Navigation database building method applicable to high level background star pattern recognition

Abstract

The invention relates to a navigation database building method applicable to high level background star pattern recognition, and belongs to the technical field of navigation database building. According to the method, on the basis of obtaining a visual axis realizing uniform unit spherical surface distribution, navigation stars and navigation triangles are selected, so that the navigation stars and the navigation triangles distributed as uniformly as possible in aspects of positions and energy in a celestial sphere can be obtained; each navigation star is enabled to have a chance to construct the navigation triangles; the data redundancy and the regional hollowness caused by energy instability, nonuniform distribution and a huge number of fixed stars and triangles are avoided; and the effectiveness of a star pattern recognition algorithm is ensured.

Description

technical field [0001] The invention relates to the technical field of navigation database construction, in particular to a navigation database construction method suitable for high-background star map recognition. Background technique [0002] The star sensor is a high-precision attitude sensor, which obtains the inertial attitude angle or quaternion pointed by the boresight through imaging and identification of stars. Navigation star is the basic reference data for star map recognition and attitude calculation. The construction of navigation database is closely related to the recognition algorithm, and directly affects the performance of image recognition algorithm and the accuracy of attitude calculation. [0003] Existing star sensors are mostly used on satellite platforms, and their application environments have the characteristics of dark background, less interfering stray light, abundant observable star resources, and large camera observation field of view. Under thi...

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Problems solved by technology

In view of the above problems, an optical imaging system with a small field of view (5.86°×5.86° square) and a high-sensitivity CCD camera ICCD in the near-infrared detection band is designed as a star sensor. On this basis, image matching and attitude calculation are selected and constructed The reference navigation stars and navigation database are faced with the following problems: (1) The detection magnitude is high and there are many dark stars. If no screening is added, the capacity of the database composed of navigation stars and navigation triangles will increase sharply, making it impossible to realize engineering applications; (2) the field of view Small, with few bright stars, it is not easy to select the navigation triangle for star map matching; (3) Near-infrared band detection requires instrument magnitude correction to meet the needs of actual observation; (4) ICCD imaging background noise Large, non-Gaussian distribution, star point imaging energy is unstable, making it difficult to select navigation stars

[0005] The existing navigation star and navigation triangle selection methods can no longer solve the above problems, and it is necessary to design a navigation star and navigation triangle selection method with moderate quantity, good uniformity, small redundancy, suitable for engineering applications, and strong versatility, and here The way to construct the navigation database based on

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