United Estimation of Time Delay and Frequency Drift in XNAV

Zhen Ni He; Bao Jun Fei; Guo Zheng Yao; Jian Du

doi:10.4028/www.scientific.net/AMM.565.187

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 565United Estimation of Time Delay and Frequency...

United Estimation of Time Delay and Frequency Drift in XNAV

Abstract:

The original navigation information of XNAV is the arrival time series of X-ray photons received by spacecraft. The key issue is to estimate parameters,including time delay, frequency drift and change rate of the observed profile by comparing it with corresponding standard profile in “folding process”. This paper illustrates the equation of equiphase point in time series of photons, and gets the initial approximate value of time delay and frequency drift by Larsson cycle folding and coherent function methods. Higher-order approximation is obtained by least square method, and more precise value is calculated by cyclic iteration. Simulation result indicates our method can achieve high precision even without noise eliminating and smoothing process. The proposed method, maybe kind of complicate, it proves the feasibility of XNAV.

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Periodical:

Applied Mechanics and Materials (Volume 565)

Pages:

187-193

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.565.187

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Online since:

June 2014

Authors:

Zhen Ni He*, Bao Jun Fei, Guo Zheng Yao, Jian Du

Keywords:

Least-Square Method (LSM), Parameters Estimation, Pulse Profile, X-Ray Pulsar-Based Navigation (XNAV)

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