Communications: directive radio wave systems and devices (e.g. – Clutter elimination – Mti
Reexamination Certificate
2001-03-13
2002-12-03
Lobo, Ian J. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
Mti
C342S160000
Reexamination Certificate
active
06489918
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
This application claims the priority of Germany priority document 100 12 411.9, filed Mar. 13 2000, the disclosure of which is expressly incorporated by reference herein.
The invention relates to a process for computing the coefficients of a space-time adaptive processing (STAP) filter, and for filtering radar source data of the distance Doppler matrices of two adjacent reception channels by means of space-time adaptive processing.
Radar source data consist of a mixture of signals (such as echoes from moving and stationary targets) and interferences (such as noise). As a rule, when analyzing these radar source data, interferences are to be suppressed so that the signals can be easily detected.
To improve the detection of moving targets (or example, in SAR images), it is necessary to suppress interference signals as well as signals which originate from stationary targets. A suitable process for this purpose is space-time adaptive processing (STAP). In known processes for this purpose, the radar source data are as a rule filtered in the time domain.
It is an object of the invention to compute and implement in a simple manner, within the scope of the STAP processing, the filter coefficients and the filtering of the radar source data of the distance Doppler matrices {right arrow over (X)}
left
and {right arrow over (X)}
right
of two reception channels, so that use of this STAP filter is permitted in real-time systems.
This and other objects and advantages are achieved by the process according to the invention, in which in contrast to conventional STAP filters, computation of the coefficients and the filtering is performed exclusively in the frequency domain. Similar to the ‘fast folding’, a considerable advantage is therefore obtained with respect to the necessary processor performance.
The theoretical basis of the process according to the invention resides in the proposition that the Doppler frequency and the phase difference are correlated in the case of typical SAR source data, in the signal spectrum of two adjacent channels.
REFERENCES:
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patent: 5748143 (1998-05-01), Melvin, Jr.
patent: 5907302 (1999-05-01), Melvin, Jr.
Ward, J. “Space-Time Adaptive Processing for Airborne Radar”, Space-Time Adaptive Processing (Ref. No. 1998/241), IEE Colloquium on, 1998, pp.: 2/1-2/6.*
Farina, A.; Timmoneri, L. “Real-time STAP techniques”, Space-Time Adaptive Processing (Ref. No. 1998/241), IEE Colloquium on, 1998, pp.: 3/1-3/7.*
Richmond, C. D., “The theoretical performance of a class of space-time adaptive detection and training strategies for airborne radar”, Signals, Systems and Computers, 1998 Conference record..*
Richardson, P.G., “Space-time adaptive processing for manoeuvring airborne radar”, Electronics & Communication Engineerin Journal, vol.: 11 issue: 1, Feb. 1999, pp.: 57-63.*
Jackson D. Bigham, Jr., “A Highly Parallel Signal Processor” IEEE, 1990.
J. H. G. Ender, “The Airborne Experimental Multi-Channel SAR-System AER-II” EUSAR, 1996.
Copy of the International Search Report.
Bickert Bernhard
Meyer-Hilberg Jochen
Crowell & Moring LLP
EADS Deutschland GmbH
Lobo Ian J.
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