Abstract
A frequency invariant response algorithm is proposed for getting over the signal distortion in high frequency when the beamformer receives the broadband signals. In this method, the weight vector of the reference beam pattern is designed firstly, then the weight vectors when the beam response in the frequency sub-bands approaching the reference response mostly are computed by optimized method or adaptive method. By this method, the beam pattern in each sub-band can be almost kept invariable. As a result, the receiving chirp signal can be improved. Owing to the adoption of the adaptive method to approach the optimized vectors, it has no restricting of the array format and the element directivity, and the method can be used widely.
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Foundation item: Supported by the 863 Foundation under Grant No.2002AA602230.
GUO Yuan-xi was born in 1980. She is working towards her Ph.D in Harbin Engineering University in China. Her current research interests include signal and information processing.
WANG Ji-sheng was born in 1977. He is working towards his Ph.D. in Harbin Engineering University in China. His current research interests include signal and information processing.
SANG En-fang was born in 1940. He is a professor and the supervisor of Ph.D. of Harbin Engineering University. His current research interests include acoustic imaging and communication signal processing.
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Guo, Yx., Wang, Js. & Sang, Ef. The receiving of chirp signals with frequency invariant beam response. J Mar. Sc. Appl. 5, 54–57 (2006). https://doi.org/10.1007/s11804-006-6013-1
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DOI: https://doi.org/10.1007/s11804-006-6013-1