THE SPACE SURVEILLANCE SYSTEM

The Naval Research Laboratory proposed the Space Surveillance System for detecting, tracking, and orbit predicting of non radiating satellites. The Advanced Research Projects Agency has supported a feasibility experiment as Phase I, which has been completed. Further research and development in the area covered by this System are proceeding. Currently this System provides the only operational capability the Country has to detect noncooperating unannounced satellites. The performance of the experimental system on typical satellites is illustrated. Coverage extends to about 450 statute miles in height on one-square-meter targets over limited sections of an east-west line. The second phase of the program, now in the development stage will provide coverage to a height of about 2500 miles with a probability of detection of 95 percent over the extent of the entire line from the east to the west coast. Also automatic processing of data is to be incorporated to provide a system suit- able for operational use. A fully operational system requires a second line to enable precise orbit determination in a single pass. A recommended location is on a line extending in a northwest-southeast direction across the United States. The flexibility of the system design permits extensions and additions of equipment and facilities to meet increased operational requirements.