DURING THE PHASE I PROGRAM, MARK RESOURCES VERY SUCCESSFULLY DEMONSTRATED THE FEASIBILITY OF USING SEVERAL DISTRIBUTED SMALL AND SIMPLE FRPAS THAT DO NOT NEED TO BE PRECISELY ARRANGED, TO SUPPRESS WIDEBAND INTERFERENCE AND/OR JAMMING AND TO PROVIDE SUFFICIENTLY ACCURATE AND TIMELY POSITION AND VELOCITY MEASUREMENTS FROM THE C/A CODE FOR LAUNCH VEHICLE RANGE SAFETY, ANTENNA POINTING, AND ATTITUDE DETERMINATION. THE NEW TECHNOLOGY, DEMONSTRATED VIA SOFTWARE SIMULATION, IS COMPATIBLE WITH EXISTING LAUNCH-CAPABLE GPS ANTENNAS AND RECEIVER HARDWARE, AND REQUIRES THE ADDITION OF CABLING AND A COMMON PROCESSOR (AND CAN ACCOMMODATE CHANNEL MISMATCH IN THE RECEIVERS OR ADDED HARDWARE). THE PROCESSING LOAD FOR JAMMER SUPPRESSION IS SMALL, LESS THAN THAT FOR GPS SIGNAL TRACKING. THE PHASE I PROGRAM EMPLOYED SIGNAL SIMULATION AT THE INTERMEDIATE FREQUENCY (IF) OF THE RECEIVERS, AFTER DIGITIZATION. DURING PHASE II, WE PROPOSE TO DEVELOP A DEMONSTRATION UNIT CONSISTING OF LAUNCH-COMPATIBLE ANTENNA AND RECEIVER HARDWARE PLUS PROCESSING SOFTWARE; AND TO MEASURE ITS PERFORMANCE USING A HIGH-FIDELITY RF SIMULATION.