Null-Steering LMS Dual-Polarised Adaptive Antenna Arrays for GPS

Abstract

The implementation of a null steering antenna array using dual polarised patch antennas is considered. The best optimality criterion for a dual polarised GPS antenna array is briefly discussed, followed by a description of the associated LMS algorithm. To prevent weight vector drift a version of the circular leakage LMS algorithm was used. The implementation details of a simplified circular leakage algorithm that is more suited to an FPGA implementation are presented.