Dismount harmonic acceleration matched filtering for enhanced detection and discrimination

• US 7,973,699 B2
• Filed: 03/31/2009
• Issued: 07/05/2011
• Est. Priority Date: 03/31/2009
• Status: Expired due to Fees

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Rosen, Robert, Krikorian, Kapriel, Krikorian, Mary
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): Barker; Matthew M
• Application Number:
  US12/416,073
• Publication Number:
  US 20100245152A1
• Time in Patent Office: 826 Days
• Field of Search: 342/28, 342/90
• US Class Current: 342/28
• CPC Class Codes: G01S 13/89 for mapping or imaging
• CPC Class Codes: G01S 7/415 Identification of targets based on measurements of movement associated with the target

Abstract

A process for detecting the harmonic motion characterizing a desired target. An exemplary method includes generating a radar image of the target utilizing a pulse doppler radar. A plurality of matched filter signals are generated in the receiver, each matched filter signal corresponding to a doppler profile of harmonic acceleration for the desired target. The matched filter signals are generated by an array of matched filters, with each matched filter signal corresponding to a predetermined doppler profile. The received radar image is then correlated to the matched filter signals to detect the desired target.

Claims

1. A method of detecting harmonic motion of a target, comprising:

generating a radar image of the target;

generating a plurality of matched filter signals corresponding to a doppler profile of harmonic acceleration for a desired target; and

correlating the radar image of the target to the matched filter signal to detect the harmonic motion of the target.

2. The method according to claim 1, wherein the plurality of matched filter signals are adapted to represent a range of doppler profiles of a corresponding range of desired targets.

3. The method according to claim 2, wherein generating a plurality of matched filter signals comprises utilizing an array of matched filters, each matched filter being configured to generate a matched filter signal corresponding to a predetermined doppler profile, the array representing the range of doppler profiles by representing discrete values of variables of motion of the desired targets.

4. The method according to claim 3, wherein the desired target comprises a dismount, and the plurality of matched filter signals comprise a harmonic acceleration compensation voltage vh_{k, j} having a harmonic acceleration compensation phase angle φ

h_k,j, wherein φ

h_k,j is a function of the variables of motion of the desired target, such that;

vh_k,j=e<sup>−

i·

φ

hk,j</sup>, and

5. The method according to claim 4, wherein the range of doppler profiles is adapted to represent dismounts across a range of at least one of the variables of motion Tstep, Rdot, or φ

q.

6. The method according to claim 5, further comprising transforming the radar image to the time domain prior to correlating the radar image to the matched filter signal.

7. The method according to claim 6, further comprising generating a frequency domain signal by transforming to the frequency domain an output of correlating the radar image to the matched filter signal.

8. The method according to claim 7, further comprising indicating the presence of the dismount when the frequency domain signal is greater than a threshold.

9. The method according to claim 8, wherein generating a radar image comprises measuring a doppler profile of the target by utilizing a pulse doppler radar.

10. The method according to claim 9, further comprising coherently combining a plurality of sequential outputs of the correlation of the radar image to the matched filter signal, for increasing a doppler resolution of the harmonic motion of the dismount.

11. The method according to claim 10, wherein coherently combining the plurality of sequential outputs comprises partially overlapping adjacent ones of the sequential outputs.

12. A method of detecting harmonic motion of a target, comprising:

generating a radar image of the target;

generating a plurality of matched filter signals from a plurality of matched filters, respectively, wherein the plurality of matched filter signals correspond to a doppler profile of harmonic acceleration for a desired target, and wherein the plurality of matched filters comprise a three-dimensional grid such that, in a first dimension, a step period of the target is varied, in a second dimension, a phase quantization is varied, and in a third dimension, a range rate of the target is varied; and

correlating the radar image to the matched filter signal.

13. The method according to claim 12, wherein the plurality of matched filter signals are adapted to represent a range of doppler profiles of a corresponding range of desired targets.

14. The method according to claim 13, wherein generating a plurality of matched filter signals comprises utilizing an array of matched filters, each matched filter being configured to generate a matched filter signal corresponding to a predetermined doppler profile, the array representing the range of doppler profiles by representing discrete values of variables of motion of the desired targets.