Algorithm 1: GNSS Anti-Spoofing Scheme

DOA Estimation

Input:  $x\left(n\right)$

1: Construct the covariance matrix by Equation (5) to suppress the noise component.

2: Reduce the correlation between sources according to Equation (13).

3: Estimate the DOAs for sources through Equation (18).

Output: Estimated DOAs

Spoofing Detection and Mitigation

Input: Estimated DOAs

1: The enhanced power estimation is performed by Equation (19).

2: Separate the incident signals according to Equation (24).

3: Obtain the cross-correlation results by Equation (25).

4: Make decisions based on power comparison and cross-correlation results.

5: Calculate the output signal according to the decision results.