By S. Uṇṇikrishṇa Pillai, C. S. Burrus (auth.), S. Uṇṇikrishṇa Pillai, C. S. Burrus (eds.)

This publication is meant as an creation to array sign procedure ing, the place the imperative targets are to use the to be had a number of sensor info in a good demeanour to become aware of and possi bly estimate the indications and their parameters found in the scene. the benefits of utilizing an array rather than a unmarried receiver have prolonged its applicability into many fields together with radar, sonar, com munications, astronomy, seismology and ultrasonics. the first emphasis this is to target the detection challenge and the estimation challenge from a sign processing point of view. many of the contents are derived from on hand resources within the literature, even if a cer tain volume of unique fabric has been incorporated. This booklet can be utilized either as a graduate textbook and as a reference booklet for engineers and researchers. the fabric provided right here might be with no trouble understood through readers having a again floor in easy likelihood concept and stochastic strategies. A prelim inary path in detection and estimation concept, notwithstanding now not crucial, could make the studying effortless. actually this ebook can be utilized in a one semester direction following likelihood thought and stochastic processes.

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**Additional resources for Array Signal Processing**

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Since the Vandermonde structured matrix Vt is of full row rank L, the dimension of N (vt) is K - L. Let vL +l' VL F' • •• , VK be a set of linearly independent basis vectors for N (V). With respect to the basis vectors for the K -dimensional space, these K x 1 null space basis vectors can always be selected such that [35], VI = [v 1/' V 2/' •.. , vu' 0, ... , 0, 1, 0, ... , 0] T . 136) the 1 is at the Zth location. ) These vI' Z = L + 1, L +2, · . " K are linearly independent and, moreover, for any j E { L + 1, L + 2, ...

It is easily verified that b = II b II PI with II b II 2 = tr (R1). 69) can be obtained from this vector by employing a special case of the technique discussed in the next section. It may be pointed out that in the above discussion all sources are assumed to be completely coherent with each other. Next, we deal with the most general source situation: a correlated source environment consisting of coherent as well as partially correlated signals in presence of noise. 2 Symmetric Array Scheme: Coherent Sources in a Correlated Scene In this case the source scene consists of K +1 narrowband signals u 1(t), u 2(t), ...

R*(I)a 1 . • ,a T I] . 34) H (z) = 1 + [ z -(M-I), z -(M-2), ... ··,ej w] T Thus t -1 ( ) r 0 - '"IM-I,I T M -2 '"1M-I,I t -1 2 . 46) This expression will turn out to be useful in analyzing the statistical properties of the linear predictor, when data samples are used in estimating the unknown covariances. 3 Eigenvector-Based Techniques Consider a linear array consisting of M identical sensors and receiving signals from K narrowband signals uI(t), uit), ... •. , OK with respect to the line of array (Fig.