Radar apparatus and processing method for detecting human carried explosive devices
First Claim
1. A standoff detection method for human carried explosive (HCE) devices, comprising the steps of:
- transmitting a beam of polarized radar energy that illuminates a moving pedestrian-of-interest;
receiving return radar energy in a manner to produce co-polarized and cross-polarized target echo signals that are isolated in target range;
doppler processing said target echo signals to map co-polarized and cross-polarized target echo responses as a function of target range and target velocity;
identifying portions of the mapped co-polarized and cross-polarized target echo responses that correspond to the moving pedestrian-of-interest; and
evaluating the identified portions of the mapped co-polarized and cross-polarized target echo responses to determine if the pedestrian-of-interest is carrying an HCE device.
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Accused Products
Abstract
A linear FM pulse radar with Doppler processing of co-polarized and cross-polarized radar return signals isolates the target echo signal content associated with a moving pedestrian to provide high quality target echo data for standoff HCE detection based on polarimetric signature analysis. Baseband co-polarized and cross-polarized radar return signals are repeatedly and coherently integrated across numerous successive radar return pulses to create co-polarized and cross-polarized range vs. velocity (Doppler) data maps. The co-polarized data map is used to identify a moving pedestrian, and co-polarized and cross-polarized data subsets corresponding to the identified pedestrian are extracted and subjected to polarization signature analysis to determine if the pedestrian is bearing explosive devices. Low pass filtering of the of the baseband co-polarized and cross-polarized radar return signals prior to integration provides range aliasing to reject signal content associated with objects beyond the unambiguous range of the radar apparatus.
58 Citations
15 Claims
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1. A standoff detection method for human carried explosive (HCE) devices, comprising the steps of:
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transmitting a beam of polarized radar energy that illuminates a moving pedestrian-of-interest;
receiving return radar energy in a manner to produce co-polarized and cross-polarized target echo signals that are isolated in target range;
doppler processing said target echo signals to map co-polarized and cross-polarized target echo responses as a function of target range and target velocity;
identifying portions of the mapped co-polarized and cross-polarized target echo responses that correspond to the moving pedestrian-of-interest; and
evaluating the identified portions of the mapped co-polarized and cross-polarized target echo responses to determine if the pedestrian-of-interest is carrying an HCE device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for standoff detection of human carried explosive (HCE) devices, comprising the steps of:
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a radar transmitter for emitting a beam of polarized radar energy that illuminates a moving pedestrian-of-interest;
a radar receiver for receiving reflected radar energy and producing co-polarized and cross-polarized target echo signals that are isolated in target range; and
a signal processor for doppler processing said co-polarized and cross-polarized target echo signals to map co-polarized and cross-polarized target echo responses as a function of target range and target velocity, for identifying portions of the mapped co-polarized and cross-polarized target echo responses that correspond to the moving pedestrian-of-interest, and for evaluating the identified portions of the mapped co-polarized and cross-polarized target echo responses to determine if the pedestrian-of-interest is carrying an HCE device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification