DBCP 21 Buenos Aires Argos 3 October 2005 ARGOS 3 – THE NEXT GENERATION Bill Woodward – SAI.

DBCP 21 Buenos Aires Argos 3 October 2005

ARGOS 3 – THE NEXT ARGOS 3 – THE NEXT GENERATIONGENERATION

Bill Woodward – SAIBill Woodward – SAI


TODAY’S PRESENTATIONTODAY’S PRESENTATION

► SYSTEM FEATURES AND CAPABILITIESSYSTEM FEATURES AND CAPABILITIES

► HOW THEY CAN BE APPLIED - ExamplesHOW THEY CAN BE APPLIED - Examples

► LAUNCH SCHEDULE & PLANNEDLAUNCH SCHEDULE & PLANNED CONSTELLATION CONSTELLATION

► FUTURE (ARGOS 4)FUTURE (ARGOS 4)


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Argos provides communications for all systems with theArgos provides communications for all systems with the


TODAY’S ARGOS SPACE SEGMENTTODAY’S ARGOS SPACE SEGMENT

NOAA 12(1991)

NOAA 14(1994)

NOAA 15 NOAA 16 NOAA 17

NOAA 18(2005)

ARGOS 1ARGOS 1

ARGOS 2ARGOS 2

ARGOS 2ARGOS 2

METOP A

(April 2006)

ARGOS 3

ARGOS 3

(1998) (2000) (2002)


ARGOS SYSTEM EVOLUTIONARGOS SYSTEM EVOLUTION

RANDOM ACCESS SYSTEM: ARGOS RANDOM ACCESS SYSTEM: ARGOS 1 & 21 & 2 No Ground to Sky ProtocolNo Ground to Sky Protocol

Improve Good Receipt by repeat Improve Good Receipt by repeat transmissions (same msg sent multiple transmissions (same msg sent multiple times)times) DIFFERENT WITH ARGOS 3DIFFERENT WITH ARGOS 3 Error-free msg Receipt is Error-free msg Receipt is acknowledgedacknowledged Repeat Transmissions are Repeat Transmissions are minimized/eliminatedminimized/eliminated

RESULT = MORE MSGS (DATA per RESULT = MORE MSGS (DATA per PASS)PASS)

Order of Magnitude Higher Data Rate: 4,800 bits/secOrder of Magnitude Higher Data Rate: 4,800 bits/sec


400 bits per second

4 channels

-128 dBm

20 kHz receiver bandwidth

400 bits per second

8 channels

-131 dBm


400 & 4800 bits per second

12 channels

-137 dBm


2- way communication

SYSTEM GENERATIONSSYSTEM GENERATIONS

ARGOS 1

ARGOS 2

ARGOS 3


ARGOS 3 FEATURESARGOS 3 FEATURES

♥ HIGH DATA (HD) RATE CHANNEL - 4,800 BITS/SECHIGH DATA (HD) RATE CHANNEL - 4,800 BITS/SEC

♥ TWO-WAY CAPABILITY –Send Msgs and ACKTWO-WAY CAPABILITY –Send Msgs and ACK

♥ HIGHER RCVR SENSITIVITY – MINUS 137dBmHIGHER RCVR SENSITIVITY – MINUS 137dBm

♥ WIDER SPECTRUM: +30 KHz FOR HIGH DATA RATEWIDER SPECTRUM: +30 KHz FOR HIGH DATA RATE

♥ 12 PROCESSING UNITS12 PROCESSING UNITS

♥ NEW TRANSMITTER MODULATIONNEW TRANSMITTER MODULATION


The ARGOS-3 System

UPLINK : 3 transmission protocols @ 401 MHz

– Standard : 400 bps, basic Argos ServiceSTD Argos-1, 2 and 3

– High Sensitivity : 400 bps, very low powerNG additional 5 dB margin

– High Data Rate : 4.8 kbps, 5 WattHD up to 50 kbits per pass


DOWNLINK : transmit messages @ 466 MHz of variable length (~ 200 bits max) to the Platforms fitted with appropriate receivers

The ARGOS-3 System


The ARGOS-3 Receiving Spectrum

80 kHz30 kHz

24 kHz

401.610 MHz 401.690 MHz401.580 MHz

401.638 MHz

401.662 MHz


• Beacon equipped with a receiver = PMT Beacon equipped with a receiver = PMT (466 MHz, 400 bps, half or full duplex)(466 MHz, 400 bps, half or full duplex)

• Main functionalities :Main functionalities :– Acknowledgement of uplink messages Acknowledgement of uplink messages – Transmission of user defined PMT instructions Transmission of user defined PMT instructions (can (can

selectively address one or more PMT’sselectively address one or more PMT’s))– « Allcast » msgs « Allcast » msgs (Time broadcasting, orbital parameters….)(Time broadcasting, orbital parameters….)

– Transmission of pre-defined msgs Transmission of pre-defined msgs (On, off, PMT (On, off, PMT location….)location….)

