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A Real-time Filtering Method of Star Map Background in Daytime Environment

A star map and environment technology, applied in image enhancement, image data processing, processor architecture/configuration, etc., can solve the problems of unable to filter out the background to highlight star points, poor real-time performance, etc., to achieve high use value, fast speed, and economical The effect of hardware resources

Active Publication Date: 2021-07-13
BEIJING INST OF CONTROL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a real-time filter method for star points in a daytime cloudy environment, and to solve the problem that the star sensor cannot be filtered when it is working in the atmosphere and is disturbed by sky background radiation and clouds. In addition to highlighting the star point in the background and poor real-time performance

Method used

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  • A Real-time Filtering Method of Star Map Background in Daytime Environment
  • A Real-time Filtering Method of Star Map Background in Daytime Environment
  • A Real-time Filtering Method of Star Map Background in Daytime Environment

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Embodiment

[0102] Assume that the size of the original star map is 1024×1024, the input of the star map is 100M pixels / s, the clock of the filtering part is 50MHz, the filtering structure element is 5×5, and the data in two structure elements (m=2) are processed in each clock cycle.

[0103] The original star map cache space size is 5*1024 pixel cache units; the minimum star map cache space size is 5*1024 pixel cache units; the column minimum value cache space is 6 pixel cache units; the column maximum value is 6 pixel cache units unit; 16 2-input comparators are required for the minimum value comparator; 16 2-input comparators are required for the maximum value; 2 subtractors are required for the difference; the filtering processing speed is 100M pixels / s, matching the speed of the input star map, The filtered output can be realized while collecting the original star map.

[0104] To sum up, the present invention uses (2n+1)×(2n+1) structural element as the basic unit to perform real-ti...

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Abstract

The present invention provides a real-time filtering method for star map background in daytime environment, the method uses (2n+1)×(2n+1) structural element as the basic unit to perform real-time filtering on limited row (2n+1) star map data For processing, first find the minimum star map, then find the maximum star map, and finally make a difference to complete the filtering; the whole process is carried out in an assembly line, with simple calculation rules and high parallelism. The speed is fast, the real-time performance is good, and it has high use value; especially, the process of calculating the maximum value star map is carried out in a parallel hierarchical pipeline, first calculating the maximum value in the column direction, and then calculating the maximum value in the row direction, and the column or row direction respectively Find the maximum value for (2n+1) data, with high parallelism, small amount of calculation, and fast speed.

Description

technical field [0001] The invention relates to the field of star map preprocessing of near-ground platforms such as airplanes, missiles, ships and near-space vehicles, in particular to background real-time filtering of star sensors in daytime cloudy environments. Background technique [0002] The star sensor is a high-precision optical attitude measurement sensor based on the star. It has the advantages of high attitude measurement accuracy and high reliability. It has been widely used in the attitude measurement and control systems of satellites, spacecraft and other spacecraft. At present, most of the typical star sensors work in the cold and dark background. Faced with the all-day navigation requirements of aircraft, missiles, ships and other platforms in the atmosphere and near-Earth space, due to the strong sky background light under daytime conditions, the stars will be flooded. Under complex backgrounds such as clouds, traditional star-sensitive filtering methods can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/20G06T5/10
CPCG06T1/20G06T5/10
Inventor 李全良李晓徐卿张笃周王艳宝王立曹中祥
Owner BEIJING INST OF CONTROL ENG
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