Title page for etd-0811109-163540


[Back to Results | New Search]

URN etd-0811109-163540
Author Jia-Pu Jang
Author's Email Address No Public.
Statistics This thesis had been viewed 5574 times. Download 1226 times.
Department IAMPUT
Year 2008
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Positioning of Seafloor Transponders Using
GPS and Acoustic Measurements
Date of Defense 2009-07-23
Page Count 70
Keyword
  • lander
  • GPS
  • Ray tracing
  • Transceiver
  • Transponder
  • seafloor
  • deformation
  • Abstract Observing seafloor crustal deformation is often composed of acoustic ranging and GPS positioning techniques, which involves positioning of a single seabed transponder. Generally, the positional uncertainty of the seabed transponder is evaluated in terms of the slant range residuals. In order to further verify the relative positioning accuracy between seabed transponders, this study designed and fabricated a transponder lander. Three transponders were mounted on the lander to form a triangle with sides 1.505, 1.505 and 1.160 m. In addition, a data acquisition and logging system is developed to collect the lander’s attitude, including pitch, roll, heading, and accelerations in three orthogonal axes. A field experiment to verify the relative positioning accuracy between seabed transponders was carried out off the coast of Kaohsiung Harbor, Taiwan. The transponder lander was deployed on the seabed at a water depth of about 300 m. Based on the attitude data collected by the logging system, the heading, pitch and roll of the transponder lander on the seabed are 123.5 degrees, 0.63 degrees and 0.62 degrees, respectively. A vessel was sailed along predetermined paths to collect observations of GPS and acoustic slant range. Then, an optimization technique combined with ray tracing method was used to estimate the positions of three transponders. The position estimates of the three transponders form a triangle with sides 1.533, 1.518 and 1.184 m, which shows that, comparing with the true values, the relative positioning error between transponders is less than 3 cm. Furthermore, based on the estimates of the transponder positions, the heading, pitch and roll of the transponder lander are calculated as 120.45 degrees, 6.43 degrees and 2.51 degrees, respectively, which are in good agreement with that measured by the attitude logging system. The experimental and evaluation results indicate that the optimization technique along with the ray tracing method is practical for precisely estimating the transponder position.
    Advisory Committee
  • Shiahn-Wern Shyue - chair
  • Chau-Chang Wang - co-chair
  • Hsin-Hung Chen - advisor
  • Files
  • etd-0811109-163540.pdf
  • indicate accessible in a year
    Date of Submission 2009-08-11

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys