STEAMR - The Stratosphere-Troposphere Exchange And climate Monitor Radiometer - is a Swedish scientific instrument for atmosphere research. Omnisys is the prime contractor for the instrument.

The STEAMR instrument will become the successor to the ODIN satellite, for which Omnisys designed and produced instruments and parts. When operational it will enable more accurate measurements of the global distributions of key target species in the Upper Troposphere – Lower Stratosphere, the UTLS.  Omnisys is responsible for the design, production and testing of the Front-End including the LO-, the IF- and phase-lock system, the digital autocorrelator Back-End, the power distribution and the control hardware.


  • The instrument will utilize a small linear array of receivers in order to achieve good vertical and horizontal resolution. The receivers will image different altitudes simultaneously backward along the satellite track, providing unique information about the 2-D structure of the atmosphere in the orbital plane.
  • The system consists of an array of 14 heterodyne receivers based on broad band sub-harmonically pumped planar Schottky diode mixers operating in the 320-360 GHz spectral range.
  • The signal originating from both sidebands is down-converted to an intermediate frequency, or IF, in the range 3,6-15,6 GHz.
  • The IF signal is filtered, amplified and spectrally resolved using autocorrelation spectrometers that provide a maximum instantaneous bandwidth of 12 GHz with a baseline spectral resolution of 10 MHz.


The STEAMR instrument is designed to detect and monitor changes in the climate as well as the development of the ozone layer, using satellite observations. When researching and producing climate models, water vapor in the atmosphere is one of the main causes of uncertainty.

STEAMR addresses this issue by adjusting atmospheric measurements for water vapor effects, creating a higher degree of measurement accuracy and minimizing uncertainty. The current focus of the STEAMR studies is on a Swedish mission.