Signalanalys och val av störsignal mot syntetisk apertur radar
Publish date: 2002-01-01
Report number: FOI-R--0526--SE
Written in: Swedish
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.