System and method for measurement domain data association in passive coherent location applications
First Claim
1. A method for associating a detection report having measurements to a line track, wherein said line track correlates to a signal transmitted from a source of opportunity, reflected from a target, and detected by a passive coherent location system, comprising:
- estimating a line track state vector from said measurements using a set of Kalman filters wherein said measurements are at least partially derived by comparing said signal to a reference transmission from said source of opportunity; and
initializing said line track.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for measurement domain data association in a passive coherent location system is disclosed. According to the system and method, detection reports are received and associated with line tracks. The detection reports correlate to target signals received at the passive coherent location system. Measurements of the detection report correlate to the data of the target signals. A line track state estimation function associates new detection reports with the line tracks and estimates update states for the line tracks. A signal type is determined. Kalman filters are selected for the measurements according to the signal type. Measurement residuals are computed for the detection reports according to the Kalman filters. The detection reports are selected for association with the line tracks according to the residuals. The line tracks can be merged or terminated during updates according to specific criteria. Further, new line tracks are initialized as new targets are detected.
-
Citations
41 Claims
-
1. A method for associating a detection report having measurements to a line track, wherein said line track correlates to a signal transmitted from a source of opportunity, reflected from a target, and detected by a passive coherent location system, comprising:
-
estimating a line track state vector from said measurements using a set of Kalman filters wherein said measurements are at least partially derived by comparing said signal to a reference transmission from said source of opportunity; and
initializing said line track. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for associating measurement data to a line track correlating to a target, wherein a target signal is reflected from said target and is received by a passive coherent location system, comprising:
-
determining a signal type for said signal;
converting said measurement data to filter data according to said signal type;
selecting a set of Kalman filters for said filter data according to said signal type;
propagating said line track;
identifying a detection report for said line track according to said measurement data;
computing measurement residuals and residual variances for said detection report according to said Kalman filters; and
selecting said detection report for association with said line track according to said residuals. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
-
19. A system for measurement data association of detection reports to a line track within a passive coherent location system, wherein said detection reports correlate to target signals transmitted from a source of opportunity, reflected from a target, and received at said passive coherent location system, comprising:
-
a state estimation means to associate new detection reports with existing line tracks and to estimate update states for extending line tracks, wherein said new detection reports are at least partially derived by comparing said target signal to a reference transmission from said source of opportunity;
a line track merge means to merge line tracks;
a line track termination means to terminate line tracks according to a specified criteria; and
a line track initialization means to initiate new line tracks for unassociated detection reports. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A method for estimating line track states with detection association in a passive coherent location system, wherein said passive coherent location system receives target signals reflected from targets, said target signals having measurement values, comprising:
-
identifying a set of potential detection reports, wherein said detection reports comprises measurement values;
computing measurement residuals and residual variances for said measurement values;
selecting candidate detection reports for line tracks from said set of potential detection reports according to said measurement residuals;
applying thresholds to said candidate detection reports; and
associating said candidate detection reports passing said thresholds to said line tracks. - View Dependent Claims (30, 31)
-
-
32. A method for associating new detection reports with existing line tracks in a passive coherent location system, comprising:
-
gating a detection report-line track pair;
computing a score for said detection report-line track pair; and
assigning a detection report of said detection report-line track pair to a line track of said detection report-line track pair according to said score. - View Dependent Claims (33, 34)
-
-
35. A method for merging line tracks within a passive coherent location system, wherein said line tracks correlate to a target, comprising:
-
determining a list of line tracks and line track pairs;
calculating a measurement residual for each line track pair within said list;
determining merge criteria for said each line track pair;
comparing said measurement residual with gates correlating to said merge criteria; and
removing a line track from said each line track pair that satisfies said merge criteria. - View Dependent Claims (36, 37)
-
-
38. A method for terminating a line track within a passive coherent location system, wherein said line track correlates to a target signal transmitted from one or more sources of opportunity, reflected from a target, and received by said passive coherent location system, comprising:
-
determining a termination criteria;
monitoring said line track using comparison data from said target signal and a reference transmission from said source of opportunity; and
terminating said line track when said line track achieves said termination criteria.
-
-
39. A method for initializing new line tracks within a passive coherent location system, comprising:
-
determining a configuration parameter for a new line track;
selecting an initialization process according to said configuration parameter;
performing said initialization process; and
initializing a filter state of said new line track. - View Dependent Claims (40, 41)
-
Specification