Optimal Post Correlator Diversity Reception with Beamforming for the Ship Relative Global Positioning System (SRGPS)

The Ship Relative GPS (SRGPS) system will support high intensitylaunch and recovery of fixed and rotary wing manned aircraft, aswell as UAV and UCAV types, aboard a variety of ships. Criticalto its success will be GPS phase tracking at high J/S levels, anddetection and rejection of shipboard multipath.In Phase I TISI developed a multi-antenna architecture combiningPost Correlator Diversity (PCD) and Space Time AdaptiveProcessing (STAP). TISI and sub-contractor Rockwell-Collins weresuccessful in achieving A/J and multipath objectives. Highfidelity simulation models of PCD signal tracking diversityfunctions were developed by TISI and Rockwell-Collins performedsimulations of the STAP antenna system components.During Phase II a demonstration version of the combined STAP-PCDconfiguration will be assembled and tested. Hardware/firmwareelements will be built around TISI's GPS receiver developmentplatform and Rockwell-Collins' STAP/ SAASM receivers. Testingwill be carried out at the Antenna Wavefront Simulator (AWFS)facility in Dayton OH.Ten Phase II tasks are defined in the primary development periodfollowed by a five-task option for field experiments, includingground and air unit integration with the SRGPS test bed, andsupport of shore-side and shipboard tests. The STAP-PCD system may be deployed aboard 200 or more NAVY ships. The system could be installed at a large number of shore-side military landing facilities. STAP-PCD also represents a solution to spoofing and jamming of civilian airport facilities.Lastly, in vehicle positioning and attitude-determination, PCD overcomes vehicle blockage and flexure problems.