Method for extracting fixed star image coordinates in real time based on field programmable gate array (FPGA)

A technology of star image coordinates and stars, which is applied in the field of real-time extraction of star image coordinates, which can solve the problems that cannot meet the high dynamic and high precision mode of star sensors.

Inactive Publication Date: 2013-02-27
HARBIN INST OF TECH
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of extracting star image coordinates by reading images from SRAM must utilize the gray value of the next column coordinates of the current image pixel and the gray value of the next row coordinates of the current column

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
  • Method for extracting fixed star image coordinates in real time based on field programmable gate array (FPGA)
  • Method for extracting fixed star image coordinates in real time based on field programmable gate array (FPGA)
  • Method for extracting fixed star image coordinates in real time based on field programmable gate array (FPGA)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] We choose a certain type of satellite star sensor for testing. The main parameters of the star sensor are as follows:

[0045] Field of view: 14×14

[0046] Star array: 1024×1024

[0047] Detection magnitude: 6th;

[0048] Star sensor FPGA model: ALTERA CycloneII EP2C8Q208I8

[0049] The main characteristic parameters of EP2C8Q208I8:

[0050] Logical unit: 8256

[0051] RAM: 165888 bits

[0052] PLL: 2

[0053] The maximum number of I / O used: 182

[0054] Star sensor FPGA operating frequency: input FPGA crystal oscillator frequency 20MHz, the operating frequency of the process of extracting star image coordinates after using phase-locked loop is 80MHz;

[0055] Star sensor processor operating frequency: 20MHz.

[0056] The method of extracting star image coordinates by software is compared with the method of real-time extraction of star image coordinates by FPGA, and the star sensor's star image coordinate extraction accuracy, data update cycle and other main i...

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 a method for extracting fixed star image coordinates in real time based on a field programmable gate array (FPGA). According to the method, fixed star imaging of a star sensor adopts a sub pixel technology, the center of mass of the fixed star image coordinates is acquired through a center-of-gravity method, and only a gray value of the previous column of coordinates of the current row of the current image pixels and a gray value of the previous row of coordinates of the current column are adopted in the process of extracting the fixed star image coordinates. According to the method, after analog/digital (A/D) conversion is completely changed into digital quantity, the fixed star image coordinates of the image are immediately extracted. Therefore, the process that the star map data is required to be read from a static random access memory (SRAM) in the process of extracting the traditional fixed star image coordinates is avoided in the process of extracting the fixed star image coordinates. According to the method, the process of saving a star map to the SRAM and the process of extracting the fixed star image coordinates from the star map are completely parallel; and therefore, the time of extracting the fixed star image coordinates is reduced, the real-time property and the data updating rate are improved, and further the dynamic performance of the star sensor is further improved.

Description

technical field [0001] The invention relates to a method for realizing real-time extraction of stellar image coordinates based on FPGA. Background technique [0002] With the development of aerospace technology, star sensors, as a high-precision attitude measurement device, are more and more widely used in satellites and other spacecraft. The star sensor is mainly composed of an optical system, an image sensor circuit and a digital image processing system. The working principle of the star sensor is: the starlight emitted by the star is imaged on the photosensitive surface of the CCD through the optical system, the light energy of the starlight is converted into an analog electrical signal by the CCD signal detection circuit, and the analog signal processing unit amplifies, filters, After shaping and other processing, the analog-to-digital conversion unit performs analog-to-digital conversion and data acquisition. The data processing unit processes the digitized star map, ...

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): G01C11/04
Inventor 李葆华童浩王常虹陈希军
Owner HARBIN INST OF TECH
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