Design Considerations for a Wearable Anti-Jam GPS Antenna

System constraints for a wearable anti-jam GPS antenna are explored, including antenna size, design of textile integrated wearable antennas, null steering algorithms to maximize anti-jam performance, system power consumption, and data rate limitations into a GPS receiver. A textile-integrated pin-fed GPS patch antenna is analyzed through simulation and measurement and found to perform reasonably well, though with a size that may be restrictive for employing an anti-jam antenna on the human body. A dual polarized null steering algorithm is explored through analytical simulation to assess its ability to increase the anti-jam performance of a controlled reception pattern array without increasing the overall size of the array. Finally, overarching limitations for man-portable anti-jam GPS systems such as RF front end power consumption and data rate limits of the interface between an anti-jam module and a standalone GPS receiver are discussed and related to both antenna design and null-steering algorithm selection.