Nanosatellites such as those built at Aalto University (named Aalto-1 and Aalto-2) are dispelling people’s preconceptions about what a satellite is and what it can achieve.
“While a traditional large satellite weighs around 500 kilogrammes, a nanosatellite weighs just 5 kilos,” states Jaan Praks, Assistant Professor at Aalto University, whose areas of expertise are remote sensing and space technology. “The price of a standardised nanosatellite is only a fraction of that of a large satellite.
When satellites are small and light, a carrier rocket can carry a large number of them into space at one time.
“Although the satellite is very small, its advanced technology means that its payload can be nearly equal to that of a larger instrument. The technology is miniaturised: smaller and smaller devices carry out increasingly demanding tasks.
Praks explains that a hyperspectral imaging camera built by VTT Technical Research Centre of Finland Ltd for remote sensing was launched along with Aalto-1.
“Whereas similar devices previously weighed 100 kilograms, our satellite’s camera weighs 600 grams.
Multiple pairs of eyes can see more than one
Thanks to the size of nanosatellites, one launch can include dozens of them. On April 18, 2017, the two-kilogramme Aalto-2 became the first Finnish-built satellite to be launched into space, part of an Atlas V launch from Cape Canaveral, Florida. On June 23, 2017, Aalto-1 made it into space on the Polar Satellite Launch Vehicle sent up by the Indian Space Research Organisation.
The students, who built Aalto-2, now work at Reaktor Space Lab, a start-up company which designs, manufactures and tests small satellites.
Reaktor’s Director of Space & Robotics Juha-Matti Liukkonen believes that small satellites will play a significant role in the IoT i.e. the Internet of Things.
“Small satellites will for their part produce essential data for the use of business. They will also extend the data network and information infrastructure to areas where these have not previously been available, such as to the Arctic Ocean.
“The crux of the matter is that multiple pairs of eyes can see more than one. A large number of small satellites can pass by the target more often and create a more real time situation picture.”
Sights set on the Arctic
The use of space applications to respond to the Arctic’s growing demands is highlighted in Finland’s space strategy. Another objective is to use open geospatial data to strengthen the competitiveness of services.
In practice, Arctic expertise combined with space expertise can refer to the provision of accurate navigational data to vessels travelling in the Arctic or to information on changes to the area’s natural conditions. Arctic space expertise can also refer to the provision of accurate data on the Northern Lights for the use of tourism.
Space technology can in part help in finding solutions to critical problems that impact the world population as a whole. In particular, satellites will help us gain a better understanding of climate change and allow us to measure it.
“Solving global problems will require global situation picture. We now understand weather phenomena better than previously as we can model the entire globe’s weather at one time using satellite data,” Praks says.
“Satellites provide accurate information on things such as the volume of atmospheric gases, cloudiness, the melting of glaciers, changes to the tree line, the melting of permafrost, flooding and many other phenomena.
According to the wildest visions, space technology could provide tools for mitigating climate change. These could include mirrors to be situated in space that reflect the sunrays as well as solar panels, from which emission-free power could be transferred to Earth via microwaves.
Future likely to hold surprises
What will the future hold?
“Much will happen including things which we did not expect. Things will perhaps happen at a pace slower than what we would like. However, infrastructure to be situated in space will be a key part of global infrastructure,” Praks says.
“Hyperspectral imaging cameras on satellites will give, for example, a large Australian farming corporation access to accurate information on what is happening on fields in remote areas and when it would be optimal to send, for example, combine harvesters to the area.
Small satellites alter satellite data into real time data – satellites allow us to receive real time data on such things as traffic and logistics.
“The satellite segment will be part of digitalisation. Space will hold an important part of the worldwide sensor network,” Praks explains.
By Matti Välimäki, July 2017