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GeneSat-1 Overview

GeneSat-1 Overview. Built by NASA Ames, Cal Poly, Stanford Launched by NASA 3U cube, 10cm x 10cm x 34cm, 4.6 kg First cubesat to carry biological experiment. Structure. Custom frame made from 7075 Al square tube stock

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GeneSat-1 Overview

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  1. GeneSat-1 Overview • Built by NASA Ames, Cal Poly, Stanford • Launched by NASA • 3U cube, 10cm x 10cm x 34cm, 4.6 kg • First cubesat to carry biological experiment

  2. Structure • Custom frame made from 7075 Al square tube stock • Frame covered in Al panels, which provide a substrate for the solar arrays • Frame also provides a thermal radiation surface (“heat sink”) for the payload heater, and possibly a ground plane for the antennas

  3. *.Sat Bus • 1U cubesat bus developed by Stanford to provide power and communications to the primary payload • 6 custom PCBs: CDH, EPS, communications, and 3 ADS boards • CDH and EPS use PIC18 microcontrollers, using I2C for internal communication, as well as communication with payload • ADS boards mounted orthogonally enable measurement of linear acceleration and spin rate on 3 axes • 3-junction (28.3% efficient) solar cells, 4 strings, 224 sq. cm • 0.92 A (8.3 W) in orthogonal sunlight • Li ion batteries • Uses permanent magnets and hysteresis rods for ACS, as well as a sun sensor based on solar cell telemetry

  4. Payload • First cubesat to carry a biological experiment • Pressurized, sealed vessel • Custom optical array measures gene expression in E. coli by light emitted from GFP fused to a gene associated with metabolism • Once in space, E. coli are put in assay wells, sugar water is released to start the experiment • Uses COTS sensors for pressure, humidity, radiation, 3-axis acceleration, and temperature at 6 locations • Closed loop heater regulates temperature to +/- 0.5° C

  5. PPOD Launch on 16 December 2006 by a NASA Minotaur rocket LEO, 40° inclination, 415 km Beacon detected 1 hour after deplayment, S-band functional within 24 hours 96 hour primary mission completed Operation still nominal, secondary mission ongoing 50 minute clock drift in 13 days No CPU resets in 24 days Communications and Mission • 2.4 Ghz COTS S-band radio (frequency hopping)‏ • UHF beacon • 18m dish @ SRI International • Max 56% successful 2-way communication, 200 kbit/day average downlink, took > 2 weeks to download mission data

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