Back to results
US 4,638,493 AGranted
Adaptive interference rejection for improved frequency hop detection
AssigneeSperry Corporation
InventorsF. Avery Bishop, Ronald S. Leahy
Life of this patent
Estimating the term…
Abstract
Adaptive filters are used to separate frequency hop signals to improve the detection and estimation of the frequency hop signals. In preferred embodiments, two or more adaptive filters (which can be connected in series or in parallel) exhibit different convergence characteristics to isolate a frequency hop signal.
Claims13
A time-bandwidth discrimination system for providing enhanced frequency hop detection comprising,
- a first adaptive line enhancer (ALE) with a relatively slow convergence factor, and
- a second adaptive line enhancer (ALE) with a relatively fast convergence factor connected to said first adaptive line enhancer thereby to separate, isolate and distinguish frequency hop signals from interference signals,
- each of said first and second ALEs having an input terminal, a signal output terminal, and an error output terminal wherein, the respective convergence factor is defined by an iterative algorithm by which the signal at the error output terminal is "converged" toward a minimum value.
The system recited in clam 2 wherein,
- said second ALE produces wideband noise at the error output terminal and produces a frequency hop signal at the signal output terminal.
Dependencies are inferred from the claim text.