Phase-Time Method: Accurate Doppler Measurement for Iridium NEXT Signals
- 所属单位：北京航空航天大学
- 发表刊物：IEEE Transactions on Aerospace and Electronic Systems
- 摘要：Opportunistic positioning utilizing low Earth orbit satellite (LEO)
signals mostly adopts Doppler positioning, the performance of which largely depends on the accuracy of Doppler measurement at the receiver. Traditional Doppler measurement methods for Iridium NEXT signals are limited and mostly implemented in frequency domain, which cannot avoid the limitation of fast Fourier transform operation.Aiming at this problem, this article proposes a method achieving accurate Doppler measurement of Iridium NEXT signal in time domain, namely phase-time method. This method achieves accurate Doppler measurement by measuring the change rate of the signal phase over time. Experiments were implemented using real Iridium NEXT signals, and the results have demonstrated that compared with the existing method, the Doppler measurement value obtained by the
phase-time method possesses higher accuracy. Taking the Doppler measurement values obtained by the phase-time method as observations, the stability and reliability of Doppler positioning can be significantly improved. The proposed phase-time method is of great significance to LEO-signal frequency estimation in time domain, and further contributes to opportunistic positioning using LEO constellations.
- 论文类型：期刊论文
- 一级学科：信息与通信工程
- 文献类型：期刊
- 是否译文：否
- 收录刊物：SCI
附件：
2022-TAES Phase-Time Method Accurate Doppler Measurement for Iridium NEXT Signals.pdf
