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Focus on the sound source using the frequency estimation method for DOA

In Electronic Infomation Category: F | on April 23,2011

Abstract: Focusing is to focus on broadband signal to a certain frequency to determine the approximate narrowband signals. * Array, the relative frequency of received sound signals larger, reaching 3 to 4 orders of magnitude, how to select the focusing frequency estimation algorithm has become a key issue. In response to the multiple signal classification (Multiple Signal CharacteriSTic, MUSIC) algorithm against the element spacing requirements, to prevent multi-valued fuzzy. Focusing algorithm based on the idea of ??broadband, narrowband signal from the focus after the start of the array element spacing of the MUSIC algorithm. Verify the actual array elements of a space by focusing frequency selection method, the simulation shows the feasibility of the method.

Wang and AD8072JR datasheet and Kaveh, who by the proposed coherent signal subspace method (CSM) is a wideband direction of arrival estimation of coherent signals commonly used method. Coherent signal subspace method the main difficulty is to find a focusing matrix, the matrix can be put on each frequency band signal subspace focusing to a certain reference frequency.

Focusing matrix is ??constructed using the CSM, there is the question of frequency pre-focusing. Especially for the sound signal based on * the array DOA estimation, the relative frequency signal range of up to 3 to 4 orders of magnitude, more focus should be concerned about the frequency of choice. [2] to select the center frequency of broadband frequencies as the focus, the literature [3] is to make focused by the choice of the minimum error of fitting the center frequency broadband signals 1.1 times the frequency as the focus. But no matter which method is to focus and AD8072JR price and follow-up of broadband location algorithm considered separately, so the choice of the interval for the array element is very limited, and AD8072JR suppliers and the frequency range of wideband signals has not been fully utilized.

1 * Array Receiver Model

Consider M a * array that contains the space P there is a sound source signal (M> P), respectively, the direction angle 1, 2, ...??, P, i-a * of the received signal can be expressed as:


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