James Marion Bowden

US Patent:

20190178973, Jun 13, 2019

Filed:

Feb 5, 2019

Appl. No.:

16/267564

Inventors:

- Waltham MA, US
James M. Bowden - Forney TX, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 3/48
G01S 3/46

Abstract:

The concepts, systems and method described herein provide direction finding (DF) methods based on a minimum distance (MINDIST) search to principal components. In an embodiment, the method includes capturing samples of data from one or more array elements. The samples may be samples of a signal received at the array elements. The method includes generating a spatial sample covariance matrix (SCM) using the samples of data, extracting principal components from the SCM and generating a principal component table using angle and frequency measurement for each of the principal components. The method further includes determining a distance between a test point and each value in the principal component table and identifying a minimum distance point corresponding to a direction of the received signal. The minimum distance point may correspond to direction of arrival of a signal on the one or more array elements.

US Patent:

20190170848, Jun 6, 2019

Filed:

Feb 5, 2019

Appl. No.:

16/267824

Inventors:

- Waltham MA, US
James M. Bowden - Forney TX, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 3/04
G01S 3/74
G01S 3/48
G01S 11/02
G01S 3/14

Abstract:

In an array antenna having a plurality of subarrays, a direction finding system and technique includes receiving signals at an array antenna and capturing data with a plurality of groups of subarrays. Each group of subarrays may capture data during a selected one of a plurality of different dwell times. The method further includes generating a plurality of dwell spatial sample covariance matrices (SCMs) using data corresponding to one or more of the plurality of groups of subarrays and combining the plurality of dwell spatial SCMs in complex form to generate an aggregate covariance matrix (ACM). The ACM may then be used in subsequent processing with MINDIST technique to estimate a direction of a received signal based on the combined data.

US Patent:

20180074152, Mar 15, 2018

Filed:

Sep 9, 2016

Appl. No.:

15/260715

Inventors:

- Waltham MA, US
James M. Bowden - Forney TX, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 3/04
G01S 3/48
G01S 11/02

Abstract:

In an array antenna having a plurality of subarrays, a direction finding system and technique includes receiving signals at an array antenna and capturing data with a plurality of groups of subarrays. Each group of subarrays may capture data during a selected one of a plurality of different dwell times. The method further includes generating a plurality of dwell spatial sample covariance matrices (SCMs) using data corresponding to one or more of the plurality of groups of subarrays and combining the plurality of dwell spatial SCMs in complex form to generate an aggregate covariance matrix (ACM). The ACM may then be used in subsequent processing with MINDIST technique to estimate a direction of a received signal based on the combined data.

US Patent:

20180074153, Mar 15, 2018

Filed:

Sep 9, 2016

Appl. No.:

15/260508

Inventors:

- Waltham MA, US
James M. Bowden - Forney TX, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 3/48
G01S 11/02

Abstract:

The concepts, systems and method described herein provide direction finding (DF) methods based on a minimum distance (MINDIST) search to principal components. In an embodiment, the method includes capturing samples of data from one or more array elements. The samples may be samples of a signal received at the array elements. The method includes generating a spatial sample covariance matrix (SCM) using the samples of data, extracting principal components from the SCM and generating a principal component table using angle and frequency measurement for each of the principal components. The method further includes determining a distance between a test point and each value in the principal component table and identifying a minimum distance point corresponding to a direction of the received signal. The minimum distance point may correspond to direction of arrival of a signal on the one or more array elements.