Title :
Superresolution effects in broadband antenna arrays
Author :
Nordholm, S. ; Claesson, I. ; Eriksson, P.
Author_Institution :
Lund Univ., Sweden
Abstract :
The problem of finding the angular 3-dB beamwidth for a wideband Griffiths-Jim adaptive beamformer is discussed. Approximate analytic expressions are presented and their relation to the Cramer-Rao bound (CRB) is considered. Results on the CRB in direction of arrival estimation for a sinusoidal signal are extended to narrowband and broadband signals, together with simple interpretations of their behavior. Superresolution results with a five-element array for three target signal bandwidths (400-2000, 800-1600, and 1120-1280 Hz) are presented.<>
Keywords :
antenna phased arrays; parameter estimation; signal processing; 160 Hz; 1600 Hz; 400 to 2000 Hz; 800 Hz; Cramer-Rao bound; Griffiths-Jim adaptive beamformer; angular beamwidth; array processing; broadband antenna arrays; broadband signals; direction of arrival estimation; narrowband signals; signal processing; sinusoidal signal; superresolution effects; target signal bandwidths; Adaptive arrays; Antenna arrays; Broadband antennas; Direction of arrival estimation; Filters; Frequency domain analysis; Frequency estimation; Narrowband; Sensor arrays; Signal resolution;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115390
