microsatellite constellation for earth observation in the ... · microsatellite constellation for...
TRANSCRIPT
![Page 1: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/1.jpg)
IAA Symposium on Small Satellites for Earth Observation
Microsatellite Constellation for Earth Observation in the Thermal Infrared
Region
Federico Bacci di Capaci Nicola Melega, Alessandro Tambini, Valentino Fabbri, Davide Cinarelli
![Page 2: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/2.jpg)
IAA Symposium on Small Satellites for Earth Observations
2
Index
1. Introduction 2. Requirements 3. Constellation Design Orbital Geometry Deployment Constellation Features
4. Platform
System Design Drivers Subsystems Mass Budget
5. Conclusive Remarks
20-24 April 2015, Berlin
![Page 3: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/3.jpg)
IAA Symposium on Small Satellites for Earth Observations
3
Introduction
20-24 April 2015, Berlin
AS-50 Platform
![Page 4: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/4.jpg)
IAA Symposium on Small Satellites for Earth Observations
4
Requirements
Mission requirements: • Innovative concept • Commercial interest • Single launch • Adaptation of AS-50 platform
– Satellite mass < 100 kg (AS-50x2) – Max size 440x440x820 mm3
• Operational life 4 years
Mission definition: • Multi-Sun-Synchronous Constellation
– Repetitive illumination conditions – Best for mid-low latitudes – Max 5 satellites in different orbital planes
• Thermal Infrared Remote Sensing: – Observations during day/night – Possible use of uncooled detectors – Several applications (water management, urban heat
islands, evapotranspiration etc...) – GSD around 60 m is the target value
Mission Statement: Design a microsatellite constellation for EO applications reducing the modifications to the current AS-50 platform and the overall mission cost
20-24 April 2015, Berlin
![Page 5: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/5.jpg)
IAA Symposium on Small Satellites for Earth Observations
5
Orbital Geometry (1)
Multi-Sun-Synchronous Constellation Conditions: • Satellites in circular periodic orbits:
– Same radius and inclination – Equally spaced in RAAN
• Each satellite provides complete coverage of the equator in a repetitiveness period
• Each satellite observes the same area at the same local time after an integer number of repetitiveness cycles
• Different satellites observe the same area with periodic illumination conditions
20-24 April 2015, Berlin
![Page 6: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/6.jpg)
IAA Symposium on Small Satellites for Earth Observations
6
Orbital Geometry (2) • h=572 km • i = 47.7 deg • ΔΩ=72 deg
• 121 days illumination repetitiveness period • 5x3=15 equally spaced passages over the same
Ground Track
20-24 April 2015, Berlin
![Page 7: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/7.jpg)
IAA Symposium on Small Satellites for Earth Observations
7
Constellation Features
• Example of observation capabilities: – Forlì, Italy (44.2° N) 109 obs. in 121 days – Widely spread observation times
20-24 April 2015, Berlin
![Page 8: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/8.jpg)
IAA Symposium on Small Satellites for Earth Observations
8
Deployment Strategy
• Drifting Parking Orbit Maneuver: – Same for all satellites – Larger semi-major axis – Slower nodal drift – No out-of-plane maneuvers
• Trade-off: ΔV vs. Deployment time • Analysis results:
– ΔV=237.3 m/s – Complete deployment in 294 days – Parking orbit altitude 1027.98 km
20-24 April 2015, Berlin
![Page 9: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/9.jpg)
IAA Symposium on Small Satellites for Earth Observations
9
System Design Drivers (1)
ΔV Requirement
20-24 April 2015, Berlin
Propulsion system: • Monopropellant, non-toxic, low-cost • Hydrogen Peroxide • Isp~120 s • Required volume: 14.79 dm3
Tank issue: • A large spherical tank would not allow for proper structural design of the
‘Payload’ Bay (~300x300x300 mm3) • Use of 4 COTS cylindrical tanks (ATK) Increase of platform size: 350x350x650 mm3 400x400x730 mm3
