This article provides a review on X-ray pulsar-based navigation (XNAV). The review starts
with the basic concept of XNAV, and briefly introduces the past, present and future projects …

The recent flight experiments with Neutron Star Interior Composition Explorer (NICER) and
Insight-Hard X-ray Modulation Telescope (Insight-HXMT) have demonstrated the feasibility …

THERE will be an increasing number of deep space explorers in the future, which will put a
heavy burden on the current Earthbased deep space networks. Thus, it is necessary for …

Time delay is a novel celestial navigation measurement that can provide the distance
information of the spacecraft relative to the nearby celestial body. Combining time delay …

Pulsar navigation is a promising autonomous navigation system for spacecraft, which is
applicable to the entire solar system. However, the pulsar's directional error and the onboard …

Purpose X-ray pulsar navigation (XPNAV) is an autonomous celestial navigation technology
for deep space missions. The error in the pulse time of arrival used in pulsar navigation is …

A reliable and autonomous navigation system is crucial for achieving high survivability of
spacecraft. As a novel autonomous navigation system, an inertial/spectral redshift (INS/SRS) …

X-ray pulsar-based navigation (XNAV) is a promising autonomous navigation method, and
the pulse phase is the basic measurement of XNAV. However, the current methods for …

Estimating the pulse phase from the recorded photons from pulsars is one of the key
problems in X-ray pulsar-based navigation (XNAV). The current flight experiments on XNAV …

Purpose This paper aims to improve the performance of the autonomous optical navigation
using relativistic perturbation of starlight, which is a promising technique for future space …