Raytheon Aircraft Montek Company,through Montek IR&D and funded development,completed in November of 1996 a GPS-enhanced ATC/ALS (Air Traffic Control/Advanced Landing System) program which developed a unique,record-setting direct-sequence,reconfigurable matched filter DSP technology via reconfigurable logic for the LPI datalink segment of the ATC/ALS program.The two-way LPI datalink forms the heart of the TDMA communication structure that controls 100 aircraft.The datalink performs aircraft acquisition/synchronization,range determination,data correction,and relays GPS data between control platform and all aircraft for relative All-in-View KCPT (Kinetic Carrier Phase Tracking) Landing solution and position determination.The low-power LPI datalink operates in the S-band and achieves LPI through frequency-hopping (FH) and BPSK direct-sequence (DS) spread-spectrum techniques.The ATC/ALS system was successfully flight tested aboard a Raytheon Beechcraft 1900D,which confirmed the ability of the datalink which confirmed the ability of the datalink to communicate beyond 175nm.
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