상세정보
학술대회
An LUT-based Adaptive DPLL for SSV GNSS Receivers
- 저자
- 송영진, 이상욱, 원종훈
- 발행일
- 202109
- 출처
- International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+) 2021, pp.3360-3367
- 초록
- Global Navigation Satellite System (GNSS) receivers suffer from low signal power and high dynamic stress when operating in the Space Service Volume (SSV). Therefore, the dedicated design of receivers for challenging environments is needed. In this paper, a Look-Up Table (LUT)-based adaptive Digital Phase Locked Loop (DPLL) is proposed. It continually adjusts the noise bandwidth of the DPLL properly by continuously measuring current C/N0 and jerk dynamic stress. Because it contains the LUT that has several pre-computed noise bandwidth values, an additional calculation process of the appropriate noise bandwidth value is not needed. Therefore, the receivers simply get the proper noise bandwidth value from LUT in a short time for stable operation. Numerical simulations configured using the moon exploration mission trajectory show that the proposed algorithm maintains tracking of the signal parameters successfully even in the harsh environment simulation scenarios such as the low signal power and/or high dynamics regions, while the conventional fixed noise bandwidth method may lose its lock.
- KSP 제안 키워드
- Calculation process, Exploration mission, GNSS receiver, Harsh Environment, Measuring current, Moon exploration, Noise bandwidth, Numerical simulations, Phase locked loop(PLL), Short time, Simulation scenarios