Thermal Control Design Conception of the Amazonia-1 Satellite

Silva, Douglas Felipe da; Muraoka, Issamu; Garcia, Ezio Castejon

doi:10.5028/jatm.v6i2.320

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ORIGINAL PAPERS • J. Aerosp. Technol. Manag. 6 (2) • Apr-Jun 2014 • https://doi.org/10.5028/jatm.v6i2.320 copy

Thermal Control Design Conception of the Amazonia-1 Satellite

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

Amazonia-1 is a Brazilian remote sensing satellite providing mainly images, in order to observe and monitor deforestation, especially in the Amazon region. This paper describes the thermal control design, which uses passive and active concepts. The active thermal control is based on heaters regulated by software via thermistors. The passive thermal control consists of multi-layer insulation blankets and radiators, paints, surface finishes to maintain temperature level of the overall carrier components within an acceptable value. The thermal control design is supported by thermal analysis using thermal mathematical model. The temperatures and heater power are predicted for critical cases.

KEYWORDS:
Amazonia-1 satellite; Satellite thermal control; Thermal mathematical model

Equipment	Temperature Range (ºC)	Heat Dissipation (W)
Equipment	Temperature Range (ºC)	Case A	Case B	Case C
	-100 ~ 80	0	0	0
BPF	-30 ~ 60	0	0	10.0⁽¹⁾ (1) 15 min of operation in illuminated period;
DSS	-10 ~ 45 (-20 ~ 55)⁽²⁾ (2) non-operational temperature range;	0	3.0	3.0
EPC (x2)	-20 ~ 60 (-30 ~ 75)⁽²⁾ (2) non-operational temperature range;	0	0.1	1.5⁽³⁾ (3) 15 min of operation in illuminated period (only main unit; the redundant one is on stand-by);
HPS	-20 ~ 50 (-30 ~ 60)⁽²⁾ (2) non-operational temperature range;	0	0	3.2⁽¹⁾ (1) 15 min of operation in illuminated period;
QPSK-TX	-10 ~ 45 (-20 ~ 50)⁽²⁾ (2) non-operational temperature range;	0	0	12.0⁽¹⁾ (1) 15 min of operation in illuminated period;
SDC	-10 ~ 45 (-20 ~ 55)⁽²⁾ (2) non-operational temperature range;	0	0	4.0⁽¹⁾ (1) 15 min of operation in illuminated period;
SPE1	-10 ~ 45	6.0	6.0	90.9⁽⁴⁾ (4) 25 min of operation in illuminated period.
SPE2	-10 ~ 45	22.1	22.1	101.6⁽⁴⁾ (4) 25 min of operation in illuminated period.
SSR	-10 ~ 45 (-20 ~ 55)⁽²⁾ (2) non-operational temperature range;	0	5.0	10.0
TWT (x2)	-20 ~ 60 (-30 ~ 75)⁽²⁾ (2) non-operational temperature range;	0	0	40⁽³⁾ (3) 15 min of operation in illuminated period (only main unit; the redundant one is on stand-by);

Equipment	Temperature Range (ºC)	Heat Dissipation (W)
Equipment	Temperature Range (ºC)	Case A	Case B	Case C
ACE	-10 ~ 45	18.0	14.0	20.0
Battery (x4)	-10 ~ 20⁽¹⁾ (1) At mounting panel;	2.3	2.3	2.8
GPS Antenna (x2)	-20 ~ 55 (-20 ~ 60)⁽²⁾ (2) Non-operational temperature range;	0	0	0
GYRO Elect. Module	-20 ~ 60 (-40 ~ 75)⁽²⁾ (2) Non-operational temperature range;	0	21.6	30.0
GYRO ICU	-20 ~ 60 (-40 ~ 75)⁽²⁾ (2) Non-operational temperature range;	0	0.1	0.2
LNA	-10 ~ 45 (-20 ~ 50)⁽²⁾ (2) Non-operational temperature range;	0	0.6	0.6
Magnetometer (x2)	-20 ~ 50	0	0	0
Magnetotorquer (x3)	-10 ~ 50	2.7	0	2.7
OBDH	-10 ~ 45	47	47	47
PCDU	-10 ~ 45	6.3	6.3	31.8⁽³⁾ (3) Operation in illuminated period;
Propulsion Elements	+10 ~ 50	0	0	0
Reaction Wheels (x4)	-15 ~ 55	6.7	6.7	40.4⁽⁴⁾ (4) 6 min of operation in illuminated period;
SADA (x2)	-20 ~ 60	4.6	5.1	6.5
Star Sensor (x2)	-20 ~ 50 (-40 ~ 70)⁽²⁾ (2) Non-operational temperature range;	0	0.2	13.5
TCE	-10 ~ 45 (-25 ~ 45)⁽²⁾ (2) Non-operational temperature range;	0	0	0.8
TT&C (x2)	-20 ~ 50	6.2	6.2	14.6⁽⁵⁾ (5) 15 min of operation in illuminated period (only main unit; the redundant one is on stand-by).
TT&C Antenna (x2)	-80 ~ 55	0	0	0

Coating	Emissivity (ε)	Absorptivity (α)		Effective Emissivity (εeff)
Coating	Emissivity (ε)	BOL	EOL	Effective Emissivity (εeff)
Bare Aluminum	0.05	0.15	0.15	-
Black Paint	0.88	0.95	0.95	-
MLI	0.80	0.41	0.51	0.02
White Paint	0.94 (BOL) 0.95 (EOL)	0.20	0.33	-

Radiator Location	Area (m²)
Radiator Location	MMP	Payload
+X Face	0.3624	0.2356
-X Face	0.1035	0.015
+Y Face	0.24	0.1596
-Y Face	0.432	0
Total	1.1379	0.4102

Heater	Power Consumption (W)
Heater	Case A	Case C
Batteries Panel	1.44	32.42
Payload Module	12.45	44.37
Propulsion Elements	3.69	2.85
Total	17.58	79.64

Departamento de Ciência e Tecnologia Aeroespacial Instituto de Aeronáutica e Espaço. Praça Marechal do Ar Eduardo Gomes, 50. Vila das Acácias, CEP: 12 228-901, tel (55) 12 99162 5609 - São José dos Campos - SP - Brazil
E-mail: submission.jatm@gmail.com

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[1] Author for correspondence: Douglas Felipe da Silva | Instituto Nacional de Pesquisas Espaciais - Av. dos Astronautas, 1.758, São José dos Campos/SP | CEP: 12.227-010 | Brazil | Email: douglas.silva@inpe.br