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Chapter 10 Telemetry Downlink

This presentation provides an overview of Chapter 10 telemetry downlink methods, including the new asynchronous packet downlink airborne method. It also covers the packet format, filter possibilities, and the current architectures for airborne systems. Additionally, it discusses low latency data handling and the benefits of using Chapter 10 telemetry for HD recording and SD video downlink.

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Chapter 10 Telemetry Downlink

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  1. Chapter 10 Telemetry Downlink Zodiac Data Systems

  2. Presentation overview Topics: • Telemetry downlink methods today • The new chapter 10 asynchronous packet downlink airborne method • Chapter 10 telemetry downlink packet format • Telemetry downlink filter possibilities • The ground segment

  3. Telemetry Downlink Methods Today • Most Telemetry today utilizes IRIG 106, Class I or II, Chapter 4 PCM stream formats • Tedious job periodic sampling of asynchronous data and placing it into PCM Stream • It can be challenging and requires extensive testing • Repeated samples • Often requires excess bandwidth to insure data is not missed

  4. Current Airborne System Architectures • Recorders • Recorders are typically used for capturing bus communications, video (HD/SD), high rate analog and output from FTI Encoders, buses (Total Data Capture). • Recording standard is in IRIG106 Chapter 10 Format • Encoders • Typically capturing transducers and selected data from busses for insertion into Time Division Multiplexed PCM Data Streams • Trend: Network output from Telemetry Encoders

  5. Current Airborne System Architecture Recorder Total Capture 1553 Video High Speed Analog Asynchronous Serial Ethernet Parallel/Discrete Chapter 10 Recording Time Division Muxed 1553 Video Low Speed Analog Parallel/Discrete Other Data Types PCM IRIG Ch4 Transmitter Antenna Encoder Encryptor • Recorder used for Post mission all data analysis • Encoder primarily used for Real Time TM Downlink, Analog sampling • Duplicate Interfaces for Recorder and Encoder !

  6. Chapter 10 Asynchronous Packet Downlink Airborne Scenario Quick-look and real-time monitoring 1553 Video High Speed Analog Asynchronous Serial Ethernet Parallel/Discrete Chapter 10 Recording Recorder IRIG106 Ch10 packets inserted into a constant rate PCM Ch4 stream PCM or Ethernet Transmitter Encoders Antenna Analog Discrete Encryptor Duplicate interfaces not required !

  7. Interface Module Creates Class II PCM stream with IRIG 106 Ch10 Packets Quick-look and real-time monitoring Traditional Chapter 4 PCM TM downlink UDP Selected Ch10 packets from any recorder data types Transmitter Constant Bit Rate PCM Stream with self-correcting code (Ch10 TMDL) UDP data stream (e.g. IP cameras) or other Video sources Antenna

  8. Multiplexing Packets into a Single Fixed Bit Rate PCM Steam Ch10 1553 Packet Ch 2 Ch10 Video Packet Ch 1 Fill Packet, Status Information Ch10 TMDL does not require any programming assignment of data in the Ch4 PCM stream typically required for Encoders

  9. TM Downlink Format First Header Pointer Header Frame Sync Word Frame Sync Word Fill Ch10 Packet Ch10 Packet Minor Frame (IRIG106 Standard Class II)

  10. Low Latency Data Handling • Low Latency Packet mechanism helps inserting time critical data anywhere into the stream • Latency can be kept below 20ms for critical data • Typically 100 ms latency for non priority data FS FS FS Low Latency Data Pck #N Pck #N Pck #N LL FS Pck #N Transfer packets may overlap transfer frames

  11. Aircraft Data Sources: Ch10 TMDL PCM Down Link Stream: PCM (selected words) MIL-STD-1553 (selected messages) ARINC-429 (selected Labels) Ethernet (selected messages or data words) Video (SD compressed or rate decimated HD) Bandwidth limited analog PCM (complete minor frames) MIL-STD-1553 (total bus) ARINC-429 (All labels) Ethernet (All messages) HD video (compressed) High bandwidth analog Lower Rate TM Downlink Filtering for Specific Data Types

  12. PCM Filter Word Selection Status display will show the new data rate

  13. Video Bit Rate DecimationMultiple Rate Compression HD High Bit Rate H.264 Video Ch10 Recording On-Board Video Camera HD Video Interface On Board High Rate Streaming Frame Rate Decimation and / or HD to SD conversion Packet Ch10 TMDL Interface Low Rate PCM TM Downlink

  14. Downlink of Filtered 1553 Data All 1553 Message Ch10 Recording MIL-1553 Interface Packet Ch 1 Packet Ch 1 Packet Ch 1 UDP Broadcast of All Bus Data (or Filtered, if selected so) BC RT Selected 1553 Message Packets Packet Ch10 TMDL Interface Filtered Ch 1 Filtered Ch 1 FilteredCh 1 Selected Messages Fixed Bit Rate PCM

  15. Airborne Processing Channel Concept PCM Stream Matrix Switch Filter 2 3 Filter 1 2 All Data 1 Recording 1 Recording 2 UDP 2 TM Down 1 TM Down 2 UDP 1 Destinations

  16. Generic Air and Ground Diagram Quick-look and real-time monitoring: Network Data (e.g. IP cameras) And other Video sources Other Network data processing IRIG106 Ch10 UDP broadcast Ch4 PCM Ch10 TMDL stream Antenna Ch4 PCM output PCMs from encoders Direct Video analysis

  17. ZDS Ch10 TMDL Components

  18. Ch10 TM Downlink Summary • Totally compatible with TM encryptor, decryptor, transmitters, receivers, bit syncs • Switching cost is low • Ch10 Telemetry greatly simplify TM downlink process • Minimal testing required to setup mission • Ideal for HD recording and SD Video downlink • Low latency is achievable

  19. Thank you !

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