System and method for nulling or suppressing interfering signals in dynamic conditions

Patent metadata

Field	Value
Publication number	US-11601214-B2
Application number	US-201916253283-A
Country	US
Kind code	B2
Filing date	Jan 22, 2019
Priority date	Jan 22, 2019
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A system and method for nulling or suppressing interfering signals directed toward moving platforms based, at least in part, on dynamic motion data of the moveable platform is provided. The system may be an interference nulling system carried by a moveable platform and may include an antenna array including two or more antenna elements that generates at least one initial steerable null radiation pattern, dynamic motion data logic that determines dynamic motion data of the moveable platform; and update logic that updates the at least one initial steerable null radiation pattern based, at least in part, on the dynamic motion data. The at least one updated steerable null radiation pattern is directed toward a direction from which interfering signals are being transmitted from an interfering signal source.

First claim

The invention claimed is:

1. An interference nulling system for a moveable platform, comprising:
an antenna array including two or more antenna elements that generates at least one initial steerable null radiation pattern; wherein the at least one initial steerable null radiation pattern is directed toward a direction from which interfering signals are being transmitted from at least one interfering signal source;
at least one sensor that senses dynamic motion data of the moveable platform; wherein the dynamic motion data includes at least one or more rotational movements of the moveable platform;
dynamic motion data logic that processes the dynamic motion data of the moveable platform;
update logic that updates the at least one initial steerable null radiation pattern to generate an at least one updated steerable null radiation pattern based, at least in part, on the dynamic motion data; wherein the at least one updated steerable null radiation pattern is directed toward the direction from which the interfering signals are being transmitted from the at least one interfering signal source;
weight logic that determines a first set of weight coefficients of the two or more antenna elements; wherein the at least one initial steerable null radiation pattern is based, at least in part, on the first set of weight coefficients;
first position logic that determines a current position of the moveable platform based, at least in part, on the dynamic motion data;
second position logic that determines a predicted position of the moveable platform based, at least in part, on the dynamic motion data; and
adaptive weight logic that determines a second set of weight coefficients of the two or more antenna elements based, at least in part, on a change between the current position of the moveable platform and the predicted position of the moveable platform; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the second set of weight coefficients.

2. The interference nulling system of claim 1 , further comprising:
an initial set of weight coefficients of the two or more antenna elements; wherein the at least one initial steerable null radiation pattern is based, at least in part, on the initial set of weight coefficients of the two or more antenna elements; and
an updated set of weight coefficients of the two or more antenna elements; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the updated set of weight coefficients of the two or more antenna elements.

3. The interference nulling system of claim 1 , wherein no interfering signals are received by the interference nulling system after the at least one initial steerable null radiation pattern is directed toward the direction from which interfering signals are being transmitted from the at least one interfering signal source.

4. The interference nulling system of claim 1 , further comprising:
first orientation logic that determines a current orientation of the moveable platform based, at least in part, on the dynamic motion data;
second orientation logic that determines a predicted orientation of the moveable platform based, at least in part, on the dynamic motion data; and
adaptive weight logic that determines the second set of weight coefficients of the two or more antenna elements based, at least in part, on a change between the current orientation of the moveable platform and the predicted orientation of the moveable platform; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the second set of weight coefficients.

5. The interference nulling system of claim 1 , further comprising:
position and velocity logic that determines a position and velocity of the interfering signal source;
tracking logic that tracks movement of the at least one interfering signal source; and
adaptive weight logic that determines the second set of weight coefficients of the two or more antenna elements based, at least in part, on the movement of the at least one interfering signal source; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the second set of weight coefficients.

6. The interference nulling system of claim 1 , wherein the moveable platform is a precision guidance kit for a guided projectile; wherein the interference nulling system is carried by the precision guidance kit; and wherein the precision guidance kit comprises a canard assembly including at least one canard that is moveable.

7. The interference nulling system of claim 6 , wherein the dynamic motion data represents one or more rotational motions of the interference nulling system.

8. The interference nulling system of claim 7 , wherein the dynamic motion data represents one or more translational motions of the interference nulling system.

9. A method comprising:
generating at least one initial steerable null radiation pattern of an array antenna including two or more antenna elements carried by a moveable platform;
obtaining dynamic motion data of the moveable platform having moved from a first position to a second position; wherein the dynamic motion data includes at least one or more rotational movements of the moveable platform;
updating the at least one initial steerable null radiation pattern based, at least in part, on the dynamic motion data of the moveable platform; and
directing the at least one updated steerable null radiation pattern toward a direction from which interfering signals are being transmitted from an interfering signal source;
determining a first set of weight coefficients of the two or more antenna elements; wherein the at least one initial steerable null radiation pattern is based, at least in part, on the first set of weight coefficients;
determining a current position of the moveable platform based, at least in part, on the dynamic motion data;
determining a predicted position of the moveable platform based, at least in part, on the dynamic motion data; and
determining a second set of weight coefficients of the two or more antenna elements based, at least in part, on the current position of the moveable platform and the predicted position of the moveable platform; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the second set of weight coefficients.

10. The method of claim 9 , wherein the at least one initial steerable null radiation pattern is based, at least in part, on an initial set of weight coefficients of the two or more antenna elements; and wherein the at least one updated steerable null radiation pattern is based, at least in part, on an updated set of weight coefficients of the two or more antenna elements.

11. The method of claim 9 , wherein the dynamic motion data represents one of: (i) one or more rotational motions of the moveable platform; and (ii) one or more translational motions of the moveable platform.

12. The method of claim 9 , further comprising:
determining a current orientation of the moveable platform based, at least in part, on the dynamic motion data;
determining a predicted orientation of the moveable platform based, at least in part, on the dynamic motion data; and
determining the second set of weight coefficients of the two or more antenna elements based, at least in part, on the current position of the moveable platform and the predicted position of the moveable platform; wherein the at least one updated steerable null radiation pattern is based, at least in part, on the second set of weight coefficients.

13. The method of claim 9 , further comprising:
dete

Assignees

• Bae Sys Inf & Elect Sys Integ
• Bae Systems Information And Electronic System Integration Inc

Inventors

• Zemany Paul D
• Chrobak Matthew F
• Degtiarev Egor V

Classifications

• F41G7/346

  using global navigation satellite systems, e.g. GPS, GALILEO, GLONASS · CPC title

• H04K3/224 Primary

  with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer · CPC title

• H01Q9/0407

  Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40) · CPC title

• G01S19/21

  Interference related issues {; Issues related to cross-correlation, spoofing or other methods of denial of service} · CPC title

• G01S19/49

  whereby the further system is an inertial position system, e.g. loosely-coupled · CPC title