Air & Cosmos N 2436 15 jan 2015
Sisyphus
THE VISIBLE TO INVISIBLE
Sisyphus THE PROGRAM (SPECTRO-IMAGING MEASUREMENT SYSTEM hyperspectral SHIPPED PROPERTIES)
STARTS A NEW STAGE WITH LAUNCH OF ASSESSMENT OPERATIONAL CONDITIONS ON SCENARIOS DEFINED DGA: TARGET DETECTION camouflaged DISCRIMINATION LURES ...
The General Armaments Department has notified the market for a period of 44 months at Onera to assess, in operational conditions, the Franco-Norwegian airborne demonstrator Sisyphus (System imaging spectrometer for measuring embedded hyperspectral properties) . Developed as part of a study upstream of the DGA. Sisyphus is a unique and innovative system in Europe. "This study, the program started from a PEA which was to demonstrate the contribution of multi- and hyper-spectral imaging in the detection of areas, recognition and identification of defense needs. Sisyphus is rather airborne appearance, with observation of a sufficient distance, ie Space or embedded carriers, "commented Laurent Rousset-
Rouviere, head of Sisyphus program.
A RESOLUTION OF 50 CM GROUND.
The peculiarity of Sisyphus is to be a research medium that has great performance. At 2000 m, the resolution is 50 cm on the ground. Sisyphus also has a high spectral resolution with 500 color bands and a radiometric resolution. "In other words, the lowest noise to get as many details as possible in the light level," adds Laurent Rousset-Rouviere. Sisyphus was launched in 2007, Onera is the prime contractor
system and defined the specifications for Norway. The latter was involved in the development of hyperspectral system near infrared, named Odin. "The Norwegians are very advanced in the development of near-infrared instruments. Under Sysiphe. they were asked to produce a more effective instrument in the visible hyperspectral field, we bring our side infrared in the form of Sieleters, covering the middle infrared bands or MWIR (3 to 5.5 pm) and long (8 to 11.5 pm). We are really complementary to that fact, "says Laurent Rousset-Rouviere.
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CLEARING AND georeferencing.
A Odin and Sieleters, adds a third data processing instrument whose design was provided by the ONERA Toulouse site, which collects Odin and Sieleters data to construct the entire spectrum. "Recalibration is 11: the same pixel is the corresponding spectrum. 11 There is also another algorithm called compensation effects of the atmosphere. Since we are airborne, the atmosphere has a certain transmission, a certain issue, it is necessary
atmosphere back to the optical properties of the scene and objects, that is to say, their emissivity réfectance, and see the temperature of the object. The result is in the form of either luminance georeferenced maps, that is to say in the unit of luminous flux, either réfectance emissivity or temperature of the scenes, "adds Laurent Rousset-Rouviere.
800 KG FOR 2 TO 3 M3.
The dedicated test platform is a Dornier Do-228, borrowed from the DLR. "The instrument is quite large and this unit has a hatch floor large enough size to be able to pass the 800 kg and 2 to 3 m3 of the whole, "says Laurent Rousset-Rouviere. The unit flies slowly, 260 km / h. "We are not yet at an operational system that could be installed on a Rafale, for example. We are looking for the moment to have performance. We also want to demonstrate the value and capabilities of this technology. The design of an operational system to go on a given vector will eventually "adds Laurent Rousset-Rouviere.
The system was installed on the C-228. The test campaign began in September 2013 in Cazaux. The system has been qualified according to the specifications given at the beginning of the market, a resolution of 50 cm on the ground, a large swath of 500 m wide, a band of 3 km long on average as well as a list of parameters techniques, defining the quality of the instrument, to verify and measure the field. This campaign took place over a period of two weeks and a half. "This has been a great success. We flew almost every day,
by collecting 62 km from the data, which is pretty phenomenal. We then went flying over the ONERA site Fauga-Mauzac where we installed white panels and different materials such as sand, polystyrene, on asphalt or concrete, to see the differences in luminance each material, "says Laurent Rousset-Rouviere. A ground crew was making field measurements, while the plane was flying over the site to acquire hyperspectral data at 2000 m altitude. Which was then used to compare the data collected in flight measurements
that had been made on the ground to see if the instrument responded well to the requirements.
DETECTION ANOMALY.
Following these tests, the DGA has recently reported a new forty-four months market. The objective is to test the market Sysiphe on military operational scenarios. These scenarios will be determined and implemented by the French and Norwegian Ministries of Defence, before being implemented on the ground on the site of Canjuers. "We'll just fly over the site to try to find what was erythematosus. We are no longer in production of hyperspectral imaging, but one step further. We now use code to handle these hyperspectral data, "adds Laurent Rousset-Rouviere. On a headband 3 km long and 500 m wide, more than 500 images of the same scene are harvested. It is therefore impossible to watch every shot in order to find something wrong. "We have the advantage of having at our disposal of computers and algorithms that can mean we quickly anomalies they belong, that's what we call anomaly detection. Take the case of a camouflage net in a field, the system will inform the operator of the different signature from the surrounding vegetation, "says Laurent Rousset-Rouviere. The first campaign is expected to begin in August 2015. The use of the system tests degraded weather conditions are also provided, that is to say in the presence of scattered clouds above the plane that change the light output from the sky.
POLLUTION AND GAS.
"We are also going to look at the night hyperspectral, which has many elements of interest, as the field of gas, we can determine whether a polluted industrial site or if there is presence of poison gas, for example. We are able to characterize all effluent of an industrial site, whether liquid, solid or gaseous. Sisyphus is also a national and international system in the sense that anyone can ask for data acquisition in the civil context as a soldier in the NATO framework or partnership with the European De-fence Agency (EDA), "concludes Laurent Rousset-Rouviere.
P.S so some sort of imaging system is being developed to be installed in fighter planes in future
