Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR

Yunhua Zhang; Xiaojin Shi; Jingshan Jiang

doi:10.1117/12.737621

18 October 2007 Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR

Yunhua Zhang, Xiaojin Shi, Jingshan Jiang

Proceedings Volume 6746, SAR Image Analysis, Modeling, and Techniques IX; 67460N (2007) https://doi.org/10.1117/12.737621
Event: SPIE Remote Sensing, 2007, Florence, Italy

Abstract

This paper introduces a simple method to obtain a much higher resolution than the designed resolution in both azimuthal and rang directions for SAR by synthesizing the data taken by repeat passes without increasing any complexity in SAR hardware and satellite platform. The basic idea of the method is to firstly establish the equivalence between the signal models of repeat pass SAR signals in both azithumal and range directions and the signal model of stepped frequency chirp signals (SFCSs) when some conditions are presumed, i.e. for range direction, interferometric condition is required and for azimuthal direction, a small squint angle increase between repeat passes is required, and then using the already proposed method for SFCSs compression to process the data of repeat passes. In the course of processing, each observation in range direction or in azimuthal direction is treated as a subchirp in SFCSs. The major facts affecting the final resolution one could get are investigated and found. They are the relative range measurement accuracy and the absolute squint angle measurement accuracy between repeat passes. Detailed derivations and simulations are presented to show the effectiveness of the method.

Citation Download Citation

Yunhua Zhang, Xiaojin Shi, and Jingshan Jiang "Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR", Proc. SPIE 6746, SAR Image Analysis, Modeling, and Techniques IX, 67460N (18 October 2007); https://doi.org/10.1117/12.737621

ACCESS THE FULL ARTICLE

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