Knowledge-aided covariance matrix estimation: a MAXDET approach
- 1 January 2009
- journal article
- Published by Institution of Engineering and Technology (IET) in IET Radar, Sonar & Navigation
- Vol. 3 (4), 341-356
- https://doi.org/10.1049/iet-rsn.2008.0153
Abstract
The authors consider the problem of knowledge-aided covariance matrix estimation and its application to adaptive radar detection. The authors assume that an a priori (knowledge-based) estimate of the disturbance covariance M, derived from a physical scattering model of the terrain and/or of the environment, is available. Hence, starting from a set of secondary data, the authors evaluate the maximum likelihood (ML) estimate of M assuming that it lies in a suitable neighbourhood of the a priori estimate and formulate this ML estimation in terms of a convex optimisation problem which falls within the class of MAXDET problems. Both the cases of unstructured and structured disturbance covariance are considered. At the analysis stage, the authors assess the performance of the new knowledge-aided covariance estimators both in terms of estimation error and detection probability achievable by a class of adaptive detectors. The results highlight that, if the a priori knowledge is reliable, satisfactory levels of performance can be achieved with considerably less training data than those exploited by conventional algorithms.Keywords
This publication has 33 references indexed in Scilit:
- Knowledge-aided signal processing: a new paradigm for radar and other advanced sensorsIEEE Transactions on Aerospace and Electronic Systems, 2006
- Improved clutter mitigation performance using knowledge-aided space-time adaptive processingIEEE Transactions on Aerospace and Electronic Systems, 2006
- Knowledge-aided adaptive radar at DARPA: an overviewIEEE Signal Processing Magazine, 2006
- Demonstration of knowledge-aided space-time adaptive processing using measured airborne dataIEE Proceedings - Radar, Sonar and Navigation, 2006
- KB-GLRT: exploiting knowledge of the clutter ridge in airborne radarIEE Proceedings - Radar, Sonar and Navigation, 2005
- Airborne/spacebased radar STAP using a structured covariance matrixIEEE Transactions on Aerospace and Electronic Systems, 2003
- Performance of adaptive optimal Doppler processors in heterogeneous clutterIEE Proceedings - Radar, Sonar and Navigation, 1995
- A CFAR adaptive matched filter detectorIEEE Transactions on Aerospace and Electronic Systems, 1992
- An Adaptive Detection AlgorithmIEEE Transactions on Aerospace and Electronic Systems, 1986
- Rapid Convergence Rate in Adaptive ArraysIEEE Transactions on Aerospace and Electronic Systems, 1974