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Dynamic exposure time adjusting method for APS (active pixel sensor) star sensor

An exposure time, star sensor technology, used in instrumentation, measurement devices, mapping and navigation, etc., to achieve the effect of enhancing flexibility and scalability

Active Publication Date: 2015-04-29
BEIJING INST OF CONTROL ENG
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Problems solved by technology

The disadvantage of this method is that it can only set the exposure time adjustment range less than 65ms, and the inherent delay during exposure adjustment requires one frame of image time

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  • Dynamic exposure time adjusting method for APS (active pixel sensor) star sensor
  • Dynamic exposure time adjusting method for APS (active pixel sensor) star sensor
  • Dynamic exposure time adjusting method for APS (active pixel sensor) star sensor

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Embodiment Construction

[0029] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] A kind of APS star sensor dynamic exposure time adjustment method, its steps are as follows:

[0031] (1) Combined with the characteristics of the 4T image sensor, the rolling shutter exposure method based on the behavior-based exposure unit is introduced. The size of the image sensor array is 1024×1024, the readout time of a single pixel is 80ns, and the exposure unit is based on the readout time of one row, and the time is T=82us.

[0032] (2) According to actual needs, design the exposure time gear. The currently designed gears are 13 gears, namely 20ms, 30ms, 40ms, 50ms, 60ms, 70ms, 80ms, 85ms, 100ms, 125ms, 200ms, 250ms and 500ms. According to the 13 exposure time slots, determine the list of basic exposure lines and idle exposure lines, as shown in Table 1:

[0033] Table 1 List of the number of basic exposure lines and...

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Abstract

The invention discloses a dynamic exposure time adjusting method for an APS (active pixel sensor) star sensor. The method comprises the following steps: (1), the size of a 4T image sensor area array is set, and the time Tus for reading one line is taken as the basic exposure unit; (2), an exposure time gear register is arranged in an FPGA (field programmable gate array), and N-gear exposure time is set; (3), according to a new exposure time gear written by a processor, a corresponding exposure adjusting formula is determined, exposure idle lines and read idle lines are obtained through calculation, read and exposure operation is controlled by switching on and off a pixel charge transfer switch in one-line time, the exposure operation is not performed when exposure is in an idle line, and the read operation is not performed when read is in an idle line; after exposure of the idle lines is finished, a rolling exposure pipeline at a new exposure time gear is entered, and setting of the new exposure time gear is finished. Seamless and dynamic adjustment of multiple-gear exposure time can be realized, the exposure pipeline is not interrupted during dynamic adjustment of the exposure time, and the data read time interval is reduced.

Description

technical field [0001] The invention relates to a method for adjusting the dynamic exposure time of an APS star sensor, which is suitable for the field of star sensors used in space vehicles. Background technique [0002] The star sensor is an optical imaging sensor used for high-precision measurement of space attitude. When the star sensor is working in orbit, the method of matching the stellar photoelectric imaging of the sensor's field of view with the local sky area or the whole celestial star map is used to determine the direction of the star sensor's optical axis in the inertial space. The transformation relationship of the attitude coordinate system determines the attitude of the satellite. Star sensors have the characteristics of high precision and high reliability, and are widely used in aircraft platforms such as satellites, spacecraft and missiles. [0003] At present, many satellite platforms need to have on-orbit maneuverability. The biggest feature of satelli...

Claims

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 钟红军杨孟飞杨君卢欣王龙李晓
Owner BEIJING INST OF CONTROL ENG
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