System and method for rank estimation of electromagnetic emitters
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsCourt E. Rossman, Thomas R. Vaccaro
Life of this patent
Estimating the term…
Abstract
A system and method for rank estimation of electromagnetic emitters is provided. One aspect of the disclosure provides creating a graph of angles of arrival (AoAs) versus range and using a polynomial curve fit against the graph to determine a rank estimation of electromagnetic emitters. Another aspect of the disclosure provides using a search over parameters of the multiple polynomial curve fits, for each hypothesized rank, to optimize the rank estimation results. This search may be a greedy search to improve speed of convergence. Another aspect of the disclosure provides a metric ‘score’ to select the highest probability rank (number of emitters) based on the agreement between the multiple polynomial curve fits and residual AoA errors.
Claims20
A system for determining a rank estimation of electromagnetic emitters comprising:
- a moveable detection system;
- and
- a non-transitory computer-readable storage medium having instructions encoded thereon that, when executed by one or more processors, result in the following operations for determining rank estimation of electromagnetic emitters:
- measuring angles of arrival (AoAs) of at least one signal emitted from at least one electromagnetic emitter received at a detection system;
- estimating an accuracy of the measured AoAs by the detection system;
- assigning a track to the AoAs;
- creating a graph of the AoAs versus an estimated range or time;
- declaring a maximum set of hypothesized ranks;
- iteratively testing each rank of the set of hypothesized ranks by curve fitting a set of polynomial curves for each rank of the set of hypothesized ranks to the graph, wherein the number of polynomial curves is equal to the particular hypothesized rank;
- calculating hard scores for all combinations of coefficients for each of the polynomial curves for each rank of the set of the hypothesized ranks;
- storing only a maximum hard score and a set of coefficients for the maximum hard score for each of the hypothesized ranks;
- determining a rank estimation of the at least one electromagnetic emitter;
- and
- reporting the track associated with the at least one electromagnetic emitter.
A method for rank estimation of electromagnetic emitters comprising:
- moving a detection system in a trajectory;
- measuring angles of arrival (AoAs) of at least one signal emitted from at least one electromagnetic emitter received at the detection system;
- estimating an accuracy of the measured AoAs by the detection system;
- assigning a track to the AoAs;
- creating a graph of the AoAs versus estimated range or time;
- declaring a maximum set of hypothesized ranks;
- iteratively testing each rank of the set of hypothesized ranks by curve fitting a set of polynomial curves for each rank of the set of hypothesized ranks to the graph, wherein the number of polynomial curves is equal to the particular hypothesized rank;
- calculating hard scores for all combinations of coefficients for each of the polynomial curves for each rank of the set of hypothesized ranks;
- storing only a maximum hard score and a set of coefficients for the maximum hard score for each of the hypothesized ranks;
- determining a rank estimation of the at least one electromagnetic emitter;
- and
- reporting the track associated with the at least one electromagnetic emitter.
Dependencies are inferred from the claim text.