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Image time hack information generating system of space camera

An information generation, space camera technology, applied in the direction of timing pulses, electronic timers, radio-controlled timers, etc., can solve the problem of large camera time synchronization errors, changes, and inability to use high-precision timescales and platform timescales for time synchronization and other problems, to achieve the effect of high camera time synchronization accuracy and accurate and reliable correspondence.

Active Publication Date: 2014-05-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The present invention aims at the plane positioning accuracy, elevation accuracy or attitude measurement accuracy of the space camera is affected by the camera time synchronization accuracy, while the existing method has a relatively large camera time synchronization error and changes greatly with the working sequence of the camera controller, and cannot use high To solve problems such as precision time scale and platform time scale, provide a space camera image time synchronization information generation system

Method used

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  • Image time hack information generating system of space camera
  • Image time hack information generating system of space camera
  • Image time hack information generating system of space camera

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specific Embodiment approach 1

[0028] Specific implementation mode one, combination Figure 1 to Figure 4 In this embodiment, the image timing information generation system of a space camera includes an asynchronous serial communication interface chip 10, a GPS second pulse level conversion chip 20, a frame / line synchronization level conversion chip 30, a crystal oscillator 40, and image timing information generation. FPGA50; the camera controller of the space camera sends the high-precision time stamp, platform time stamp and polling timing information instructions to the image timing information generation FPGA50 through the asynchronous serial communication interface chip 10; the image timing information generation FPGA50 receives the round After querying the timing information instruction, the latched image timing information is sent to the camera controller through the asynchronous serial communication interface chip 10; the image timing information generation FPGA 50 processes and combines the high-prec...

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Abstract

The invention provides an image time hack information generating system of a space camera, and relates to the space camera. The problems that in an existing method, the errors of time synchronization of the camera are large and vary greatly along with the operation time sequence of a camera controller, and high precision time scales and platform time scales can not be used for conducting time hack are solved. The image time hack information generating system of the space camera is composed of an asynchronous serial communication interface chip, a GPS pulse per second level switch chip, a frame / line synchronization level switch chip, a crystal oscillator and an image time hack information generation FPGA. A state machine is used for processing high-precision time scales and platform time scales, image time hack information data are generated in a pure hardware time sequence circuit mode, and it is guaranteed that the corresponding relation of line numbers and time codes in the image time hack information is accurate and reliable through latching twice. The image time hack information generating system of the space camera can achieve higher camera time synchronization precision, when a GPS and related receiving equipment break down, self-time keeping can be achieved, the platform time scales can be used for conducting time hack, and it is guaranteed that the generated image time hack information can still maintain certain precision.

Description

Technical field [0001] The present invention generally relates to a space camera, and more specifically, to an image timing information generation system of the space camera. technical background [0002] Space cameras include reconnaissance cameras for earth observation, space stereo mapping cameras and star cameras for star observation. The space camera uses the spacecraft as the observation platform. Because the position and attitude of the spacecraft are constantly changing during the flight, if the time of the camera cannot be synchronized with the spacecraft platform and other units of the spacecraft, it will be difficult to achieve the required plane positioning accuracy and elevation accuracy. Or attitude measurement accuracy. [0003] The space camera needs to collect image timing information during the photography process. The image timing information includes the line / frame number of the image and the time code corresponding to the start time of exposure of the line / fra...

Claims

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Application Information

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IPC IPC(8): G04R20/04G04G3/00
Inventor 武星星刘金国周怀得
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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