Fast star map identification method of star sensor

A star sensor and star map recognition technology, applied in the field of space science, can solve the problems of reducing recognition time and limitations, and achieve the effect of improving recognition rate, reducing recognition time, and avoiding all-sky search

Inactive Publication Date: 2011-07-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of traditional methods to reduce the recognition time and improve the recognition rate must be limited.

Method used

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  • Fast star map identification method of star sensor
  • Fast star map identification method of star sensor
  • Fast star map identification method of star sensor

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Embodiment 1

[0034] Example 1: Combining figure 2 , the present invention a kind of fast star pattern recognition method of star sensor, the steps are as follows:

[0035] Step 1: While obtaining a complete star map, use the gyro combination system to obtain the rough attitude of the current star sensor;

[0036] Step 2: The star sensor uses the coarse attitude to search for all the stars in the field of view from the star catalog, and uses the following formula (1) and formula (2) to calculate the possible positions of all the stars in the field of view in the image plane;

[0037] x = cos δ sin ( α - A ) sin δ sin D + cos δ cos D cos ...

Embodiment 2

[0050] Example 2: Combining Figure 3-Figure 7 , select a certain type of satellite star sensor for the test, the main parameters of the star sensor are as follows:

[0051] Field of View: 20°×20°

[0052] Star array: 1024×1024

[0053] Detection magnitude: 5.5;

[0054] Star sensor processor operating frequency: 40MHz;

[0055] Exposure time: 100 milliseconds.

[0056] Using the traditional star map identification method and the identification method of the present invention, the main indicators of star image coordinate extraction time, star image identification time and identification rate of the star sensor are tested.

[0057] ①Star image coordinate extraction time and star image recognition time

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Abstract

The invention provides a fast star map identification method of a star sensor, which avoids all-celestial sphere search, reduces the identification time and improves the identification rate. The method comprises the following steps: obtaining a complete star map, and obtaining the current rough gesture of the star sensor by use of a gyroscope combination system; searching all fixed stars in the viewing field from a star table by use of the rough gesture through the star sensor, and calculating possible positions of all fixed stars in the viewing field in an image plane; scanning a small area of the star map centered on the positions, and extracting the star image coordinates of a corresponding observation star; identifying the extracted observation star by use of all fixed stars in the viewing field; and sending the identification result to a gesture calculation module which calculates the current gesture of the star sensor. According to the invention, possible fixed stars in the viewing field of the star sensor are predicted by use of the sensor information, and only by scanning the possible position range in the star map, the star image coordinates of the observation star can be extracted from the star map, thereby avoiding the process of scanning the entire star map; and moreover, as all-celestial sphere search is avoided, the identification time is reduced, and the identification rate is improved.

Description

(1) Technical field [0001] The invention relates to space science, in particular to a fast star pattern recognition method for a star sensor. (2) Background technology [0002] The study of star map recognition began in 1969. During the Apollo missions 15, 16, and 17, the outline of the moon was measured with a laser altimeter, and the star sensor was used to determine the direction of the laser beam. In the working process of the star sensor, it is necessary to process tens of thousands of star images (Star Images) taken by the star camera on the ground. It is very difficult to process tens of thousands of star images by manual methods. This task led Junkins et al. to design a general sense Airborne (on-board) star pattern recognition method. Early star map recognition algorithms mainly include Direct Match Technique, Angular Separation Match Technique, Phase Match Technique and Discrete Attitude Variation Technique, etc. Van Bezooijen proposed a master star identificatio...

Claims

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Application Information

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IPC IPC(8): G01C21/02
Inventor 李葆华陈希军温奇咏李清华
Owner HARBIN INST OF TECH
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