Signal Relay Systems Using Large Space Arrays

The results of an investigation of the feasibility of using passive space arrays as highly efficient signal reflectors is reported. The design selected as having the maximum efficiency in terms of the ratio of the signal energy reflected in the required direction to the weight of the space array is a gravity gradient stabilized planar array of dipoles connected and supported by lightweight dielectric filaments. The system and space array parameters required to give a high capacity system output are examined together with the flexibility of the system parameters and operations. This analysis is to determine if a high-capacity space array system can be designed with a potential capability to operate with small stations in both the transmit and receive modes; to achieve significant improvements in spectrum utilization over that achieved in conventional active satellites; and to provide accurate position information. The status of the investigation and the need for additional experimental programs are also discussed. The Appendixes are on signal processing for the space arrays, dipole arrays as reflectors for active satellites or ground antenna systems, and space grating arrays to relay optical signals.