Adaptive antenna array technology is the most effective method for anti-interference of Global Navigation Satellite Systems(GNSS). However, this anti-interference processing generates carrier phase measurement bias related to the direction of signal incidence, which limits the effective application in high-precision measurement. In order to reduce the bias of anti-interference processing, an analysis method of introducing measurement bias is proposed, a corresponding model is established, and a software receiver is built for simulation experiments. The results show that without adding additional constraints, adopting the space frequency minimum variance distortionless response algorithm to achieve a space frequency anti-interference processor would not introduce carrier phase measurement bias, making it very suitable for applications in fields with strict requirements on anti-interference performance and measurement accuracy.