The ARGOS-3 DownlinkThe ARGOS-3 Downlink


• NEW LINK BETWEEN SENSORS & USERSNEW LINK BETWEEN SENSORS & USERS

• PLATFORM MESSAGING TRANSCEIVERPLATFORM MESSAGING TRANSCEIVER

- UPLINK MESSAGES w/SELECTED MODULATIONUPLINK MESSAGES w/SELECTED MODULATION

- RECEIVE DOWNLINK MESSAGES- RECEIVE DOWNLINK MESSAGES

- COMMUNICATE w/PLATFORM; DELIVER ACK- COMMUNICATE w/PLATFORM; DELIVER ACK

• NEW ARGOS PERFORMANCE TO USERSNEW ARGOS PERFORMANCE TO USERS

The ARGOS-3 PMTThe ARGOS-3 PMT


FIRST GENERATION PMTFIRST GENERATION PMT

““MODULAR”MODULAR”

SECOND GENERATION PMTSECOND GENERATION PMT

““SINGLE BOARD”SINGLE BOARD”

CLS PMT PROJECT: 2 MAIN TARGETSCLS PMT PROJECT: 2 MAIN TARGETS


80 FIRST GEN UNITS: PMT A2/HD – 80 FIRST GEN UNITS: PMT A2/HD – to to be built by Seimac, Ltdbe built by Seimac, Ltd

“ “ALMOST” EXACT COPIES OF PROTOTYPESALMOST” EXACT COPIES OF PROTOTYPES BUILT BY BATHY SYSTEMS - Modular BUILT BY BATHY SYSTEMS - Modular

IMPROVEMENTS INCLUDE:IMPROVEMENTS INCLUDE:

• New Digital Xmtr for both BPSK & GMSKNew Digital Xmtr for both BPSK & GMSK

• New Packaging - smaller sizeNew Packaging - smaller size

FIRST 10 UNITS TO BE DELIVERED – DEC. ‘05FIRST 10 UNITS TO BE DELIVERED – DEC. ‘05


SECOND GENERATION PMTSECOND GENERATION PMT

CORRESPOND FUNCTIONALLY TO DEMOCORRESPOND FUNCTIONALLY TO DEMO UNITS BUT DESIGNED FROM “SCRATCH” UNITS BUT DESIGNED FROM “SCRATCH”

SINGLE BOARD REDUCES SIZE, COST,SINGLE BOARD REDUCES SIZE, COST, COMPLEXITY AND POWER CONSUMPTION COMPLEXITY AND POWER CONSUMPTION

BENEFIT FROM EXISTING KNOWLEDGE &BENEFIT FROM EXISTING KNOWLEDGE & EXPERIENCE OF COSPAS/SARSAT EXPERIENCE OF COSPAS/SARSAT MANUFACTURERS MANUFACTURERS


THREE PRINCIPAL THREE PRINCIPAL REQUIREMENTSREQUIREMENTS

Transmit More Data FasterTransmit More Data Faster

Shorter Surface TimeShorter Surface Time

Survive Longer/Use Less Survive Longer/Use Less PowerPower

CASE STUDY - ARGO

http://www-hrx.ucsd.edu/www-argo/statusbig.gif


APPLYING ARGOS 3 FEATURESAPPLYING ARGOS 3 FEATURES

PROFILING FLOATPROFILING FLOAT

► Surface Time Decrease: 10+ Hours 10 minutesSurface Time Decrease: 10+ Hours 10 minutes

► Float Lifetime Extended: Xmit Only During Sat. PassFloat Lifetime Extended: Xmit Only During Sat. Pass and use Lower Power XMTR and use Lower Power XMTR

► Send Complete Send Complete 70 Level Profile70 Level Profile in One Argos Message in One Argos Message!!

► Send Send 800 Level Profile800 Level Profile in One Satellite Pass in One Satellite Pass!!

► Adaptive control using 2-wayAdaptive control using 2-way

CASE STUDY - ARGO


EXAMPLE – APEX (Webb EXAMPLE – APEX (Webb Research)Research) Current “Typical” Transmission Current “Typical” Transmission

StrategyStrategy using Argos 2 using Argos 2 5 Data Triplets (P,T,S) = 240 Bits5 Data Triplets (P,T,S) = 240 Bits

15 Msgs are Req’d to Code a Profile of 75 15 Msgs are Req’d to Code a Profile of 75 Levels:Levels: (3.7 kbits) (3.7 kbits) Each Msg is Sent 5+ Times at a 45-60 sec. Each Msg is Sent 5+ Times at a 45-60 sec. Rep. RateRep. Rate Required Surface Time is 10+ HoursRequired Surface Time is 10+ Hours

CASE STUDY - ARGO


APPLY ARGOS 3 HD +ACKHD +ACK STRATEGY

Xmit Only When Satellite is in Xmit Only When Satellite is in View – View – Rendezvous Rendezvous Xmit using High Data Rate withXmit using High Data Rate with Acknowledgement Signal Acknowledgement Signal

