P/Y Code pseudolite data link to a military GPS receivers

Period of Performance: 06/19/1998 - 06/19/2000


Phase 2 SBIR

Recipient Firm

Navsys Corp.
14960 Woodcarver Road Array
Colorado Springs, CO 80921
Principal Investigator

Research Topics


The proliferation of GPS into weapon systems provides an opportunity to establish a common data interface into GPS guided weapons. This can be used to support precision targeting and end-game guidance of weapon systems. This project will provide a network-based architecture that uses a geostationary satellite transponder to provide a GPS overlay to enable data communications directly into GPS receivers. The WAM system design presented is modeled on the FAA's WAAS program which uses a geostationary overlay as an integrity messaging system to GPS receivers. The message structure selected enables ascii or binary data to be addressed to specific GPS receivers, and provides shared access for multiple users to the satellite communications link based on priority scheduling using standard Internet access protocols. NAVSYS will implement and test a GPS-WAM system architecture and demonstrate the operational effectiveness of this system for the warfighter under the Phase II program. The following Phase II technical objectives have been established to achieve this goal. Develop project documentation. Procure the project hardware and software. Develop, integrate, and test a GPS-WAM demonstration capability. Install, configure, and maintain the GPS-WAM Ground Uplink Station equipment at the POR satellite earth station. Integrate the system for network interconnectivity. Perform the Virtual Laser and the Battlefield Paging Demonstrations.