Radar imaging system and method using gradient magnitude second moment spatial variance detection
First Claim
1. A radar system comprising:
- a radar antenna;
a transmitter;
a receiver;
circulator means for coupling said transmitter and receiver to said antenna;
an image processor coupled to said receiver; and
a detection processor coupled to said image processor, said detection processor having;
software for receiving a frame of image data;
software for performing a rate of change of variance calculation with respect to at least one pixel in said frame of image data; and
software for comparing said calculated rate of change of variance with a predetermined threshold to provide output data.
1 Assignment
0 Petitions
Accused Products
Abstract
A detection system and method. The inventive system includes an arrangement for receiving a frame of image data; an arrangement for performing a rate of change of variance calculation with respect to at least one pixel in said frame of image data; and an arrangement for comparing said calculated rate of change of variance with a predetermined threshold to provide output data. In the illustrative embodiment, the frame of image data includes a range/Doppler matrix of N down range samples and M cross range samples. In this embodiment, the arrangement for performing a rate of change of variance calculation includes an arrangement for calculating a rate of change of variance over an N×M window within the range/Doppler matrix. The arrangement for performing a rate of change of variance calculation includes an arrangement for identifying a change in a standard deviation of a small, localized sampling of cells. In accordance with the invention, the arrangement for performing a rate of change of variance calculation outputs a rate of change of variance pixel map.
46 Citations
7 Claims
-
1. A radar system comprising:
-
a radar antenna; a transmitter; a receiver; circulator means for coupling said transmitter and receiver to said antenna; an image processor coupled to said receiver; and a detection processor coupled to said image processor, said detection processor having; software for receiving a frame of image data; software for performing a rate of change of variance calculation with respect to at least one pixel in said frame of image data; and software for comparing said calculated rate of change of variance with a predetermined threshold to provide output data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification
-
- Resources
-
Current AssigneeRaytheon Company (Rtx Corporation)
-
Original AssigneeRaytheon Company (Rtx Corporation)
-
InventorsTreece, John B., Bruyere, Donald P., Ashcraft, Ivan S.
-
Primary Examiner(s)GREGORY, BERNARR E
-
Application NumberUS11/975,393Publication NumberTime in Patent Office1,482 DaysField of Search342/21, 342/22, 342 25 R- 25 F, 342/175, 342/176, 342/179, 342192-197, 342 89-103, 342159-164, 342 26 R- 26 D, 342 70- 72, 702/127, 702189-199, 382/100, 382/107, 382/162, 382/165, 382/181, 382/190, 382/195, 382/201, 382/232, 382/236US Class Current342/179CPC Class CodesG01S 13/9004 SAR image acquisition techn...G01S 7/411 Identification of targets b...
