Electromagnetic environment is becoming worse and worse, and the signal is quite weak. Navigation receiver is sensitive to interference, so it is important to improve the output performance of navigation receiver. The traditional methods in array signal processing include SMI (Sample Matrix Inverse), LMS (Least Mean Square), and PI (Power Inverse) and so on. These methods have upstanding anti-jamming but useless to enhance the navigation signal. Based on the subspace projection method and combined the navigation signal self-correlation property, the optimization correlation peak vector is constructed, with which to form the beam and enhance the navigation signal. The processing of the real data identified that the method is effective to enhance the navigation signal.