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Method for rapidly searching navigation star catalogue

A technology of navigation stars and star sensors, which is applied in the field of aerospace, can solve the problems of reduced search efficiency, complex axis and boundary point direction vectors, and increased storage capacity, so as to achieve non-redundant storage and reduce star table storage Capacity, the effect of fast retrieval

Active Publication Date: 2012-06-06
TSINGHUA UNIV
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Problems solved by technology

According to the given boresight pointing, find the corresponding quadrilateral area that needs to be retrieved. The problem with this method is that each star is stored in more than one sky area, which causes a sharp increase in storage capacity, which in turn leads to a decrease in search efficiency
The advantage of this kind of partition is that it realizes the uniform and non-overlapping division of the sky area. It is currently a better way to divide the sky area. The disadvantage is that each partition record includes adjacent partition information, so that redundant information on storage appears. , and it is more complicated to calculate the direction vector of the central axis and boundary point of each sub-block

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  • Method for rapidly searching navigation star catalogue
  • Method for rapidly searching navigation star catalogue
  • Method for rapidly searching navigation star catalogue

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Embodiment Construction

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0033] A method for quickly searching the navigation star catalog includes the following steps,

[0034] The first step is to directly use the original right ascension and declination circle of the celestial sphere to divide the sky area;

[0035] The second step is to calculate the right ascension and declination span (C J , C w ), C J Is the right ascension span of the area covered by the place, C w Is the declination span of the area covered by the visual field, C J ∈(C J0 -arctan(tanθ / cos(C w0 +R)), C J0 +arctan(tanθ / cos(C w0 +R))), C w ∈(C w0 -R, C w0 +R), where C J0 Is the right ascension coordinate of the star sensor's initial point of view axis, C w0 Is the initial declination coordinate of the star sensor's visual axis, R is the radius of the star sensor's circular field of view, and θ is the declination value C w0 The visual axis of +R points to half of th...

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Abstract

The invention relates to a method for rapidly searching a navigation start catalogue, which comprises the steps of: firstly, dividing a sky region by directly using an original right ascension and declination circle of a celestial sphere; secondly, calculating a right ascension and declination span range of a region covered by a star sensor according to the direction of a visual axis, and searching the navigation star catalogue in the right ascension and declination span range to obtain a navigation star in a visual filed; thirdly, spreading the celestial sphere into a two-dimensional plane with 180*360 to obtain a two-dimensional array of celestial sphere navigation star distribution; and fourthly, compressing the two-dimensional array into a one-dimensional array through two stages of compressions and then indexing the one-dimensional array by using a hash technology. The navigation star is subjected to no redundancy storage by adopting the two stages of compressions and a Hash mapping technology, therefore, the invention realizes that the index time of the navigation star catalogue is 0(1), can be used for rapidly indexing the navigation star in the visual field of the star sensor from the navigation star catalogue when the given visual axis points 8, and has the characteristics of high indexing speed and high efficiency.

Description

Technical field [0001] The invention belongs to the field of aerospace technology and relates to a method for quickly searching a navigation star catalog. Background technique [0002] With the continuous development of autonomous navigation technology, the star sensor, as the optical attitude sensor with the highest attitude measurement accuracy, has developed rapidly in recent years. The star sensor uses the star as the reference object and uses accurate celestial body information to determine the attitude of the aircraft, which is an important means to realize the autonomous positioning and navigation of the spacecraft. The star sensor has the advantages of high accuracy, good autonomy, and reliable operation, and has a wide range of application prospects in various aircraft. The working principle of the star sensor is: use the CCD image sensor to capture the starry sky image within the current field of view. The image is subjected to the star point extraction algorithm to ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/24
Inventor 梁斌杨君宋靖雁张涛朱海龙宋亮亮
Owner TSINGHUA UNIV
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