Digital wideband phased array calibration and beamforming using time reversal technique

Author

Liou, Lee L. ; Lin, David M. ; Longbrake, Matt ; Buxa, Peter ; McCann, John ; Dalrymple, Tom ; Tsui, James B. ; Qiu, Robert ; Hu, Zhen ; Guo, Nan

Author_Institution

RYDR, AFRL, Wright-Patterson AFB, OH, USA

fYear

2010

fDate

12-15 Oct. 2010

Firstpage

261

Lastpage

266

Abstract

A 16-channel digital wideband phased array without antenna is characterized using impulse response measurement. A chirp signal is used as probing signal. By careful chirp design, impulse response at sub-band is measured for all the channels. Spectral domain response showing dispersive phase and magnitude reveals significant imbalance among the channels. Based on time reversal technique principle, spectrum-modified time reversal impulse response is calculated. This time reversal response is applied to the chirp probing signal to verify the bandpass characteristics of the sub-band, and the waveform coherent waveform. It is also applied to the CW pilot tone to verify digital beamforming gain.

Keywords

array signal processing; receivers; transient response; bandpass characteristics; chirp probing signal; digital beamforming gain; digital wideband phased array calibration; impulse response measurement; multichannel wideband digital receiver; spectral domain response; spectrum-modified time reversal impulse response; time reversal technique; waveform coherent waveform; Array signal processing; Arrays; Chirp; Gain; Radio frequency; Time series analysis; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Phased Array Systems and Technology (ARRAY), 2010 IEEE International Symposium on

Conference_Location

Waltham, MA

Print_ISBN

978-1-4244-5127-2

Electronic_ISBN

978-1-4244-5128-9

Type

conf

DOI

10.1109/ARRAY.2010.5613359

Filename

5613359