HA1L High Altitude 1U Laboratory University of Michigan Tom Heine Ted Lorts Hrishikesh Shelar

Mission Overview: HA1L’s mission is to serve as a test of Michigan’s next core CubeSat bus technology. The central avionics of CADRE are included on HA1L. We will demonstrate the following capabilities: Software modes Sensor and health checkouts Solar cells charging batteries UHF commanding and file transfer Beaconing and GPS tracking Watchdog-triggered reset Post-processed attitude determination

Requirements Applicable Documents DOC-01 University NanoSat Program SHOT II User's Guide Rev 5 Mission Statement Traceability Section MS-00 Fly a CADRE-based University of Michigan balloon payload (HA1L) PM Mission Requirements MR-02 Table 1: SHOT II Payload Deviations from CADRE (next slide) MR-01 MR-03 HA1L shall demonstrate successful entrance and exit from CADRE "SAFE" mode triggered by the CDH watchdog timer. MR-04 HA1L shall perform beaconing of attitude sensors, health and status MR-05 HA1L shall demonstrate successful downlink of simulated WINCS science data MR-06 HA1L shall be commandable by the ground operators during flight MR-07 HA1L shall execute commands to achieve the following operations modes: SAFE, STANDBY, and NOMINAL OPERATIONS System Requirements SYS-01 HA1L mass shall not exceed 1.5 kg 6.1.2 SYS-02 HA1L passthough hole inner diameter shall be between 4.0 and 6.4 mm 6.2.1 SYS-03 HA1L passthough tube shall not be metal SYS-04 HA1L separation distance to other payloads shall be less than 3 m SYS-05 HA1L shall have an American flag decal and contact information visible on the exterior 3.5 SYS-06 HA1L center of mass shall be kept towards the center DOC-01, MR-01 6.1.3 SYS-07 HA1L shall not broadcast on the following frequencies: 144.340 MHz (±15 kHz), 147.555 MHz (±15 kHz) and 445.975 MHz (±100 kHz) 6.2.3 SYS-08 HA1L transmitter shall be controller by a liscenced HAM operator SYS-09 HA1L Effective Isotropic Radiated Power (EIRP) shall be less than .4 W (26 dBm) SYS-10 HA1L transmitter shall be capable of a commandable deactivation SYS-11 HA1L shall be capable of surviving a shock loading of 15 g's 6.3.2 SYS-12 HA1L shall only use University of Michigan support equipment 6.3.3 SYS-13 HA1L shall maintain an operational temperature range between -0°C and 60°C. 3.4 SYS-14 HA1L power shall be provided through batteries 6.5.1 SYS-15 HA1L shall have external electrical switching to ensure system power is off until launch. SYS-16 HA1L shall ground external conducting faces to negative battery terminal 6.5.3 SYS-17 HA1L shall pass a "Whip" test 8.1.1 SYS-18 HA1L shall pass a "Drop" test 8.1.2 SYS-19 HA1L shall pass a "Stair Pitch" test 8.1.3 SYS-20 HA1L shall pass a "Cooler" test 8.2.1 SYS-21 HA1L shall pass a full functional test 8.3

CADRE HA1L HA1L/CADRE Connection: STR CDH COM ADCS EPS 3U structure designed in-house Deployable panels and antennas - 1U version of CADRE structure (room added for pass-through tube) Foam box for protection, thermal insulation, and mounting peripheral modules STR CDH FCPU board commands over standardized harnesses FCPU board commands over standardized harnesses UHF beacon/commanding S-band for data downlink UHF beacon/commanding Beacon will contain realtime telemetry COM Live control: 2˚ of ram (3 reaction wheels) Post-processed determination: 0.2˚ of ram 2 fine digital sun sensors, 1 star tracker, IMU, magnetometers, dual frequency GPS Post-processed determination: 5˚ 4 course sun sensors, GPS, 4 magnetometers, 3-axis gyroscope ADCS 8 strings of 4 cells, 4 strings of 7 cells Boost-buck regulated 3.3 V, 5 V, and 7.2 V lines 4 3,100 mAhr Li-ion batteries 2 strings of 2 cells Boost-buck regulated 3.3 V, 5 V, and 7.2 V lines 2 3,100 mAhr Li-ion batteries EPS

HA1L Design:

HA1L Design: HA1L’s avionics consist of CADRE’s first revision circuit boards which will be the majority of the satellite’s 3rd U. The boards are attached together by hex standoffs, which allow the board stack to be removed entirely from the structure.

HA1L Design: HA1L has 5 flight boards CDH FCPU (Stamp 9G20) UHF radio Watchdog timer (MSP430) ADCS Peripheral sensor modules, GPS Battery Board Bus power line regulators Li-Ion batteries Solar Board Buck-boost regulator -Z Interface Board Connections to solar cells

HA1L Design:

SHOT II Test Details: - Discuss your test program for you SHOT II design - Prove your project is ready for flight - Show test data (graphs, charts, etc) that are labeled, with key events indicated - Structural tests should be included but equal time should be devoted to mission/science tests (present mission/science test first) - Proof should be shown that you have actually recorded, off-loaded, and analyzed your data

SHOT II Test Details: Subsystem functionality was tested throughout board population Board-to-board tests were concurrent with assembly Full integrated system test included Conops and individual subsystem performance checks Test Assembly Document and System Level Test Procedures document capture assembly and test procedures 29 integrated system tests to verify requirements Basic Test Summary Mass ✓ Drop/Whip/Pitch Tests Pass Broadcast on forbidden bands? No Radio EIRP 0.3 W Operable min temperature Tube clearance Commandable radio shutdown? Yes

HA1L Integration and Test Highlights HA1L Integration Bench HA1L Whip Test

HA1L RF Spectrum Results: HA1L 437MHz Spectrum 437MHz Spectrum (MU S&T, StL U) 0-50kHz (MIT) *additional spectra in backup slides

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Additional Frequencies