Transcript A High Performance 25kW Three-Phase PFC Power Supply for

1st COROT Workshop – Natal – RN – Brazil
Low Cost Multimission
Telecommand and Telemetry
Natal Ground Station
(TT&C)
by Jean Paul DUBUT (INPE/CRN)
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1st COROT Workshop
INPE Ground Station Segment
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TT&C Natal Ground Station Concept
Microsatellite
Minisatellite
- COROT
- PROTEUS
- EQUARS
© CNES / illustration
© CNES / illustration David Ducros
-SCD´s
- CBERS
Multimission TT&C
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TT&C General Information
Manufacturer: ELTA
Low cost: US$ 1,200,000.00
Site installation:
 INPE/CRN
 Natal, RN, Brazil
Covering area: northeast and Equatorial Atlantic
Geographic coordinates
 Latitude: 05º 50’ 10,06” S
 Longitude: 35º 12’ 27,34” W
 Altitude: 56,25 m
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TT&C Implementation Schedule
Start: June 2004;
Kick-off meeting: July 2004;
CDR: end of November 2004;
Factory acceptance tests: June 2005;
On site installation and acceptance tests: October
2005;
Operation and maintenance training: October 2005.
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TT&C Technical Specifications
S-Band: - TC from 2025 to 2120 MHz
- TM from 2200 to 2300 MHz
EIRP > 50 dBW in whole bandwidth
G/T > 10 dBK in whole bandwidth
TM Flux : > -155 dBW/m2 (25Kbits/s)
> -140 dBW/m2 (750Kbits/s)
Techno losses < 2 dB
Acquisition threshold : Eb/N0 > 6 dB
Tracking threshold : Eb/N0 > 5.5 dB
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TT&C Technical Specifications
Telecommand data rate : Up to 20 kbit/s
Protocol: CCSDS
Telemetry data rate : between 25 kbit/s and 1 Mbit/s
Protocol: CCSDS
Ranging rate: better than 1Hz  0,1ms relative to UTC
Time code format: IRIG-B
Communication interface: LAN (TCP/IP/Ethernet)
Antenna diameter: 3 meters
Antenna pointing resolution: better than  0.2º
MTBF:  1000 hours
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TT&C Automatic and Remote Functions
Remote
Operation
Pass Planning
File Sent by CCC
Automatic
Operation
Pass
Preparation
Pass - 5min
Reading of TM in
real time by CCC
Reading of TM
after pass by CCC
Pass
Management
Pass Closure
Next Pass
Preparation
Time
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Ground Segment Interfaces
PI's
OBCT
SSET
F
T
P
/
W
E
B
F
T
P
FTP
WEB
PCS
F
T
P
SCS
FTP
T
C
P/
I
P
F
T
P
AITT
F
T
P
F
T
P
GSTS-DC
GSTS-SSC
F
T
P
Ground Segment
CCSDS
DCC
Satellite
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TT&C Modular Conception
Level 3 : Complete Station
with S band interface and antenna
Level 2: Kit
with 70 Mhz interface to be
connected to external antenna
Level 1 : Test tool
For Integration
activity
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TT&C Easy Maintenance Concept
MODULAR CONCEPTION
FOR
EASY MAINTENANCE
SET OF SPARES
FOR
HIGH AVAILABILITY RATE
SET OF
PREVENTIVE MAINTENANCE
PROCEDURES
SET OF
CORRECTIVE MAINTENANCE
PROCEDURES
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TT&C Building
Antenna
Radome
Building
interface
Bays
Building
Station fully compatible with any external wheather
conditions (wind, snow, rain, temperature, humidity)
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Photos about Station
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TT&C Architecture
LNA
Down
Converter
Rx QPSK
Demodulator
Diversity
Combiner
Rx SHF
RHCP
LNA
Down
Converter
Bit
Synchro.
Viterbi
Decoder
CCSDS
Decoder
Rx QPSK
Demodulator
Antenna
Control Rack
Rx VIDEO
TERMINAL
CPU
Antenna
CPU
LAN/WAN
LHCP
CONTROL
RHCP
HPA
80 Watts
CCSDS
Encoder
Time
IRIG-B or
RS-232
Tx VIDEO
1 pps
Tx SHF
10 MHz
LHCP
LHCP
PM-PSK or
QPSK
Modulator
Up
Converter
Time/Frequency
Unit
GPS
Receiver
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Sweeping and Doppler Compensation
Received
Frequency
Time
S Band
Frequency
+/- 60 kHz
Generated
Frequency
Time
Pure Carrier Sweeping
Acquisition Process
Doppler Compensation
for Constant Received Frequency
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Distance System Measurement
Telecommand
with Synchro message
Delay 3
Telemetry
with frame header
Delay 1
1ms Datation
Distance = f ( delay1 , delay2 , delay 3 )
Delay 2
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TT&C Autonomous Orbit Determination
Telemetry
Received
Frequency
Time
Orbital parameters
=
f ( Frequency Profile )
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TT&C Software Auto-tracking
Tracking
with
Orbital Parameters
Orbital parameters
From Previous Pass
Antenna Pointed
to Waiting Direction
Accurate
Synchronisation
on the Orbit
Received
Power within
Main Antenna Lobe
Time
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Main Highlights
MODULAR CONCEPTION
For MULTIMISSION
OPERATION
AUTOMATIC & REMOTE
FUNCTIONS
HIGH
PERFORMANCE for MULTIMISION
EASY
MAINTENANCE
COMPATIBLE WITH
ANY WEATHER
CONDITIONS
SIGNIFICANT
HERITAGE &
QUALIFICATION
ON-GOING
IMPROVEMENTS
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Link and Contacts
www.crn2.inpe.br
Phone: ++ 55 84 231 4733
Fax:
++ 55 84 231 4941
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