Title page for ETD etd-12112007-154542


Type of Document Master's Thesis
Author AL-Saleh, Mohammad
Author's Email Address alsaleh@vt.edu
URN etd-12112007-154542
Title Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Zaghloul, Amir I. Committee Chair
DaSilva, Luiz A. Committee Member
Midkiff, Scott F. Committee Member
Keywords
  • Circular Microstrip Patch Arrays
  • LEO Satellite
  • DSSS
  • MEMS
  • Miniature Sensor
Date of Defense 2007-11-29
Availability unrestricted
Abstract
This thesis investigates the design and the performance of low-power microsensors that communicate directly to a satellite or a constellation of satellites. Information is spread using pseudo noise (PN) or Barker codes. The sensors use a single circular microstrip patch element with a wide beamwidth or a miniature phased array antenna that continuously scans to access the satellite(s). The array beam is controlled with a beam-forming network (BFN), which contains 3 or 4-bit phase shifters, which can be made in micro-electro-mechanical systems (MEMS) or in monolithic microwave integrated circuits (MMIC). The antennas are designed using array simulation program called ‘ARRAY’ and the results are used in another simulation program called Advanced Design System (ADS) to simulate the whole sensor package that uses one of the antennas. The simulation results show that a sensor as small as 2.35 cm in diameter is able to send information with data rate of 1 kbps at bit error rate less than 10-5 to low-earth orbit (LEO) satellites with a transmitted power of 27.5 microwatts (-15.6 dBm).
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