ing an ionospheric total electron content radio measurement experiment optimized for nighttime application in the E and lower F regions of the ionosphere. The experiment was based on Faraday rotation, using a ground based HF transmitter, rocket borne receiver, and digital signal processing to extract the desired signals.

Professor Gilchrist has also held both technical and supervisory positions in industry (Watkins-Johnson Company) over a twelve-year period associated with microwave integrated circuit and subsystem design for radar and ecm applications. Research activities included: phased array radar, low-noise amplifiers, phase-shifters, and microwave sample-and-hold circuits.