hydra-m - Sodern

HYDRA-M
HYDRA-M
CMOS Star Tracker
CMOS Star Tracker
HYDRA-M
HYDRA-M
Moderate Cost
Low Cost
MicroSat Compatible
SmallSat Compatible
Modular Design
Modular Design
©Sodern 2015
HYDRA-M is a low cost, low power, low mass star tracker providing autonomous 3-axis satellite
attitudes derived from observations of the celestial vault. Maximum performance is independent of
the FOVreplicates
configuration
and
orientation
of the satellite
is but
achieved
a wide
range
of (TEC)
angular
HYDRA-M
Sodern’s
flight
proven HYDRA-Baseline
star and
tracker
with the for
thermal
electric
cooler
and related
rates.
power
supply being suppressed. Despite this suppression, performance is maintained across a broad OH baseplate temperature
range without the TEC by the addition of software feature that compensates noise and spikes due to temperature and radiation
effects.
It features much
improved
size, weight
and power
characteristics
at proven
a substantially
reduced
price. HYDRA-M
The HYDRA-M
design
is a small
deviation
from Sodern’s
flight
HYDRA
Baseline
Active can
manage up to two Optical Heads (OH) from one or two Electronic Units (EU), interleaving the fields of view to enhance accuracy,
Pixel Sensor (CMOS) Star Tracker. The number of optical heads is limited to two without TEC
robustness and resilient operations.
regulation.
HYDRA is an autonomous flight proven CMOS Active Pixel Sensor (APS) star tracker that has evolved from Sodern’s world
class
CCD star
tracker with
a flis
awless
record
onlighter
more than
100
spacecraft
on GEO,and
LEOcan
and be
planetary
missions. This
TheSED26
HYDRA-M
Electronic
Unit
smaller
and
than
HYDRA
Baseline
used alone
star
tracker
ts fromunit.
miniaturization
and performance
featuresHeads
offered is
byincluded.
the most advanced HAS-2 radiation hardened
or with
a benefi
redundant
Cross-coupling
to the Optical
sensors and computing technologies. It is currently flying on highly agile Earth observation LEO spacecraft. The HYDRA design
is modular facilitating mounting the low power OH on an optical bench separate from the electronic unit. The performance,
The HYDRA-M
Headautonomy
is intended
usestar
ontracker
a temperature
regulated
base
plate.
Full
robustness,
resilienceOptical
and extensive
of the for
HYDRA
offer the potential
for AOCS
simplifi
cation.
performance is obtained for a maximum base plate temperature of 25°C for missions lasting up to
HYDRA-M
distinctive features are:
seven years.
■ The number of optical heads of HYDRA-M is limited to two with no need of detector thermal regulation for operation up to
50°C base plate temperature. This leads to a smaller and lighter Electronic Unit.
■ The Electronic Unit can be used alone or with a redundant unit and with optional cross-strapping of the Optical Heads
included.
■ In multiple head configuration, the Star Tracker is capable to deliver attitude from each Optical Head and also blended
attitude by combination of all Fields of View, offering enhanced accuracy on bore-sight and cross-sight axes; self-calibration
is proposed to automatically compensate for on orbit misalignments between Optical Heads.
20, avenue Descartes
94450 Limeil-Brevannes
- France
20, avenue Descartes
+33 (0)1
45 Limeil-Brevannes
95 70 00 - space@sodern.fr
94450
- France
www.sodern.com
+33 (0)1 45 95 70 00 - space@sodern.fr
www.sodern.com
deg/s
nMulƟple
space
Head Autonomous Aƫtude Sensor
2
@16 Hz
Up toMultiple
2 Optical
Heads
may be connected
1 or 2
Head
Autonomous
AttitudetoSensor
rth limb
Exclusion
Electronic Units with 8m cable length
Up to 2 Optical Heads may be connected to 1 or 2 Electronic
Head
(OH):
Units
with
up to 8m harness length
ullOptical
Moon
in FOV
ƒ
Baffle
protecting
the lens from direct Sun and Earth
g on one head with
