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CanX-2 Briefing

Learn about the CanX-2 satellite launched in 2007 with innovative technologies for a dual satellite mission. Explore its propulsion system, communication setup, science payloads, and experiments conducted in space.

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CanX-2 Briefing

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  1. CanX-2 Briefing KySatMorehead, KY Michael Gailey

  2. CanX-2 Overview • Canadian Advanced Nanospace eXperiment • University of Toronto • Launch Date: June 30, 2007 • Launch Vehicle: Antrix Polar Satellite Launch Vehicle from India • Deployment Mechanism: X-Pod • Projected Orbit: Sun-synchronous • Dimensions: 10 x 10 x 35 cm • Weight: 3.5 kg • Primary Mission • Pathfinder for a 2008 dual satellite mission that will test formation flying • Technologies that will be evaluated • Novel propulsion system • Custom Radios • Innovative attitude sensors and actuators • Commercial GPS receiver

  3. Subsystems • Structure: Custom aluminum frame • EPS • 2 - 7 W from 22 triple-junction GaAs solar cells • 3.6 Ahr Lithium-Ion battery • Unregulated satellite power bus operates from 3.6 to 4.2V • On Board Computers • Arm7 main processor • Arm7 payload processor • Each run at 15mHz with 8 MB of total SRAM • Each has 16 MB of flash storage for telemetry, science data, images and code • Communications • Full duplex system • Uplink: UHF transceiver (4 kbps) using a quad canted monopole antenna • Downlink: S-band (32-256 kbps) • Beacon: VHF which broadcasts telemetry on a continual basis

  4. Attitude Control and Propulsion • Attitude Determination • Sun sensors developed in-house • 3-axis Magnetometers developed in-house, deployed at the end of a 20 cm boom • Accuracy of ±1º • Attitude Control • Momentum bias system consists of: • 3 Orthogonal vacuum-core magnetic torquer coils • Dynacon Momentum Nanowheel • 3-axisattitude control with accuracy of ±10º and a pointing stability of ±1º • Propulsion • Liquid fueled cold gas system • Uses sulfur hexaflouride as a propellent • Thrusting will induce a major axis spin which will be measured using the attitude determination systems

  5. Science Payloads • Atmospheric Spectrometer • Purpose: Detect pollution variations to create better computer models of pollution distribution • How: Measures greenhouse gas levels using Earthshine spectra in the near infrared band. Surface resolution of 1km • GPS Signal Occultation Experiment • Purpose: To develop models that can be used to help mitigate GPS positioning errors during periods of enhanced ionospheric activity • How: Compare space-based GPS signals to signals measured at ground-based stations. Atmospheric properties like total electron content and tropospheric water vapor as a function of altitude can be reconstructed • Atomic Oxygen Material Degradation Experiment • Purpose: Evaluate the effectiveness of a special coating in protecting materials from atomic oxygen erosion in space • How: Measure the thicknesses of a coated material and an uncoated material over time • Communications Protocol Experiment • Purpose: To test an innovative low Earth orbit (LEO) satellite communication protocol. Addresses data transport errors that occur specifically in LEO satellite links

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