MERIS is a passive optical instrument, that will fly on the First Polar Orbiting Earth observatio... more MERIS is a passive optical instrument, that will fly on the First Polar Orbiting Earth observation mission ENVISAT 1, scheduled for launch mid 1998. The study and development of this instrument is currently carried by an international team led by AEROSPATIALE. The instrument primary mission goal is to monitor bio-optical ocean parameters on a large scale. Secondary goals of MERIS include atmospheric investigation on cloud and aerosols parameters and on land surface processes. The instrument will perform 15 spectral images, programmable in width and position with a spectral sampling interval of 1.25 nm within the visible spectral range of 400 nm to 1050 nm. MERIS images will have a swath width of 1100 km and spatial resolution of 300 m.
This paper describes a Compact High Resolution Imaging Spectrometer (CHRIS). CHRIS is designed to... more This paper describes a Compact High Resolution Imaging Spectrometer (CHRIS). CHRIS is designed to take images of the Earth in multiple spectral bands over the nominal spectral region 415 to 1050nm. The nominal spatial sampling interval will be 25m, however, larger sampling intervals are possible. Band selection, spectral bandwidths and the spatial sampling interval will be programmable. The instrument is planned to be launched on an agile small satellite of the 100kg class. This satellite will operate in a sun-synchronous, high inclination orbit at approximately 830km. At this altitude the instrument can provide 19 spectral bands with a spatial sampling interval of 25m at nadir. The field of view of CHRIS is 19km. Attitude control of the platform will allow access to non-nadir targets, multi-angle observations of selected targets and improved radiometric resolution.
Lightweight mirror techniques for space telescopes were identified, and development plans for tec... more Lightweight mirror techniques for space telescopes were identified, and development plans for technology demonstrations were prepared. The basic requirement is for mirrors up to 4 m diameter with area densities of 50 to 100 kg/sqm with aspherical form and a surface accuracy and quality appropriate for the efficient formation of diffraction-limited images with visible radiation. Segmented and membrane mirror systems
Surrey Satellite Technology Ltd has reviewed the ability of small satellites to provide additiona... more Surrey Satellite Technology Ltd has reviewed the ability of small satellites to provide additional capability to the presently defined Global Monitoring for Environment and Security (GMES) space segment, allowing the broadest set of user requirements to be met. User- focused services have been compared with the instruments defined for the currently proposed Sentinels. SSTL has developed the Disaster Monitoring Constellation (DMC) of small satellites at a very low cost, which provide land-focused data products in the visible wavebands with daily access capability. The study undertaken by SSTL for the European Space Agency analysed the DMC operational concept in a GMES context, reviewing a range of possible services with different payload configurations on small satellite platforms. One concept was selected and an appropriate payload definition derived. The chosen mission concept was based on the provision of near time operational oceanography information using a constellation of smal...
This paper describes the initial flight experience of the Compact High Resolution Imaging Spectro... more This paper describes the initial flight experience of the Compact High Resolution Imaging Spectrometer (CHRIS) developed at Sira Electro-Optics Ltd. The imaging spectrometer is flying on PROBA, a small agile satellite, which was launched in October 2001. The main purpose of the instrument is to provide images of land areas. The platform provides pointing in both across-track and along-track directions,
At the CHRIS/PROBA Workshop held last year in ESRIN a review was presented of various aspects ass... more At the CHRIS/PROBA Workshop held last year in ESRIN a review was presented of various aspects associated with the CHRIS calibration (1). The review addressed: first, the variation of the dark signal data, secondly, the use of the "generic" dark-field data sets for correcting analogue electronic offsets and, thirdly, the influence of the platform temperature variations on instrument response and
... Space and Systems BV, PO Box 12222, NL-IIOOAE Amsterdam-Zuidoost, Nederland and G. RATIER Obs... more ... Space and Systems BV, PO Box 12222, NL-IIOOAE Amsterdam-Zuidoost, Nederland and G. RATIER Observatoire Midi-Pyrenees, 14 Avenue E. Belin ... pixel (size), optically determined SWIR Shortwave infrared (1'2-3 JIm) T1R Thermal infrared (8-12'5 JIm) VIRI Visible/infrared ...
