Mainlobe interference suppression via transmit phase codes optimisation in MIMO radar systems

摘要

Recent studies allow mainlobe interference suppression in MIMO radar systems by weighting the random phase codes at transmitter. However, the performance of interference suppression is not stable when the phase codes are generated randomly, especially in the case of the small number of the elements or a large number of interferences. A transmit phase codes optimisation method is proposed. The modified transmit steering vector is constructed by combining the transmit phase codes and the steering vector of the expected signal. The problem can be solved by minimising the projection of the modified transmit steering vector onto the interference subspace. Simulations verify the effectiveness of this method.