Method for eletromagnetic source localization
First Claim
1. In a system including an antenna structure and a data processing system, a method for determining a direction of arrival (DOA) of an electromagnetic plane wave from a radiating source, said electromagnetic wave exhibiting a maximum wavelength much smaller than radiating source to antenna structure distance, said method comprising the steps of:
- (a) measuring and storing sets of electric and magnetic vector components from a received electromagnetic plane wave as sensed by said antenna structure, each set defining a plane in space;
(b) deriving direction vectors orthogonal to planes defined by said measured sets of electric and magnetic vector components;
(c) finding three dimensional components of each said direction vector;
(d) averaging like dimension components for a plurality of direction vectors; and
(e) determining said DOA by vectorially combining said averaged components.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for determining a direction of arrival of an electromagnetic wave comprises the steps of: measuring sets of electric and magnetic components of an electromagnetic wave as sensed from a lumped antenna structure; finding a cross product for each measured set of electric and magnetic components so as to derive an orthogonal vector value therefrom; deriving the Castesian components for each direction vector value so determined; averaging like component vectors for each measured electric and magnetic vector component set over a plurality of measurements; and deriving a direction vector from the averaged vector values.
-
Citations
14 Claims
-
1. In a system including an antenna structure and a data processing system, a method for determining a direction of arrival (DOA) of an electromagnetic plane wave from a radiating source, said electromagnetic wave exhibiting a maximum wavelength much smaller than radiating source to antenna structure distance, said method comprising the steps of:
-
(a) measuring and storing sets of electric and magnetic vector components from a received electromagnetic plane wave as sensed by said antenna structure, each set defining a plane in space; (b) deriving direction vectors orthogonal to planes defined by said measured sets of electric and magnetic vector components; (c) finding three dimensional components of each said direction vector; (d) averaging like dimension components for a plurality of direction vectors; and (e) determining said DOA by vectorially combining said averaged components. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for determining a direction of arrival (DOA) at a sensor of an electromagnetic plane wave from a radiating source in a noisy environment, said electromagnetic wave exhibiting a maximum wavelength much smaller than radiating source to sensor distance, said sensor comprising:
-
lumped antenna means for sensing both electric and magnetic analogue field values from a received electromagnetic plane wave in at least three orthogonal spatial dimensions; analogue to digital (A/D) conversion means for periodically sampling said sensed electric and magnetic analogue field values and converting said sensed analogue field values to digital values, magnetic and electric field values sampled at approximately the same time termed a set; and processor means for deriving from each set, a direction vector orthogonal to a plane defined by said set, said processor further resolving each said derived direction vector into cartesian coordinate component values, averaging a plurality of each of said cartesian coordinate component values, and recombining said averaged cartesian coordinate component values to find a DOA vector. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification