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PV-EVO Telescope

Some years ago, OIP successfully developed & launched the Proba-Vegetation payload. The PV-EVO technology is based on the same concept and was meant to bridge the delta requirements between the Vegetation instrument (VI) and LANDSAT-like missions. The focus is being put on improving stray light & ground sampling distance performances, as well as on the enhancement of radiometric results. The main scope of this project consists of identifying a possible design approach for a miniaturised telescope. It should be able to cope with stringent requirements (as set for LANDSAT missions) and propose an “easy built” TMA approach, to be used on much smaller platforms.

The PV-EVO telescope disposes of a multi-purpose, multi-platform design, capable to withstand typical launch loads for medium size missions. PV-EVO’s main objective is to demonstrate the capability of small payloads, in order to achieve high-end performances, based on typical LANDSAT-mission specifications.

1. Payload comparison of the Landsat8 payload (OLI) and the proposed PV-EVO payload

Instrument Mass (kg) Average Power (W) Spectral bands GSD
OLI 450 140 9 15m/30m
PV-EVO 190 100 7 30m

 

The development of a telescope using the envisioned technology through GSTP design, supports the demonstration of small scale TMA performances which, if not equivalent are at least reaching the required high-end LANDSAT specifications in terms of geometry (GSD, FOV), image quality (MTF, Edge response) and radiometry (SNR for multiple spectral bands & straylight).

2. Main optical parameters of the Telescope

Parameter Value
Focal-length (across-track) 310.7mm
Maximum Aperture 78mm
Minimum f/# 4
FOV 14.4° x 3.38°

3. Main radiometric performances

SNR at Typical Radiance (W/m^2/sr/um) Radiance level to be considered Achieved SNR
Coastal Band (40.0) 40 76
Blue (40.0) 40 174
Green (30.0) 30 150
Red (22.0) 22 100
NIR (14.0) 14 95

Mission

The PV-EVO telescope was developed as a multipurpose, multiplatform development capable to withstand typical launch loads for a medium size mission. Initial focus of this development is to demonstrate capability of small payloads in order to achieve high end performances based on typical LANDSAT mission specifications.

OIP’s Participation

For this GSTP development, OIP was industrial prime as a contractor to ESA. OIP was in charge of the TMA design & the performance, structural and thermal analyses. OIP was responsible for the development of the TMA demonstrator and its integration in a representative focal plane assembly. The telescope’s full end to end verification.

Status

Technology demonstration validated

Available as “semi-commercial item”

Delta qualification & Development, depending on Mission Profile

Partners

AMOS was subcontractor for the telescope mirrors and structure manufacturing.

CSL was subcontractor for specific straylight analyses.

Gallery

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