Precise Point Positioning: Multi-Constellation Ionospheric-Free Positioning Using L1/L5 Frequencies on a Low-Cost Receiver
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Systems, control and mechatronics (MPSYS), MSc
Publicerad
2024
Författare
Melander, Marielle
Pettersson, Philip
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
This thesis revolves around the area of satellite-based positioning using Global Navigation Satellite System (GNSS) signals from the Global Positioning System (GPS) and
Galileo constellations. GNSS positioning plays a vital role in daily life, particularly in
applications like navigation and timing. This project aims to develop a high-accuracy,
Precise Point Positioning (PPP) solution using data from a low-cost receiver. To achieve
this an ionosphere-free measurement combination based on L1 and L5 frequencies is ex plored instead of the conventional choice of L1 and L2. The research investigates the
impact of different error sources, such as biases and atmospheric disturbances, on the
accuracy of PPP. An Extended Kalman Filter (EKF)-based solution that incorporates
offline corrections, cycle slip detection, and ambiguity resolution is proposed. The hardware used for data collection is the u-blox evaluation kit EKV-F9P which includes the
GNSS receiver module ZED-F9P and an antenna. This low-cost dual-frequency hardware
is proven to provide accurate data to implement a high-accuracy PPP solution. When
enough satellites are visible, the results demonstrate a decimetre-level accuracy for sta tionary positioning estimation. However, due to the limited availability of L5 frequency
signals, continuous precise positioning is not always possible. Despite this limitation, the
work contributes to advancing GNSS positioning technology and lays the groundwork for
future enhancements in PPP-based applications.
Beskrivning
Ämne/nyckelord
PPP , GNSS , EKF , dual-frequency , Ionosphere-free , low-cost , EVK-F9P , u-blox