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CIMS Digital Recording & Analysis System

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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.

Capabilities

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.

Input Signals

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)

Recording

Duration:
up to 5 hours (data reduction off)
up to 120 hours (data reduction on)
Methods:
Continuous
Start - Stop
Ring-Buffer
Sample Rate: up to 20 MS/s
Storage Medium:
Exchangeable High Density Harddisks

CIMS E&S staff acted as the technical secretary and editor for the following Minimum Operational Performance Specifications (MOPS) which are produced in working groups of the EUROCAE.

EUROCAE Minimum Operational Performance Specification for Secondary Surveillance Radar Mode S Transponders (ED-73A)
EUROCAE Minimum Operational Performance Specification for Mode S Aircraft Data Link Processors (ED-82A)
EUROCAE Equipment Characteristics for Mode S Transponders with extended Interface Functions, Mark 4 Transponder (ED-86)
EUROCAE Minimum Operational Performance Specification for Mode S Specific Service Applications Dataflash (ED-101)

This work involved monitoring and understanding the related ICAO Standards and Recommended Practices (SARPs), so giving CIMS Engineering & Systems GmbH an in-depth knowledge of the Avionics Standards for communication.

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Universal Data Decoder

The CIMS Universal Data Decoder (UDD) is a tool for decoding arbitrary data streams. It was initially developed as a support tool for testing activities and as an aid in the analysis of the data exchanged between Avionics Equipment.
It is now available as a stand-alone tool.

A commonly known problem for test- and development engineers is that technical data exchanged on subsystem nterfaces requires laborious manual decoding to determine its correctness.

The UDD consists of a core decoding engine with universal decoding functions. The description of a particular encoding scheme is loaded as a separate decoding module. This decoding module is derived directly from the definition of the data encoding scheme of a given protocol (e.g. from ISO8208 packet definitions) and represented in a structured text format. The use of loadable decoding modules removes the need to develop dedicated decoding software for each particular protocol and thus eases the introduction of a new protocol or protocol changes. As an example: the decoding module for X.25 was created in only 1 day.

Captured data may be read from files or originate directly from physical interfaces. Specific interface modules can be developed if required. An ARINC 429 interface is available for the direct capture and display of data.

A particular feature of the UDD is that it decodes not only data streams at interfaces but also memory dumps containing structured data, so facilitating software development and trouble-shooting.

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