GNSS

Towards integrity monitoring for GNSS-based time synchronization in technical applications

Sep 20, 2024

Bounding the residual tropospheric error by interval analysis

GNSS integrity monitoring requires proper bounding to characterize all ranging error sources. Unlike classical approaches based on probabilistic assumptions, our alternative integrity approach depends on deterministic interval bounds as inputs. The intrinsically linear uncertainty propagation with intervals is adequate to describe remaining systematic uncertainty, the so-called imprecision. In this contribution, we make a proposal on how to derive the required intervals in order to quantify and bound the residual error for empirical troposphere models, based on the refined sensitivity analysis via interval arithmetic. This will contribute to a realistic uncertainty assessment of GNSS-based single point positioning.

Dec 24, 2022

Advances in deterministic approaches for bounding uncertainty and integrity monitoring of autonomous navigation
Advances in deterministic approaches for bounding uncertainty and integrity monitoring of autonomous navigation

In this contribution, we aim to demonstrate the feasibility of applying the alternative integrity approach to autonomous navigation in terms of several key aspects, i.e., the handling of GNSS multipath effect in the urban environment, fault detection and exclusion, and further consideration of applying weighting models.

Sep 20, 2022

Towards integrity for GNSS-based urban navigation - challenges and lessons learned

For safety critical applications like autonomous driving, high trust in the reported navigation solution is mandatory. This trust can be expressed by the navigation performance parameters, especially integrity. Multipath errors are the most challenging error source in GNSS since only partial correction is possible. In order to ensure high integrity of GNSS-based urban navigation, signal propagation mechanisms and the potential error sources induced by the complex measurement environment should be sufficiently understood.

Jun 5, 2022

Deterministic approaches for bounding GNSS uncertainty: A comparative analysis

This paper introduces two deterministic approaches for GNSS uncertainty bounding and compares them with the conventional least-squares method theoretically and experimentally with simulated and real measurements.

Apr 7, 2022

Improved observation interval bounding for multi-GNSS integrity monitoring in urban navigation

Sep 20, 2021