Multi-epoch double-differenced pseudorange observation (MDPO) is a dual-satellite lunar
navigation algorithm specially designed for a precursor mission, using a minimum number of …

In view of the upcoming missions to obtain resources from the lunar surface, it is essential to
have highly-accurate navigation systems to locate surface vehicles in shadowed regions. In …

In this study, dual-satellite lunar global navigation systems that consist of a constellation of
two navigation satellites providing geo-spatial positioning on the lunar surface were …

Aiming to provide navigational framework to upcoming early lunar exploration missions by
lunar rovers, interests in robust and low-cost global satellite navigation systems (GNSS) …

Needs of lunar PNT systems are expanding for upcoming lunar missions such as the
Artemis programs. NASA, ESA, and JAXA have been working on respective lunar PNT …

The moon transfer orbit (MTO) is a path that a spacecraft going to the moon actually flies and
the spacecraft navigation on the MTO is becoming highly important as space agencies are …

This paper proposes the differential positioning technique to reduce the Signal-In-Space
Range Error (SISRE) of LNSS satellites and the coordinate transformation errors from Earth …

There are two existing multi-GNSS positioning methods,(1) separate receiver clock
parameter is set for each constellation,(2) estimating intersystem biases (ISBs) in advance to …

Positioning of high-orbit spacecraft using the Global Navigation Satellite System (GNSS) is
an important expansion application of GNSS. With the introduction of GNSS such as Beidou …

This paper addresses the navigation problem for a moving object at the lunar South Pole
region using our Lunar Navigation Satellite System (LNSS). The LNSS is a satellite …