Polarization and Directionality of the Earth's Reflectance
| Mission type | Earth observation |
|---|---|
| Operator | CNES |
| Website | CNES Page |
| Spacecraft properties | |
| Launch mass | ~30 kg (66 lb) |
| Power | 30W |
| Start of mission | |
| Launch date | August 17, 1996 |
| Rocket | H-II (POLDER 1) |
| Launch site | Tanegashima Space Center |
| Main push broom scanner | |
| Type | Telecentric lens |
| Focal length | 3.57 mm (0.141 in) |
| Wavelengths | 443 and 910 nm FWHM |
| Resolution | 242x548 pixels |
| Transponders | |
| Band | Formed broad beam pattern UHF antenna |
| TWTA power | >5W |
| EIRP | 27.1 dBm |
|
|
|
| Mission type | Earth observation |
|---|---|
| Operator | CNES |
| Website | CNES Page |
| Spacecraft properties | |
| Launch mass | ~30 kg (66 lb) |
| Power | 30W |
| Start of mission | |
| Launch date | December 14, 2002 |
| Rocket | H-IIA (POLDER 1) |
| Launch site | Tanegashima Space Center |
| Main push broom scanner | |
| Type | Telecentric lens |
| Focal length | 3.57 mm (0.141 in) |
| Wavelengths | 443 and 910 nm FWHM |
| Resolution | 242x548 pixels |
| Transponders | |
| Band | Formed broad beam pattern UHF antenna |
| TWTA power | >5W |
| EIRP | 27.1 dBm |
|
|
|
| Mission type | Earth observation |
|---|---|
| Operator | CNES |
| Website | CNES Page |
| Spacecraft properties | |
| Launch mass | ~30 kg (66 lb) |
| Power | 30W |
| Start of mission | |
| Launch date | December 18, 2004 |
| Rocket | Ariane 5G |
| Launch site | Guiana Space Centre |
| Main push broom scanner | |
| Type | Telecentric lens |
| Focal length | 3.57 mm (0.141 in) |
| Wavelengths | 443 and 910 nm FWHM |
| Resolution | 242x548 pixels |
| Transponders | |
| Band | Formed broad beam pattern UHF antenna |
| TWTA power | >5W |
| EIRP | 27.1 dBm |
|
|
|
POLDER (POLarization and Directionality of the Earth's Reflectances) is a passive optical imaging radiometer and polarimeter instrument developed by the French space agency CNES.
The device was designed to observe solar radiation reflected by Earth's atmosphere, including studies of tropospheric aerosols, sea surface reflectance, bidirectional reflectance distribution function of land surfaces, and the Earth Radiation Budget.
POLDER has a mass of approximately 30 kilograms (66 lb), and has a power consumption of 77 W in imaging mode (with a mean consumption of 29 W).
POLDER utilizes a push broom scanner. The device's optical system uses a telecentric lens and a charged coupled device matrix with a resolution of 242x548 pixels. The focal length is 3.57 millimetres (0.141 in) with a focal ratio of 4.6. The field of view ranges from ±43° to ±57°, depending on the tracking method.
The device scans between 443 and 910 nm FWHM, depending on the objective of the measurement. The shorter wavelengths (443–565 nm) typically measure ocean color, whereas the longer wavelengths (670–910 nm) are used to study vegetation and water vapor content.
It transmits data on 465.9875 MHz at bit rate of 200 bit/s, and receives on 401.65 MHz at 400 bit/s. The data rate is 880 kbit/s at a quantization level of 12 bits.
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