The dynamic Allan variance (DAVAR) measures the stability variations of precise clocks and
oscillators. When an anomaly occurs, the DAVAR changes with time, its shape depending …

Lunar exploration is considered to be one of the great capstones for the space industry over
the next years. The exciting prospective of exploiting the Moon's potential, both for scientific …

This paper presents a frequency jump detector for atomic clocks. The detector considers
both fast frequency jumps, which are abrupt variations of the clock frequency trend, and slow …

Nowadays, several space agencies are emphasizing the interest for the human return to the
Moon. This renaissance in lunar exploration involves both the public and private sectors and …

We study the problem of the first passage time through a constant boundary for a jump
diffusion process whose infinitesimal generator is a nonlocal Jacobi operator. Due to the …

Abstract NavIC (Navigation with Indian Constellation) is a regional satellite navigation
system called Indian Regional Navigation Satellite System (IRNSS). The NavIC is presently …

The abnormal frequencies of an atomic clock mainly include frequency jump and frequency
drift jump. Atomic clock frequency anomaly detection is a key technique in time-keeping. The …

Satellite clock error is a key factor affecting the positioning accuracy of a global navigation
satellite system (GNSS). In this paper, we use a gated recurrent unit (GRU) neural network to …

Although there are already several real-time precise positioning service providers,
unfortunately, not all users can use the correction information due to either cost of the …

As Satellite Clock Bias (SCB) prediction may be affected by various factors such as periodic
items, sampling length, and stochastic items, a fusion-based prediction method is proposed …