Signalanalys och val av störsignal mot syntetisk apertur radar

Synthetic Aperture Radar (SAR) provides high resolution ground images independently of weather or time of day conditions. In military scenarios, jamming transmitters are used to neutralize SAR as a source of strategic information. This study concerns a method for maximizing the interference energy in a SAR receiver using minimal transmitting power. A fast and accurate signal analysis has been developed allowing correct radar pulse trigging and the use of a narrow band jamming signal. Simulations have been performed to evaluate the use of different frequency estimation algorithms for the analysis. Further simulations and investigations, based on the functionality of a SAR, have been performed in order to find an effective form of jamming. Results show that jamming of a SAR becomes more effective if it is made frequency hopping and given frequencies close to the center frequency of the instantaneous band. A signal analysis using a phase estimation algorithm followed by a Goertzel algorithm provides the use of a gradually more narrow band jamming signal, maximizing the interference energy in the receiver of a SAR. Finally, it is established that repetitive jamming is the best option during the preliminary stage of the signal analysis when no a priori information is available.