Abstract:
Many anti-jam techniques for GPS rely on the direction-of-arrival (DOA) of the satellite signals. When the DOA of the satellite signals is difficultly estimated, these above algorithms will fail to work. By utilizing subspace projection, this paper proposes a new anti-jamming algorithm for conventional multi-beam forming. In this present approach, the jammer components are first removed from the received data by subspace projection technique, and then in the fixed directions, several main lobes are formed via the conventional beamforming (CBF) method. Finally, the jammer-free data obtained from each beam are utilized to capture satellites and obtain a position. The main feature of the present approach is to not require the DOA of the satellites. Moreover, there is a certain gain in the signal direction. Hence, the proposed algorithm is suitable for the scenarios with fewer antenna elements and difficulty in the estimate of the DOA of the signals.