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ARGOS DOWNLINK

ARGOS DOWNLINK. Christian Ortega, CLS Bill Woodward, Service Argos. THE CURRENT ARGOS SYSTEM. Satellite-based data collection and location system Short message transmission Unidirectional system

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ARGOS DOWNLINK

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  1. ARGOS DOWNLINK Christian Ortega, CLS Bill Woodward, Service Argos

  2. THE CURRENT ARGOS SYSTEM • Satellite-based data collection and location system • Short message transmission • Unidirectional system • Random access system ( no communication protocol) • Simple, cheap and reliable • But,…

  3. …Users cannot communicate with their platform once it is deployed

  4. The ARGOS Space segment NOAA 14 NOAA 15 NOAA - 16 - NOAA 17 Argos 1 Argos 2 Argos 2 Argos 2 Argos 1 - ADEOS II Argos 1 Argos 2+

  5. Evolution of the constellation

  6. 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 0530 C6 C3 NPOESS (A4) (A3) ? 0930 C4 NPOESS C1 NPOESS M1 M2 M3 NOAA METOP Local Equatorial Crossing Time (A3) ? (A3) (A3) (ADEOS 2) 17 1330 (A3) (A3) C5 NPOESS NOAA N 16 C2 N’ POES METOP NPOESS

  7. ARGOS DOWNLINK- Overview • Send Short Messages to PMT Equipped Platforms • Centralized Msg Management - DMMC • Global Coverage

  8. Transmit more data with acknowledgement of satellite (uplink interactive mode) Modify setting of parameters inside platforms via the downlink (ex: diving depth for floats, modification of a sampling period on sensors, modification of sensor acquisition strategies, start or stop acquisition,…) Save energy: possibility to transmit only on satellite passes The Receiver will be considered as a slave plug and play module like any sensor Consequences for users

  9. Logical Unit Platform Messaging Transceiver: PMT Receiver PTT Sensors

  10. PMT Development • Bathy Systems, Inc. • Uses Receiver Built by IESM (France) • Prototypes Available in Late 2003 • Initial Applications : balloons, drifters, floats

  11. Prototype PMT Approx. 6 in.

  12. BENEFITS OF USING ARGOS 2-WAY

  13. Transmit More Data per Satellite Pass • Modify Parameter Settings on Your Platform • Transmit Only on Satellite Pass – Save Power

  14. USING INTERACTIVE MODE • RANDOM ACCESS SYSTEM • No Ground to Sky Protocol • Improve Good Receipt by repeat Xmissions (same msg sent multiple times) • DIFFERENT WITH ARGOS 2-WAY • Error-free msg Receipt is acknowledged • Repeat Transmissions are minimized/eliminated • RESULT = MORE MSGS (DATA per PASS)

  15. USING INTERACTIVE MODE FLOAT EXAMPLE – APEX (Webb Research) • Current “Typical” Transmission Strategy • 4 2/3 Data Triplets (P,T,S) per Argos Msg • 15 Msgs are Req’d to Send a Profile of 71 Levels • Each Msg is Sent Multiple Times at a 45 sec. Rep. Rate • Required Surface Time is 3 to 10+Hours

  16. USING INTERACTIVE MODE 10 Hours 10 Mins FLOAT EXAMPLE – APEX (continued) • Possible Strategy with Argos 2-Way • 4 2/3 Data Triplets (P,T,S) per Argos Msg • 15 Msgs are Req’d to Send a Profile of 71 Levels • Each Msg is Sent until ACK is Received • Use a 30 sec. Rep. Rate, Send 20 msgs in a 10 min. Sat. Pass

  17. USING INTERACTIVE MODE FLOAT EXAMPLE – APEX (continued) • RESULT: AN ENTIRE PROFILE CAN BE SENT IN A SINGLE SATELLITE PASS!

  18. USING USER DEFINED MESSAGES • REMOTELYMODIFY PLATFORM SETTINGS • Parking depth for a float, control of diving cycles, sampling on sensors,... • Modify the transmission strategy (e.g., transmit more data when necessary)

