Fast tracting method of star sensor

A star sensor and star tracking technology, applied in the field of astronomical navigation, can solve the problems of high computational overhead, meaningless, and unnecessary in real-time implementation, and achieve the effects of shortening matching time, computing time, and matching times.

Inactive Publication Date: 2007-01-17
BEIHANG UNIV
View PDF2 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When searching, if the coordinate information of each star in the star catalog has to be calculated and compared to determine whether it satisfies the conditions for mapping to the field of view, then this process is very time-consuming
[0005] (3) In the process of matching and identification, the comparison between some distant stars is unnecessary
like figure 1 As shown, for star No. 5 in the cu

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fast tracting method of star sensor
  • Fast tracting method of star sensor
  • Fast tracting method of star sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] The adoption of the above three improvements greatly improves the speed of the existing tracking algorithm. In this regard, a simulation test was carried out on a Celeron 900(m) machine. The specific method of testing is as follows:

[0050] (1) The partition star table used in the simulation program is a partition star table that divides the sky into 486 blocks. The threshold δ for mapping is set to 13. Below are the results of the software simulation test.

[0051] (2) Set the initial attitude (pitch angle 70°, yaw angle 20°, roll angle 0°) and final attitude (pitch angle 80°, yaw angle 30°, roll angle 0°) of the star sensor. In the tracking process of the simulated star sensor from the initial attitude movement to the final state, there are 139 steps to track. Each step will generate a star map to simulate the star map collected by the star sensor according to the attitude of each step, and then use the reference star map of the previous frame to track and identi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the modification to the tracking method of the star tracker. The process includes: it gets the reference star map of the K+1 frame by the star mapping; the every star in the star map collected by the (K+1) frame is matched to the star in the reference star map of the K+1 frame; the character is to map the star by the threshold value mapping; while it searches the star by the zone catalogue; in the matching process, it arrays the sequence firstly then to match. The computing of the invention cost the short time, so it has the high speed.

Description

technical field [0001] The invention belongs to the technical field of astronomical navigation, and relates to the improvement of a tracking method for a star tracker. Background technique [0002] The emergence of star sensor technology has opened up a new way for the attitude measurement of spacecraft. The star sensor has two working modes: initial attitude acquisition and tracking mode. When the star sensor is working, it enters the tracking mode after the initial attitude is obtained through the all-sky star map recognition. Most of the working time of the star sensor is in the tracking mode, and the fast star tracking method can improve the overall performance of the star sensor. The current star tracking methods mainly include two tracking methods: tracking window method and matching recognition method. Among them, the tracking method of matching identification method is adopted because it is simple, effective and fast. The matching identification method is further...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01B11/03G01B21/04B64G3/00G01C21/02
Inventor 江洁张广军李霄魏新国
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap