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The Advanced Coarse Sun Sensor (ACSS) by Solar MEMS offers high reliability and radiation hardness for the most demanding LEO and GEO missions. The ACSS is a device for sun-tracking and attitude determination. This sensor measures the incident angle of sun ray in two orthogonal axes, providing a high sensitivity based on the geometrical dimensions of the design.

ACSS sun sensor offers high reliability and radiation hardness for the most demanding LEO and GEO missions. ACSS technology has flight heritage since 2019 with hundreds of flight units delivered, and its manufacturing process has been developed and industrialized for mass production requested for satellite constellations.

ACSS sensor is based on MEMS fabrication processes to achieve high integrated sensing structures. ACSS is a highly suitable sun sensor for satellite constellations and demanding missions due to its redundancy, reliability and hardness.

Some key features of the ACSS include:

  • 2 orthogonal axes
  • Analog, 15-pin micro connector electrical interface
  • Aluminum 6082, alodine + black anodizing housing
  • Manufacturing capacity of 100 ACSS per month
  • Each ACSS is calibrated, evaluated and tested
  • Quality control: > 50 inspection points/KC
  • EMC/ESD: ECSS-E-ST-20-07C, MIL-STD-461F
  • Reliability: 8 FIT @ 30oC
  • Flight heritage: > 500 years cummulated time in orbit without failures

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Last updated: 2022-06-14

ACSS - Advanced Coarse Sun Sensor



40 g
65 mm
47 mm
13 mm
field of view
±60 deg
< 0.5 deg (3-sigma, calibration)
< 0.05 deg
3 mA
power supply
15 to 30 V
operating temperature
-45 to 95 C
survival temperature
-60 to 125 C
radiation tolerance
200 kRad (gamma)
random vibration
18.3 g @ 20-2000 Hz
2000 g
> 10 yr


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