  19. PASS PREDICTION DATA Time (UTC) Thu Sep 25 17:52:57 2003 1 (ADEOS II) AOS Thu Sep 25 18:03:49 2003 in 00:10:52 (00:16:32) Max.El 45 2 ( NOAA 12) AOS Thu Sep 25 22:56:57 2003 in 05:04:00 (00:14:56) Max.El 20 3 ( NOAA 11) AOS Thu Sep 25 19:16:17 2003 in 01:23:20 (00:16:38) Max.El 68 4 ( NOAA 14) AOS Fri Sep 26 00:18:50 2003 in 06:25:53 (00:03:00) Max.El 00 5 ( NOAA 15) AOS Thu Sep 25 23:54:34 2003 in 06:01:37 (00:06:22) Max.El 01 6 ( NOAA 16) AOS Thu Sep 25 20:02:34 2003 in 02:09:37 (00:13:56) Max.El 13 7 ( NOAA 17) AOS Thu Sep 25 18:32:02 2003 in 00:39:05 (00:17:06) Max.El 71

  20. 17 DEMO MESSAGES SENT 00 00 -> FFFE2FF23CCB6AA9480032323232323232323232323232323232323232323232323232323232 01 00 -> FFFE2FF23CCB6A59AE0132323232323232323232323232323232323232323232323232323232 02 00 -> FFFE2FF23CCB6A58A50232323232323232323232323232323232323232323232323232323232 03 00 -> FFFE2FF23CCB6AA8430332323232323232323232323232323232323232323232323232323232 04 00 -> FFFE2FF23CCB6A5AB30432323232323232323232323232323232323232323232323232323232 05 00 -> FFFE2FF23CCB6AAA550532323232323232323232323232323232323232323232323232323232 06 00 -> FFFE2FF23CCB6AAB5E0632323232323232323232323232323232323232323232323232323232 07 00 -> FFFE2FF23CCB6A5BB80732323232323232323232323232323232323232323232323232323232 08 00 -> FFFE2FF23CCB6A5E9F0832323232323232323232323232323232323232323232323232323232 09 00 -> FFFE2FF23CCB6AAE790932323232323232323232323232323232323232323232323232323232 10 00 -> FFFE2FF23CCB6AAF720A32323232323232323232323232323232323232323232323232323232 11 00 -> FFFE2FF23CCB6A5F940B32323232323232323232323232323232323232323232323232323232 12 00 -> FFFE2FF23CCB6AAD640C32323232323232323232323232323232323232323232323232323232 13 00 -> FFFE2FF23CCB6A5D820D32323232323232323232323232323232323232323232323232323232 14 00 -> FFFE2FF23CCB6A5C890E32323232323232323232323232323232323232323232323232323232 15 00 -> FFFE2FF23CCB6AAC6F0F32323232323232323232323232323232323232323232323232323232 16 00 -> FFFE2FF23CCB6A56C71032323232323232323232323232323232323232323232323232323232 17 00 -> FFFE2FF23CCB6A1A62913232323232323232323232323232320D0A0D0AFFFFFFFFFFFFFFFFFF

  21. BEGIN INTERACTIVE SESSION PMT> Thu Sep 25 18:03:51 2003 Satellite: 1 (ADEOS II) is overhead Duration: 00:16:32 Max. El: 45 Sending Request for Interactive RECEIVED: 23CCB6A104000123456789ABCDEFF67D *Interactive Request timed out Sending Request for Interactive *Interactive Request timed out Sending Request for Interactive RECEIVED: 23CCB6A102AE8D01570B *Interactive Session Go-Ahead Message

  22. Send Message IRP 00 -> FFFE2FF23CCB6AA9480032323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A101A94825C4 Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £0 Send Message IRP 01 -> FFFE2FF23CCB6A59AE0132323232323232323232323232323232323232323232323232323232 Send Message IRP 02 -> FFFE2FF23CCB6A58A50232323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A10158A529B7 Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £2 Send Message IRP 03 -> FFFE2FF23CCB6AA8430332323232323232323232323232323232323232323232323232323232 Send Message IRP 04 -> FFFE2FF23CCB6A5AB30432323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A1015AB33D22 Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £4 Send Message IRP 05 -> FFFE2FF23CCB6AAA550532323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A101AA55B30B Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £5 Send Message IRP 06 -> FFFE2FF23CCB6AAB5E0632323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A101AB5E3151 Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £6 Send Message IRP 07 -> FFFE2FF23CCB6A5BB80732323232323232323232323232323232323232323232323232323232 Send Message IRP 08 -> FFFE2FF23CCB6A5E9F0832323232323232323232323232323232323232323232323232323232 RECEIVED: 23CCB6A1015E9F1408 Acknowledgement of an Interactive PMT uplink message within a session. ACK on Message £8

  23. SUMMARY OF SESSION PMT> PMT>stats Bytes Sent : 504 Bytes in Message: 504 Percent Complete: 100

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