Contents Mission Objectives System Overview Communication Overview Purpose

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications AAUSAT-II Communication System - A Plugin System for a Cube. Sat STEC 2005 April 8 th 09. 00 – 11. 00 Claus Nielsen cnie 02@space. aau. dk Control Department Aalborg University 21/02/2021 #1 Subsystem baseline

Contents 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 21/02/2021 #2 Subsystem baseline

System Overview Contents 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 21/02/2021 #3 Subsystem baseline

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications Communication Overview • • • MCC sends commands in KISS to GND transmits data in AX. 25 frames to COM pipes data to CDH which decodes the commands from the AX. 25 protocol 21/02/2021 #4 Subsystem baseline

Contents 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> 21/02/2021 #5 Subsystem baseline

Contents 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 21/02/2021 #6 Subsystem baseline

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications Hardware on COM • CAN Transceiver – SN 65 HVD 230 • Microcontroller – PIC 18 LF 6680 • Modem – CMX 469 A • Radio – Build by DF 2 FQ Holger Eckardt 21/02/2021 7 Subsystem baseline

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware 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 d. B Uplink margin 20, 5 d. B – CAN bus: 21/02/2021 #8 Subsystem baseline 125 kbps

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications for COM – Mass incl. Antenna: 110 g – Electrical: 3. 3 V Max Power Consumption: Listening: 184. 8 m. W Receiving: 283. 8 m. W Transmitting: 2085. 6 m. W 21/02/2021 #9 Subsystem baseline

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications Radio Communication Pictures sent through modem and radio 21/02/2021 10 Subsystem baseline

Contents Mission Objectives System Overview Communication Overview Purpose AX. 25 Hardware Specifications AAUSAT-II – Launch December 2005 WWW. AAUSATII. AAU. DK info@space. aau. dk 21/02/2021 11 Subsystem baseline