Biography
Enrollment Date: 2011
Graduation Date：2014
Degree：M.S.
Defense Date：2014.05.26
Advisors：Zhihua Wang
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Implemention of GNSS Attitude Determination Receiver Using Homologous RF Platform
Abstract:
Global Navigation Satellite System appeared, especially GPS built and put into use in the field of navigation guidance technology caused a profound impact. GNSS system can not only achieve positioning, speed and provide time information on a global scale, can actually use of interfere carrier phase measurement to achieve attitude determination. Currently, most of the GNSS attitude determination system built by independent receiver board, it is the use of multiple GNSS OEM board measuring carrier phase observations, and then implement differential carrier algorithm achiver the attitude determination. This method is separation time and movement correlation between the receiver, the concept of signal processing algorithms and measurement quality control is relatively complicated. Based on this situation, the main contents in this paper are as follows:
First, in this paper a specialized GNSS attitude determination receiver is implemented using homologous RF platform, the receiver uses identical RF circuits which are driven by the same one crystal oscillator, so it has a better correlation between different signal paths. Receiver baseband signal processing is divided into Master RF signal path and Slaver RF signal path. The Master RF signal path completes acquisition and tracking task and the Slaver RF signal path deals with measurements extraction.
Then, this paper analyzes the impact of the main differences between homologous RF platform with traditional platform is the local oscillator. Homologous platform can directly extracted differential phase observations, lower dynamic stress model noise, without half cycle carrier phase, observations compensated with a constant value have single difference integer ambiguity characteristics. Lower dynamic stress model noise helps improve attitude accuracy; observables without half cycle carrier phase helps improve the model in harsh environments; single difference integer ambiguity features help to enhance environmental adaptability.
Finally, this paper designe a baseline based vector Kalman filter algorithm, complete the measurement process to the attitude determination filter. Static and dynamic car experiments validate the homologous platform GNSS receiver has a stronger attitude determination environmental adaptability and higher attitude measurement accuracy.