Start atlas matching method of cross-discontinuous field of view fusion

A matching method and discontinuous technology, applied in the field of star map matching and identification, can solve problems such as poor star-gazing conditions, and achieve the effect of improving efficiency and robustness

Inactive Publication Date: 2019-01-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The purpose of the present invention is to provide a star map matching method for fusion across discontinuous fields of view for hypersonic speeds in the atmosphere and the harsh star-viewing conditions of aerospace ve...

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  • Start atlas matching method of cross-discontinuous field of view fusion
  • Start atlas matching method of cross-discontinuous field of view fusion
  • Start atlas matching method of cross-discontinuous field of view fusion

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Embodiment Construction

[0014] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the present invention provides a star map matching method fused across a discontinuous field of view, comprising the following steps:

[0016] 1. According to the installation relationship of the dual field of view star sensor, determine the conversion matrix between the star sensor coordinate systems (based on the single optical head probe); determine the angular distance between the optical probe boresight points;

[0017] 1.1: Define the star sensor coordinate system as the s system, where the projection center O is the coordinate origin, the visual axis direction of the optical probe is the Z axis, and the two sides parallel to the rectangular photosensitive surface are the X and Y axes. That is, for a dual field of view star sensor, there exists s 1 and s 2 Two star sensor coo...

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Abstract

The invention discloses a start atlas matching method of cross-discontinuous field of view fusion. The method comprises the following steps: determining a conversion matrix between a star sensor coordinate systems; determining an angular distance between optical probe visual axis orientations; screening fixed stars in an astronomy fundamental star catalogue by utilizing an apparent magnitude equal-threshold filter method to acquire an alternative fixed star set; computing an annular fixed star screening region based on a dual-visual axis installation relation, traversing and screening all fixed stars in the alternative fixed star set to acquire a navigation fixed star set, and establishing a dual field of view adaptive all-day navigation start catalogue according to grouped storage principle; receiving a dual field of view start atlas processed by the start sensor to acquire a virtual discontinuous field of view star atlas under the same visual axis; traversing all start points in a large field of view star atlas to construct a navigation triangle feature set; performing triangle start atlas matching by using the navigation star catalogue and the navigation triangle feature, and outputting an identification result. Through the method disclosed by the invention, the problems that the visible star is less and the geometric configuration is bad are remedied by utilizing multiple small fields of view synthesis; the navigation star catalogue is constructed in a targeted way, and the efficiency and the robustness of the algorithm are enhanced.

Description

technical field [0001] The invention belongs to the technical field of star map matching and recognition, and in particular relates to a star map matching method based on fusion across discontinuous fields of view. Background technique [0002] Star map matching is one of the key technologies of celestial navigation, and it is a reliable and effective way to realize the integrated autonomous flight of current and future aerospace vehicles. At present, large field of view star map matching technology is widely used in spacecraft, but in the field of aviation, limited by the characteristics of aircraft and stargazing conditions, it is mostly applied in small field of view. [0003] With the development of new hypersonic and aerospace-integrated vehicles, the aero-optical effect in the ultra-high-speed flight environment has put forward new requirements for the application of star map matching in the atmosphere. Due to the research fact that the aero-optical effect is greatly ...

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 曹宇轩王融刘建业熊智景羿铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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