Realization Limits of Impulse-Radio UWB Indoor Localization Systems

In this work, the realization limits of an impulse-based Ultra-Wideband (UWB) localization system for indoor applications have been thoroughly investigated and verified by measurements. The analysis spans from the position calculation algorithms, through hardware realization and modeling, up to the localization experiments conducted in realistic scenarios. The main focus was put on identification and characterization of limiting factors as well as developing methods to overcome them

Aufbau eines vollpolarimetrischen Radiometerempfängers für das W-Band

Die Entwicklung und der Aufbau eines vollpolarimetrischen Radiometerempfängers für das W-Band wird beschrieben. Messergebnisse zu einzelnen Baugruppen sowie erste abbildende Messungen werden diskutiert

Realization Limits of Impulse-Radio UWB Indoor Localization Systems

In this work, the realization limits of an impulse-based Ultra-Wideband (UWB) localization system for indoor applications have been thoroughly investigated and verified by measurements. The analysis spans from the position calculation algorithms, through hardware realization and modeling, up to the localization experiments conducted in realistic scenarios. The main focus was put on identification and characterization of limiting factors as well as developing methods to overcome them

Vorbereitende Radio-Interferenz-Messungen vom 10. März 2008 für eine SMOS-Flug-Messkampagne

Messungen von Radiointerferenzen östlich von München im Frequenzbereich 1300-2000 MHz für eine SMOS Flug-Kampagne

UWB Localization System for Indoor Applications: Concept, Realization and Analysis

A complete impulse-based ultrawideband localization demonstrator for indoor applications is presented. The positioning method, along with the method of positioning error predicting, based on scenario geometry, is described. The hardware setup, including UWB transceiver and time measurement module, as well as the working principles is explained. The system simulation, used as a benchmark for the quality assessment of the performed measurements, is presented. Finally, the measurement results are discussed. The precise analysis of potential error sources in the system is conducted, based on both simulations and measurement. Furthermore, the methods, how to improve the average accuracy of 9 cm by including the influences of antennas and signal-detection threshold level, are made. The localization accuracy, resulting from those corrections, is 2.5 cm

Passive microwave remote sensing - a tool for maritime surveillance?

Microwave radiometry deals with the measurement of the natural thermally caused electromagnetic radiation of matter at a physical temperature above 0K. In the case of Earth observation significant contrasts can be observed between reflective and absorbing materials due to the impact of reflected sky radiation of cosmic origin. The main MMW windows for sufficient atmospheric penetration and low sky brightness temperatures are at frequencies around 35, 94, 140 and 220GHz. For Earth observation, an approximate brightness temperature range from 3K to more than 300K can be observed. In the microwave region the spatial two-dimensional brightness temperature distribution can be used as a daytime and almost weather independent indicator for many different physical phenomena. Hence, interesting application areas incorporate geo science, climatology, agriculture, pollution and disaster control, detection, reconnaissance, surveillance, and status registration in general. Since a few years security applications like personnel screening and the monitoring of critical infrastructures are also of major interest. Many of those applications require high spatial and radiometric resolution, high precision, large fields of view, and high frame rates. The paper gives a brief introduction to the physical background of microwave radiometry and illustrates the three mostly considered imaging principles, the linescanner approach, the innovative aperture synthesis and the focal plane array technique. Typical examples from current practice of security related imaging and basic experimental measurements for future applications and of maritime scenarios are shown