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Boston University Daniel Taylor Nima Badizadegan R. Terry Black Pantelis Thomadis

Boston University Daniel Taylor Nima Badizadegan R. Terry Black Pantelis Thomadis. Mission 1: Communications. Determine packet loss in near-space environment Measuring rate of packet loss at varying altitudes Proof of concept for status beacon

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Boston University Daniel Taylor Nima Badizadegan R. Terry Black Pantelis Thomadis

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  1. Boston University Daniel Taylor Nima Badizadegan R. Terry Black Pantelis Thomadis

  2. Mission 1: Communications • Determine packet loss in near-space environment • Measuring rate of packet loss at varying altitudes • Proof of concept for status beacon • Status beacon will begin when BUSAT is launched, contains vital status information • Important part of communications system

  3. Testing magnetometer in different thermal environments Determine three orthogonal magnetic field vectors Determine how well the magnetometer will work near radio and power systems Large source of interference Mission 2: Magnetometer

  4. SHOT II / UN-7 Connection • Communications system test • Packet loss • Near space environment • Proof of concept for beacon • Magnetometer • Thermal testing • Stored data can be used for calibration in the future • Same setup as on BUSAT

  5. SHOT II Design – Block Diagram

  6. SHOT II Design – Software • No software needed for radio • Beacon set up automatically • Microcontroller software: • Read data from Magnetometer every 42 seconds • Data stored in EEPROM (512 bytes total) • 113 data points per axis

  7. SHOT II Design – Mechanical

  8. SHOT II Test Procedure • Chase balloon around with handheld Yagi antenna • Receive and record any packets received from the beacon, can be checked for error rate • Magnetometer records data automatically • One sample every 62 sec • EEPROM can be read when the payload is recovered

  9. Expected Data • Magnetometer: 113 data points for each axis • Data comparable to IGRF data • Should indicate that magnetometer correctly reads magnetic field (with error) over large temperature range • Communications: packet loss data • Able to decode and read packets on the ground • Low packet loss (75% received)

  10. Test Results • Structural Tests • Payload survived all tests with minimal damage • Functional Tests • Testing completed with expected results • Successfully retrieved magnetometer data • Communications received 80% of packets transmitted

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