US 12,487,349 B2
Generalized angle-based tracker (GABT)
Matthew Anderson, Mont Vernon, NH (US); and Bradley J. Bell, Manchester, NH (US)
Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed by BAE SYSTEMS Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed on Oct. 13, 2022, as Appl. No. 17/965,400.
Prior Publication US 2024/0142602 A1, May 2, 2024
Int. Cl. G01S 13/68 (2006.01); G01S 13/526 (2006.01)
CPC G01S 13/68 (2013.01) [G01S 13/526 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for a Radio Frequency (RF) generalized angle-based tracker using only angle-based information from a target emitter source, whereby a type of said target is determined comprising:
a memory storing instructions which when interpreted by a processor cause the processor to perform the steps of:
receiving signal data in real-time from a source target emitter signal;
determining angle-based information for said target emitter source from said received signal;
initializing a Stationary Surface Filter (SSF), a Moving Surface Filter (MSF), and a Pseudorange Kalman Filter (PKF) with said angle-based information;
scoring said SSF and MSF by said PKF, whereby if said angle-based information is associated by exceeding a likelihood ratio threshold, then update said SSF, said MSF, and said PKF;
determining if at least one plausible, nonzero likelihood, Constituent Kalman Filter (CKF) exists for each of said SSF and said MSF;
if at least one plausible, nonzero likelihood, CKF exists for said SSF and no CKF exists for said MSF, then classify said target as a surface-level stationary target;
if at least one plausible, nonzero likelihood, CKF exists for said MSF and no CKF exists for said SSF, then classify said target as a surface-level moving target;
if no plausible, nonzero likelihood, CKF exists for both said SSF and said MSF, then classify said target as an airborne moving target;
if said angle-based information is not associated, due to likelihood values of zero, then receive a subsequent signal from said target emitter source and determine angle-based information for said target emitter source from said received signal, and initiate said SSF, MSF, and PKF;
whereby said type of said target is provided to a user.