A5080626913- GNSS positioning and interference
- Radio Wave Propagation Studies
- Inertial Sensor and Navigation
- Ionosphere and magnetosphere dynamics
- Precipitation Measurement and Analysis
- Robotics and Sensor-Based Localization
- Robotic Path Planning Algorithms
- Air Traffic Management and Optimization
- Indoor and Outdoor Localization Technologies
- Radio Astronomy Observations and Technology
- Robotic Locomotion and Control
- Satellite Communication Systems
- Robotics and Automated Systems
- Modular Robots and Swarm Intelligence
- Maritime Navigation and Safety
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Target Tracking and Data Fusion in Sensor Networks
- Soft Robotics and Applications
- Aerospace and Aviation Technology
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2019-2023
Tata Elxsi (India)
2013
In this paper we discuss the first results from a set of flight experiments. The objective was to show that terrestrial ranging can support aviation services with sufficient accuracy for non-precision approach. experimental setup is based on using LDACS signals provide pseudorange measurements. data analysis reveals position solutions are compliant RNP 1 standards. We also propose feasibility 0.3 as ranging.
This article proposes a real-time capable tropospheric delay model for terrestrial radio navigation systems used aviation. Its functional scope ranges from elevation angles below the local horizon to zenith. Flight experiments were carried out quantify improvement in service coverage achieved measurements close and horizon, with aircraft distances order of 250 km. Mismodeling delays at these can result slant-range error several magnitude greater than accuracy nav-aids, adequately accounting...
This project paper is proposed on an autonomous tree climbing robot, making the robot realize environment and climb a autonomously. Inspired by inchworms, algorithm reconstructs shape of simply use limit switches. It reveals how realization can be achieved with limited information. challenging task as complex irregular. The its well balanced mechanical design so equipped that it surfaces minimal sensing resources(limit switches). We have out for to only regular irregular shaped trees but not...
In the current remodernisation of Air Traffic Management, APNT systems based on terrestrial navigation aids are conceived as backup solutions in case a GNSS outage. this paper, we address widely acknowledged problem degraded geometries ranging for aviation. We analyze impact have ill-posedness positioning algorithm by means condition number. Finally, propose an approach regularized least squares estimator suitably designed these specific conditions.
This paper proposes a real-time capable global tropospheric duct threat monitor to predict the additional delays resulting from anomalous atmospheric conditions like ducting. These effects are not seldom with probability of occurrence in order 90% continental and coastal regions globally. Mismodeling these can result tens meters slant-range error adequately accounting them translates improved accuracy tighter integrity bounds. The proposed uses ERA-5 numerical weather model (NWM) data...
We propose a new mapping function for ground-to-air radio links. validated the using data from numerical weather model over an entire year, by comparing it with estimated ray-tracing refractivity profile of troposphere (i.e. space traversed link). Two asymptotic expansions are derived, that tropospheric delay range elevation angles zenith down to 0.5?.
The propagation of electromagnetic waves emitted from ground-based transmitters is influenced by the stratification atmosphere. In extreme superrefractive situations characterized strong temperature inversions or vertical gradients moisture, ranging signals are deflected towards ground (ducting) through large atmospheric bending, which often results in additional delay. A global ducting climatology based on 10 years ERA-5 re-analysis European Centre for Medium-Range Weather Forecast (ECMWF)...
We propose a new tropospheric mapping function for ground-to-air radio links. The is based on conventional approaches, as used in satellite navigation, but needs adapting to the specifics of terrestrial ranging. validate resulting using data from numerical weather models over an entire year. approach provides delays that are accurate within two centimeters, elevation angles 90 degrees down 3.
This paper introduces a technique to transform between geometric and barometric estimates of altitude vice-versa. Leveraging forecast numerical weather models, the method is unbiased has vertical error with standard deviation around 30 m (100 ft), regardless aircraft altitude, which makes it significantly more precise than established comparable conversion functions. result may find application in various domains civil aviation, including RNP, systemized airspace, automatic landing systems.
The process of verifying correct operation terrestrial navigation aids for civil aviation (NavAids) is based on flight inspection, which requires dedicated flights with specialized aircraft and highly-skilled personnel to the matter. A way reducing expenses while asserting functioning all relevant NavAids would be aggregate data collected from scheduled revenue flights. This paper proposes a method that will create this capability discusses foreseeable operational changes need enacted become...
In the context of a High accuracy SBAS-PPP service, we require different tropospheric delay model than existing provided in DO-229F (RTCA, 2020). This will yield more reliable results, but also reduce convergence times with desired to assist faster time for PPP solution, which is imperative employing corrections high integrity safety-of-life applications. this paper describe real-time capable global methodology estimate zenith and associated standard deviation values SBAS applications based...
This paper proposes a residual tropospheric error model for terrestrial radio navigation systems used civil aviation. Its functional scope ranges from elevation angles above 0.2° to zenith and aircraft distances up 250 km. Existing GNSS employs global constant only the variance of delay error, is not directly applicable ranging. The proposed encompasses errors mapping functions, models atmospheric effects like ducting. In addition, derived consider variability as function angle range....