Intentional deception jamming brings great threat to satellite navigation receiver and seriously influence GNSS application security. For repeater deception jamming, an anti-spoofing algorithm based on a single receiver is proposed. Using the adjacent two times measurement pseudo-range does double differences, and Taylor expansion is applied to the position relationship in equations. Under the condition of the previous time’s position information is known, the authenticity of the satellite signal of the next time can be verified according to the position information when it is combined with the least square iterative solution for the double differences equations. The algorithm is simple, and only a single receiver and pseudo-range measurement data is needed. NovAtel receiver is adopted for the actual experiments, and the result validates the feasibility and effectiveness of the algorithm.