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Simulation-based comparison of some gmti techniques

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2009
Baktır, Can
With the developing radar technology, radars have been started to be used in the airborne platforms due to the need of fast, accurate and reliable information about the enemies. The most important and tactically needed information is the movements in an observation area. The detection of a ground moving target buried in a dense clutter environment from a moving air platform is a very challenging problem even today. The geometry of the operation, the course of the flight and structure of the clutter are the most effective parameters of this problem. There are some “Ground Moving Target Indication” (GMTI) techniques that have been studied for the last twenty years to overcome this problem. In this thesis, the simulation of some of these techniques in a realistic environment and the comparison of their performances are discussed. In this work, a GMTI simulator is developed to generate the environment containing the clutter and the noise signals, to locate and simulate the targets in this environment and to apply the GMTI techniques on the raw data generated by the simulator. The generation of the clutter signals including the internal clutter motion (ICM) for different types of clutter distributions is one of the most important parts of this thesis. The GMTI techniques being investigated throughout this thesis are “Displaced Phase Center Antenna” (DPCA), “Along-Track Interferometry” (ATI), “Adaptive DPCA”, “Pre-Doppler Sigma-Delta STAP” and “Post-Doppler Sigma-Delta STAP” techniques. These techniques are compared according to their clutter suppression and target detection performances under different environmental conditions.