Method for determining exposure moment of star sensor data of satellite

A star sensor and exposure time technology, applied in the field of star sensors, can solve the problems of complex timing logic, unfavorable software structure design and timing analysis, and many interruptions of high-orbit satellites

Inactive Publication Date: 2013-04-03
BEIJING INST OF CONTROL ENG
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Problems solved by technology

[0004] However, for the application of high-orbit satellites, on the one hand, high-orbit satellites have not yet used GPS, let alone GPS second pulses; on the other hand, h

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  • Method for determining exposure moment of star sensor data of satellite

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Embodiment Construction

[0016] Such as figure 1 Shown, be the flowchart of the inventive method, its main steps are as follows:

[0017] (1) Firstly, in the initialization of the on-board computer, the software configures the existing hardware counter as a pulse generator, the counting time value is decremented and automatically loaded after being reduced to 0, and the PPS pulse is generated regularly and sent to the star sensor. The time interval is configured as T according to the actual requirements, as the synchronous pulse signal of the star sensor, and the pulse signal will be used as the time basis for the output datation of the star sensor. For the configuration method of the hardware counter, please refer to the operation manual of the INTEL series chip 82C54.

[0018] (2) In each control cycle of the on-board computer, the absolute star time Ta can be obtained first, and the on-board computer software periodically communicates with the star sensor to obtain the attitude data from the star ...

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Abstract

The invention provides a method for determining an exposure moment of star sensor data of a satellite. The method comprises the following steps that: (1) a hardware counter on a spaceborne computer is configured to be a pulse generator through software, PPS pulses are generated at regular time and sent to the star sensor to be used as synchronization pulse signals; (2) countdown of a pulse generator is periodically processed, and an interval between a PPS pulse emission moment and a current moment is calculated based on an obtained count value; and (3) the star sensor records time datation of an exposure moment of current data relative to current PPS pulse time, the time datation is transmitted as a part of data to the spaceborne computer, the spaceborne computer respectively reads star time at the current moment and a count value of the pulse generator when using the star sensor data for attitude determination, and the exposure moment of the star sensor data can be accurately obtained according to the datation of the star sensor data and the number of PPS pulses. With the method provided by the invention, the exposure moment of the data of the star sensor can be accurately obtained without addition of hardware on the spaceborne computer.

Description

technical field [0001] The invention relates to a star sensor, in particular to a communication and data processing method of the star sensor for high-orbit satellites. Background technique [0002] Star sensors are currently the most accurate attitude measurement components in satellite applications. So far, star sensors have been widely used in low and medium orbit satellites. The high accuracy of star sensor attitude measurement depends on the measurement accuracy of the star sensor itself on the one hand, and on the accuracy of the satellite attitude calculation method on the other hand. Since the attitude determination of the star sensor mainly depends on the star image information of the lens exposure imaging, the attitude data acquired during the communication process between the computer on the star and the star sensor must correspond to the attitude at a certain moment before the current time, and this time is is the central moment of image exposure, and the diffe...

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Application Information

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IPC IPC(8): G01C11/00G01C21/02
Inventor 周中泽党纪红杜建伟索旭华陈朝晖葛莹王晶李振松刘建军刘新彦
Owner BEIJING INST OF CONTROL ENG
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