GPS-Iridium Anti-Jam (AJ) Antenna Systems for Air Vehicle and Sea Vehicle Platforms Navy SBIR FY2012.2 Sol No.: Navy SBIR FY2012.2 Topic No.: N122-115 Topic Title: GPS-Iridium Anti-Jam (AJ) Antenna Systems for Air Vehicle and Sea Vehicle Platforms Proposal No.: N122-115-0638 Firm: Applied EM Inc. 144 Research Drive Hampton, Virginia 23666 Contact: Phone: (757) 224-2035 Web Site: www.appliedem.com Abstract: Objective of the proposed research effort is to design, build and test an experimental AJ antenna for GPS receiver and Iridium transceiver functionality and to develop novel signal processing techniques without compromising the AJ suppression capability of either of the two systems. The AJ antenna will have at least four elements and will be approximately four inch in diameter. The individual antenna elements will be designed to receive M-coded GPS signals in L1 and L2 band as well as receive and transmit Iridium communication system signals simultaneously. Since the transmitted signal is much stronger than the received signals, the antenna must provide good isolation to enable the simultaneous reception of weak navigation and communication signals and transmission of strong communication signal. In this project, Applied EM along with its team members will develop a new signal processing algorithm for the antenna electronics (AE) such that the signal processing capability of a given receiver (GPS or Iridium) are not compromised by the presence of the other signals. Size, weight and Power (SWAP) will be considered in the development of antenna and antenna electronics so that the same antenna system can be used for airborne as well as undersea vehicles. Benefits: This technology may also be used for navigation on commercial air and sea vehicle systems, e.g. commercial aircraft. For example, because of the proliferation of low-cost GPS jammers, the FAA is becoming more concerned about the loss of GPS or Wide Area Augmentation System (WAAS) signals due to RF interference, such as recently occurred in the Newark airport area. In this case, the antenna design could be modified to include the WAAS signal as broadcast from WAAS satellites deployed at geosynchronous (GEO) orbit. Return