Bisnath, Sunil B.Yang, Sihan2020-11-132020-11-132020-092020-11-13http://hdl.handle.net/10315/37980The Precise Point Positioning (PPP) measurement processing technique for Global Navigation Satellite Systems (GNSS) is applied widely for scientific applications that require sub-metre level accuracy with few obstructions. PPP is expanding into mass-market applications at the consumer level. However, the technique suffers from inherent disadvantages of GNSS-based technologies. Obstructed environments such as urban canyons downgrade the solution. The study presents a solution that requires one less satellites in such scenarios and improves the navigation solution given poor geometry by implementing a clock coasting method to PPP and using a GNSS receiver aided by an external chip-scale atomic clock (CSAC). Data were collected in both static and kinematic scenarios. Through simulation of signal obstructions, the CSAC-aided receiver with clock-coasting produced solutions at sub-metre level of accuracy, even if only 3 satellites were available. The study leads to a more robust GNSS navigation solution that performs better with fewer satellites and a poor geometryAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.EngineeringElectronic Thesis or Dissertation2020-11-13GNSSCSACAtomic clockUrban obstructionAutonomous intelligent car