Common-light-path and multi-view-field star sensor and star attitude measurement method thereof

Abstract

The invention provides a common-light-path and multi-view-field star sensor and a star attitude measurement method thereof. The common-light-path and multi-view-field star sensor shares one set of an optical system, an imaging unit and a data processing unit, wherein the optical system can be used for simultaneously observing three fixed stars in different sky regions; the imaging unit is used for simultaneously imaging the three fixed stars in the different sky regions and carrying out star map identification on imaged star points; the data processing unit is used for carrying out extraction of center-of-mass coordinates on the collected star points of the fixed stars, carrying out non-aligned revising on offsets of three view fields and finally finishing high-precision star attitude angle output. According to the common-light-path and multi-view-field star sensor, the problem that the measurement precision of a single-view-field star sensor along an optical axis direction is low can be effectively solved; meanwhile, the disadvantages that the weight, the power consumption and the volume are great, which are caused by the reason that a traditional multi-view-field star sensor adopts an optical system and an imaging system which are split, are overcome; three-axis high-precision measurement is realized and a light miniaturized design is also realized; the requirements on the high-precision attitude measurement by multiple satellite platforms can be met.

Description

technical field [0001] The invention relates to a common light path multi-field star sensor and a star attitude measurement method thereof. Background technique [0002] With the growing demand for high-precision attitude sensors in space, in order to obtain accurate attitude information, high-precision attitude measurement sensors must be used. The star sensor is currently the most accurate attitude measurement device in space applications, but its measurement accuracy along the optical axis of the optical system in the three measurement directions is an order of magnitude lower than that of the other two axes. It is difficult for the instrument to achieve three-axis simultaneous high-precision measurement. The conventional method to improve the measurement accuracy is to use the data fusion of multiple star sensors, or to use a multi-field star sensor system composed of multiple sets of optical systems and multiple sets of imaging units. Measurement, but it also brings p...

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Problems solved by technology

[0003] The invention provides a common optical path multi-field star sensor and its star attitude measurement method, which can effectively solve the problem of low measurement accuracy of single-field star sensors along the optical axis direction, and can also overcome the traditional multi-field star sensor. The sensor adopts the split optical system and imaging system to cause the disadvantages of weight, power consumption and large volume. While realizing three-axis high-precision measurement, it also realizes light and small design, which can meet the requirements of various satellite platforms. Accurate Attitude Measurement Requirements

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