Dr. Heppe has over 25 years experience in the area of communications engineering with General Electric Space Division, Stanford Telecommunications, Telenergy and the Insitu Group. Dr. Heppe has also served as an independent consultant and expert witness in satellite communications, GPS/cellular and radio technologies, CATV user interfaces, cell networks, GSM and Voice over IP (VoIP). He has developed aircraft avionics, including data radios, GPS navigation, satellite communications, video processing, RF transmission and sensors and flight control, as well as VHF radio communications protocol for aircraft networking, spectrum engineering for satellite communications (Globalstar), mobile satellite systems and various space based Government systems including Defense Satellite Communications System (DSCS), the Strategic Defense System (SDS), spaced based radar (SBR), Milstar, NASA Tracking and Data Relay Satellite system (TDRSS), various naval satellite systems and the network for the US Air Force Consolidated Space Operations Center (CSOC). Dr. Heppe is familiar with GPS position and velocity determination for aircraft, spacecraft and ground vehicles, differential GPS and automatic dependent surveillance (ADS), navigation accuracy determination, flight testing hardware and software and protocol development and signal processing. Dr. Heppe has testified in numerous patent cases and in an ITC matter. He has published several articles and holds 2 US patents in the aforementioned technologies. He received a BSEE degree (Computer Science emphasis) from Princeton University in 1977 and his MS and Ph. D. degree in Electrical Engineering (Communications emphasis) from George Washington University in 1982 and 1989, respectively.