Rca Inc.

The United States of America As Represented by the Administrator of the

Walter Lee Ross

James C Fletcher

A digitally controlled resistance generator (10) in which resistors (16-38) having values selected according to an expression 2.sup.N-1 (R), where N is equal to the number of terms in the expression, and R is equal to the lowest value of resistance, are electrically inserted into a resistive circuit in accordance with a parallel binary signal provided by an analog-to-digital converter (46) or a programmable computer (75). This binary signal is coupled via optical isolators (50-72) which, when activated by a logical '1,' provides a negative potential to some or all of the gate inputs (96) of the normally 'on' field effect transistors (98-120) which, when 'on,' shorts out the associated resistor. This applied negative potential turns the field effect transistors 'off' and electrically inserts the resistor coupled between the source terminal (124) and the drain terminal (122) of that field effect transistor into the resistive circuit between the terminals (12, 14).

Digitally controlled system for effecting and presenting a selected

A digital tracker in a cooperative collision avoidance system capable of generating track gates and determining critical values of tau (time to collision) for at least 16 targets and to determine the presence of two targets of substantially similar ranges and to track two such co-range targets.

Multi-target tracker for tracking near co-range targets

In an interrogation vehicle, a receiver of data from a plurality of remote vehicles such as aircraft or maritime vessels in a cooperative collision avoidance system is arranged to receive such data reply signals in reply to interrogation signals. The reply signals are suitably coded in the remote vehicles to provide information in a predetermined plurality of sequential replies from each replying vehicle.

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Simi Valley, CA, United States of America

Walter Lee Ross