Single Pulse TOA Measurement System.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to a direction finding system which will provide, upon receipt of one single electromagnetic pulse, the direction of the emitter which produced that pulse with respect to a fixed reference. This is done by measuring the time between the arrival of the pulse at two antennae. The basic time measurement may be made for example by charging a capacitor at a fast linear rate during the interim period between the arrival of the pulse front edges. The first pulse starts the charging of this capacitor and the second pulse stops it. The result is a fast rising ramp whose height is proportional to the time delay. To allow differentiation between signal arrival from the right and left side of the center line of the fixed reference, and assuming a base leg between antennas of 24 feet, a fixed delay at 25 nsec is added to channel B such that the B pulse always arrives after the pulse in channel A.
- Direction Finding