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 mitigation engine receives the matched and first mismatched projection spaces and generates a set of weights from one of the first mismatched projection space or both of the matched and first mismatched projection spaces. 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 set of weights. 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 first mismatched projection space is orthogonal or nearly orthogonal to the matched projection space, the first mismatched projection space including non-desired signal energy and a suppressed desired signal energy; a mitigation engine arranged to receive the matched projection space and the first mismatched projection space, the mitigation engine configured to suppress non-desired signal energy in the matched projection space and generate an image space containing a desired signal; a clutter characterization engine responsive to a second mismatched projection space that is mismatched to both the matched and the first mismatched projection spaces, the clutter characterization engine configured to generate samples of non-desired signal energy when present; a parameter generator arranged to receive the samples and configured to generate a control parameter; a threshold adjuster arranged to receive the control parameter and configured to generate a threshold; and a target detector arranged to apply the threshold to the image space to detect one or more signals.