Global Navigation Satellite System (GNSS), is a critical infrastructure that traffic users highly rely on. For the security risks caused by the low-cost jammer, this paper proposes an improved algorithm of the optimal weight coefficient base on the multi-antenna arrays. Via the simulation and field testing, it shows that our proposed has excellent anti-interference performance, and the probability of missed detection and false detection of the prototype is 40.073% and 8.0146% respectively. This work has great significance to the research and development of single-frequency anti-jamming, high-precision, real-time vehicle-based GNSS receivers in the future.