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Heiko Krtzel, Flight Test Instrumentation, Manching
21.03.2013
Flight Test - Datalink Applications

2 2013 CASSIDIAN - All rights reserved Page
Heiko Krtzel
21.03.2013
Content
Introduction Flight Test Instrumentation Telemetry Data payload for Flight Testing
Overview about test aircraft in Manching
Current Telemetry Applications Requirements System Design (onboard onground)
Future Telemetry Applications downlink
uplink

Heiko Krtzel
21.03.2013
Introduction Flight Test Instrumentation Telemetry
Primary data payload provided by distributed data acquisition system
different kind of data sources: A/C bus data (e.g. 1553 Milbus, EFABUS, FCS, ARINC429, RS422, etc.) A/C system tappings (e.g. Power Supply Voltages, Wheel Speed transducer o/p, etc.) FTI Sensors (e.g. pressure, DMS, temperatures, accelerometers, vibrations, positions, etc.) GNSS Data Audio (e.g. crew speech, system warnings, missle tones) FTI internal housekeeping parameters
continuous serialized datastream: PCM as physical layer, up to 1,3Mbit/s

Heiko Krtzel
21.03.2013
Secondary data payload video
provided by FTI cameras and A/C System (e.g. Display o/p) 2-6 videos for telemetry, in SD resolution but reduced framerate
physical layer analog video: PAL composite, multiplexed, 6MHz BW digital video: PCM with H.264 TS packets incl. audio, 4Mbit/s (4 videos)

Heiko Krtzel
21.03.2013
Tornado instrumented aircraft GS062, GS177, GS217 each 2x 1,3Mbit/s data 1x 6MHz video
Eurofighter/Typhoon instrumented aircraft IPA3, IPA7, IPA8 each 2x 1,3Mbit/s data 2x 4Mbit/s video

Heiko Krtzel
21.03.2013
UAV instrumented aircraft Barracuda 2x 1,3Mbit/s data 2x 6MHz video

Heiko Krtzel
21.03.2013
Current Telemetry Applications
Main User Requirements flexible selection of data set to be transmitted
link stability / data availability delay from measurement till visualisation
coverage of main test areas in southern part of Germany
simultaneous operation of test aircraft possibility to relay data
compatibility to other test ranges
Main Non-User Requirements spectrum allocation
aircraft integration
costs special demands (e.g. encryption)

Heiko Krtzel
21.03.2013
Kartendaten 2013 GeoBasis-DE/BKG ( 2009), Google

Heiko Krtzel
21.03.2013
Onboard System Design separate telemetry links for data and video
frequency diversity for both links true FM modulation
40dBm RF output each (automatic 3dB reduction as heat protection)
~50MHz BW spectrum allocations within S-Band 2290-2500MHz center frequency tunable on aircraft

Heiko Krtzel
21.03.2013
Onground System Design one main primary receiving directional antenna, 26dBi gain, alpha/beta tracker
several secondary receiving antennas (directional / omnidirectional) four receivers / data processing frontends (decryption / PCM decom / video)
data distribution via Gigabit Ethernet network into 3 Quicklook rooms
backup data recording / postflight data replay possibility to connect with WTD61 ground station equipment
mobile ground station for remote campaigns
data connection via ISDN channel grouping (24+2 ch.)

Heiko Krtzel
21.03.2013
Current Telemetry ApplicationsKartendaten 2013 GeoBasis-DE/BKG ( 2009), Google
1500m3000m5000m
AoVRx Antenna

Heiko Krtzel
21.03.2013
Future Telemetry Applications - Overview
Downlink move from S-Band to C-Band (5091 - 5250 MHz)
digital modulation to reduce spectrum allocation Ethernet over air
usage of aircraft system links to transport flight test instrumentation data
Uplink control FTI system within UAV testing (e.g. Flutter excitation)
FTI datalinks between several aircraft segments (air, ground, rig segments) special demands for uplinks to support technology projects (e.g. DODfast)

Heiko Krtzel
21.03.2013
Future Telemetry Applications - Downlink
Move from S-Band to C-Band (5091 - 5250 MHz) in Germany no fix date for change
change expected not before 2017 change in other european countries imminent (e.g. France -> Airbus, Eurocopter)
preparation work at Cassidian ongoing (e.g. Motor Glider as C-Band test bed)

Heiko Krtzel
21.03.2013
Digital Modulation
in case of mandatory bandwidth reduction
SOQPSK favourite in US test ranges part of IRIG-106 specification (along with FM) suitable products available on market
COFDM with QAM seen as a candidate in the past (e.g. Airbus France telemetry) several tests in Manching performed
performance multipath time delay available products (size and costs)

Heiko Krtzel
21.03.2013
COFDM ground testlink stablelink unstablelink loss

Heiko Krtzel
21.03.2013
Ethernet over air driven by the technology change in onboard data acquisition world
LAN on A/C and on ground full duplex but isolated by router/switch development of a test system initiiated at a supplier
RF link unidirectional and relatively slow (2-5 Mbit/s) UDP traffic only, no address learning, unidirectional adressing: multicast MAC address all packets directed to the Ethernet-over-Air system will be queued for transmission Line speed fully independent of the Ethernet MII (Media Independent Interface) clock speed
UAV LAN
UHF-EthernetRadio - TX
Router
Ground Station LAN
UFH-EthernetRadio - RX
Router
Data Recorder
Controller
UDP-Frames
Data Analyzer
Mass Storage

Heiko Krtzel
21.03.2013
FTI Data as payload on aircraft system datalinks very cost effective approach
suitable for low budget projects interface FTI aircraft system downlink: Ethernet
port filtering, addressing, adapted to aircraft system input e.g. to block additional Ethernet service frames, like PTP to predict and limit the FTI payload bandwidth
Example: ATLANTE UAV, Cassidian Spain, first flight 28th. Feb. 2013

Heiko Krtzel
21.03.2013
Future Telemetry Applications - Uplink
Control FTI system within UAV testing stearing of flutter exciter system
high safety requirements redundancy high reliability saftety abort criterias (manual / automatic)
current design dual redundant UHF data uplinks (max. 100kbit/s) link budget design 200km transmission of high level commands only with RS422/RS232 interface best source selection onboard via voter algorithm alternative abort via normal aircraft uplink possible
FTI datalinks between several aircraft segments we assume increasing number of segments belonging to an aircraft under test at least air segment and ground segment
additional segments like rig or second UAV as sensor/shooter

Heiko Krtzel
21.03.2013
Future Telemetry Applications - Uplink
DODFast project support delivery of an UHF uplink system to control DODFast payload
DODFast hardware integrated into ADT-Pod carried by TORNADO aircraft 9.6kbaud RS232 interface for DODFast input (on ground) and output (on aircraft)
a second output (on aircraft) for monitoring and retransmitting to ground
DODFastgroundsegment
EncoderGround
BitsyncDECOM
PCM100 kBit/s
Up-LinkInterfaceData //
DODFastairsegment
RS2329,6 kBaud
UplinkTX
UplinkRX
RS2329,6 kBaud
Ground
Down-LinkInterface
RS23238,4 kBaud
Status
ADT-Pod / Tornado

Heiko Krtzel
21.03.2013
The reproduction, distribution and utilization of this document as well as the communication of its contents to others without express authorization is prohibited. Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or design.
Questions?
Heiko KrtzelFlight Test Instrumentation - Dept. COETO2 Rechliner Strae, 85077 Manching, GERMANY
Tel: ++49 (0)8459 81

flight test - datalink · pdf fileflight test - datalink applications ... (e.g. fran ce ->...

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