MERIS is a passive optical instrument, that will fly on the First Polar Orbiting Earth observatio... more MERIS is a passive optical instrument, that will fly on the First Polar Orbiting Earth observation mission ENVISAT 1, scheduled for launch mid 1998. The study and development of this instrument is currently carried by an international team led by AEROSPATIALE. The instrument primary mission goal is to monitor bio-optical ocean parameters on a large scale. Secondary goals of MERIS include atmospheric investigation on cloud and aerosols parameters and on land surface processes. The instrument will perform 15 spectral images, programmable in width and position with a spectral sampling interval of 1.25 nm within the visible spectral range of 400 nm to 1050 nm. MERIS images will have a swath width of 1100 km and spatial resolution of 300 m.
This paper describes a Compact High Resolution Imaging Spectrometer (CHRIS). CHRIS is designed to... more This paper describes a Compact High Resolution Imaging Spectrometer (CHRIS). CHRIS is designed to take images of the Earth in multiple spectral bands over the nominal spectral region 415 to 1050nm. The nominal spatial sampling interval will be 25m, however, larger sampling intervals are possible. Band selection, spectral bandwidths and the spatial sampling interval will be programmable. The instrument is planned to be launched on an agile small satellite of the 100kg class. This satellite will operate in a sun-synchronous, high inclination orbit at approximately 830km. At this altitude the instrument can provide 19 spectral bands with a spatial sampling interval of 25m at nadir. The field of view of CHRIS is 19km. Attitude control of the platform will allow access to non-nadir targets, multi-angle observations of selected targets and improved radiometric resolution.
Lightweight mirror techniques for space telescopes were identified, and development plans for tec... more Lightweight mirror techniques for space telescopes were identified, and development plans for technology demonstrations were prepared. The basic requirement is for mirrors up to 4 m diameter with area densities of 50 to 100 kg/sqm with aspherical form and a surface accuracy and quality appropriate for the efficient formation of diffraction-limited images with visible radiation. Segmented and membrane mirror systems
Surrey Satellite Technology Ltd has reviewed the ability of small satellites to provide additiona... more Surrey Satellite Technology Ltd has reviewed the ability of small satellites to provide additional capability to the presently defined Global Monitoring for Environment and Security (GMES) space segment, allowing the broadest set of user requirements to be met. User- focused services have been compared with the instruments defined for the currently proposed Sentinels. SSTL has developed the Disaster Monitoring Constellation (DMC) of small satellites at a very low cost, which provide land-focused data products in the visible wavebands with daily access capability. The study undertaken by SSTL for the European Space Agency analysed the DMC operational concept in a GMES context, reviewing a range of possible services with different payload configurations on small satellite platforms. One concept was selected and an appropriate payload definition derived. The chosen mission concept was based on the provision of near time operational oceanography information using a constellation of smal...
This paper describes the initial flight experience of the Compact High Resolution Imaging Spectro... more This paper describes the initial flight experience of the Compact High Resolution Imaging Spectrometer (CHRIS) developed at Sira Electro-Optics Ltd. The imaging spectrometer is flying on PROBA, a small agile satellite, which was launched in October 2001. The main purpose of the instrument is to provide images of land areas. The platform provides pointing in both across-track and along-track directions,
At the CHRIS/PROBA Workshop held last year in ESRIN a review was presented of various aspects ass... more At the CHRIS/PROBA Workshop held last year in ESRIN a review was presented of various aspects associated with the CHRIS calibration (1). The review addressed: first, the variation of the dark signal data, secondly, the use of the "generic" dark-field data sets for correcting analogue electronic offsets and, thirdly, the influence of the platform temperature variations on instrument response and
... Space and Systems BV, PO Box 12222, NL-IIOOAE Amsterdam-Zuidoost, Nederland and G. RATIER Obs... more ... Space and Systems BV, PO Box 12222, NL-IIOOAE Amsterdam-Zuidoost, Nederland and G. RATIER Observatoire Midi-Pyrenees, 14 Avenue E. Belin ... pixel (size), optically determined SWIR Shortwave infrared (1'2-3 JIm) T1R Thermal infrared (8-12'5 JIm) VIRI Visible/infrared ...
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