From European Space Agency: “New maps of Earth from reflected satnav, invented at ESA”

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From European Space Agency

20 September 2019

Manuel Martín-Neira

Your phone or satnav receiver routinely picks up signals from navigation satellites in order to tell you precisely where you are. But have you ever thought what happens to those satnav signals afterwards? A foresighted ESA inventor had the idea of using them as a tool for observing the Earth.

There are currently more than 120 satellite navigation satellites in orbit, making up multiple constellations including Europe’s Galileo system, sending down a continuous rain of satnav signals for the benefit of users worldwide. Just like visible light, these microwave signals go on to reflect off Earth’s land and sea surfaces.

ESA Galileo’s navigation constellation

ESA Galileo Spacecraft

The traditional attitude to these reflected signals is to see them as something of a nuisance – known in the trade as ‘multipath’, they can confuse satnav receivers and reduce their overall accuracy.

But back in 1993 – at the same time as the US GPS satnav system reached its full constellation of 24 satellites – a young ESA microwave engineer called Manuel Martín-Neira came up with the idea of treating these satnav reflections as a scientific resource instead.

“My head of division asked me to come up with a budget-friendly way of increasing the overall sampling rate to build up a fuller picture of ‘mesoscale’ phenomena, and that led me to start looking into making use of additional signals of opportunity, chiefly satnav signals.

Satnav signals from satellites
Surveying using satnav with EGNOS and Galileo satellites.


“The initial reaction was mixed, because the forecast accuracy was not as precise as the ERS-1 altimeter could deliver – but on the plus side there would be a lot of these signals to make use of, and the performance has improved a lot since those early days.”

PARIS, detecting reflected satnav
14/02/2011 4:28 pm
Copyright ADS-SAU
The Passive Reflectometry and Interferometry System (PARIS) concept involves a dedicated constellation of satellites picking up reflected satnav signals from GPS, Galileo and other navigation satellite constellations to gather data on Earth’s sea and land surfaces. Operating on the same basis and in a similar way as current radar altimeters and scatterometers, these returning signals can be used to build up global maps of sea-surface height and wind and wave measurement over the ocean, determine ice extent and thickness of the icecaps and indicate soil moisture and biomass across land.(Figure courtesy of ADS-SAU).

Inspiration from reflection

The basic idea of what Manuel christened the ‘Passive Reflectometry and Interferometry System’ or PARIS comes down to a two-sided antenna. As the topmost side picks up a satnav signal from the satellites in orbit, the other side picks up the version of the signal bounced back from Earth.

By comparing this initial, overhead signal with its reflected equivalent using a process called interferometry – measuring tiny differences in signal phases – the extra travel time of this reflected beam can be determined, down to an accuracy of less than five centimetres, determining sea height and sea ice thickness.

Additional ‘amplitude waveform’ processing can deliver further data on wind and wave measurements over the ocean, and soil moisture and biomass over land.

‘Satellite reflectometry’ has since grown into a thriving field. This summer Manuel attended the latest international workshop on the method he first devised 26 years ago.

Copyright SSTL
Surrey Satellite Technology Ltd’s UK-DMC satellite was the first orbital mission with a reflectometry payload.

Reflectometry reaches space

“It’s been fantastic to have experimental evidence, and that’s really been made possible by the growing availability of smaller satellites,” explains Manuel.

“Because satellite reflectometry is a passive form of remote sensing, it makes for an attractive potential payload because it doesn’t need a lot of power to operate. Then one of the results is meteorology data that private companies intend to make money with by delivering to public agencies.”

Back in 2003, the UK-DMC satellite was the first mission to fly a reflectometry payload, followed in recent years by, for example, the UK’s TechDemoSat-1, NASA’s CyGNSS constellation to monitor hurricanes and the Spire Global constellation of commercial nanosatellites.


NASA CYGNSS satellite

Spire satellite

“These satellites have really given the reflectometry community a wealth of signals, demonstrating what reflections look like over different surfaces including sea ice, forests, and even inland water bodies such as the Amazon River and its tributaries.

“In parts of the ocean near continental masses and within atolls we are seeing reflected signals from very calm waters which resembled a mirror, giving us very high precision down to 1 cm level. Such measurements could potentially complement current altimetry missions, by for instance measuring sea level rise.”

ESA activities taking flight

ESA meanwhile is active on reflectometry in various ways, having developed and tested a steerable airborne antenna called the Software PARIS Interferometric Receiver or SPIR, capable of steering separate antenna beams to build up a rapid surface picture, and differentiating between different signal sources, such as GPS from Galileo.

Manuel adds: “ESA’s GNSS Science Support Centre, based at the Agency’s European Space Astronomy Centre near Madrid, has been taking a keen interest in these activities.”

ESA European Space Astronomy Centre near Madrid

Missions are also in development, including a dedicated CubeSat with RUAG-Austria and the University of Graz called PRETTY (for Passive REflecTomeTry and dosimetry, which would also carry a radiation detector), and a small satellite pair called FSSCat from Spain’s Universitat Politècnica de Catalunya, backed through the Copernicus Masters competition, seen as a prototype for a future reflectometry constellation.

ESA’s Directorate of Telecommunications and Integrated Applications is also working with the Spire company to fly enhanced reflectometry instruments, starting at the end of this year.

When it comes to the thriving state of today’s reflectometry community, Manuel recalls the patenting of his idea as a turning point: ‘Having had this idea, which was not particularly well received, the proposal by ESA’s Patents Group to patent it made all the difference. It gave me a feeling of confidence, that somebody else at least saw the potential of this idea – and the rest is history.”

See the full article here .

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The European Space Agency (ESA), established in 1975, is an intergovernmental organization dedicated to the exploration of space, currently with 19 member states. Headquartered in Paris, ESA has a staff of more than 2,000. ESA’s space flight program includes human spaceflight, mainly through the participation in the International Space Station program, the launch and operations of unmanned exploration missions to other planets and the Moon, Earth observation, science, telecommunication as well as maintaining a major spaceport, the Guiana Space Centre at Kourou, French Guiana, and designing launch vehicles. ESA science missions are based at ESTEC in Noordwijk, Netherlands, Earth Observation missions at ESRIN in Frascati, Italy, ESA Mission Control (ESOC) is in Darmstadt, Germany, the European Astronaut Centre (EAC) that trains astronauts for future missions is situated in Cologne, Germany, and the European Space Astronomy Centre is located in Villanueva de la Cañada, Spain.

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