Abstract: An access control system is provided wherein identification data such as a photograph is downloaded from a trusted authority to a security system. Security personnel can then compare the person seeking access to an image of the person as sent by the trusted authority, and avoid reliance on identification documents presented by the person seeking access.

Abstract: A system for locating players on a field includes first and second directional scanning antennas located adjacent the field. A transponder carried by the players detects the radiation from each antenna and transmits timing signals. The timing signals are received at a central station and compared to reference timing signals synchronized with the scanning of the antennas to provide an indication of the angular position of each player from the scanning antenna locations. The actual field position of the players can then be computed. The system can also locate the position of a playing object, such as a ball.

Abstract: A system is provided with a directional antenna having first and second antenna patterns oriented around an antenna boresight direction. The antenna boresight is oriented in a direction corresponding to a play determinative line on a playing field. Signals are emitted firm a playing object, used as a ball and detect using the two antenna patterns. Comparison of the detected signals provides an output indication when the playing object crosses the play determinative line.

Abstract: Disclosed is a system for receiving a signal from a known direction and rejecting interfering signals arriving from other directions. The system makes use of an antenna unit having multiple output ports, each responsive to signals from a different selected region of space. The output port correspondong to the region of space, which includes the direction of the desired signal, is coupled directly to an output combiner while the antenna ports corresponding to the remaining regions of space are combined to form a reference signal. Means are provided to form a correction signal in response to the reference signal and output signal for suppressing interfering signals arriving from other than the selected region of space.