Studies related to Spacecraft and Aircraft Communication
The following list provides examples of studies we have performed:
Mode S Interference Effects
This study addressed the Mode S interference properties and related residual error probabilities of the Mode S data link. The study included:
Design and Development of a bench system for physical generation and demodulation of SSR Mode S signals (see figure)
Investigation of the error patterns and implications on circuit design
Derivation of the residual error probabilities
The study was funded by the Deutsche Forschungsgemeinschaft.
Space Data Network
The objective of this study was to identify protocols and technologies enabling a cost-effective solution for a data network providing transparent transport and distribution of payload data to users. The study also addressed state-of-the-art communication principles for video conferencing, shared documentation handling and the exchange of both still images and motion pictures.
The study was funded by ESA
Technical Studies on Mode S RF
Several studies of technical aspects of Mode S RF-Scenarios have been performed. These include an analysis of the limiting effects of the interrogation rates of Mode S interrogators.
The study was funded by
RF effect of different SSR Interrogator-Transponder Scenarios
This study analysed the impact of introducing Mode S. A theoretical model was constructed to describe (i) the coupling between the Inter rogations of Interrogators and/or ACAS (ii) the Transponder occupation and (iii) the receiving Interrogator fruit. The magnitude of the modelled effects was calculated using spreadsheets.
The study was funded by
This study analysed the capabilities and usability of Internet based tools and protocols for video conferencing, streaming video, data sharing, etc. with respect to telescience applications.
The CIMS Digital Recording and Analysis System (D-RAS) provides long term recording capabilities for analogue signals and the offline analysis of the recorded data. A D-RAS version is currently used as CORAL by DFS Deutsche Flugsicherung GmbH.
D-RAS allows to record between 1 and 4 analogue signals on a digital storage medium. The digital recording method prevents any degradation of the recorded signals.
After the recording the data can be evaluated by the D-RAS analysis facility. The analysis functions can be customised to satisfy any particular evaluation requirements. As a basic means an oscilloscope display is provided which allows to view arbitrary intervals of the recorded signals in the time domain.
Two channels can be viewed simultaneously.
Navigation elements allow to navigate through the hours of recorded data and view any particular interval.
By means of search functions particular events or times can be found in the data sets. Dedicated search functions for more complex signal patterns can be implemented in accordance with customer requirements.
Number: 2 (4 optional)
Impedance: 50 Ohms
(1 MOhm optional)
Input Range: 0 - 2.5 V
(+/- 1 V, +/- 2 V, +/- 5 V optional)
Resolution: 8 bit
(10 or 12 bit optional)
up to 5 hours (data reduction off)
up to 120 hours (data reduction on)
Start - Stop
Sample Rate: up to 20 MS/s
Exchangeable High Density Harddisks