Title :
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
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;
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
DOI :
10.1109/ARRAY.2010.5613359
