US commercial applications - IKONOS
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IKONOS
IKONOS is a commercial earth observation satellite that collects high-resolution imagery at 1- and 4-meter resolution. It offers multispectral (MS) and panchromatic (PAN) imagery. It provides imagery beginning January 1, 2000. The company GeoEye distributes IKONOS imagery under the product name CARTERRA.
IKONOS comes from the Greek word for "image". Ikonos-1 was planned for launch in 1999 but the launch failed. Ikonos-2 was planned for launch in 2000, but was renamed Ikonos and was launched on September 24, 1999 from Space Launch Complex 6 (SLC-6) at Vandenberg Air Force Base in California to replace Ikonos-1.
Specifications
Spacecraft
Ikonos-2 is a 3-axis stabilized spacecraft, using the LM900 satellite bus system (also referred to as Block-1). The attitude is measured by two star trackers and a sun sensor and controlled by four reaction wheels; location knowledge is provided by a GPS receiver. The design life is 7 years; S/C body size=1.83 m x 1.57 m (hexagonal configuration); S/C mass = 817 kg; power = 1.5 kW provided by 3 solar panels.
The LM900 spacecraft is a three-axis stabilized bus that is designed to carry scientific payloads in LEO orbits. It provides precision pointing on an ultra stable highly agile platform. Payloads for a variety of scientific and remote sensing applications may be accommodated including laser sensors, imagers, radar sensors, electro-optical and astronomical sensors, as well as planetary sensors. The LM900 spacecraft design was based on the CRSS imaging bus. Hardware heritage is from CRSS and IRIDIUM.
Communications
IKONOS conducts telemetry, tracking and control in the 8345.968-8346.032 MHz band (downlink) and 2025-2110 MHz band (uplink). Downlink data carrier operates in the 8025-8345 MHz band.
Spatial resolution
- 1-meter panchromatic (1-m PAN)
- 4-meter multispectral (4-m MS)
- 1-meter pan-sharpened (1-m PS)
Spectral Resolution
| Band | 1-m PAN | 4-m MS & 1-m PS |
|---|---|---|
| 1 (Blue) | 0.45-0.90 µm | 0.445-0.516 µm |
| 2 (Green) | * | 0.506-0.595 µm |
| 3 (Red) | * | 0.632-0.698 µm |
| 4 (Near IR) | * | 0.757-0.853 µm |
Temporal resolution
The revisit rate for IKONOS is 3 to 5 days off-nadir and 144 days for true-nadir.
Swath
11 km x 11 km (Single Scene) [1]
