ERK'2019, Portorož, 3-3 3
NEMO-HD Microsatellite - Technical Solution for Interactive 
Earth Observation Mission 
 
Hubert Fröhlich, Tomaž Rodič 
SPACE-SI – Slovenian Centre of Excellence for Space Sciences and Technologies 
E-mail: hubert.froehlich@space.si 
 
 
Abstract. NEMO-HD (Next-Generation Earth Monitoring and Observation – High Definition) 
is a high performance multispectral Earth observation microsatellite (65 kg) developed in 
collaboration between SPACE-SI and SFL, the Space Flight Laboratory of University of 
Toronto. The NEMO-HD payload consists of two instruments of which the primary instrument 
is capable of imaging in four spectral bands at a pan-sharpened GSD of 2.8m, and covers a 
swath width of 10 km and the secondary instrument produces images at a GSD of 40m and a 
much wider field of view. 
 
In addition to still imaging, both instruments can capture high definition video at 25 fps. The 
video is H.264 encoded and can be downlinked in real time when the satellite is within a line 
of sight with a ground station. The video channels are co-boresighted with the still imagery 
channels. This allows for a real-time imaging mode in which an operator can, during viewing 
the real-time video feed, command the spacecraft to acquire still images of area of interest.  
NEMO-HD includes standard complement of subsystems, sensors and actuators that make up 
a three-axis stabilized bus. Payload data will be downlinked via 50 Mbps X-band downlink. It 
has 279.4 GB of on-board storage, a high-performance instrument computers, solar pannels 
capable of producing 55W of power and 300 Wh Li-ion battery.