Accession Number : ADA296884

Title :   Real-Time DOA Estimation of Wideband Signals with Multidimensional Arrays via Signal Subspace Techniques.

Descriptive Note : Final rept. 1 Apr 92-15 May 95,

Corporate Author : PURDUE UNIV LAFAYETTE IN

Personal Author(s) : Zoltowski, Michael D.

PDF Url : ADA296884

Report Date : 16 JUN 1995

Pagination or Media Count : 132

Abstract : 2D Unitary ESPRIT is developed as a closed-form 2-D angle estimation algorithm for use in conjunction with a uniform rectangular array (URA). In the final stage of the algorithm, the real and imaginary parts of the i-th eigenvalue of a matrix are one-to-one related to the respective direction cosines of the i-th source relative to the two major array axes. Reduced dimension beamspace implementations of 2D Unitary ESPRIT are developed along with adaptations for other array configurations including two orthogonal linear arrays. A novel approach to angle estimation in beamspace is also developed based on the observation that beamspace noise eigenvectors may be transformed to vectors in the element-space noise subspace. The transformed noise eigenvectors are bandpass, facilitating multirate processing involving modulation to baseband, filtering, and decimation. As these operations are linear, the Root-MUSIC (ESPRIT) based algorithm merely premultiples each beamspace noise (signal) eigenvector by a precomputed transformation matrix. Compared to previous beamspace implementations of Root-MUSIC or ESPRIT, this approach places no restrictions on the structure of the matrix beamformer. Extensions for the URA are developed based on Multidimensional multirate processing. (AN)

Descriptors :   *ALGORITHMS, *SIGNAL PROCESSING, *ANTENNA ARRAYS, COMPUTER PROGRAMS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, DATA PROCESSING, REAL TIME, TWO DIMENSIONAL, MATRICES(MATHEMATICS), SIGNAL TO NOISE RATIO, ANGLE OF ARRIVAL, EIGENVECTORS, DIRECTION FINDING, ESTIMATES, TRANSFORMATIONS(MATHEMATICS), FREQUENCY BANDS, RECTANGULAR BODIES, BROADBAND, BEAM FORMING, COMPLEX NUMBERS, NOISE REDUCTION, LINEAR ARRAYS, ELEVATION, AZIMUTH, PLANE WAVES, ORTHOGONALITY.

Subject Categories : Electrical and Electronic Equipment
      Computer Programming and Software
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE