M.Eng. Project Announcement - – 2012-2013
Project title: Antenna Articulation Mechanism for Special-Purpose GPS Receiver
Brief description of project goals:
Overview:
GPS and other Global Navigation Satellite System (GNSS) Position, Navigation, and Timing (PNT) devices rely on the radio wave observables. The integrity of these observables can be degraded by multipath effects or completely destroyed by spoofing. Spoofing is the intentional broadcast of false signals. A promising technology for the detection and mitigation of multipath or spoofing effects is to exploit correlations between small motions of an antenna and changes in the observables of received signals. In order to do this, a GPS receiver needs an antenna articulation subsystem that can produce small, rapid motions and that can measure these motions and report them back to the receiver. Peak-to-peak deflections on the order of 5 cm with frequencies on the order of 8-10 Hz are required, which translates into a peak acceleration of up to 10g's. Sensing requirements are to measure these deflections to an accuracy on the order of 1 mm at a sampling frequency of up to 1000 Hz.
Specific M. Eng. Contribution:
This project involves the design, prototype fabrication, and testing of the requisite antenna articulation and sensing system. The articulation system development will involve acquisition or design & development of a bearing or flexure system and an actuator system. The motion sensing will involve acquisition or design & development of a sensor. Both the actuator and the sensor will need to be interfaced to a data acquisition and control computer or directly to a software radio GPS receiver.
ME/AE
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