With the development of navigation and reflection signal technology in the field of Marine remote sensing, the application of satellite-borne Delay-Doppler Map (DDM) to target detection on the sea surface has become a hot research issue. However, due to the non-uniqueness of the same time delay and the corresponding space region of Doppler points in DDM, the problem of location ambiguous of true and false targets arises. In this paper, the combined processing of DDM corresponding to different Specular points (SP) under multiple satellites was used to remove false targets. Firstly, the distance between the target and their respective SP was calculated, and then all the targets were unified in one coordinate system with one SP as the origin, and the false targets were removed by the aggregation of true targets. Finally, the final geographical position of the target was obtained through the relationship between longitude, latitude and distance. In this paper, the DDM data of Cyclone GNSS constellation was used to carry out verification experiments. The results show that the true target will gather and the false target will disperse when the multi-star trajectory DDM is used to detect the sea surface target. The calculated final position of the target is consistent with the variation law of the working place of "Nan Hai No.4" drilling platform in the same period of time, and the error is less than 1.5km, which indicates that the proposed method can effectively solve the problem of location ambiguous on the sea surface target.