The two Vegetation instruments are passengers on board the Spot 4 and Spot 5 satellites.
The two Vegetation instruments are nearly identical. The only differences are:
- A few improvements of the optics: minimization of the stray light and modification of the SWIR sensor (Short Wave InfraRed).
- Improvement of the calibration system: supply of a reliable ground reference.
- Modification of the attitude restitution: Spot 5 winding.
- Use of 'star tracker' which ensures accurate location without Ground Control Points.
A few characteristics of the Vegetation instrument:
|Size||0.7 x 1.0 x 1.0 m³|
|Consumption||< 200 W|
|4 cameras||CCD + telecentric objective|
|4 spectral bands||Blue (B0), red (B2), near infrared (B3) and short wave infrared (SWIR)|
|Nearly constant resolution in the field of view|
|High geometric quality (no scanning mechanism)|
|Long integration time -> very good Signal/Noise ratio|
|Single video electronics|
|Mass memory||2.25 Go|
|On-board calculator (autonomous management)|
|X-band transmission chain|
|L-band transmission chain + dedicated antenna|