Operation ΔV [m/ s]Deployment 237.34Drag compensation 11.96Margin 20% 49.86Residual 2% 5.98TOTAL 305.14
![Page 10: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/10.jpg)
IAA Symposium on Small Satellites for Earth Observations
10
System Design Drivers (2)
Power generation
20-24 April 2015, Berlin
Body-mounted configuration: AOP: 28.1 ÷ 49.1 W (depending on LTAN)
• Nadir-pointing attitude profile (Nominal Mode)
• Variable solar vector position
• System simplicity • Analogy with AS-50
platform
Battery Charging Mode (Sun-pointing)
![Page 11: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/11.jpg)
IAA Symposium on Small Satellites for Earth Observations
11
System Design Drivers (3)
Sensor: • Uncooled microbolometer • 1024x768 px, 17µm pitch Optics: • EFL=162 mm • D = 118 mm • Swath = 61.44 km
20-24 April 2015, Berlin
Payload Duty cycle: • PL Power ~ 5.8 W • Increases RF power • Reduces batteries life
Average Consumption: 43.64 W (with margins)
![Page 12: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/12.jpg)
IAA Symposium on Small Satellites for Earth Observations
12
Subsystems (1)
Telecommunications • GS selection within Estrack network
– Perth (Australia) + Santiago (Chile) – Access for 81% of orbits (10 deg elevation) – Average access time 307.3 s
• RS data downlink in X-band – 10 Mbps with 1.86 W RF (~15 W at the S/C)
• TMTC uplink/downlink in S-band – Receiver: 4.3 W – Transmitter (rms over an orbit): 0.15 W
20-24 April 2015, Berlin
![Page 13: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/13.jpg)
IAA Symposium on Small Satellites for Earth Observations
13
Subsystems (2)
AOCS • Increased agility and
accuracy • Main sensors:
– Star Trackers – GPS Receiver
• Main actuators: – 3+1 RWs – H2O2 µthrusters
20-24 April 2015, Berlin
EPS • BM Solar Panels:
– 30 120x60 mm2 Ga-As cells per panel
• Li-Ion Batteries: – Same as current AS-50 – 6 packages, 6 batteries each – Capacity 340 Wh
![Page 14: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/14.jpg)
IAA Symposium on Small Satellites for Earth Observations
14
Mass Budget
20-24 April 2015, Berlin
TELECOMMUNICATIONS 4.38S-Band RTX 2 1.20S-band RTX Antenna 2 0.36HPA 2 0.36LNA 2 0.12X-band TX 1 0.60X-band Antenna 1 0.18X-band HPA 1 0.36Cabling - 0.72
PAYLOAD 3.96Sensor 1 0.36Baffle 1 1.50Optics 1 1.50Electronics 1 0.60
All values include 20% margin
TOTAL MASS: 93.17 kg
AOCS 44.44Reaction Wheels 4 4.32Star Trackers 2 0.84Magnetorquers 6 2.95Magnetometers 2 0.34GPS Receiver 1 0.28GPS Antenna 1 0.17Prop. System 1 5.22Prop. Electronics 1 0.32Propellant Tanks 4 6.53Propellant - 24.48 STRUCTURE 32.81
Bus Module 1 11.04Payload Module 1 10.90Lateral Panels 4 10.87
POWER 4.56Battery Packs 6 3.31PDU 1 0.50PMB 1 0.74
OBDH 0.53OBDH 2 0.53
![Page 15: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/15.jpg)
IAA Symposium on Small Satellites for Earth Observations
15
Conclusive Remarks
20-24 April 2015, Berlin
Mission requirements: Innovative concept Commercial interest Single launch Adaptation of AS-50 platform
Satellite mass < 100 kg (AS-50x2) Max size 440x440x820 mm3
Operational life 4 years
Phase-A output: • Proven feasibility • Defined orbital geometry • Initial system budgets • Preliminary subsystem
design
Alternative solutions: • Deployable SPs • Electric Propulsion • Use of TDI Read-Out mode
THANK YOU FOR YOUR ATTENTION!
![Page 16: Microsatellite Constellation for Earth Observation in the ... · Microsatellite Constellation for Earth Observation in the Thermal Infrared Region Federico Bacci di Capaci ... . 20-24](https://reader030.vdocuments.us/reader030/viewer/2022012909/5c6a319409d3f25e418c1b4d/html5/thumbnails/16.jpg)
IAA Symposium on Small Satellites for Earth Observations
Contacts
Federico Bacci di Capaci Mission Analyst
SITAEL S.p.A. Premises
Via Filippo Guarini, 13 47121 Forlì (FC) – ITALY
Tel: +39 0543 25280 Headquarters
Via San Sabino, 21 70042 Mola di Bari (BA) – ITALY
Tel: +39 080 5321796 Fax: +39 080 5355048
www.sitael.com
20-24 April 2015, Berlin 16