Abstract: Spoofing is hidden because its power level below noise floor and has the same format with authentic satellite signals in time-frequency domain, which brings a great threat to the security of satellite navigation systems. The multi-antenna technology has been proved to be a very effective method in spoofing suppression. However, the interference suppression performance of multi-antenna technology in practical application is limited by the channel errors and the array aperture. In this paper, a single moving sensor is used to construct a synthetic array, and, based on this synthetic array, a spoofing suppression method is proposed. The synthetic array receiving signal model is firstly constructed in the presence of spoofing. Then the MUSIC algorithm and RELAX algorithm are respectively used to estimate the DOA (Direction of arrival) of spoofing sources. Finally, the adaptive weight vector of synthetic array is formed according to the estimated spoofing DOAs, which is used to suppress the spoofing. Simulation results prove the correctness and the effectiveness of the proposed method.