Knowledge aided detector
AssigneeRaytheon Canada Limited
InventorsJian Wang, Anthony M. Ponsford, Emily Wang
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Abstract
Various embodiments are described herein for a detector and method that perform various types of CFAR detection on radar data including knowledge-aided CFAR detection, hybrid-CFAR detection and simplified censored CFAR detection. Knowledge about the type of local environment of a Cell Under Test and the proximity of the Cell Under Test to various types of noise can be used to select particular types of CFAR detection methods or combinations thereof. In other instances, certain parameters of a CFAR detection method can be adapted based on this knowledge.
Claims36
A method of performing target detection in a radar system on a Cell Under Test (CUT) associated with a reference window of range-Doppler radar values, wherein the method comprises:
- by a detector of the radar system:
- determining if a local noise environment of the CUT is homogeneous or non-homogenous;
- and
- picking a size of the reference window based on whether the local noise environment is homogeneous or non-homogeneous;
- ordering the range-Doppler radar values in the reference window to produce ordered range-Doppler radar values;
- obtaining an average value of a percentage of the ordered range-Doppler radar values based on a percentage threshold;
- multiplying the average value by a threshold coefficient to obtain a first threshold value;
- and
- detecting a target if a radar value associated with the CUT is larger than the first threshold value.
A method of performing target detection in a radar system on a Cell Under Test (CUT) associated with a reference window of range-Doppler radar values, wherein the method comprises:
- by a detector of the radar system:
- obtaining a first threshold value according to a first different CFAR detection method comprising the steps of:
- ordering the range-Doppler radar values in the reference window to produce ordered range-Doppler radar values;
- obtaining an average value of a percentage of the ordered range-Doppler radar values based on a percentage threshold;
- and
- multiplying the average value by a threshold coefficient to obtain the first threshold value;
- obtaining a second threshold value according to a second different CFAR detection method;
- setting a third threshold value to the larger of the first and second threshold values;
- and
- detecting a target if a radar value associated with the CUT is larger than the third threshold.
A method of performing target detection in a radar system on a Cell Under Test (CUT) associated with a plurality of range-Doppler radar values, wherein the method comprises, by a detector of the radar system:
- classifying a local noise environment of the CUT using a first reference window;
- selecting a size and a shape of a second reference window based on the classified local noise environment of the CUT;
- selecting a type of Constant False Alarm Rate (CFAR) detection method and an orientation of the second reference window depending on a location of the CUT in relation to at least one of an ionospheric clutter region and a Bragg line;
- and
- applying the selected CFAR detection method to detect a target at the CUT in the second reference window.
Dependencies are inferred from the claim text.