Global Positioning System (GPS) Jamming Situational Awareness for Naval Surface Fire Support (NSFS)

"Toyon Research Corporation proposes to research and to develop a low-cost, jammer localization and characterization network, as well as the analysis tools necessary to ensure that the system provides valuable assistance in battlefield awareness andmission planning. The system will consist of a single control station and two or more remote stations that can be ground-based or UAV based. The primary focus of this effort will be to locate sources of GPS interference, such as jammers. In order toachieve the highest localization accuracy possible, while keeping costs low, the proposed system will be a hybrid implementation of a bearings-only measurement system and a time-difference-of-arrival (TDOA) system. Each remote station will synchronouslysample and store the monopulse direction-finding (DF) RF information and compute a bearing measurement. These bearing measurements, along with power measurements, will then be transmitted to the control station and be used to determine whether or not anyof the measurements are potentially from the same emitter. In addition, the control station will periodically request that the remote stations transmit the stored samples, which correspond to the previously submitted bearing measurements, for furtherprocessing. At this point, both TDOA and differential-Doppler (DD) techniques can be utilized to further improve the initial bearings-only emitter location estimates. The loss of GPS signal lock due to