Aerial camera time sequence pulse generator supporting multi-degree-of-freedom image motion compensation function

Abstract

The invention discloses an aerial camera time sequence pulse generator supporting a multi-degree-of-freedom image motion compensation function, and is applied to the technical field of space flight and aviation. The system specifically comprises a pixel synchronous clock generation module, an analog-to-digital conversion clock generation module, a reset pulse generation module, a correlated double sampling clock generation module, a horizontal charge transfer driving module, a vertical charge transfer driving module, a front-end signal processing control signal generation module and a synchronous signal generation module. The external synchronization module is used for receiving an external synchronization frame, a line signal and an external trigger signal and generating an image frame and a line synchronization signal; the bus and interface control module is used for communicating with an external controller, receiving a control instruction and configuration data, and performing data transmission and instruction interaction with a subordinate chip through a communication interface; the signal coupling and output module is used for coupling and processing the received signals and then outputting the signals; according to the invention, the imaging quality and performance of the aerial camera can be improved, and the continuous development of the aerospace technology is promoted.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to an aerial camera timing pulse generator supporting a multi-degree-of-freedom image shift compensation function. Background Art

[0002] During the imaging process of the aerial camera, the reconnaissance aircraft (carrier aircraft) will make adjustments according to tactical requirements, such as pitch, yaw, roll, and compound movements, etc. The carrier aircraft's attitude adjustment and compound movement changes will cause the imaging system of the aerial camera on the carrier aircraft to produce image shift on the image plane, thereby causing the imaging performance of the optical system to deteriorate, and in severe cases even cause the image to be blurred and unusable.

[0003] Image shifts with different sizes and directions on the detector image plane under different flight attitudes and compound motion states of the carrier aircraft are called multi-DOF high-dynamic image shifts. The carrier aircraft's attitude adjustment and compound motion during flight have important technical and tactical significance. The timing pulse generator of an aerial camera is the core of the aerial camera electronics system. It not only provides the timing pulse signal required for the CCD to work, but also provides various processing timings and image frame and line synchronization signals for the front-end signal processing circuit. However, the current timing pulse generator of an aerial camera does not have the function of compensating for multi-DOF image shifts.

[0004] In order to overcome these defects, the present application proposes an aerial camera timing pulse generator that supports multi-degree-of-freedom image motion compensation function. Summary of the invention

[0005] The purpose of this application is to provide an aerial camera timing pulse generator that supports multi-degree-of-freedom image motion compensation function, aiming to solve the above-mentioned problems.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides an aerial camera timing pulse generator supporting multi-DOF image motion compensation function, including:

[0008] The bus and interface control module is used to communicate with the external controller, receive control instructions and configuration data, and perform data transmission and instruction interaction with the lower-level chip through the communication interface;

[0009] A pixel synchronization clock generating module, used for generating a pixel synchronization clock;

[0010] An analog-to-digital conversion clock generation module is used to generate analog and digital conversion clocks;

[0011] A reset pulse generating module, used for generating a reset clock for an output amplifier;

[0012] A correlated double sampling clock generation module, used for generating a correlated double sampling clock;

[0013] A horizontal charge transfer driving module, used for generating a driving clock for driving charge transfer in the horizontal direction;

[0014] A vertical charge transfer driving module, used for generating a driving clock for driving charge transfer in the vertical direction;

[0015] A front-end signal processing control signal generating module, used to generate a clamping control signal of a front-end signal processing circuit;

[0016] A synchronization signal generating module, used for receiving external synchronization frames, line signals, external trigger signals, and generating image frames and line synchronization signals;

[0017] The signal coupling and output module couples and processes the received signal and then outputs it.

[0018] Further, the bus and interface control module are respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module;

[0019] The signal coupling and output module is respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module.

[0020] Furthermore, the horizontal charge transfer driving module drives the horizontal charge to transfer, thereby compensating for the image shift of the aerial image in the horizontal direction of the detector;

[0021] The vertical charge transfer driving module drives the vertical charge to transfer, thereby compensating for the image shift of the aerial image in the vertical direction of the detector.

[0022] Further, the detector includes pixels arranged in rows and columns;

[0023] The pixels have respective charge moving speeds, and transmit pixel information at the same or different rates in the row and column directions;

[0024] The driving circuit controls the charges in the row and column directions so that the charges are driven along the row and column directions respectively to transfer the charges.

