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AMSAT Fox-1 Overview . AMSAT Engineering Team 2011 Space Symposium. Fox-1 Introduction. AO-51 replacement 1-Unit CubeSat (4" x 4" x 4") Target orbit 650 km Magnetically stabilized FM transponder IHU for telemetry and command Science experiment. Fox-1 Operational Modes.

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amsat fox 1 overview

AMSAT Fox-1 Overview

AMSAT Engineering Team

2011 Space Symposium

fox 1 introduction
Fox-1 Introduction
  • AO-51 replacement
  • 1-Unit CubeSat (4" x 4" x 4")
  • Target orbit 650 km
  • Magnetically stabilized
  • FM transponder
  • IHU for telemetry and command
  • Science experiment
fox 1 operational modes
Fox-1 Operational Modes
  • Transponder Mode
    • FM repeater
    • Telemetry data sent as low-speed FSK in sub-audible band
  • Command Mode
    • Transmitter dedicated for data downlink
    • High-speed FSK
    • More power available for running experiment
special zombiesat features
Special "ZombieSat" Features
  • Designed to extend usable life
  • FM Transponder will operate with dead cpu
  • FM Transponder will operate without ground station intervention
  • FM Transponder will operate while in sunlight even with dead (shorted) battery
fox 1 systems
Fox-1 Systems
  • Power System
  • Internal Housekeeping Unit (IHU)
  • RF System
  • Antennas
  • Science Experiment
fox 1 system diagram

RF

System

Fox-1 System Diagram

Power

System

Solar

Cells

Battery

Power bus

70 cm

Antenna

2 m

Antenna

Science

Experiment

IHU

Sensors

power system solar panels
Power System - Solar Panels
  • 6 solar panels
  • 2 cells per panel
  • Spectrolab Ultra Triple Junction
  • Space-rated, high radiation tolerance
  • 28% conversion efficiency
solar cell characteristics
Solar Cell Characteristics

Spectrolab UTJ, 27cm2, Full Sun, 28C

slide11

MPPT Operation

Switching

Supply

Solar

Panel

Power Bus

Pulse Width

Control

Max-voltage

Sense

Tracking

Algorithm

power system block diagram
Power System - Block Diagram

SPV1040

+Z Panel

Power Bus

MPPT

Battery

Protection

SPV1040

X,Y Panels

MPPT (x2)

SPV1040

-Z Panel

PIC

I2C Interface

Battery

3 x NiCd

MPPT

power system battery
Power System - Battery
  • 3 x NiCad cells
  • 3.6 V nominal
  • 10 watt-hours
  • 10% depth of discharge
  • Charge: 0 to +45 C
  • Discharge: -20 to +60 C
dc power available
DC Power Available
  • 1.9 watts min in sunlight (no battery)
  • 2.2 watts average (max eclipse)
  • 2.8 watts average (no eclipse)
  • 10 watts peak power
internal housekeeping unit
Internal Housekeeping Unit
  • Collects telemetry information
  • Supports science experiment
  • Sends telemetry as low speed FSK w/FEC in transponder mode
  • High speed FSK w/FEC in command mode
  • Executes commands from ground control
ihu microcontroller
IHU Microcontroller
  • STMicroelectronics STM32L151VBT6
  • ARM3 Cortex CPU (32-bit)
  • Up to 33 MIPS @32 MHz
  • Designed for "ultra" low power consumption
  • 128K FLASH program memory
  • 16K RAM
  • On board RTC, D/A, A/D
rf system
RF System
  • 70 cm FM receiver (uplink)
  • 2 m FM Transmitter (downlink)
  • Transponder mode provides FM repeater
  • Command mode for running experiment
transponder mode

FM

Transmitter

Transponder Mode

CTCSS

Decoder

2-minute

Timer

PTT

70 cm

Antenna

2 m

Antenna

FM

Receiver

Audio

IHU

Commands

Low Speed FSK

command mode

FM

Transmitter

Command Mode

70 cm

Antenna

2 m

Antenna

FM

Receiver

IHU

Commands

FSK

Experiment

antennas
Antennas

2 meter whip

70 cm whip

vhf antenna swr

2.0

1.5

SWR

1.1

1.0

VHF Antenna SWR
uhf antenna swr

2.0

1.5

SWR

1.1

1.0

UHF Antenna SWR
science experiment
Science Experiment
  • Penn State University - senior design project
  • 3-axis MEMs gyro sensor
  • Measures satellite spin rate, spin direction and wobble about the magnetic axis in orbit
  • May include GPS receiver
fox 1 team
Fox-1 Team

Developers

Advisors

Logo by Steve Kenwolf

sound like fun
Sound Like Fun?
  • AMSAT is always hiring!
  • Engineering: mechanical, electrical, systems, software, project management
  • Satellite construction: PCB layout, parts procurement, surface mount construction, parts machining, testing

Contact Tony Monteiro, [email protected]

any questions

Any Questions?

AMSAT Engineering Team

2011 Space Symposium

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