SAR Models

Authored by: Kun-Shan Chen

Principles of Synthetic Aperture Radar Imaging: A System Simulation Approach

Print publication date:  December  2015
Online publication date:  January  2016

Print ISBN: 9781466593145
eBook ISBN: 9781466593152
Adobe ISBN:

10.1201/b19057-3

 Download Chapter

 

Abstract

Synthetic aperture radar (SAR) is a complex system that integrates two major parts: data collector and image formatter. In the stage of data collection, a radar transmits electromagnetic waves toward the target and receives the scattered waves [121]. The transmitted signal can be modulated into certain types, commonly linearly frequency modulated with pulse or continuous waveform, with or without coding [22]. The process involves signal transmission from the generator, through various types of guided devices, to the antenna, by which the signal is radiated into free space and then undergoes propagation. During the course of propagation, the signal may be attenuated before and after impinging upon the targets, experiencing certain degrees of absorption and scattering. The measured scattered signal made in bistatic or monostatic configurations is essentially in the time–frequency (delay time–Doppler frequency) domain. The role of image formatter is then to map the time–frequency data into the spatial domain in which the targets are located [5,15,16,2329]. The mapping from the data domain to the image domain, and eventually into the target or object domain, must minimize both geometric and radiometric distortions. This chapter provides an overview of two models that define the SAR operational process–physical model and system model–to facilitate our discussions in Chapters 5, 7, and 8.

 Cite
Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.