[0025] Furthermore, the aerial camera timing generator is developed through an FPGA development board and has a modular design.

[0026] The present application provides an aerial camera timing pulse generator supporting a multi-degree-of-freedom image motion compensation function, which has the following beneficial effects:

[0027] (1) The conventional aerial camera timing pulse generator does not have the function of compensating for multi-DOF image motion. However, the present application can compensate for the image motion of the aerial image in the horizontal direction and the vertical direction of the detector respectively by designing a horizontal charge transfer driving module and a vertical charge transfer driving module, thereby realizing effective compensation for multi-DOF image motion.

[0028] (2) During the flight of an aerial camera, the flight attitude adjustment of the reconnaissance aircraft will cause the image on the target surface to produce image displacements of different sizes and directions, which seriously affects the image quality. This application can significantly improve the image quality of the aerial camera by compensating for these image displacements, ensuring that the captured images are clear and accurate.

[0029] (3) FPGA modular design is adopted to realize the integration and modularization of the timing pulse generator by integrating multiple functional modules such as bus and interface control module, pixel synchronization clock generation module, analog-to-digital conversion clock generation module, etc.; the flexibility and scalability of the timing pulse generator of aerial cameras are improved, the cost is reduced, and new ideas are provided for the development of a new generation of timing pulse generators for aerial cameras. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of an aerial camera timing pulse generator supporting a multi-DOF image motion compensation function according to Example 1 of the present application;

[0031] Figure 2 The schematic diagram of the aerial multi-degree-of-freedom image shift and the schematic diagram of the target surface multi-degree-of-freedom image shift of Example 1 of the present application;

[0032] Figure 3 This is a schematic diagram of the detector composition that supports the multi-degree-of-freedom image motion compensation function of Example 1 of the present application. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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.

[0035] Example 1

[0036] See also Figure 1 , which is a schematic diagram of the structure of an aerial camera timing pulse generator supporting a multi-DOF image motion compensation function according to Embodiment 1 of the present application; comprising:

[0037] The bus and interface control module is used to communicate with the external controller, receive control instructions and configuration data, and perform data transmission and instruction interaction with the lower-level chip through the communication interface;

[0038] A pixel synchronization clock generating module, used for generating a pixel synchronization clock;

[0039] An analog-to-digital conversion clock generation module is used to generate analog and digital conversion clocks;

[0040] A reset pulse generating module, used for generating a reset clock for an output amplifier;

[0041] A correlated double sampling clock generation module, used for generating a correlated double sampling clock;

[0042] A horizontal charge transfer driving module, used for generating a driving clock for driving charge transfer in the horizontal direction;

[0043] A vertical charge transfer driving module, used for generating a driving clock for driving charge transfer in the vertical direction;

[0044] A front-end signal processing control signal generating module, used to generate a clamping control signal of a front-end signal processing circuit;

[0045] A synchronization signal generating module, used for receiving external synchronization frames, line signals, external trigger signals, and generating image frames and line synchronization signals;

[0046] The signal coupling and output module couples and processes the received signal and then outputs it.

[0047] In this embodiment, the connection method of each module in the aerial camera timing pulse generator is as follows: the bus and interface control module are respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module, and are connected through the RS422 interface.

[0048] The signal coupling and output module is respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module, and is connected through an RS422 interface.

[0049] Specifically, the bus and interface control module is used to communicate with the external controller and receive various control instructions, such as focus +, focus -, dimming +, dimming -, power on, power off, etc.; as well as configuration data such as focal length value, aircraft flight speed, flight altitude, tilt angle, angular velocity, etc.; and provide communication interfaces with lower-level chips, such as horizontal drive chips, vertical drive chips, and front-end signal processing chips. The horizontal charge transfer drive module drives the horizontal charge to transfer to compensate for the image shift of the aerial image in the horizontal direction of the detector. The vertical charge transfer drive module drives the vertical charge to transfer to compensate for the image shift of the aerial image in the vertical direction of the detector. Therefore, the multi-degree-of-freedom image shift generated by the aerial image on the detector can be compensated. Among them, the aerial camera timing generator is developed through the FPGA development board, with a modular design, which can reduce the system volume, quality, power consumption, and cost, and provides a new idea for the development of a new generation of aerial camera timing pulse generators.

