Rice, William A.; National Range Operations Directorate (International Foundation for Telemetering, 1982-09)
      The Drone Formation Control System (DFCS) was developed by IBM, Federal Systems Division in 1976 under contract to the US Army White Sands Missile Range (WSMR) to provide precise automatic closed-loop control for multiple target aircraft. The unique DFCS distance measuring equipment (DME) data link allows for both range measurement and the transmission of both command and telemetry data on a single frequency (915 MHz). The DFCS is controlled by a federated chain of microprocessors linked to a large scale IBM System 360 Model 75. The unique data link embedded in a system totally driven by software allowed the DFCS to be modified for automatic control of multiple ground targets as well as aerial targets. This paper briefly describes the DFCS and the modifications performed for ground target control. The DFCS RF modulation/demodulation technique is emphasized.

      PARRA, MARIO Z.; National Range Operations Directorate (International Foundation for Telemetering, 1982-09)
      The Phase Difference Measuring (PDM) system is an RF interferometer object tracking system which utilizes the object’s radiated telemetry power spectra for tracking purposes. The PDM system is being developed in-house at White Sands Missile Range as a highly mobile electronic angle measuring system, to augument existing position measuring capability in range instrumentation systems. The system is comprised of two Remote Data Acquisition Stations (RDAS) and a Cosine Conversion Facility (CCF). Each RDAS is comprised of two antenna arrays configured as crossed baselines. The RDAS equipment utilizes high speed RF switching in a time sharing technique designed to reduce the amount of hardware required at the remote sites to produce direction cosines. The CCF collects two direction cosines from each RDAS, it then transforms the direction cosines to position data for subsequent transmission to a Range Control Center. This paper will provide basic system theory, explain the proposed antenna PF switching techniques, and also the computer simulation analysis for a baseline consisting of two pair of antennas.