The Tensor Tech FSS-15 is a minimized fine sun sensor with a high cost-performance ratio. It is designed to be mass-produced with stable quality.

A microcontroller is embedded in the FSS-15 for tabulated correction using an error table. Therefore, the user can directly access the sun angles from digital interfaces. I2C and UART are two standard communication interfaces.

For the error table, every FSS-15 has a unique one, which will be measured before the shipment of the product to the user.

For less strict performance requirements, Tensor Tech also offers a coarse sun sensor: CSS10.

Key features

  • Digital-type Fine Sun Sensor
  • Pointing error: 0.1 deg (1 sigma)
  • Embedded firmware for radiation-caused transient error detection and recovery
  • 2-axes digital sun sensor embedded with calibration error table and micro-controller
  • Embedded firmware for radiation-caused transient error detection and recovery

Flight heritage

The system achieved flight heritage in 2022.

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Last updated: 2022-12-20

FSS-15 Fine Sun Sensor




lead time
2 mo
< 4 g
22.00 mm
15.00 mm
5.26 mm
power consumption
< 2 mA (sampling)
< 0.5 mA (idle)
field of view
±60 deg (±45 deg for optimal performaces)
field of view accuracy
±0.1 deg within ±45 deg FOV (1-sigma)
±0.5 deg within ±60 deg FOV (1-sigma)
sample frequency1
2 Hz
4 Hz
8 Hz
16 Hz
data interface

1. Adjustable by the user


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