2015 Weems Award

Presented to: Dr. Inder J. Gupta

Citation: For pioneering theoretical and experimental work on anti-jam antennas and signal processing techniques for interference suppression in GNSS receivers.

Dr. Inder J. Gupta is a world-renowned authority on anti-jam antennas and signal processing techniques for interference suppression in GNSS receivers. He has conducted pioneering theoretical and experimental work that enabled the implementation of these techniques in real world systems. At the request of the GPS Joint Program Office (now GPS Directorate), he carried out an analysis of the various interference suppression techniques in GPS receivers (1990’s). He demonstrated that for the expected jamming threats, only joint Space-Time Adaptive Processing (STAP) or joint Space-Frequency Adaptive Processing (SFAP) can provide the desired protection to a GPS receiver. This work was the foundation of Advanced Digital Antenna Production (ADAP) program, under which US Navy upgraded its AJ (Anti-Jam) antennas for various platforms.

Dr. Gupta developed the first analytical model to predict the performance of SFAP-based anti-jam antennas (early 2000’s). This model demonstrated that SFAP could provide equal interference suppression to STAP. Dr. Gupta has also contributed to reducing the size of anti-jam antennas for GNSS receivers. These antennas are designed for wideband operation (1150 MHz to 1600 MHz) and thus can be used to receive signals from all GNSS satellites.

Dr. Gupta co-developed the first STAP algorithm that simultaneously provides good AJ properties and reduces antennainduced biases in GNSS measurements. For the existing AJ antennas, he found efficient approaches for on-the-fly-estimation of antenna-induced biases that have been verified experimentally.

Dr. Gupta was instrumental in the success of Small Antenna System (SAS) program managed by SPAWAR, where he identified the interference suppression deficiencies of the available antenna electronics for GPS receivers mounted on rotorcrafts, and developed innovative approaches to model rotorcraft modulation in hardwarein- the-loop testing.

Dr. Gupta received his Ph.D. in Electrical Engineering from The Ohio State University. He has published over 50 peer reviewed journal papers, has won numerous awards, and is a recognized international lecturer. He is a Fellow of ION as well as IEEE.