Vector Sensor Array-based Broadband Constant Beamwidth Beamforming

As the development of array signal processing, it faces to new requirement and challenge because of the atrocious and varing environment. Vector sensors array enhances the capability of array processing comparing with normal array. Base on this reason, this paper introduces the use of vector sensors array. It was used widely in acoustic and radar communication. Still introduces the receiving array mathematic model for vector sensors array. Beam forming is very important application field in array signal processing. It makes use of spatial filter technology which receives different azimuths and compresses the interference and noise and tones up the desired signal using them. In the early of the array signal processing, the emphasis is on the narrow signal processing, but as the abroad use, it relates to the wideband signal such as earthquake, linguistic and sonar. Since these signals embrace the abundant information for target, broadband signal is paid attention. For wideband signal, the frequencies are in a range which is distinguished from narrow signal that is fixed frequency. Consequently, the output signal will be distorted if it is not be restricted. We can adopt two ways as the constrained method. One way is to form an invariant bandwidth beam forming, and the other is frequency-invariant beam forming. In this paper, we emphasize on the former. On the other hand, as adaptive technology is widely used, it becomes the trend of beam forming of array processing. It can adjust the parameters to adapt the varing environment to location according to the azimuth information. In recently, it is mainly produced in time-domain wideband beam forming, while it rarely be introduced to the invariant bandwidth. Base on this reason, this paper proposes the method of adapting and deduces the adaptive algorithm.