10), AstroBus L 250 M from Airbus Defence and Space, - Nominal mode: yaw steering - gyroless While Sentinel-1, -2 and -3 are completing their development phases and are scheduled to launch until 2014, Sentinels-4/5 are foreseen to provide a synergetic, complementary data set for atmospheric monitoring starting in 2020.

Moreover for this application involving tight outgassing specification, due to the 300 nm wavelength, the joining technology with organic bonding remains critical, what requires bake-out prior to assembly the lens plus barrel into its final position. Measurements are performed in 6 spectral channels, namely UV1 (270-310 nm), UV2VIS (300-500 nm), NIR1 (685-710 nm), NIR2a (745-755 nm) NIR2 (755-773 nm), SWIR-1 (1590-1675 nm) and SWIR-3 (2305-2385 nm), at a varying spectral resolution of 1 nm in the UV1 to 0.25 nm in the SWIR channels.

As a rule of thumb, the reduction in volume resulting from using an immersed grating w.r.t. Spacecraft Launch Sensor Complement References. One major contributor is also the instrument's sensitivity to the strongly varying polarization of the signal. • SWIR detector Figure 36: Location of blackened vanes (brown), image credit: Sodern. Figure 22: Sketch of a slit homogenizer for mitigation of across-slit (ALT) scene heterogeneity (image credit: ESA).

• Calibration subsystem 300-500 nm Lens glass substrate demands a unique mount for space launch. From the storage region the image is successively read out while the next image is already acquired in the exposure region.

Figure 7: Instrument development plan (model philosophy), image credit: Airbus DS. The energy distribution between the four spots of a classical DBCP scrambler's diamond pattern depends on the polarization state of the incoming light, which varies strongly not only with the viewing geometry, but also with wavelength. High frequency features in the measurement will be classified as PRNU. However, due to limitations on the dynamic range filters need to be employed leading to a blur of ghosts. Special techniques, like graded filters may be necessary to cope with the enormous dynamic range.

Finally, the instrument BSDF needs also to be determined [instrument BSDF (Bidirectional Scattering Distribution Function) is the ratio between the absolute radiance response and the absolute irradiance response of the instrument]. The SENTINEL-3 orbit has a revisit time of 27 days providing global coverage of topography data at mesoscale (inter-track distance at the Equator 104 km using one satellite), with a primary orbit sub-cycle of approximately 4 days, as described in Table 1.

A campaign with a Design Validation Sample was carried out, demonstrating the suitability of the CFRP cores and face sheets for the panels.

In a sun-synchronous orbit, the surface is always illuminated at the same sun angle. The stray light analysis program computes by tracing large numbers of rays. The instrument thermal control is based on separate passive radiative coolers providing margin for temperature stabilization with heaters: • UVN optics and FEEs @ 293 K (simplified optics alignment and electronics operational range), • UVN detectors and SWIR optics @ 225 K and 200 K, respectively (avoid detector RTS effects and reduce thermal optics background). >1250 Several reasons prevented discouraged the use of FEL source as irradiance source, being the main ones: the low UV flux of the FEL lamp, and the limited calibration validity (50 burn hours). Supporting European atmospheric composition and air quality monitoring services. UV2-VIS The telescope mirrors placed before the scrambler will therefore contribute to the instrument's polarization sensitivity.

