On-body concealed weapon detection system
First Claim
1. A method for detecting a weapon, the method comprising:
- emitting a radiofrequency signal stream into a region of interest;
receiving a scattered signal stream from the region of interest, the scattered signal stream generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest;
identifying a late time response portion of the scattered signal stream and an early time response portion of the scattered signal stream;
identifying a plurality of resonant signal components from the late time response portion of the scattered signal stream;
generating a plurality of preprocessed resonant signal components by removing at least one signal component from the plurality of resonant signal components, the at least one signal component corresponding to stored resonant environmental signal components for the region of interest;
determining a target assessment from the plurality of preprocessed resonant signal components and the early time response portion of the scattered signal stream using a statistical model that is based on resonant signals and early-time responses associated with the weapon, wherein the statistical model is generated using a training database having a first dataset with a first plurality of resonant signal components and early time responses associated with the weapon and a second dataset with a second plurality of resonant signal components and early time responses associated with a generic target when the weapon is not present on the generic target; and
triggering a target response if the target assessment indicates the weapon is detected on the target.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for detecting weapons. A radiofrequency transmitter transmits an RF signal stream into a region of interest. An RF receiver receives a scattered signal stream from the region of interest. The scattered signal stream is generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest. A plurality of resonant signal components are identified from the scattered signal stream. Preprocessed resonant signal components are generated by removing environmental signal components. A target assessment is determined from the preprocessed resonant signal components using a trained statistical model. A target response is triggered if the target assessment indicates that a weapon is detected on the target.
24 Citations
18 Claims
-
1. A method for detecting a weapon, the method comprising:
-
emitting a radiofrequency signal stream into a region of interest; receiving a scattered signal stream from the region of interest, the scattered signal stream generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest; identifying a late time response portion of the scattered signal stream and an early time response portion of the scattered signal stream; identifying a plurality of resonant signal components from the late time response portion of the scattered signal stream; generating a plurality of preprocessed resonant signal components by removing at least one signal component from the plurality of resonant signal components, the at least one signal component corresponding to stored resonant environmental signal components for the region of interest; determining a target assessment from the plurality of preprocessed resonant signal components and the early time response portion of the scattered signal stream using a statistical model that is based on resonant signals and early-time responses associated with the weapon, wherein the statistical model is generated using a training database having a first dataset with a first plurality of resonant signal components and early time responses associated with the weapon and a second dataset with a second plurality of resonant signal components and early time responses associated with a generic target when the weapon is not present on the generic target; and triggering a target response if the target assessment indicates the weapon is detected on the target. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for detecting a weapon, the system comprising:
-
a radiofrequency transmitter having at least one transmission antenna, the radiofrequency transmitter configured to emit a radiofrequency signal stream into a region of interest using the at least one transmission antenna; a radiofrequency receiver having at least one reception antenna, the radiofrequency receiver configured to receive a scattered signal stream from the region of interest using the at least one reception antenna, the scattered signal stream generated in the region of interest from the radiofrequency signal stream emitted by the radiofrequency transmitter when a target is at least partially within the region of interest; a data storage unit storing resonant environmental signal components for the region of interest, a training database having a first dataset with a first plurality of resonant signal components and early time responses associated with the weapon and a second dataset with a second plurality of resonant signal components and early time responses associated with a generic target when the weapon is not present on the generic target, and a statistical model based on resonant signals and early-time responses associated with the weapon, wherein the statistical model is generated using the training database; and a controller coupled to the radiofrequency transmitter, the radiofrequency receiver, and the data storage unit, the controller configured to; identify a late time response portion of the scattered signal stream and an early time response portion of the scattered signal stream; identify a plurality of resonant signal components from the late time response portion of the scattered signal streams; generate a plurality of preprocessed resonant signal components by removing at least one signal component from the plurality of resonant signal components, the at least one signal component corresponding to the stored resonant environmental signal components; determine a target assessment from the plurality of preprocessed resonant signal components and the early time response portion of the scattered signal stream using the statistical model; and trigger a target response if the target assessment indicates the weapon is detected on the target. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A non-transitory, computer-readable storage medium storing instructions executable by a processor coupled to the storage medium, the instructions for programming the processor to:
-
emit a radiofrequency signal stream into a region of interest using a radiofrequency transmitter; receive a scattered signal stream from the region of interest using a radiofrequency receiver, the scattered signal stream generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest; identify a late time response portion of the scattered signal stream and an early time response portion of the scattered signal stream; identify a plurality of resonant signal components from the late time response portion of the scattered signal stream; generate a plurality of preprocessed resonant signal components by removing at least one signal component from the plurality of resonant signal components, the at least one signal component corresponding to stored resonant environmental signal components for the region of interest; determine a target assessment from the plurality of preprocessed resonant signal components and the early time response portion of the scattered signal stream using a statistical model that is based on resonant signals and early-time responses associated with the weapon, wherein the statistical model is generated using a training database having a first dataset with a first plurality of resonant signal components and early time responses associated with the weapon and a second dataset with a second plurality of resonant signal components and early time responses associated with a generic target when the weapon is not present on the generic target; and trigger a target response if the target assessment indicates the weapon is detected on the target.
-
Specification