control module, a storage control module, and a stable platform control module;

[0008] The optoelectronic imaging component includes: a CMOS detector and an optical lens;

[0009] The main control module is used for power-on detection of the camera and outputs a photographing instruction to the optical lens. The optical lens performs large-field reconnaissance photography according to the photographing instruction, and the ground object target is imaged on the photosensitive surface of the CMOS detector through the optical lens;

[0010] The CMOS detector converts the optical imaging information of the ground object target into digital image information, which is compressed and transmitted to the storage control module. The storage control module divides the digital image information into two paths, one of which is directly transmitted to the ground control system through the link, and the other is stored in the storage hard disk component;

[0011] The stable platform control module establishes a system internal coordinate system based on the optical fiber strapdown attitude module, realizes isolation of carrier interference in two-axis directions, and stabilizes high-precision positioning and imaging of the optical axis.

[0012] The optical lens uses two groups of lenses for optical stitching to achieve wide-format photo pixels ≥ 30K×5K and large-field reconnaissance photography, and the optical lens is designed to have a focal length of 126mm.

[0013] The digital image information is processed by a ground image processing system for image stitching and location information settlement for user use.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present invention has the following beneficial effects: the field of view of the reconnaissance equipment of the present invention is several times that of a single-piece area array camera, which realizes the expansion of the camera accommodation width and effectively improves the efficiency of aerial reconnaissance; the platform is stabilized, two-axis isolation of carrier interference is achieved, optical axis imaging and forward image shift supplement are stabilized, and the dynamic stabilization accuracy is better than 0.02° (1σ), which improves the quality of a single image and ensures that the positioning accuracy of the reconnaissance equipment is ≤5m (1σ). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A diagram showing the composition of a camera device according to the present invention;

[0017] Figure 2 The main control flow chart of the camera device;

[0018] Figure 3 This is the diagram of the control module structure for the stable platform module. DETAILED DESCRIPTION

[0019] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0020] This embodiment provides a large-field-of-view high-precision positioning aerial camera device, including: a host, a storage hard disk assembly, and an optical fiber strapdown heading module;

[0021] The host comprises: an optoelectronic imaging component, an imaging control module, a main control module, a storage control module, and a stable platform control module;

[0022] The optoelectronic imaging component includes: a CMOS detector and an optical lens;

[0023] The main control module is used for power-on detection of the camera and outputs a photographing instruction to the optical lens. The optical lens performs large-field reconnaissance photography according to the photographing instruction, and the ground object target is imaged on the photosensitive surface of the CMOS detector through the optical lens;

[0024] The CMOS detector converts the optical imaging information of the ground object target into digital image information, which is compressed and transmitted to the storage control module. The storage control module divides the digital image information into two paths, one of which is directly transmitted to the ground control system through the link, and the other is stored in the storage hard disk component;

[0025] The stable platform control module establishes a system internal coordinate system based on the optical fiber strapdown attitude module, realizes isolation of carrier interference in two-axis directions, and stabilizes high-precision positioning and imaging of the optical axis.

[0026] The optical lens uses two groups of lenses for optical stitching to achieve wide-format photo pixels ≥ 30K×5K and large-field reconnaissance photography, and the optical lens is designed to have a focal length of 126mm.

[0027] The digital image information is processed by a ground image processing system for image stitching and location information settlement for user use.

[0028] The device uses a fixed-focal-length double-splice, large-field-of-view, high-resolution, high-quality lens, combined with four CMOS detectors with stitched focal planes for large target area array imaging. It is suitable for the speed of the flying aircraft platform, performs frame rate matching and automatic exposure control, and forms large-area continuous imaging.

[0029] In vertical mode, the camera has an imaging width of more than 6km at an altitude of 5000m. The CMOS detector has a resolution of 8424×6032 and a pixel size of 4.6um. According to the indicator requirement, the ground field of view angle is ≥62°. Considering the indicators comprehensively, 4 CMOS splicing imaging is selected, and 2 lenses are designed to be staggered to achieve the accommodation width. The field of view of a single lens is designed to be 34°. When the design focal length is 126mm, the ground pixel resolution is calculated to reach 0.19m.

[0030] The dual-lens large-field-of-view lenses are staggered in front and back positions for easy arrangement. The imaging width of each lens is more than 3km, perpendicular to the flight direction. The CMOS selected by the equipment is a high-sensitivity device, combined with the optimized design of optics and electronics, which expands the application range and working time of the equipment. At the same time, combined with the ground processing software of the equipment, it can realize the splicing and positioning of multiple strips of images to form a complete large-format image.

[0031] The ground object target is imaged on the photosensitive surface of the CMOS detector through the optical lens. After the photoelectric conversion, the CMOS detector converts the optical imaging information of the ground object target into digital image information. After the digital image information is compressed, it can be directly transmitted to the ground control system through the link, and stored in the hard disk on the camera. After the carrier returns to the ground, the hard disk can be directly removed to export the digital image information. The acquired digital image information is processed by the ground image processing system for image stitching and position information settlement for user use. The main control process of the camera device is as follows: Figure 2 The camera's static image working mode: generates static image data with a single image resolution of 33K×6K. It can be set through the ground control station to: ① Timed continuous multiple-shot mode. ② Fixed overlap continuous multiple-shot mode. ③ Wide-format multiple-shot mode.

[0032] Based on the high-precision fiber-optic strapdown attitude device stabilization platform module, it is mainly composed of Z-axis straight stabilizer (encoder, motor, fiber optic gyroscope), X-axis straight stabilizer (encoder, motor, fiber optic gyroscope), power board, and stabilization platform. It can realize the isolation of carrier interference of aerial camera equipment, forward image motion compensation, and vertical / tilted photography. The shooting distance of the equipment is 3000~10000m, the pixel size of the imaging module is 4.6um, the normal exposure time of the equipment is 400~1000us, and the control speed error range of the stable platform is designed to be 0.694° / s~1.735° / s. During the exposure time, the image shake is no more than one-third of the unit pixel size, ensuring clear image and good image quality. The dynamic stability accuracy is better than 0.02°(1σ), which improves the quality of a single image and ensures that the positioning accuracy of the camera device meets ≤5m.

[0033] The large-field-of-view high-precision positioning aerial digital camera device achieves high performance indicators of pixel resolution ≤0.19m (flight altitude 5000m), coverage width ≥6km (flight altitude 5000m), and positioning accuracy ≤5m (1σ) (Table 1).

[0034] Table 1 Device design performance indicators

[0035]

[0036]

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A large-field-of-view high-precision positioning aerial camera device, characterized in that: include: Host, storage hard disk components, optical fiber strapdown attitude and heading module; The host comprises: an optoelectronic imaging component, an imaging control module, a main control module, a storage control module, and a stable platform control module; The photoelectric imaging component includes: a CMOS detector and an optical lens; The main control module is used for power-on detection of the camera and outputs a photographing instruction to the optical lens. The optical lens performs large-field reconnaissance photography according to the photographing instruction, and the ground object target is imaged on the photosensitive surface of the CMOS detector through the optical lens; The CMOS detector converts the optical imaging information of the ground object target into digital image information, which is compressed and transmitted to the storage control module. The storage control module divides the digital image information into two paths, one of which is directly transmitted to the ground control system through the link, and the other is stored in the storage hard disk component; The stable platform control module establishes a system internal coordinate system based on the optical fiber strapdown attitude module, realizes isolation of carrier interference in two-axis directions, and stabilizes high-precision positioning and imaging of the optical axis.

2. The large-field-of-view high-precision positioning aerial camera device according to claim 1, characterized in that: The optical lens uses two groups of lenses for optical splicing to achieve wide-format photo pixels ≥ 30K×5K and large-field reconnaissance photography, and the optical lens is designed to have a focal length of 126mm.

3. The large-field-of-view high-precision positioning aerial camera device according to claim 1, characterized in that: The digital image information is processed by the ground image processing system for image stitching and position information settlement and is provided to users.

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