Short Data Record Adaptive Filtering: The Auxiliary-Vector Algorithm

Karystinos, George N.; Qian, Haoli; Medley, Michael J.; Batalama, Stella N.

doi:10.1006/dspr.2002.0450

Cited by 3 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Maximizing (2) is equivalent to minimizing 1/SINR, as follows: (4) Observing that the cost function above is unaltered when is scaled, we can impose, without a loss of generality, the constraint , which can always be achieved by scaling . Hence, the maximization of the output SINR is equivalent to subject to (5) The solution to (5) is the well-known MVDR beamformer, given by solving (6) where serves to satisfy the unity gain constraint in (5).…”

Section: Mvdr Beamformingmentioning

confidence: 99%

“…To maximize performance in a nonstationary scenario, adaptive beamforming (ABF) is necessary. In rapidly changing scenarios, only a limited number of snapshots is available to estimate the covariance matrix; under these circumstances, the low-rank minimum variance distortionless response (MVDR) equations yield faster convergence in terms of the signal-to-interference-plus-noise ratio (SINR) performance than the full-rank MVDR beamformer [2]- [5]. Owsley [6] introduced dominant mode rejection (DMR) low-rank ABF.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Indirect Dominant Mode Rejection: A Solution to Low Sample Support Beamforming

Santos

Zoltowski

Rangaswamy

2007

IEEE Trans. Signal Process.

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) 20-08-20072. TYPE REPORT (From -To) JOURNAL ARTICLE DATES COVERED SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Electromagnetics Technology Division SC: 437490 SPONSOR/MONITOR'S ACRONYM(S)Sensors Directorate AFRL-SN-HS Air Force Research Laboratory 80 Scott Drive Hanscom AFB MA 01731-2909 SPONSOR/MONITOR'S REPORT NUMBER(S) AFRL-SN-HS-TP-2007-0006 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTThe work developed and described in this technical report deals with the problem of providing a statistical model of the backscattering from lake surface for low-grazing angle and high resolution radar systems. First described is a statistical analysis of the amplitude of the high-resolution polarimetric data characterized by different radar looking directions with respect to the wind blowing directions. Then, based on the electromagnetic two-scale model, analyzed were both the amplitude and frequency modulations induced on the small-scale Bragg resonant waves by the large-scale surface tilt and advection, due to the swell presence. Our results confirm the lake clutter non-stationarity already found in previous analysis of other sea and lake clutter data. Moreover, the relationship between the variation of clutter spectral features, like texture, Doppler centroid and bandwidth, have been investigated by processing real recorded data. The data used for the research activity have been recorded by the IPIX radar of McMaster University in Grimsby, Ontario, Canada in 1998. SUBJECT TERMSStatistical analysis lake surface scattering, high-resolution polarimetric data characterization, small-scale Bragg resonant waves, lake clutter non-stationarity Abstract-Under conditions of low sample support, a low-rank solution of the minimum variance distortionless response (MVDR) equations can yield a higher output signal-to-interference-plus-noise ratio (SINR) than the full-rank MVDR beamformer. In this paper, we investigate several low-rank beamforming techniques, and we also propose a new beamformer that we refer to as the indirec...

show abstract