[1] Harry L, Van Trees. Optimum Array Processing[M]. New York: Wiley,2002: 2-9.

[2] Ma M T. Theory and applications of antenna arrays[M].New York: Wiley, 1974: 73-177.

[3] Brandstein M, Ward D. Microphone Arrays: Signal processing techniques and applications[M]. Berlin: Springer, 2001: 3-17.

[4] 鄢社锋,马远良.传感器阵列波束优化设计及应用[M].北 京:科学出版社,2009: 163-193.

[5] Ward D B, Kennedy R A, Williamson R C. FIR filter design for frequency invariant beamformers[J]. IEEE Signal Processing Letters, 1996,3(3): 69-71.

[6] Ward D B, Kennedy R A, Williamson R C. Theory and design of broadband sensor arrays with frenquency invariant far-field beam patterns [J]. J Acoust. Soc. Amer, 1995, 97 (2): 1023-1034.

[7] Ning Xie, Hui Wang, Hongwei Liu. Broadband Frequency Invariant Beamformer [C]// Wireless Pers Commun. LLC: Springer Science & Business Media, 2010: 107-114.

[8] Do Hong T, Russer P. Signal processing for wideband smart antenna array applications[J]. IEEE microwave magazine, 2004,72(9):57-67.

[9] Arfken G B, H J Weber. Mathematical Methods for Physi-cists[M]. 4th ed. Amsterdam, the Netherlands: ELSEVIER ACADEMIC Press, 2005: 366-369.

[10] Parks T W, Burrus C S. Digital filter design[M]. New York: Wiley, 1987: 983-995.

[11] Wei Liu, Stephan Weiss. Frequency invariant beamforming for two-dimensional and three-dimensional arrays[J]. Signal Processing, 2007, 87(11): 2535-2543.

[12] Wei L, Weiss S. Design of frequency invariant beamform-ers for broadband arrays[J]. IEEE Transactions on Signal Processing, 2008, 56(2): 855-860.

[13] Wei Liu, Stephan Weiss. A new Class of Broadband Arrays with Frequency Invariant Beam Patterns[J]. IEEE Transactions on Signal Processing, 2004, 50(1):185-188.

[14] Pillai S U. Array Signal Processing[M]. New York: Springer, 1993: 254-267.

[15] Yunhong L, Ho K C. Kwan C. Array pattern synthesis with frequency invariant property for concentric ring array[J]. IEEE Transactions on Signal Processing, 2006，54 (2): 780-784.

[16] Chan S C, Chen H H. Uniform concentric circular arrays with frequency - invariant characteristics-Theory, design, adaptive beamforming and DOA estimation[J]. IEEE Transactions on Signal Processing, 2007,55( 1) ： 165-177.

[17] Chen H H, Chan S C, Ho K L. Adaptive beamforming using frequency invariant uniform concentric circular arrays[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2007，54(2): 1938-949.

[18] Chen H H, Chan S C. Theory and design of uniform concentric circular arrays with frequency invariant characteristics[C]// in Proc. IEEE ICASSP, 2005: 805-808.

[19] Abhayapala T D, Bhatta H. Coherent Broadband Source Localization by Modal Space Processing [C]/ / IEEE.10th International Conference on Telecommunications,23 Feb- 1 March, 2003: 1617-1623.

[20] Wang B H, Guo Y, Wang Y L, et al. Frequency-invariant pattern synthesi of conformal array antenna with low cross-polarisation[J]. Microwaves, Antennas & Propagation, IET, 2008, 2: 442-450.