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View article: Performance Assessment of Galileo High Accuracy Service for PPP and Atmospheric Correction Impact in 2023
Performance Assessment of Galileo High Accuracy Service for PPP and Atmospheric Correction Impact in 2023 Open
Since early 2023, the Galileo High Accuracy Service (HAS) has been officially providing free corrections for Precise Point Positioning (PPP). The HAS is structured into two service levels. The first level (SL1), currently available worldwi…
View article: Towards calibration of GNSS receiver hardware delays for improving geodetic reference systems through clock ties. A requirements analysis for developing a GNSS pseudolite transmission chain
Towards calibration of GNSS receiver hardware delays for improving geodetic reference systems through clock ties. A requirements analysis for developing a GNSS pseudolite transmission chain Open
The growing demand for Earth science applications poses challenges in improving geodetic reference frames. Systematic errors currently restrict the accuracy of these frames because the classical geometric ties between multiple geodetic tec…
View article: GNSS Software-Defined Radio: History, Current Developments, and Standardization Efforts
GNSS Software-Defined Radio: History, Current Developments, and Standardization Efforts Open
Taking the work conducted by the global navigation satellite system (GNSS) software-defined radio (SDR) working group during the last decade as a seed, this contribution summarizes, for the first time, the history of GNSS SDR devel-opment.…
View article: The Galileo High-Accuracy Service: Evaluating the Quality of the Corrections and Initial PPP Performance
The Galileo High-Accuracy Service: Evaluating the Quality of the Corrections and Initial PPP Performance Open
The Galileo High-Accuracy Service (HAS) is providing free Precise Point Positioning (PPP) corrections for Galileo and GPS satellites through the E6b signal and the internet. Currently, HAS should provide a horizontal and vertical 95% accur…
View article: Theoretical Upper and Lower Limits for Normalized Bandwidth of Digital Phase-Locked Loop in GNSS Receivers
Theoretical Upper and Lower Limits for Normalized Bandwidth of Digital Phase-Locked Loop in GNSS Receivers Open
Determining the loop noise bandwidth and the coherent integration time is essential and important for the design of a reliable digital phase-locked loop (DPLL) in global navigation satellite system (GNSS) receivers. In general, designers s…
View article: PRN Sequence Estimation with a Self-Calibrating 40-Element Antenna Array
PRN Sequence Estimation with a Self-Calibrating 40-Element Antenna Array Open
This work explores the use of a low-cost global navigation satellite system (GNSS) antenna array including front-ends and a global navigation satellite system (GNSS) software receiver to receive signals of opportunity (SoO) whose pseudoran…
View article: GNSS User Technology: State-of-the-Art and Future Trends
GNSS User Technology: State-of-the-Art and Future Trends Open
Advances in the miniaturization, computational capabilities, and cost reduction of semiconductor technology have made global navigation satellite systems (GNSSs) the favorite choice for positioning. Currently, positioning is a key factor f…
View article: ION GNSS software‐defined radio metadata standard
ION GNSS software‐defined radio metadata standard Open
The past several years have seen a proliferation of software-defined radio (SDR) data collection systems and processing platforms designed for or applicable to satellite navigation (satnav) applications. These systems necessarily produce d…
View article: Errata to “State Estimation Methods in Navigation: Overview and Application”
Errata to “State Estimation Methods in Navigation: Overview and Application” Open
In the above-named work [ibid., vol. 35, no. 12, pp. 16–31, Dec 1, 2020], the affiliation for the author Sanat K. Biswas was incorrectly listed. The affiliation for this author should be Indraprastha Institute of Information Technology, De…
View article: ION Software-Defined Radio Metadata Standard Final Report
ION Software-Defined Radio Metadata Standard Final Report Open
The ION GNSS SDR Metadata Standard describes the formatting and other essential PNT-related parameters of sampled data streams and files. This allows processors to seamlessly consume such data without the need to input these parameters man…
View article: Optimal Particle Filter Weight for Bayesian Direct Position Estimation in a GNSS Receiver
Optimal Particle Filter Weight for Bayesian Direct Position Estimation in a GNSS Receiver Open
Direct Position Estimation (DPE) is a rather new Global Navigation Satellite System (GNSS) technique to estimate the user position, velocity and time (PVT) directly from correlation values of the received GNSS signal with receiver internal…
View article: Considerations for Future IGS Receivers
Considerations for Future IGS Receivers Open
Future IGS receivers are considered against the backdrop of GNSS signal modernization
\nand the IGS’s goal of further improving the accuracy of its products. The purpose of this paper is to
\nprovide IGS members with a guide to making deci…
View article: Benchmarking CPUs and GPUs on embedded platforms for software receiver usage
Benchmarking CPUs and GPUs on embedded platforms for software receiver usage Open
Smartphones containing multi-core central processing units (CPUs) and powerful many-core graphics processing units (GPUs) bring supercomputing technology into your pocket (or into our embedded devices). This can be exploited to produce pow…
View article: More Than We Ever Dreamed Possible: Processor Technology For Gnss Software Receivers In The Year 2015
More Than We Ever Dreamed Possible: Processor Technology For Gnss Software Receivers In The Year 2015 Open
Computational power continues to increase at a rapid pace and unlike other areas of technology, this trend is not expected to slow down in the foreseeable future. Software GNSS receivers fully exploit these developments to steadily increas…