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Title: Location finding using cellular networks
Author: Whitlock, Roderick
ISNI:       0000 0004 2743 8336
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 2013
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The motivation for the research was primarily to satisfy positional accuracy requirements for mobile phone handsets using terrestrial networks as specified by the United States (US) Federal Communications Commission (FCC) E-911 rules. The objective of the research was to improve location finding accuracy to support the emergency services and the stolen vehicle recovery service, in areas devoid of satellite coverage. Following a literature review, four novel location finding techniques were discovered and simulated. The first novel technique provides a means to achieve an accurate mobile time source (1 part in 107) in first generation cellular networks and thereby accurate positioning (< 100m). The second novel technique achieves improved base station timing accuracy (1 part in 10⁷) using the Network Time Protocol (NTP) over GPRS. The third novel technique was found to enhance the accuracy and resolution (< 100 m) of Timing Advance (TA) in second generation networks. The fourth novel technique takes the form of a receiver architecture capable of high resolution (0.1°), multipath, Direction of Arrival (DOA) determination within a third generation network. Localisation using triangulation is achievable to < 100 m for practical 3G cell sizes. DOA accuracy in a 10 UE environment is approximately 1°, increasing to 2.5° in a 40 UE environment. Additionally, two novel methods of improving radio signal detection range were discovered and simulated. These enable location finding to be achieved within cellular networks where maximum communication range alone is insufficient for DOA triangulation purposes. The first method takes the form of a novel high gain (> 20 dBi) pseudo-Doppler antenna. The second method provides enhanced processing gain using a novel Error Correction Coding (ECC) post processing algorithm for hard decision decoded messages where signal re-transmission exists or can be requested. The results of the study revealed that improvements in location finding accuracy are possible in 1st, 2nd and 3rd generation cellular radio networks without compromising the operation of legacy handsets or stolen vehicle tracking devices.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available