Mr. Zhang Han Profile

Zhang Han

at Beijing Institute of Space Long March Vehicle

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 23 January 2023 Paper

Centroid and grayscale reconstruction algorithm for infrared point targets

Jianhua Li, Feng Xue, Han Zhang, Lu Gao, Jiaqi Liu

Proceedings Volume 12557, 1255727 (2023) https://doi.org/10.1117/12.2651982

KEYWORDS: Target detection, Sensors, Reconstruction algorithms, Infrared radiation, Infrared detectors, Signal detection, Point spread functions

Read Abstract +

Improving the centroid and grayscale extraction accuracy of point targets is of great significance to the long distance detection system. There is a drop in centroid accuracy due to pixel sampling. For point targets, due to the small number of target pixels, the positioning accuracy is generally sub-pixel, and the use of optical dispersion to increase the number of target point pixels will reduce the signal-to-noise ratio of the point target, thereby reducing the detection distance of the system. In addition, there is a gap between the pixels of the infrared detector, and the grayscale response of the detector cannot reflect the real radiation intensity of the target. This paper simulates the point spread function based on the Gaussian function .The four parameters(the center coordinate, the width and the peak value) of the Gaussian function are estimated by a proposed optimization algorithm based on the obtained grayscale information of the point target. The results show that the grayscale extraction error is reduced from 35% of the grayscale summation algorithm to less than 10%, and the centroid error is also improved compared with the traditional centroid calculation algorithm.

Proceedings Article | 23 January 2023 Paper

Space target optic radiation flux simulation

Zhang Han, Li Jianhua

Proceedings Volume 12557, 125572A (2023) https://doi.org/10.1117/12.2652028

KEYWORDS: Solar radiation, Solar radiation models, Heat flux, Sun, Spherical lenses, Reflection, Radiation effects, Data modeling, Optical simulations, Black bodies

Read Abstract +

The target will be affected by the solar radiation, the earth radiation and the earth's reflected solar radiation during the flight. Due to the closeness of the earth to the target, the spatial position of the target has a great influence on the received radiative heat flux. At present, in many studies on the radiation characteristics of the target, researchers regard the earth as a black body with uniform temperature for equivalent replacement, which will cause certain errors in the calculation results. Therefore, based on the radiation transfer theory and spherical model, this paper analyzes the spatial position relationship between the target and the earth and the sun under different attitudes, calculates the angular coefficient relationship between solar radiation, earth radiation and the earth's reflected solar radiation, and build a simulation model of heat flux received by space target. The simulation results show that for the shadow environment, the target is only affected by the radiation of the earth. The model constructed in this paper can achieve refined modeling of the earth with higher accuracy than traditional methods. For environments with solar radiation, although the introduction of the sun compresses the effect of Earth's radiation, the effect of Earth's albedo needs to be considered in Earth modeling because the target receives a large amount of Earth-reflected solar radiation.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years