Dr. Brian Sequeira of The Johns Hopkins University Applied Physics Laboratory

Previous generations of direction of arrival monopulse architectures employ rectangular arrays whose quad outputs are processed in the microwave domain to generate three signals from which 2-D angle information is derived. Historically, such architectures are null-seeking, which carries the inherent disadvantage that, the better the alignment of line-of-sight of the signal source to monopulse boresight, the worse is the signal-to-noise ratio (SNR) in the corresponding receiver channels and hence the poorer the estimate of angle error. Increasing use of digitally-generated signals in radar and communication systems offers the opportunity to utilize non-nulling architectures to estimate angle error and employ three non-collinear feeds arranged to estimate direction of arrival. Such triangular architectures provide smaller variations in SNR than their null-seeking counterparts, offer superior calibration strategies, and in some cases, simpler alignment of feed hardware.

Biography:

Brian Sequeira is Principal Professional Staff in the RF Engineering Group at JHU/APL where he is a Lead Radar Engineer.   He received his Ph.D. in Electrical Engineering at the University of Delaware. He is a member of the NASA Standing Review Board, on the joint NASA-Indian Space Research Organization SAR(Synthetic Aperture Radar) mission and He is also a Member of the NASA Instrument Review Board, for RIME (Radar for Icy Moon Exploration), which is on the JUICE (Jupiter Icy moons Explorer) mission.

Address:National Electronics Museum, , United States

Dr. Brian Sequeira of The Johns Hopkins University Applied Physics Laboratory

Biography:

Address:United States