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Method for accurately obtaining star image sidereal time

A star map and accurate technology, applied in the field of aerospace, can solve inaccurate problems, achieve the effect of avoiding inaccuracy, broadening the method and application range, and improving the locking accuracy

Active Publication Date: 2013-03-20
BEIJING INST OF CONTROL ENG
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, once the microsecond time register overflows, the hardware-locked star time that is placed in the star time register for software use is inaccurate

Method used

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  • Method for accurately obtaining star image sidereal time

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Embodiment Construction

[0013] Below in conjunction with embodiment and accompanying drawing, the present invention will be described in further detail:

[0014] Star map: a set of data sent by the APS star sensor and received by the data acquisition unit alone;

[0015] Star time: the time information on the single machine of the data acquisition unit, which is composed of whole second star time and microsecond star time;

[0016] Star map star time: identifies the time information when the star map is received, which is composed of star map full second star time and star map microsecond star time;

[0017] Time calibration: There are multiple stand-alone devices on the satellite. In order to keep the time consistent, one system broadcasts the current star time, and other devices receive it and synchronize the star time;

[0018] Whole second star time register: store the current whole second star time information of the data acquisition unit stand-alone, 32 bits;

[0019] Microsecond satellite ti...

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Abstract

The invention discloses a method for accurately obtaining star image sidereal time. When a microsecond sidereal time register overflows, star image sidereal time information locked through hardware and deposited in a star image second sidereal time register and a star image microsecond sidereal time register is not directly used through software, but the value of the star image second sidereal time register and the value of the star image microsecond sidereal time register are read through the software, second sidereal time and microsecond sidereal time are obtained, and then the value of a microsecond overflow flag register is read. Whether the second sidereal time and the microsecond sidereal time need correction is judged, if the correction is not needed, the second sidereal time and the microsecond sidereal time directly serve as star image second sidereal time and star image microsecond sidereal time; and otherwise, corrected second sidereal time and corrected microsecond sidereal time serve as the star image second sidereal time and the star image microsecond sidereal time. The method is not affected by interruption of a processor and overflowing of the microsecond sidereal time register, and therefore locking accuracy of star image time is improved.

Description

technical field [0001] The invention relates to a method for obtaining star time at a star map, in particular to a method for accurately obtaining star time at a star map, and belongs to the field of aerospace technology. Background technique [0002] The data acquisition unit stand-alone (hereinafter referred to as DSU, or stand-alone) receives the star map data of the APS star sensor, and then adds the frame header, star map star time, DSU status word and checksum, and then repackages and sends it to the digital transmission subsystem . Under normal operating conditions, when the star map arrives, the hardware of the DSU receives the star map, and at the same time latches the values ​​of the current full-second star time register and microsecond star time register, and places them in the star map full-second star time register and star map microsecond star time register. In the time register, it is used for reading when the on-board software packs data. However, once the...

Claims

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Application Information

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IPC IPC(8): G05B19/042
Inventor 郝王松陈超郭兵文亮李庆施蕾
Owner BEIJING INST OF CONTROL ENG
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