[0050] See also Figure 2 , which is a schematic diagram of the aerial multi-degree-of-freedom image shift and a schematic diagram of the target surface multi-degree-of-freedom image shift of Example 1 of the present application. During the reconnaissance process, the reconnaissance aircraft needs to fly at high speed and low altitude to avoid the surveillance of the enemy radar. High-speed and low-altitude flight greatly improves the aircraft's own battlefield survivability and in-depth reconnaissance and surveillance capabilities, but at this time, serious image shift will appear on the target surface of the aerial imaging, resulting in blurred aerial imaging. The existence of image shift greatly affects the camera imaging quality and significantly reduces the resolution of the aerial image. When there is image shift, the outline of the captured target is not clear, and there is a transition zone of varying sizes between the target and the surrounding background, which expands with the increase of image shift. When the transition zone reaches a certain extent, it will cause the images of two adjacent targets to overlap or even become indistinguishable. In addition to forward flight, the flight attitude of the reconnaissance aircraft will also be adjusted according to technical and tactical requirements, such as pitch, yaw and roll, as well as compound multi-degree-of-freedom motion. Corresponding to different flight attitudes, the image will leave different image shift trajectories on the target surface.

[0051] See also Figure 3 , which is a schematic diagram of the detector composition supporting the multi-DOF image motion compensation function of Example 1 of the present application. The detector supporting the multi-DOF image motion compensation function has pixels arranged in rows and columns, which are subdivided into multiple pixel element units. For all pixels in the detector unit, each pixel has its own charge movement speed, and pixel information can be transmitted at the same or different rates in the row and column directions. The driving circuit can control the charge in the row and column directions and drive the charge to transfer the charge respectively along the row and column directions.

[0052] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0053] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

[0054] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

[0055] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. Aerial camera timing pulse generator supporting multi-DOF image motion compensation function, characterized in that: include: The bus and interface control module is used to communicate with the external controller, receive control instructions and configuration data, and perform data transmission and instruction interaction with the lower-level chip through the communication interface; A pixel synchronization clock generating module, used for generating a pixel synchronization clock; An analog-to-digital conversion clock generation module is used to generate analog and digital conversion clocks; A reset pulse generating module, used for generating a reset clock for an output amplifier; A correlated double sampling clock generation module, used for generating a correlated double sampling clock; A horizontal charge transfer driving module, used for generating a driving clock for driving charge transfer in the horizontal direction; A vertical charge transfer driving module, used for generating a driving clock for driving charge transfer in the vertical direction; A front-end signal processing control signal generating module, used to generate a clamping control signal of a front-end signal processing circuit; A synchronization signal generating module, used for receiving external synchronization frames, line signals, external trigger signals, and generating image frames and line synchronization signals; The signal coupling and output module couples and processes the received signal and then outputs it.

2. The timing pulse generator for an aerial camera supporting a multi-DOF image motion compensation function according to claim 1, characterized in that: The bus and interface control module are respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module; The signal coupling and output module is respectively connected to the pixel synchronization clock generation module, the analog-to-digital conversion clock generation module, the reset pulse generation module, the correlated double sampling clock generation module, the horizontal charge transfer drive module, the vertical charge transfer drive module, the front-end signal processing control signal generation module, and the synchronization signal generation module.

3. The timing pulse generator for an aerial camera supporting a multi-DOF image motion compensation function according to claim 1, characterized in that: The horizontal charge transfer driving module drives the horizontal charge to transfer, compensating for the image shift of the aerial image in the horizontal direction of the detector; The vertical charge transfer driving module drives the vertical charge to transfer, thereby compensating for the image shift of the aerial image in the vertical direction of the detector.

4. The timing pulse generator for an aerial camera supporting a multi-DOF image motion compensation function according to claim 3, characterized in that: The detector includes pixels arranged in rows and columns; The pixels have respective charge moving speeds, and transmit pixel information at the same or different rates in the row and column directions; The driving circuit controls the charges in the row and column directions so that the charges are driven along the row and column directions respectively to transfer the charges.

5. The timing pulse generator for an aerial camera supporting a multi-DOF image motion compensation function according to claim 1, characterized in that: The aerial camera timing generator is developed through an FPGA development board and has a modular design.

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