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312960

Spaceborne synthetic aperture radar (SAR) motion compensation using autofocus

Article

Last updated: 23 Dec 2024

Subjects

-

Tags

Aerospace

Abstract

A common tool for remote sensing is Synthetic Aperture Radar (SAR).
It is a very confident compared to other forms of remote sensing since it
has the advantages of operating with high efficiency in all weather and
throughout the day. In ideal circumstances, the SAR platform travels
along a straight path at constant height and velocity. However, the
eccentric orbit of satellites does not support this idea leading to decrease
the quality of the focused image. This paper suggests a Phase Gradient
Autofocus (PGA) solution to be applied to Sentinel-1 data addressing
the SAR image-focus problem where space-variant motion defects could
not be disregarded, taking the biggest advantages of using satellite SAR
having access to actual data, such as Sentinel 1 level-0 and level-1 real
data obtained from the European Space Agency Copernicus website,
a free access hub for level-0 and level-1 data types. Furthermore, two
distinct measures are employed in the endorsement process. First,
measuring the contrast and entropy of the formatted image. Second,
four high power reflecting points in the scene area has been visually
inspected moreover assessing their amplitude response.The suggested
approach that employs PGA optimizes the image quality by attaining
improved entropy and contrast when compared to the original Sentinel-1
images.

DOI

10.21608/ejmtc.2023.213167.1258

Keywords

Chirp Scaling Algorithm (CSA), Image Quality, Phase Gradient Autofocus (PGA), Sentinel-1, Synthetic aperture radar (SAR)

Authors

First Name

Ahmed

Last Name

ELBohy

MiddleName

Salah

Affiliation

Avionics Department, Military Technical College

Email

a.bohy4phd@gmail.com

City

Cairo

Orcid

0000-0003-4199-9896

First Name

Ashraf

Last Name

Helmy

MiddleName

Khaled

Affiliation

National Authority for Remote Sensing and Space

Email

akhelmy@narss.sci.eg

City

Cairo

Orcid

-

First Name

Ahmed

Last Name

Mashaly

MiddleName

S

Affiliation

Avionics Department, Military Technical College

Email

mashaly@mtc.edu.eg

City

Cairo, Nasr City

Orcid

-

First Name

Ahmed

Last Name

Azouz

MiddleName

A

Affiliation

Avionics Department, Military Technical College

Email

a.azouz@mtc.edu.eg

City

Cairo Nasr City

Orcid

-

Volume

8

Article Issue

1

Related Issue

46799

Issue Date

2024-03-01

Receive Date

2023-06-03

Publish Date

2024-03-01

Page Start

61

Page End

68

Print ISSN

2357-0954

Online ISSN

2357-0946

Link

https://ejmtc.journals.ekb.eg/article_312960.html

Detail API

https://ejmtc.journals.ekb.eg/service?article_code=312960

Order

5

Type

Original Article

Type Code

307

Publication Type

Journal

Publication Title

Journal of Engineering Science and Military Technologies

Publication Link

https://ejmtc.journals.ekb.eg/

MainTitle

Spaceborne synthetic aperture radar (SAR) motion compensation using autofocus

Details

Type

Article

Created At

23 Dec 2024