Work

Impact of flex power on inter- and intra- differential code bias variation

Year: 2025

Type: article

Abstract: Differential Code Bias (DCB) is the time delays between two different GNSS signals, which is crucial for GNSS positioning. Previous studies have shown that it can be significantly affected by the flex power operations in satellites. This study proposes a 15-min short-term DCB estimation method to analyze flex power's impact on DCB variations. The method jointly estimates satellite DCB, receiver DCB, and ionospheric parameters using over 300 MGEX stations. We examined three representative flex power events in 2024, achieving average internal RMS values of 0.042 ns and 0.0068 ns for inter-frequency and intra-frequency scenarios respectively. Results show that intra-frequency DCB exhibits clear shift biases synchronized with flex power state transitions while maintaining stability within 0.20 ns during non-transition periods. No definitive impact on inter-frequency DCB was observed at current estimation precision levels.

Source: Geodesy and Geodynamics

DOI: 10.1016/j.geog.2025.09.005

Authors: Jiayu Li, Yan Xiang, Chengeng Su, Xiaolin Jia

Institution: Shanghai Jiao Tong University

Language: English

Topic: GNSS positioning and interference

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funder: National Natural Science Foundation of China

Awards: G3411179352, G5607986989, G7065817770