A5064770488- GNSS positioning and interference
- Indoor and Outdoor Localization Technologies
- Wireless Communication Networks Research
- Inertial Sensor and Navigation
- Advanced Wireless Communication Techniques
- Direction-of-Arrival Estimation Techniques
- Radio Astronomy Observations and Technology
- Antenna Design and Optimization
- Advanced Frequency and Time Standards
- Target Tracking and Data Fusion in Sensor Networks
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Advanced MIMO Systems Optimization
- Radio Wave Propagation Studies
- Satellite Communication Systems
- Robotics and Sensor-Based Localization
- Speech and Audio Processing
- Power Line Communications and Noise
- Spacecraft Design and Technology
- Antenna Design and Analysis
- Radar Systems and Signal Processing
- Astronomical Observations and Instrumentation
- Air Traffic Management and Optimization
- Advanced Adaptive Filtering Techniques
- Electromagnetic Compatibility and Measurements
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2016-2025
RWTH Aachen University
2015-2025
SA Technologies (United States)
2023
Institute of Navigation
2015-2020
University of Kaiserslautern
2000-2019
Stanford University
2019
European Commission
2019
Federal Aviation Administration
2019
Kharkiv National University of Radio Electronics
2019
Universidad de Valladolid
2019
In the 3/sup rd/ Generation Partnership Project (3GPP) time division CDMA (TD-CDMA) has been selected as air interface for TDD (time duplexing) bands of generation (3G) mobile radio systems. case same channel impulse responses are valid both uplink and downlink. state-of-the-art TD-CDMA characterized by joint data detection (JD) this equality cannot be exploited enhancing system performance reducing complexity. A novel downlink transmission scheme is proposed. This termed (JT). It utilizes...
A especially favorable multiple-input multiple-output (MIMO)-based concept for future mobile radio systems consists of the application joint detection (JD) in uplink and transmission (JT) downlink. By this, all computational complex signal processing is shifted to base station (BS), resulting low-complexity stations. Both JD JT require channel knowledge at BS which, if time-division duplexing applied, can be obtained by training signal-based estimation uplink. Unfortunately, estimates are...
Array processing proved itself in the last decades as a powerful approach to suppress harmful radio frequency interference. However, interference mitigation spatial domain can also lead attenuation and loss of desired Global Navigation Satellite System (GNSS) signals that are not sufficiently separated by their directions arrival from interfering signals. In order overcome this effect, paper proposes an combine array vector tracking single receiver. Formerly, loops have been shown deliver...
<h3>Summary</h3> Camera-based visual navigation has great potential for various applications, especially in satellite-signal-degenerated environments. However, the lack of integrity protection constrained its utilization safety-critical applications. Integrity characterizes quality information that a system delivers. frameworks have been developed over decades satellite navigation, and continue to play an essential role applications like civil aviation. Nevertheless, there are several...
The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations different facilities to study its performance. most attractive feature of this detector is ultra-low material budget, which 0.28\% X/X$_0$ and can be further reduced by decreasing the thickness gas traversed incident particles. Thus, it provides excellent position reconstruction multi-scattering. This consists two GEM-TPCs...
Integrating the ATLAS/BNL VMM3a ASIC (Application Specific Integrated Circuit) into RD51/SRS (Scalable Readout System) provides a self-triggered continuous readout system for various gaseous detectors. Since allows flexible parameters, such as switching polarity, adjusting electronics gain or different peaking times, settings can be adjusted wide range of The particles to recorded with MHz interaction rate in energy, space, and time. will introduced beginning, short examples given...
Abstract The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations different facilities to study its performance. most attractive feature of this detector is ultra-low material budget, which 0.28% X/X 0 and can be further reduced by decreasing the thickness gas traversed incident particles. Thus, it provides excellent position reconstruction multi-scattering. This consists two...
This paper presents a User Range Accuracy (URA)/Signal-in-Space (SISA) analysis to support ARAIM based on time-dependent statistical characterization of orbit and clock error observations. By comparing precise orbits broadcast ephemeris for each individual GPS Galileo satellite, this work computes the Signal-in-Space Error (SISRE) that needs be overbounded by URA/SISA value included in Integrity Support Message (ISM). Service data from January 2008 February 2015 March June are processed,...
A novel downlink transmission scheme for time-slotted CDMA employing time division duplexing (TDD) is proposed. It utilises the knowledge of channel impulse responses at BS transmitter in such a way that receivers MSs estimators are no longer required and computational expense data detection dramatically reduced.
This paper summarizes the development of safety-of-life receivers for global navigation satellite systems. Two receiver systems have been successfully fabricated, integrated, and tested by means field experiments. Implementation issues these two are described in this paper. The third generation receiving system is based on a dual-band approach with antennas that able to separate frequency bands using outputs. Measured results show high isolation between can be achieved.
The combination of Global Navigation Satellite Systems (GNSS) and Inertial System (INS) has become the baseline many vehicular applications. However, in challenging GNSS scenarios, classical GNSS/INS integration estimators are very sensitive to multiple measurement faults (e.g., due multipath). In this work, we design a tightly-coupled between INS where modify update step Extended Kalman Filter (EKF) consider more robust estimators, like M-estimators. We different faulty scenarios...
This paper presents the performance analysis of signals from Galileo satellites in E1 and E5a frequency bands GPS L5 as measured by DLR's experimental ground-based augmentation system. The results show that raw noise multipath level are smaller than L1. new also less sensitive to choice carrier-smoothing time constant. Furthermore, inter-frequency biases affect dual-frequency processing investigated. These differ between depend on satellite receiver hardware, but they can be determined a...
The paper presents several novel techniques for detection of spoofing/meaconing signals using the direction-of-arrival (DOA) measurements available in a multi-antenna navigation receiver. is based on comparison and statistically testing measured DOAs against expected DOAs. are computed receiver almanac ephemeris. attitude antenna array assumed to be unknown therefore has estimated as part joint spoofing detection/estimation problem. It shown that statistics DOA estimation error signal...
Accurate, robust and reliable positioning timing has become crucial for a wide spectrum of applications. New technologies will further improve the services offered by Global Navigation Satellite Systems (GNSSs). Optical are promising candidates to achieve significant improvements in terms accuracy, robustness reliability GNSSs near future. First foremost, optical inter-satellite links (OISLs) clock show enormous potential future applications at core next generation GNSS architectures. Both...
A characterization of the signal anomaly SVN49 is presented. mathematical model developed to relate observed multipath internal reflection. The analyses provided are based on measurements, which have been collected during a dedicated tracking campaign with 30-m dish antenna. Data L1 and L2 frequency four different receivers. In addition, IQ samples recorded directly spectrum analyzer. combination receiver measurements analyzed demonstrate effect reflections correlator spacing. capability...
An international maritime measurement campaign was done to detect and record radio frequency interferences in the Satellite Navigation bands. The system, installed on a large container ship, consists of conformal seven elements antenna array, an ad-hoc data recorder system multi-antenna navigation receiver prototype. In this paper, is briefly presented, together with proposed detection analysis methodology. Pertinent results measurements are shown, including detected interferences, its...
An international maritime measurement campaign was done to detect and record radio frequency interferences in the Satellite Navigation bands. The system, installed on a large container ship, consists of conformal seven elements antenna array, an ad-hoc data recorder system multi-antenna navigation receiver prototype. In this paper, detection analysis methodology is proposed pertinent results three months measurements are shown.