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Session 1547

USING LOW COST GLOBAL POSITIONING SYSTEM (GPS) RECEIVERS TO TEACH INTERFACING

John D. Cremin Parks College of Engineering and Aviation Saint Louis University

ABSTRACT

One of the objectives of the junior and senior courses in Avionics at Parks College is to provide the students with practical design experience. One recent approach to this objective uses low cost (under $500) marine GPS Receivers, a digital storage scope, a laptop computer, and some simple circuitry. One of the main objectives of the series of the design exercises and associated lab experiments is to provide experience in designing with serial data bus interfaces such as: The National Marine Electronics Association (NMEA) 1803, commonly used with GPS and other marine navigation systems, The RS232 standard commonly used with PC Com ports and The Aeronautical Radio INC (ARINC) 429 serial avionics data bus. This paper presents and interprets some of the waveforms captured by a digital storage scope for a series of interfacing experiments. The experiments, spread over junior and senior courses in Avionics, utilize the PC COM port to acquire data from various equipment..

INTRODUCING INTERFACE DESIGN The following characteristics are judged to be desirable characteristics for design problems and associated lab experiments: are within the capabilities of the students and their available time, have sufficient interest to challenge the student's creativity, are inexpensive and, utilize equipment and instrumentation which is readily available, The design experiments which will be described in this paper using inexpensive hand held GPS receivers satisfied all of the above criteria. The overall goal of the series of experiments is to characterize GPS and integrate a GPS receiver into an avionics system. The experiments which are now part of the Avionics II Lab, were broken down into the following steps to achieve this goal: Characterize the two available hand held units in terms of finding locations and navigating to them, Characterize the GPS environment (satellite locations and signal strength) Characterize the interfaces of each of the receivers,

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Cremin, J. D. (1998, June), Using Low Cost Global Positioning System (Gps) Receivers To Teach Interfacing Paper presented at 1998 Annual Conference, Seattle, Washington. 10.18260/1-2--7511