The proposed approach for stray light mitigation purpose considers oversized of free mechanical aperture of optical surfaces with respect to the minimum clear aperture by at least 2 mm. The second and third element will be determined relative to the first element with a scan of linear polarized light in front of the earth port. irradiation. As for the Earth port, the measurements have to deliver input for both the line of sight with respect to the Instrument Alignment Cube (IAC), as well as the spatial response function. The broad targeted spectral range requires individual technology solutions for each spectrometer. 4). Figure 5: Illustration of the US CAS and VN CAS models (image credit: Airbus DS), Figure 6: SENTINEL-5/UVNS instrument operations scenario for in-flight calibration along the orbit (image credit: ESA, Airbus DS). The Sodern instrumental participation in Sentinel programs at a glance is depicted Table 9. The homogenizing effect can be quantified by transfer functions, which represent the across-slit intensity distribution resulting from a Dirac-type stimulus at the entrance of the SH. For in-orbit calibration purposes the Sentinel-5 instrument features a CAS (Calibration Assembly Subsystem), which injects different calibration signals via an actuated injection wheel with ports. The main characteristics of the MetOp-SG A satellite, hosting the SENTINEL-5 payload instrument, are presented in Table 3. - Radiometric accuracy (absolute): 3%, 6%(SWIR) of the measured earth spectral reflectance. In parallel more than 20 subcontractors have been selected to complement the team. The width of the UVNS total spectral range to be covered and the differencing requirements and technologies necessitate an implementation using a few separate dispersive elements not shown. The way forward consists of re-optimizing the optical design in order to increase the marginal ray angle of incidence. An efficient solution is in this case to insert a pad whose CTE is closer to the one of the glass between the optics and the flexure. The measurements with the Susi on the sun port will be performed for several angles such that the relative dependence on the sun incidence angle can be determined. Correction for the distortions of the final image, that are usually called "frown" or spatial misregistration and "smile" or spectral misregistration, is mandatory (Figure 28). NIR1, NIR2-a, NIR2 The stringent requirements on polarization sensitivity and RγRA necessitate the deployment of a pseudo-depolarizer or scrambler. The diffraction in reflection guides the rays again towards the detector. Once this is crossed, the sun irradiance and the remaining characterization and calibration measurements described above can be performed. Figure 34: Scene spectrum for stray light requirement (image credit: Sodern), Figure 35: Scene irradiance for stray light requirement (image credit: Sodern). • UV2VIS spectrometer optics Legend to Figure 23: The 2D color plot on the left panel shows the slit exit illumination (vertical axis) for a Dirac input illumination as a function of its position across the input of the homogenizer (horizontal axis). Those are described below: - Instrument structure and S/S mass dummies, - Simulated instrument to platform interfaces, - Including 2 telescopes, UV2VIS and SWIR-3 channels and 1 CAS, - Performance verification & calibration dry run, 4) PFM & FMs (Proto-Flight and Flight-Models). • Harness, 25 Mbit/s (max) and a maximum total data volume per orbit of 77.7 Gbit, Table 4: Sentinel-5/UVNS parameter specification. Low external surface emissivity ~0.17 is chosen so that radiative interfaces are expected to have relatively small effects. A reference diffuser allows monitoring the nominal diffuser for potential degradation. Europe Map (Credit: isardSAT), Figure 3: SENTINEL-3 Subcycle - 4 days - 57 orbits.

The UV2VIS Spectrometer optics (SO) is one of the seven optical modules of the UVNS currently under development. This is shown in Figure 1. The goal is to retrieve, with sufficient accuracy, the Calibration Key Data parameter values which will be used in the L0-1b processor. Basic information about the Copernicus Sentinel-5 Precursor mission: Copernicus Sentinel-5P data unavailability on 1 October, Copernicus Sentinel-5P anomalies in near real time dissemination orbits 14441 - 14449 (update), Copernicus Sentinel-5P anomalies in near real time dissemination orbits 14432 - 14441 and 14368 - 14376, Upcoming changes to Copernicus Sentinel-5P products, Processor update for Copernicus Sentinel-5P products, Copernicus Sentinel-5P Data Access and Products Fact Sheet, Copernicus Sentinel-5 Precursor Validation Team Workshop. Sentinel-5P datasets with sensing date older than one month are stored on the ONDA Cloud Archive. The Sentinels are a family of missions developed by ESA for the operational needs of the Copernicus programme. Sentinel-5P The Sentinels are a family of missions developed by ESA for the operational needs of the Copernicus programme. The SO operates at room temperature and is decoupled thermally from the baseplate with the low conduction bipods. The high accuracy requirement for retrieval of NO2 columns is driving the SNR in the VIS region to 1500. A spectral variable transmission coating or inverse filter is implemented on one of the collimator cylindrical lens in order to optimize the instrument spectral response; including optical transmission, spectrometer diffraction grating efficiency and CCD responsivity, for radiometric performances.

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