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Analysis of Moving Target Identification (MTI) Algorithms for Airborne SAR

Bonetti, Giovanni Kock (2009) Analysis of Moving Target Identification (MTI) Algorithms for Airborne SAR. Bachelor's, Instituto Technológico De Aeronáutica.

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Abstract

In the frame of the ARGOS project a near-real time onboard processor for Ground Moving Target Identification (GMTI) should be developed for the F-SAR system. The objective of the work is to develop a fast moving target position and motion parameter estimation procedure. Since after common SAR focusing the moving targets become displaced in azimuth and range, by measuring the offset it is possible to estimate their motion parameters as well as their true beam center positions. The offset measurement requires, however, a priori knowledge, i.e. the exact road position within the SAR image. The innovation of the presented work is mainly the pre-processing step: SAR focusing and dual-channel calibration is quickened by selecting only relevant parts of the range compressed data – namely a few patches that cover all the roads of interest in the dataset. Besides no further adaptive focusing for each target is necessary, as the algorithm relies just in the detected target position at the commonly focused SAR data. In addition, the target velocity estimation (both across- and along-track components) makes use not only of the azimuth displacement to the road, but also of the often disregarded range shift. Furthermore, as the commonly focused signal is still too smeared for an accurate displacement measurement, a refinement in the Doppler domain is employed to get a sharper detection and hence a more accurate motion parameter estimation. The algorithm description comprehends mainly the coordinate transformation - latitude/longitude to range/azimuth – and an iterative procedure for accurate displacement and velocity estimation. The implemented program output is both the target motion parameters and the "true" geographic coordinates. The whole procedure has been verified with real FSAR data.

Document Type:Thesis (Bachelor's)
Title:Analysis of Moving Target Identification (MTI) Algorithms for Airborne SAR
Authors:
AuthorsInstitution or Email of Authors
Bonetti, Giovanni Kockgiovanni.bonetti@gmail.com
Date:2009
Number of Pages:100
Status:Published
Keywords:Synthetic Aperture Radar (SAR), Ground Moving Target Indication (GMTI)
Institution:Instituto Technológico De Aeronáutica
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Transport
HGF - Program Themes:Traffic Management
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - ARGOS (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Stefan Baumgartner
Deposited On:28 Dec 2009 19:13
Last Modified:15 Jan 2010 02:30

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