CASE STUDY - ARGO


EXAMPLE 1 – APEX FLOATEXAMPLE 1 – APEX FLOAT

SEND SEND 75 LEVEL75 LEVEL PROFILE IN A SINGLE MSG PROFILE IN A SINGLE MSG

75 Data Triplets (P,T,S) = 3,600 Bits75 Data Triplets (P,T,S) = 3,600 Bits

Only 1 Msg is Req’d to Code a Profile of Only 1 Msg is Req’d to Code a Profile of 75 Levels75 Levels Msg is Sent until ACK is ReceivedMsg is Sent until ACK is Received

Can use a 60 sec. Rep. Rate, and send 10 Can use a 60 sec. Rep. Rate, and send 10 msgs in a msgs in a 10 min Sat Pass 10 min Sat Pass

CASE STUDY - ARGO


EXAMPLE 2 – APEX FLOATEXAMPLE 2 – APEX FLOAT

SEND SEND 800 LEVEL800 LEVEL PROFILE IN ONE PASS PROFILE IN ONE PASS

100 Data Triplets (P,T,S) = 4,800 Bits100 Data Triplets (P,T,S) = 4,800 Bits

8 Msgs are Req’d to Code a Profile of 8 Msgs are Req’d to Code a Profile of 800 800 LevelsLevels Each Msg is Sent until ACK is Received Each Msg is Sent until ACK is Received

Can use a 50 sec. (or less) Rep. Rate, and Can use a 50 sec. (or less) Rep. Rate, and send 11send 11 msgs in a 10 min Sat Pass msgs in a 10 min Sat Pass

CASE STUDY - ARGO


Argos 2

+ 2-way

Argos 3

+ 2-way

+ 2-way

Kbits Kbits

perper

SatSat

PassPass

80 points80 points 554 points554 points 800 800 pointspoints

3838

2727

11

22

ARGOS DATA TRANSFER FOR ARGOARGOS DATA TRANSFER FOR ARGO

ONE ARGOS 3 MSG


APPLYING THE NEW FEATURESAPPLYING THE NEW FEATURES

DRIFTERDRIFTER

► Drifter Lifetime ExtendedDrifter Lifetime Extended

XMIT only whenXMIT only when triggered triggered

XMIT only when satellite is overhead XMIT only when satellite is overhead

► Send More/Different DataSend More/Different Data

► Lower Power XMTR – Shift FrequencyLower Power XMTR – Shift Frequency

http://www.aoml.noaa.gov/phod/dac/gdc.html


POSSIBLE CNES MICROSAT POSSIBLE CNES MICROSAT

MEGA-TROPIQUE –EQUATORIAL ORBITMEGA-TROPIQUE –EQUATORIAL ORBIT

LAUNCH SCHEDULELAUNCH SCHEDULE


The future : ARGOS-4

FOR STANDARD BEACONS :FOR STANDARD BEACONS :

- - Continuity of mission to be ensured : use of current modulations Continuity of mission to be ensured : use of current modulations (standard and new generation).(standard and new generation).- Improvement of the capacity by increasing the band (today 80 kHz Improvement of the capacity by increasing the band (today 80 kHz →→ 2 MHz useable in the 401-403 MHz band) and/or the number of 2 MHz useable in the 401-403 MHz band) and/or the number of processing units.processing units.- Improvement of techno, of DSP processing power.Improvement of techno, of DSP processing power.

FOR HIGH DATA RATE BEACONS :FOR HIGH DATA RATE BEACONS :- Bit rate up to 10 or 20 kbits/s with same EIRP = 5 Watt (use of last Bit rate up to 10 or 20 kbits/s with same EIRP = 5 Watt (use of last modulation and coding techniques : treillis coded modulation or modulation and coding techniques : treillis coded modulation or turbo coding for instance)turbo coding for instance)- Capacity enhancement by use of spread spectrum techniques for Capacity enhancement by use of spread spectrum techniques for instanceinstance


Improvement of the DownlinkImprovement of the Downlink : :

Currently, the downlink is limited to one single frequency Currently, the downlink is limited to one single frequency @ 465.9875 MHz and a bit rate = 400 bps.@ 465.9875 MHz and a bit rate = 400 bps.

For Argos-4, due to the uplink capacity improvement and For Argos-4, due to the uplink capacity improvement and the need of more acknowledgements, the downlink will the need of more acknowledgements, the downlink will certainly need to be improved:certainly need to be improved:

- - by adding other frequency channelsby adding other frequency channels

- by increasing the data bit rate- by increasing the data bit rate

- by using new modulation and coding techniques- by using new modulation and coding techniques

The future : ARGOS-4

DBCP 21 Buenos Aires Argos 3 October 2005 ARGOS 3 – THE NEXT GENERATION Bill Woodward – SAI.

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Transcript of DBCP 21 Buenos Aires Argos 3 October 2005 ARGOS 3 – THE NEXT GENERATION Bill Woodward – SAI.