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Improvements in GPS precision: 10 Hz...

University of Colorado at Boulder.

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Improvements in GPS precision: 10 Hz to one day.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Improvements in GPS precision: 10 Hz to one day./
作者:	Choi, Kyuhong.
面頁冊數:	255 p.
附註:	Adviser: Kristine M. Larson.
Contained By:	Dissertation Abstracts International68-03B.
標題:	Engineering, Aerospace. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3256427

Improvements in GPS precision: 10 Hz to one day.
Choi, Kyuhong.

Improvements in GPS precision: 10 Hz to one day. - 255 p.

Adviser: Kristine M. Larson.

Thesis (Ph.D.)--University of Colorado at Boulder, 2007.

Each research project assesses the methods to reduce the noises and/or biases in various time intervals. Each method considered in this dissertation will fulfill the needs for scientific applications.Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Improvements in GPS precision: 10 Hz to one day.
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520 $a Each research project assesses the methods to reduce the noises and/or biases in various time intervals. Each method considered in this dissertation will fulfill the needs for scientific applications.
520 $a Seeking to understand Global Positioning System (GPS) measurements and the positioning solutions in various time intervals, this dissertation improves the consistency of pseudorange measurements from different receiver types, processes 30 s interval data with optimized filtering techniques, and analyzes very-high-rate data with short arc lengths and baseline noise.
520 $a The first project studies satellite-dependent biases between C/A and P1 codes. Calibrating these biases reduces the inconsistency of satellite clocks, improving the ambiguity resolution which allows for higher position precision. Receiver-dependent biases for two receivers are compared with the bias products of Center for Orbit Determination in Europe (CODE). Baseline lengths ranging up to &sim;2,100km are tested with the receiver-specific biases; they resolve more phase ambiguity by 4.3% than using CODE's products.
520 $a The second project analyzes 1 s and 30 s interval GPS data of the 2003 Tokachi-Oki earthquake. For 1 Hz positioning, Iterative Tropospheric Estimation (ITE) method improves vertical precision. While equalized sidereal filtering reduces noise for multipath-dominant 30--300 s periods, it can cause long-term drifts in the timeseries. A study of postseismic deformation after the Tokachi-Oki earthquake uses 30 s interval position estimations to test multiple filtering strategies to maximize precision using lower-rate data. On top of the residual stacking, estimation of a random walk constraint of sigmaDelta = 1.80 cm/ hr shows maximum noise reduction capability while retaining the real deformation signal. These techniques enhance our grasp of fault response in the aftermath of great earthquakes.
520 $a The third project probes noise floor characteristics of very-high-rate (> 1 Hz) GPS data. A hybrid method, designed and tested to resolve phase biases, minimizes computational burdens while keeping the quality of ambiguity-fixed solutions. Noise characteristics are compared after an analysis of 5 and 10 Hz Ashtech MicroZ and ZFX as well as Trimble NetRS receivers. The Trimble NetRS receiver noise has a timeseries standard deviation double that of Ashtech MicroZ receivers. Also, the power spectral density function has a 0.1 Hz peak. Noise power shows white noise for the frequency range from 2 Hz and higher.
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791 $a Ph.D.
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