Multiport df antennas and df systems
AssigneeApplied Signals Intelligence, Inc.
InventorsJohn W. McCorkle, Timothy R. Miller
Life of this patent
Estimating the term…
Abstract
A multi-port antenna and associated systems having extremely wide bandwidth and capable of maintaining directivity as frequency decreases and is made arbitrarily low, allowing DF systems to operate to arbitrarily low frequency regardless of size. Construction may be rugged, lightweight, and low cost, allowing reliable service in harsh environments. The systems allow utilization of both the E and H fields occupying a common area of space. The disclosed DF system takes advantage of knowledge of the as-installed array manifold, uses pattern matching to determine the angle of arrival (AoA) of incoming waves, and enhances sensitivity by using integration on cross-correlation products between the multiple ports to achieve SNR improvement.
Claims9
A DF system comprising:
- an antenna system that senses EM waves;
- a receiving system;
- and
- an estimator system,
- wherein the antenna system receives emissions from at least one RF emitter and outputs signals from a set of ports, wherein the receiving system accepts the signals from the set of ports in the antenna system, and outputs a group of signals of interest, each signal of interest having a set of outputs corresponding to the antenna system's set of ports, to the estimator system, wherein the estimator system accepts the set of signals output by the receiving system and generates an estimated AoA of the emissions.
Dependencies are inferred from the claim text.