SYSTEM AND METHOD FOR DETECTION AND TRACKING OF TARGETS

• US 20090073028A1
• Filed: 08/13/2008
• Published: 03/19/2009
• Est. Priority Date: 06/06/2000
• Status: Abandoned Application

• Current Assignee: Signal Labs Incorporated
• Original Assignee: Signal Labs Incorporated
• Inventors: Ozdemir, Ahmet Kemal, Arikan, Orhan
• Application Number:
  US12/191,002
• Publication Number:
  US 20090073028A1
• Time in Patent Office: Days
• US Class Current: 342/196
• CPC Class Codes: G01S 13/524 based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
• CPC Class Codes: G01S 7/295 Means for transforming co-ordinates or for evaluating data, e.g. using computers

Abstract

System and method for detection and tracking of targets, which in a preferred embodiment is based on the use of fractional Fourier transformation of time-domain signals to compute projections of the auto and cross ambiguity functions along arbitrary line segments. The efficient computational algorithms of the preferred embodiment are used to detect the position and estimate the velocity of signals, such as those encountered by active or passive sensor systems. Various applications of the proposed algorithm in the analysis of time-frequency domain signals are also disclosed.

Claims

1. A method for estimating one or more samples of a cross ambiguity function of a first signal and a second signal, the method comprising:

acquiring the first signal;

computing fractional Fourier transform of the first signal; and

estimating one or more samples of the cross-ambiguity function based on the computed fractional Fourier transforms of the first signal and a fractional Fourier transform of the second signal.

2. The method of claim 1, wherein the step of estimating is further based on using a chirp-z transform.

3. The method of claim 2 further comprising computing fractional Fourier transform of the second signal.

4. The method of claim 1, wherein the fractional Fourier transform of the second signal is computed in advance.