Title :
Spatial Resolutions of the Broadband Nonredundant and Minimum Redundancy Arrays
Author :
Duan, Huiping ; Ng, Boon Poh ; See, Chong Meng Samson ; Fang, Jun
Author_Institution :
Nanyang Technol. Univ., Singapore
Abstract :
Approximate formulations for the 3-dB beamwidth are derived in this letter to measure the spatial resolution of the broadband nonredundant array (NRA) and minimum redundancy array (MRA), which assume the ideal continuous-time, infinite-length filters with the frequency responses obtained by the linearly constrained minimum variance (LCMV) optimization. By these formulations, the beamwidths of NRA and MRA are compared with that of the uniform linear array (ULA). Moreover, the accuracy of the derived formulations is assessed by numerical studies.
Keywords :
array signal processing; continuous time filters; filtering theory; optimisation; signal resolution; broadband nonredundant array; continuous-time infinite-length filters; linearly constrained minimum variance optimization; minimum redundancy arrays; spatial resolutions; Adaptive arrays; Constraint optimization; Filters; Frequency measurement; Geometry; Narrowband; Sensor arrays; Signal resolution; Spatial resolution; Speech; Broadband array; adaptive beamformer; minimum redundancy array (MRA); nonredundant array (NRA); spatial resolution; uniform linear array (ULA);
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2007.899335
