Antennen und Strahlungsfelder

Kark, Klaus W.

doi:10.1007/978-3-8348-9755-8

Cited by 9 publications

(5 citation statements)

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“…15 it can be seen that the antenna gain is not a given variable. This is due to equation (3) for the calculation of the helix antennas gain according to (Kark 2010). This equation cannot be solved for n, so the design of the antenna has to be done iteratively.…”

Section: Analysis Of Helix Antenna Dependenciesmentioning

confidence: 99%

Dependency Analysis in Complex System Design using the FireSat example

Größ

Rudolph

2012

INCOSE International Symp

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Abstract. Using the FireSat mission from literature (see Larson 1999), the satellite design process is analyzed. Prior to this analysis, the physical and functional properties of the satellite system are encoded in a graph-based design language. During the automated design language compilation process several graph representations are generated. These graph representations are generated from the design constraints. From the mathematical analysis of the graphs three important interpretations can be derived. The first interpretation concerns the derivation of the exchange rates based on the analysis of the functional coupling. The second interpretation yields a feasible design sequence. Third, a generic backtracking method for resolving engineering design conflicts is presented and illustrated with an antenna example. All three interpretations are illustrated through a detailed view into the FireSat communication subsystem. Furthermore, the demonstration of the method closes with a system-level analysis of the satellite design process to show its applicability to all levels of detail in system design. Complex System DesignFor the design of complex engineering systems such as a satellite, using model-based systems engineering (MBSE) techniques become more and more a state of the art approach. For the design of complex software systems, the model driven architecture (MDA) approach was developed. Both of the MBSE and the MDA technique have commonalities but have not yet merged into a common wording. The software engineering terms of a platform independent model (PIM), a platform specific model (PSM), or a domain specific language (DSL) have without any doubt their correspondences in the engineering domain. Yet this mapping is not yet established or agreed on and should therefore be the topic of future consideration. In engineering design, many efforts have been taken to establish and develop data models (e.g. (Eisenmann 2009)) and modeling techniques (e.g. Delp 2008Delp , 2009) in the field of space systems. In addition to these approaches, further interesting potential is brought up by MBSE in the field of the model-based analysis of the designed systems. Such analyses contain not only the structural and mathematical analysis of the systems, but also the establishment of simulations from the systems engineering models. In (Schaus 2011) for example, the benefits of modeling simulation models are pointed out. In (D`Ambrogio 2010) the model-driven architecture (MDA) approach to the development of simulators is shown. On the basis of these undertakings, a clear systematic methodology for the creation of systems and variants thereof has to be established. The dependency analysis shown in this paper is an excerpt from a larger satellite design language based on the Unified Modeling Language (UML). Initiated by the graph-based satellite design language of (Schaefer 2005), an updated version of this design language was developed by (Gross 2011). The features of a graph-based design language are hereby combined with the sema...

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Section: Analysis Of Helix Antenna Dependenciesmentioning

confidence: 99%

Dependency Analysis in Complex System Design using the FireSat example

Größ

Rudolph

2012

INCOSE International Symp

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“…This corresponds to a Taylor series expansion with termination according to the linear term [24]. If we additionally neglect the electromagnetic interaction between different point scatterers of the whole satellite, the radar data for s tot point targets can be expressed as

\boldsymbol{M}\left({\boldsymbol{r}}_{0},k\right)=\sum\limits _{n=0}^{{s}_{\text{tot}}}\boldsymbol{S}\left({\boldsymbol{r}}_{n},k\right)\frac{{e}^{-\mathrm{j}2k{\boldsymbol{r}}_{\mathbf{n}}{\boldsymbol{e}}_{0}}}{{r}_{n}^{2}}.

…”

Section: Signal Theorymentioning

confidence: 99%

High‐resolution inverse synthetic aperture radar imaging of satellites in space

Anger,

Jirousek,

Dill

et al. 2023

IET Radar Sonar & Navi

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In view of the increasing number of space objects, comprehensive high‐quality space surveillance becomes ever more important. Radar is a powerful tool that, in addition to detection and tracking of objects, also enables spatially high‐resolution imaging independent of daylight and most weather conditions. Together with the technique of Inverse Synthetic Aperture Radar (ISAR), very high‐resolution and distance‐independent two‐dimensional images can be obtained. However, advanced high‐performance radar imaging of space objects is a complex and demanding task, touching many technological and signal processing issues. Therefore, besides theoretical work, the Microwaves and Radar Institute of German Aerospace Center (DLR) has developed and constructed an experimental radar system called IoSiS (Imaging of Satellites in Space) for basic research on new concepts for the acquisition of advanced high‐resolution radar image products of objects in a low earth orbit. Based on pulse radar technology, which enables precise calibration and error correction, IoSiS has imaged space objects with a spatial resolution in the centimetre range, being novel in public perception and accessible literature. The goal of this paper is therefore to communicate and illustrate comprehensively the technological steps for the construction and successful operation of advanced radar‐based space surveillance. Besides the basic description of the IoSiS system design this paper outlines primarily useful theory for ISAR imaging of objects in space, together with relevant imaging parameters and main formulae. All relevant processing steps, necessary for very high‐resolution imaging of satellites in practice, are introduced and verified by simulation results. Finally, a unique measurement result demonstrates the practicability of the introduced processing steps and error correction strategies.

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“…For the LOS path (n ¼ 0) it holds C 0 ¼ 1. For the reflected paths, C n can be derived from the Fresnel Formulas [17] with some simplifications for the special scenario 13 (see e.g. [24]):…”

Section: Improved Channel Model: Downlinkmentioning

confidence: 99%

Modeling of the Passive UHF RFID Multipath Channel for Tag Read Region Estimation

Cremer

Dettmar

Kronberger

et al. 2015

Int J Wireless Inf Networks

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The estimation of tag read and no-read zones is the most important preliminary planning step in radio-frequency identification (RFID) system installations. Today, in the ultra-high frequency band (UHF: 860-960 MHz), this estimation is based on either a free-space or a simplified multipath channel model for the signal propagation in the wireless link between the interrogator and the tag. Using measurements in a standard multipath indoor environment, this paper proves that recent approaches are not able to estimate tag read regions in a given passive UHF RFID system setup with high reliability. A modified multipath channel model is presented, that considers environmental and setup specific properties as well as an arbitrary number of signal paths to achieve a more accurate estimation. It includes the orientation of the tag antenna and the interrogator antenna, their polarizations and their threedimensional gain patterns, as well as complex reflection coefficients for the reflected signal paths. The presented model equations are ready to use and are implemented into a flexible, easy-to-use, and easy-to-setup simulation environment with low computing times. It predicts the tag read regions separately for the downlink and the uplink and then combines the results for an overall estimation. The comparison of read region simulations and tag readability measurements shows that the our model delivers a 87.2 % reliability in the prediction of the tag read regions. The results of the estimation can be used to optimize RFID system setups in a way that read regions are maximized.

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Antennen und Strahlungsfelder

Cited by 9 publications

References 0 publications

Dependency Analysis in Complex System Design using the FireSat example

Dependency Analysis in Complex System Design using the FireSat example

High‐resolution inverse synthetic aperture radar imaging of satellites in space

Modeling of the Passive UHF RFID Multipath Channel for Tag Read Region Estimation

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