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CubeSat Communication System Overview for AAUSAT-II Mission

Learn about the communication objectives, hardware specifications, and subsystem baseline for the AAUSAT-II CubeSat mission. Understand the purpose, AX.25 protocol, and key components of the satellite's communication system.

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CubeSat Communication System Overview for AAUSAT-II Mission

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  1. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications AAUSAT-II Communication System - A Plugin System for a CubeSat STEC 2005 April 8th 09.00 – 11.00 Claus Nielsen cnie02@space.aau.dk Control Department Aalborg University Subsystem baseline

  2. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Mission Objectives Education Communication (One-way and two-way) Attitude Determination & Control System (Detumbling and pointing) Payload (Gamma Ray Detector) Extra solar panels Upload new software for communication with radio amateurs Subsystem baseline

  3. System Overview Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications MECH - Mechanical structure OBC – Onboard Computer CDH – Command Data Handler COM – Communication EPS – Electrical Power Supply P/L – Payload ADCS – Attitude Determination and Control System GND – Ground station MCC – Mission Control Center Subsystem baseline

  4. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Communication Overview • MCC sends commands in KISS to GND • GND transmits data in AX.25 frames to COM • COM pipes data to CDH which decodes the commands from the AX.25 protocol Subsystem baseline

  5. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Purpose of the Communication System Take care of communication between the Ground Station and the Command Data Handler Send Basic Beacon ”AAUSATII” <Battery Voltage XX> Subsystem baseline

  6. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications AX.25 Protocol Address – Source and destination Control – AX.25 frame type (Not used) PID – ID for Layer 3 for radio amateurs Info – Data to send FCS – Frame Check Sequence Bitstuffing • The AX.25 protocol is common used by radio amateurs • Radio amateurs can communicate with the satellite e.g. download housekeeping data Subsystem baseline

  7. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Hardware on COM • CAN Transceiver – SN65HVD230 • Microcontroller – PIC18LF6680 • Modem – CMX469A • Radio – Build by DF2FQ • Holger Eckardt Subsystem baseline

  8. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Specifications for COM Radio Frequency: 437.425 MHz (Half duplex) 6000 Hz bandwidth Datarates: 1200/2400/4800 baud FFSK-modulation Transmitting Power: 0.5 W Linkbudget (Worst case) Downlink margin 6,2 dB Uplink margin 20,5 dB CAN bus: 125 kbps Subsystem baseline

  9. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications Specifications for COM Mass incl. Antenna: 110g Electrical: 3.3 V Max Power Consumption: Listening: 184.8 mW Receiving: 283.8 mW Transmitting: 2085.6 mW Subsystem baseline

  10. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications • Pictures sent through modem and radio Radio Communication Subsystem baseline

  11. Mission Objectives System Overview Communication Overview Purpose AX.25 Hardware Specifications AAUSAT-II • Launch December 2005 • WWW.AAUSATII.AAU.DK • info@space.aau.dk Subsystem baseline

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