illumination
Optical Head (OH):
ƒ Lens
made
of Rad-Hard
B
affle protecting
theglass
lens from direct Sun and Earth
sition
and tracking
ƒ HAS-2
APS detector
illumination
attitude
data both
ƒ Spacewire
interface
(MIL 1355)
with Electronic Unit
Lens made
of Rad-Hard
glasses
AS-2(EU):
APS detector
ElectronicHUnit
ƒ PowerSpacewire
Converter
supplying
OH andUnitthe
interface
(MIL 1355)the
with Electronic
Processing Unit
Electronic Unit
(EU)
ƒ Embedded
software
processing OH's data and
P
ower
Converter
computing the attitudesupplying the OH and the Processing
Unit Star Catalog
ƒ Embedded
Embedded software processes the OH data and
Typical attitude
accuracy
with 2 head blended solution
computes
the attitude
ƒ Bias <Embedded
11 arcsecStar Catalog
ƒ Thermo-elastic error < 0.055 arcsec/°C
Typical
attitude
with@2-head
blended
ƒ FOV
spatial
error accuracy
<0.7 arcsec
3σ three
axes solution
(EOL
7
years
in
LEO,
-20/+50°C):
ƒ Pixel spatial error <3.4 arcsec @ 3σ three axes
Bias <NEA
11 arcsec
ƒ Temporal
<0.8 arcsec/√Hz @ 3σ three axes
Environmental CharacterisƟcs
Temperatures:
ƒ Full performance -20°C to +25°C
ƒ Operating -30°C to +45°C
ƒ Storage -40°C to +70°C
Mechanical loads: Random 28 gRMS, Shocks 2000 gSRS
■■
■■
■■
■■
■■
■■
■■
■■
hermo-elastic error <0.055 arcsec/°C
T
FOV spatial error <0.9 arcsec @ 3σ three axes
AddiƟonal
Performance
Features
■■ Pixel
spatial error <3.6
arcsec @ 3σ three axes
■■ Temporal
NEAAcquisition
<0.8 arcsec/√Hz
3σ three
Autonomous
Attitude
in less@than
1.5 axes
second
■■
■■
Attitude tracking up to 2 heads simultaneously:
ƒ 15Additional
Stars per OH
Performance Features
ƒ Update
rate up
to 16 Hz
Autonomous
Attitude
Acquisition in less than 2.5 seconds
Robustness:
Attitude tracking up to 2 heads simultaneously:
ƒ Angular
rate determination
up to 10 deg/s
15 Stars
per OH
ƒ Acquisition
to selectable
8 deg/s from
in space
Updateup
rate
up tolost
16Hz
ƒ Tracking up to 8 deg/s and 7 deg/s2 @16 Hz
Robustness:
ƒ Sun
Exclusion Angle: 26 deg, Earth limb Exclusion
Angle:Acquisition
18.5 deg from lost in space up to 8 deg/s
Tracking up to
8 deg/s @16Hz
ƒ No performance
degradation
with full Moon in FOV
Sun
Angle: blooming
26 deg, Earth
limb
Exclusion
ƒ Robust
to Exclusion
Sun and Earth
on one
head
with
Angle:operating
18.5 deg
two heads
Noto
performance
with full Moon
in FOV
ƒ Robust
peak Solardegradation
Flare in acquisition
and tracking
Robust
to Sun
and Earth
blooming
on onedata
headboth
out of
Single FOV
and
blended
solution
attitude
available two
■■
■■
■■
■■
■■
■■
■■
■■
Robust to peak Solar Flare in acquisition and tracking
ISO 9001
EN 9001
©Sodern 2013
©Sodern 2015
Mechanical Interfaces (LEO with 26 Deg SEA)
1 OH: Mass 1.40 kg, Dimensions Ø146.5 mm x H283 mm
1 EU: Mass 1.35 kg, Dimensions:
168 x 158 x 65 mm3
Environmental Characteristics
Temperatures:
■■ Operating
range -30°C to +50°C
Electrical
Interfaces
■■ Storage -40°C to +70°C
Typical power consumption @ 20°C for 1EU and 2 OH: 7 W
Mechanical loads: Random 30 gRMS, Shocks 2350 gSRS
Electrical Consumption @ 20°C per OH < 1 W
Power supply: 21 to 52 Volts
Mechanical Interfaces (LEO, 26 deg SEA
Output data: MIL1553B
HYDRA-M
HYDRA-M
baffle)
OH: Mass 1.41 kg, Dimensions Ø146.5mm x H283mm
EU: Mass 1.3 kg, Dimensions 169 x 158 x 65 mm3
Reliability And LifeƟme
1 Electrical
OH: Level 1:
165 FIT, Level 2: 205 FIT / 1 EU: Level 1: 470
Interfaces
FIT,
Level
2:
555
FIT
Typical power consumption
over -20°C / +50°C for 1EU and
LEO
years
2OH:106.8
W (including 0.8W per OH)
Power supply: 21 to 52 Volts
Output data: MIL1553B or RS422 (AS/CS16 protocol)
Reliability and Lifetime
1 OH @ 20°C: 160 FIT /Level 1; 200 FIT /Level 2
1 EU @ 20°C: 440 FIT /Level 1; 600 FIT /Level 2
Designed for 10 years in LEO
Product developed with CNES funding