Hardware Realization and Performance Measurement of an Anti-Jam GPS Antenna Array

A four-port anti-jam GPS antenna array is used to electronically steer pattern nulls in the direction of incoming RF interference. Null-steering weights are applied using physical hardware and reception pattern measurements are made in an anechoic chamber for multiple jammer angles-of-arrival. Jammer suppression and null misalignment for two null steering reference element cases are compared.