Motivated both by the advantage of Hatch filter gain over Kalman-type gain in carriersmoothed-code filtering, this paper proposes a position-domain Hatch filter for differential kinematic satellite positioning. In general, position-domain filtering is more attractive than range-domain filtering since less information is lost if changes in the visible satellite set occurs frequently. A new inter...

Measuring digital picture quality, as perceived by human observers, is increasingly important in many applications in which humans are the ultimate consumers of visual information. Standard dynamic range (SDR) images provide 8 bits/color/pixel. High dynamic range (HDR) images, usually created from multiple exposures of the same scene, can provide 16 or 32 bits/color/pixel, but need to be tonema...

The vast majority of video content existing today is in Standard Dynamic Range (SDR) format and there is a strong interest in upscaling this content for upcoming High Dynamic Range (HDR) displays. Tone expansion or inverse tone mapping converts SDR content into HDR format using Expansion Operators (EO). In this paper, we show that current EO’s do not perform as well when dealing with content of...

TianQin is a proposed space-based gravitational-wave detector designed to operate in circular high Earth orbits. As sequel [Zhang et al. Phys. Rev. D 103, 062001 (2021)], this work provides an analytical model account for the perturbing effect of Earth's gravity field on range acceleration noise between two satellites. For such ``orbital noise,'' contribution dominates above $5\ifmmode\times\el...

Highly magnetised rapidly spinning neutron stars are widely considered to be natural sites for acceleration of charged particles. Powerful acceleration mechanism due to unipolar induction is thought to operate in the magnetospheres of isolated neutron stars, bringing the particles to ultrarelativistic energies at the expense of the neutron star rotational energy, with inevitable emission of hig...

[1] We use monthly measurements of time-variable gravity from the GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission to determine the ice mass-loss for the Greenland and Antarctic Ice Sheets during the period between April 2002 and February 2009. We find that during this time period the mass loss of the ice sheets is not a constant, but accelerating with time, i.e., that ...

A statistical study of ®eld-aligned electron beams associated with up ̄owing ion conics is presented from Exos-D (Akebono) observations below 10 000 km. The electron beams are narrowly collimated along the ®eld line and generally have energies of several tens of eV. They are divided in the analysis into three types: up ̄owing, down ̄owing, and counterstreaming. All the types of electron beams are ...

It is well-known that vector delay and frequency locked loops (VDFLLs) have several advantages over traditional scalar tracking loops in GNSS receivers, especially in mobile platforms subject to poor signal environments and accelerations. This paper presents an approach to further VDFLL performance improvement for ground-based mobile receivers which apparently has not yet been exploited. The pe...