Anti-Jamming antenna is an effective way of suppressing oppressive jamming. But the number of antenna elements is limited by apertures of platform in some cases, resulting in the reduction in the number of jamming which can be suppressed. In this paper an anti-jamming algorithm based on virtual array extending is proposed. The received signals become non-circular extended signals because of the non-circular property of satellite navigation signal, and the extended data are processed by using anti-jamming algorithm for the increase in the number of jamming which can be suppressed. Theoretical analysis and computer simulation show that the proposed algorithm is effective.