An Introduction to RTCG Activities

Report
An Introduction to
R.T.C.G. Activities
Peter Burton
Head of R.T.C.G.
Radiocommunications Agency
RTCG in 2002 and beyond…
Radiotechnology and Compatibility Group
Introduction
Resources
Recent Projects
RAF Kenley
 Originally Aircraft
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Acceptance park in 1917-18
1919 - RAF Kenley
Extensive building 1932-34
Former Officers Mess
Several famous Hurricane
and Spitfire squadrons
stationed here during World
War 2
RAF moved out 1978
Now only gliders
RTCG Whyteleafe
 Refurbished as Type
Approval Laboratory in
1983
 Brought all individual
laboratories together
 As TA testing carried out
by commercial Test
Houses, more opportunity
to do compatibility work
 Now used as RA’s test
facility for compatibility
studies
RTCG’s “Mission Statement”
•
We provide the Agency with a flexible, efficient
and competent investigation facility, providing
technical solutions to allow other RA Business
Units to meet their business needs.
•
Our mission is to maximise RTCG’s value to the
Agency by creating a “centre of excellence
culture”; through technical investigation, to help
the Agency strengthen its international influence
and improve UK radio spectrum utilisation.
What does RTCG do ?
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Acts as internal consultancy for RA
Carries out investigations 9kHz to 140GHz
Laboratory work
Field work
Emulations & simulations
Supports RA in managing spectrum
How do we do this - 1 ?
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We employ 25 staff
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2 x H.P. Frequency Agile Signal Simulators
We carry out approx. 60 projects per year
The site covers an area of 23 acres
Open Area Test Site calibrated for 3m, 10m &
30m operation
Generation of uniform EM fields up to 30V/m
up to 18GHz
How do we do this - 2 ?
•
“ALTA SPW” terminal for simulating radio
systems (UNIX)
•
“ACOLADE” terminal for simulating radio
systems (NT4)
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R.F.Screened room (max 6m x 3.6m)
Semi-Anechoic room (6.5m x 6m)
Mobile Measurement Laboratory
Fully Anechoic Chamber earlier this year
Why does RA need us ?
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Managing the UK spectrum
International issues
Assessing effect of new services
Dealing with difficult interference cases
Keeping abreast of technology
(RA’s “Centre of Excellence”)
How do we relate to other R&D ?
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Part of RA’s commitment to research
RTCG <--> Universities/consultants
Our strengths
Our limitations
Modernisation
 More flexible working arrangement
 “Hot desking”
 New benches suited to modern test
equipment
 Mobile equipment “buggies”
 Disposal of redundant environmental test
equipment
 New staff with specific responsibilities
509 = Impulsive Interference ->
DVB-T
 Assess performance of DVB-T
receivers when subjected to
impulsive interference
 C/H thermostats, car ignition systems
 Simulate the interference waveforms
using FASS
DVB-T Receiver Performance with simulated central heating thermostat
interference for different DVB-T modes
 Manufacturer to use our
25.0
C/I levels for picture failure(dB)
Impulsive Interference model
in testing DVB products
15.0
5.0
-5.0
-15.0
-25.0
-35.0
QPSK
-45.0
1/2
2/3
3/4
16 QAM
5/6
7/8
2K norm
1/2
8K norm
2/3
2K mod
3/4
64 QAM
5/6
8K mod
7/8
1/2
2/3
C/Theory AWGN (QEF ETSI)
3/4
5/6
7/8
537/612 = xDSL and PLT
 Telecommunications Systems
Operating over Material Substances,
aka - ISDN, xDSL and PLT
 O/H drop wires can act as antennas
 Unscreened twisted pair cable
radiates if poorly balanced
 Production/development of
MPT1570 specification
593/627 = Bluetooth Compatibility
 Bluetooth - new global interconnectivity radio interface
 Operates in 2.4GHz band
 Other systems in band  RFID system
 RLANs
 Microwave Ovens
 Results to CEPT SE24
566 = Optically Transparent
RF Absorbing Structures
 Project to design/build RF filters to
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reduce ISM interference
Work carried out in conjunction with
Nottingham Trent University
University build - RTCG measure
Can provide 50dB reduction
May result in new product
565 = Radiated Signals from
Base Stations
 An example of having the answer
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before the question has been asked
Measurements at Base Station sites
3G band (1900 - 1980MHz)
Antenna, filter, measurement
receiver
Results presented to ETSI RP11
Local broadcast VHF FM channels
Multiple base station sites for GSM 900
Multiple base station sites for PCN 1800
Microwave link stations to feed the
above
PMR wide area VHF
PMR wide area UHF
Private VHF paging
Private UHF paging
Emergency Services - fire, police,
ambulance in VHF and UHF
Public Utilities - water, electricity and gas
JRC bands
TETRA services for Dolphin
542 = Baby Alarm
 Complaint from CAA about
Interference to aircraft
 Original Type Approval sample OK
 New Production sample faulty
 Production variations
F r eq u en cy
4 9 .9 0 5 M H z
9 9 .8 0 7 M H z
1 1 6 .4 4 M H z
1 2 4 .9 7 5 M H z
1 3 3 .0 8 M H z
DUT 2
+11 dBm
-1 .5 d B m
DUT 1
+12 dBm
-5 2 .9 d B m
-5 6 .9 d B m
N o em issio n
-6 7 d B m
E R P L im it
+10 dBm
-5 4 d B m
-5 4 d B m
-5 4 d B m
-5 4 d B m
528 = Rewriting ETR 028
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u
ETSI Technical Report
Measurement Uncertainty
Measure 1 microvolt but is it?
Calculation of all the errors
Report now published by ETSI RP02
c measuremen
t

u2
c mismatch
 u2
j signal generator
 u2
j signal generator stability
level
 u2
 u2
j cable loss
j RF level (converted )
www.radio.gov.uk/topics/research/rtcg

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