Abstract: Complicated range gate radar systems are known for determining distance to a target, the target sometimes being centered in the range gate which may have a predetermined width equivalent to a predetermined distance. For example, the range gate may extend from 10,000 to 11,000 yards. The present invention provides a new and simple system for determining range to a target. A series of pulses of energy capable of being reflected from a target is transmitted. Consecutive pulses in the series are spaced apart in time by a predetermined interval and echo-pulses from the target are listened for for a time after each of a plurality of the transmitted pulses. The listening time for consecutive transmitted pulses is varied in a substantially linear manner from substantially zero to a maximum time less than the predetermined interval between transmitted pulses. The transmitted pulses are counted from the beginning of the measurement interval.