Back to results
US 4,229,738 AGranted
Early-late gate
AssigneeThe United States of America as represented by the Secretary of the Army
InventorRobert T. Campbell
Life of this patent
Estimating the term…
Abstract
An early-late gate for a high resolution range tracking system of a radar ing a high frequency double-balanced mixer in conjunction with a bi-polar pulse gate allows simplified early-late gating for a range error measuring system.
Claims4
In a range tracking system of a radar a method for providing early-late gating of radio frequency input pulses with a double-balanced mixer and comprising the steps of:
- applying bi-polar pulses to the center tap of a first transformer of said double-balanced mixer,
- selectively gating a diode bridge of said double-balanced mixer on and off in response to said bi-polar pulses, and
- directing radio frequency input pulses to a second transformer of said mixer for coupling through said bridge and first transformer to provide an output signal in accordance with the on-off state of said diode bridge.
Apparatus providing an early-late gate for producing time alignment error signals and comprising:
- a double-balanced mixer having a first input adapted for receiving radio frequency input pulses, a second input adapted for receiving bi-polar video pulses, and an output for coupling output signals therefrom, said output signals being time alignment error signals;
- and a bi-polar pulse source coupled to said second mixer input for providing split-pulse gating of radio frequency signals coupled thereto.
Dependencies are inferred from the claim text.