Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1996-01-25
1999-02-23
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
455137, G01S 316, G01S 328
Patent
active
058749160
ABSTRACT:
A digital signal processing system for obtaining accurate time delay of arrival (TDOA) and frequency delay of arrival (FDOA) measuremets of a signal of interest in a dense interfering signal environment is provided. A time series of cross-spectra (called a waterfall in the art) are computed from transforms applied to overlapping data sets comprising two received digital data streams, which include the signal from an emitter of interest and one or more partially overlapping interfering signals. For each cross-spectra frequency, a transform is calculated in the time direction to create a frequency difference of arrival dimension. Regions within the transformed cross-spectrum that are associated with individual emitters are then identified based on the fact that a given emitter's transformed cross-spectrum phase changes linearly with frequency near the peak FDOA for the emitter. The frequency region(s) associated with the emitter of interest are selected based on the approximate frequency and bandwidth information provided. Applying an inverse transform for the frequencies, identified as associated with the emitter of interest, creates a time difference of arrival dimension corresponding to each frequency difference of arrival value.
REFERENCES:
patent: 5168459 (1992-12-01), Hiller
patent: 5285280 (1994-02-01), Teng et al.
patent: 5347586 (1994-09-01), Hill et al.
patent: 5410621 (1995-04-01), Hyatt
patent: 5594452 (1997-01-01), Webber et al.
Blum Theodore M.
Lockheed Martin Corporation
LandOfFree
Frequency selective TDOA/FDOA cross-correlation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency selective TDOA/FDOA cross-correlation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency selective TDOA/FDOA cross-correlation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-311043