Innovative forward looking SAR systems for UAV guidance navigation and landing
Menichino, Flavio (2010) Innovative forward looking SAR systems for UAV guidance navigation and landing. [Tesi di dottorato] (Inedito)
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The future evolution of the Airspace System includes various manned and unmanned vehicles flying contemporaneously in an unstructured environment, to support civil, commercial and military applications. During various phases of the flight, it is of paramount importance to offer an advanced “see-understand” system either to the pilot or finalized to autonomous flight and operation. Sensing and Avoid, Emergency control and landing and assistance to navigation are fundamentally based on acquiring and analyzing high geometric and radiometric resolution all-weather day and night images along the flight path of the vehicle. The conducted studies here presented had the main purpose to reply at this increasing need of the airspace system researching for the most suitable system able to provide an aircraft with a forward looking real time vision. In the study several solutions are proposed, analyzed and simulated by a sophisticated simulation system. All systems are based on SAR technology to provide the aircraft with a system totally independent on the daylight or weather conditions. The main challenge of the work indeed lies in using a SAR system in a forward looking configuration. In fact, it is well known that in such a configuration a SAR shows the typical limitations of its technology like a dramatic decrease of the Doppler bandwidth, the characteristic left-right ambiguity and also increases the needed image-time thus decreasing the refresh rate. The new FL SAR systems here proposed aim to solve these problems using new solutions and well tested technologies recombined together in order to overcome or bypass the classical FL SAR problems. The intermediate systems also presented along the dissertation, point out the main problems we faced with and provide the logic evolution of the ideas path that leaded to the ultimate FL SAR system able to offer a continuous and hi-resolution FL SAR vision.
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