Using Orthogonal Space Projections to Generate a Constant False Alarm Rate Control Parameter

摘要

An adaptive parameter for adjusting a threshold in a sensor system that provides a constant false alarm rate is disclosed. A projection space generator performs projection operations to create a matched projection space and first and second mismatched projection spaces such that each mismatched projection space is orthogonal or nearly orthogonal to the matched projection space. A mitigator engine receives the matched and first mismatched projection spaces and generates a covariance matrix from the first mismatched projection space and an image space from the covariance matrix and the matched projection space. A second mismatched projection space that is mismatched to both the matched and first mismatched projection spaces is provided to a clutter characterization engine that generates samples from the second mismatched projection space and the covariance matrix. The adaptive parameter is generated from the samples and is used as an input to a threshold adjuster in a target detector.

主权项

1. A system that creates an adaptive control parameter in a sensor processor that determines a detection threshold for desired signals-of-interest, the system comprising:
a projection space generator arranged to perform a first projection operation and a second projection operation on a received signal to generate a matched projection space and a first mismatched projection space, respectively, such that the mismatched projection space is orthogonal or nearly orthogonal to the matched projection space, the mismatched projection space including non-desired signal energy and a reduced or removed desired signal energy; a mitigator engine arranged to receive the matched projection space and the mismatched projection space, the mitigator engine configured to generate a covariance matrix from the first mismatched projection space and an image space from the covariance matrix and the matched projection space; a clutter characterization engine generated from a second mismatched projection that is mismatched to both the matched and first mismatched projection spaces and the covariance matrix, the clutter characterization engine configured to generate samples of non-desired signal energy when present; and a parameter generator arranged to receive the samples and configured to generate a control parameter for a threshold adjuster.