Unlock instant, AI-driven research and patent intelligence for your innovation.

Space target key feature identification method based on luminosity signal

A space target and identification method technology, applied in the key feature identification of space target based on photometric signal, and the field of space information detection, can solve the problems of long distance, low imaging resolution, difficulty in effectively obtaining space target features, etc.

Pending Publication Date: 2021-06-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The distance of ground-based observation is relatively long, the imaging resolution of the optical system is low, and it is easily affected by uncontrollable factors such as illumination and non-cooperative target attitude and orbit changes. At this time, it is usually difficult to effectively obtain the characteristics of space targets. There are certain limitations

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
  • Space target key feature identification method based on luminosity signal
  • Space target key feature identification method based on luminosity signal
  • Space target key feature identification method based on luminosity signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Prediction of space target position and attitude

[0037] If the gravitational influence of other celestial bodies is ignored, and only the perturbation effect of the solar radiation pressure on the orbit of the space object is considered, the acceleration expression of the space object is

[0038]

[0039] In the formula, a per is the acceleration caused by solar radiation pressure, μ is the gravitational constant of the earth, and r is the distance from the space object to the center of the earth.

[0040] A quaternion is defined as

[0041] q=[q 0 mu T ] T

[0042] Among them, q 0 and μ are defined as

[0043]

[0044]

[0045] In the formula, ν is the Euler rotation angle, is the Euler axis of rotation.

[0046] Most space targets do not have the ability to adjust attitude and belong to the spin stabilization system. The spin-stabilized space target rotates at a constant speed around a fixed rotation axis, and the motion update model of its a...

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 discloses a spatial target key feature identification method based on a luminosity signal, and the method comprises the following steps: 1, setting the initial state of a spatial target, predicting the position of the spatial target based on a finite element model and a solar radiation pressure model, and estimating the attitude of the spatial target according to an attitude control mode; 2, analyzing the surface element visibility of the surface of the space target; 3, predicting a space target luminosity signal based on a bidirectional reflectivity distribution function, and correcting the space target state predicted in the step 1 according to an actual observation numerical value; 4, estimating an observation value of the corrected parameter based on the space target state in the step 3, and correcting an over-fitting phenomenon possibly existing in the step 3 by using an actual observation value; and 5, based on the space target parameters estimated in the step 4, repeating the step 1 to the step 4, updating and obtaining the position and the attitude of the space target, and achieving key feature identification of the space target.

Description

technical field [0001] The invention relates to the technical field of spatial information detection, in particular to the technical field of key feature identification of a spatial target based on a photometric signal. Background technique [0002] The orbital period of medium and high orbit satellites such as geosynchronous orbit satellites has a small difference from the earth's rotation period, and can stare at surface targets for a long time without background image motion, and accurately identify the working type and working status of space targets such as medium and high orbit satellites. Spatial information detection is of great significance. [0003] Because the ground-based optical system is not limited by space platform resources, it has better optical information acquisition and processing capabilities than the space-based optical system, and the cost of use is lower. It is the main means of space target monitoring. The distance of ground-based observation is re...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G01D21/02
CPCG06F30/23G01D21/02
Inventor 张寅郭鹏宇鲍广震马俊闫钧华智喜洋巩晋南
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS