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(1)

CUBESATS ACTIVITIES AT THE

UNIVERSITY OF LIÈGE

Xavier Werner

Space Structures and Systems Lab.

Aerospace & Mechanical Engineering Dept.

University of Liège

(2)

OUFTI-1

(3)

OUFTI-1, Belgium’s first nanosatellite, launched 25 April 2016

on Soyuz Flight VS14 under 1st FYS programme

(4)
(5)

OUFTI-1 heard all over the world!

(6)

OUFTI-2

(7)

OUFTI-2 missions

Primary

D-STAR: Provide D-STAR amateur radio communication repeater

in space

Secondary

RAD: Test two different types of shields to protect electronics from

space ionizing radiations

IMU: Estimate attitude of satellite using inertial & magnetic

(8)

What is D-STAR?

D

igita

l-

S

mart

T

echnology for

A

mateur

R

adio

Digital communication protocol

Voice & data transmission

Radio & internet (roaming)

Radio transmissions on VHF, UHF, and L bands

Data: 1200 bps - Voice: 3600 bps (AMBE encoding)

GMSK modulation

(9)

How amateur-radio operators will use OUFTI-2 (1)

Antenna footprint

OUFTI-2

(10)

How amateur-radio operators will use OUFTI-2 (2)

D-STAR Zone

OUFTI-2

User B

D-STAR Zone ULg

User A

in antenna

footprint

Satellite Ext.

Internet

VHF C

UHF B

Controller

Gateway G

1.2 GHz A

D-STAR Repeater

VHF C

UHF B

Controller

Gateway G

D-STAR Repeater

ULg

(11)

Complete OUFTI-2 system: space & ground segments

(12)
(13)

VHF antenna (truncated)

MECH (ant. deployment)

UHF antenna (truncated)

Base plate

Chassis

Solar panels

Cover plate

OUFTI-2 CAD model

(14)

BCN & IMU payload

EPS

RAD payload

OBC

Batteries

AX.25 & D-STAR

payload

ADCS (hysteretic

rods)

ADCS (permanent

magnet)

(15)

OUFTI-2: hardware architecture

Radio link

Power link

Data link

(16)

Let’s take

a photo tour of

OUFTI-2

(17)

On-board computer (OBC): OBC1 & OBC2

(18)
(19)
(20)
(21)
(22)
(23)
(24)

Ground segment

(25)

Ground segment: hardware architecture

Polarization switch Polarization switch Pre-amplifier

Rooftop

Control

room

Splitter Amplifier Combiner IC-910H (BCN) IC-9100 (D-STAR) IC-910H (AX.25) IC-910H (D-STAR extension ) Rotor controller Rotor remote controller BCN computer: - BCN decoding -Rotor control/satellite

tracking with Orbitron -Frequency control of IC-910H & IC-9100

AX.25 computer: - AX.25 decoding/ encoding through TNC TNC VHF C UHF B Controller Gateway G

D-STAR

segment

Control

segment

Internet

D-STAR

terrestrial repeater

Satellite tracking

antenna

(26)

Let’s take

a photo tour of

OUFTI-2

(27)
(28)

Ground segment: rooftop

D-STAR repeater antenna

Satellite tracking antenna

(29)

OUFTI-NEXT

(30)

Mission concept

Smart irrigation strategy of agricultural fields

à

Possibility to detect lack of water by monitoring the leaf surface temperature

69% of water used for agriculture

40% of the fields are irrigated

(31)

Mission specification

Long term goal:

• 50m resolution

• Daily revisit (constellation)

• Mid-wave IR

(32)

Preliminary feasibility study

Feasibility study of an in-orbit demonstrator:

100m ground resolution

CubeSat standard

Fast development (<2 years)

(33)

Payload

Developed by CSL

Mid-wave IR telescope

(34)

MWIR cooled detector

Three Mirrors Anastigmat by Amos

Visible camera (TBC)

(35)

Platform

ADCS

Payload

S-Band antenna

VHF/UHF antenna

PCB’s

(36)

Platform

(37)

Thanks for

your keen

interest!

(38)

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