Global navigation satellite systems (GNSS) can be used to provide continuous, safe, and reliable positioning, speed measurement, and timing services. Generating or replicating GNSS signals, a spoofer can trick the receiver into believing it is located elsewhere and, unlike in the case of jamming, the user
can not easily detect such an attack. A pre-correlation spoofing mitigation approach that considers an antenna array is presented. A loosely integrated receiver is considered with an anti-spoofing subsystem processing the signals received by an antenna array and afterwards passing a spoofing-free signal to a connected state-of-the-art single-antenna GNSS receiver. This approach is independent of the specific GNSS signals or constellations and applies to both open and authorized (military) services.