Lockheed Martin Space Systems Co., was yesterday awarded a $1,310,303,131 contract modification which will provide for the production of the fourth Advanced Extremely High Frequency Satellite Vehicle(SV4). In addition to delivery of the space vehicle, this effort includes SV4 unique systems engineering; system level factory test; system database management functions; systems level support equipment; and program management. The advanced EHF constellation will consist of four cross linked satellites which will provide more data throughput capability and coverage flexibility to regional and global military operations than ever before. The satellites will provide 10 times greater total capacity and offer channel data rates six times higher than that of Milstar II communications satellites. The higher data rates permit transmission of tactical military communications such as real-time video, battlefield maps and targeting data.