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GPS Antenna and Receiver for Small Cylindrical Platforms
Svendsen, Andrew S. C.

2012, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
In the past few decades, GPS has revolutionized navigation positioning and timing with numerous civilian and military applications. Recently, there is increased interest in GPS navigation for small cylindrical platforms which can have a potentially high rotation rate (up to 350 Hz). The purpose of this work is to extend the state-of-the-art of GPS receiver and antenna technology for this specific application of small cylindrical platforms. This presents a set of design challenges for engineers, and this work will make contributions to three aspects of the problem: antenna design, satellite coverage, and receiver design. First, a novel dual-band antenna that provides right-hand circular polarization (RHCP) coverage at the GPS L1/L2 bands for reception of C/A-, P(Y)-, and M-coded GPS signals is designed. The availability of GPS measurements at two bands allows one to remove the biases due to the ionsphere and reception of P(Y) and M-coded signals improves navigation accuracy. Importantly, the antenna size is only 4cm × 4cm × 5.08mm (λ/6 × λ/6 × λ/50). Second, this antenna is specifically designed to have a robust tuning such that it can be mounted on metal cylinders of various diameters (60-160mm) and still function properly. For these cylinders, the antenna has broad RHCP coverage and good gain bandwidth performance. Third, the satellite coverage provided by the antenna is investigated. As expected, a single element cannot provide the full spherical coverage which is needed for continuous satellite tracking as the platform rotates. It is shown that the maximum gain method (i.e. choosing the element with the highest gain) is able to obtain full spherical coverage even with only two elements. However, it is a challenge to implement this method because the time-varying platform attitude is unknown. Therefore, a novel receiver tracking algorithm that implements the maximum gain method is designed by modifying the receiver itself, specifically the delay lock loop. Example results shown that the proposed approach is able to provide continuous satellite tracking as the platform rotates, minimize the number of elements, and eliminate the need for knowledge of the platform attitude.
Inder Gupta, PhD (Advisor)
Chi-Chih Chen, PhD (Committee Member)
Joel Johnson, PhD (Committee Member)
Hesham El-Gamal, PhD (Committee Member)
217 p.

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Svendsen, A. (2012). GPS Antenna and Receiver for Small Cylindrical Platforms. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Svendsen, Andrew. "GPS Antenna and Receiver for Small Cylindrical Platforms." Electronic Thesis or Dissertation. Ohio State University, 2012. OhioLINK Electronic Theses and Dissertations Center. 25 Sep 2017.

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Svendsen, Andrew "GPS Antenna and Receiver for Small Cylindrical Platforms." Electronic Thesis or Dissertation. Ohio State University, 2012. https://etd.ohiolink.edu/

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