Thursday, April 10, 2008

WorldView-1 Satellite Sensor Characteristics

Scheduled Launch Date September 18, 2007
Launch Vehicle Boeing Delta 7920 (9-strap-ons)
Launch Location Vandenberg Air Force Base, California, USA
Orbit Altitude 496 Km
Orbit Inclination sun-synchronous
Spacecraft Size, Mass & Power 3.6 meters (12 feet) tall x 2.5 meters (8 feet) across,
7.1 meters (23 feet) across the deployed solar arrays
2500 kilograms (5500 pounds)
3.2 kW solar array, 100 Ahr battery
Equator Crossing Time 10:30 AM (descending node)
Revisit Time 1.7 days at 1 meter GSD or less
5.9 days at 20° off-nadir or less (0.51 meter GSD)
Swath Width 17.6 Km at nadir
Full Scene 17.6 Km x 14 Km or 246.4 Km 2 at nadir
Orbit Time 94.6 minutes
Dynamic Range 11 bits per pixel
Resolution 0.50 meters GSD at nadir

0.55 meters GSD at 20° off-nadir
(note that imagery must be re-sampled to 0.5 meters for non-US Government customers)
Sensor Bands Panchromatic
Metric Accuracy Accuracy: <500 meters at image start and stop
Knowledge: Supports geolocation accuracy below
Geolocation Accuracy
(CE 90%)
Specification of 12.2 m CE90, with predicted performance in the range of 3.0 to 7.6 meters (10 to 25 feet) CE90, excluding terrain and off-nadir effects

With registration to GCPs in image: 2.0 meters (6.6 feet)
Retargeting Ability Acceleration: 2.5 deg/s/s
Rate: 4.5 deg/s
Time to slew 300 kilometers: 9 seconds
Attitude Determination and Control 3-axis stabilized
Actuators: Control Moment Gyros (CMGs)
Sensors: Star trackers, solid state IRU, GPS
Onboard Storage 2199 gigabits solid state with EDAC
Communications Image and Ancillary Data: 800 Mbps X-band
Housekeeping: 4, 16 or 32 kbps real-time, 524 kbps stored, X-band
Command: 2 or 64 kbps S-band
Max Viewing Angle /
Accessible Ground Swath
60 x 110 km mono
30 x 110 km stereo

WorldView-1 Satellite Sensor

WorldView-1, DigitalGlobe's earth imaging satellite, completed a successful launch from Vandenberg Air Force Base, California, U.S.A., at 11:35 Hrs Pacific Daylight Time (PDT) on September 18th, 2007. The Delta II rocket lifted off in good weather and the WorldView-1 satellite is "currently undergoing a calibration and check-out period," according to DigitalGlobe. The first panchromatic image data should become available before October 18th, 2007.

To view a video of the WorldView-1 satellite launch, click here.

The high-capacity, panchromatic imaging system features half-meter resolution imagery. Operating at an altitude of 496 kilometers, WorldView-1 has an average revisit time of 1.7 days and is capable of collecting up to 750,000 square kilometers (290,000 square miles) per day of half-meter imagery. The satellite is also equipped with state-of-the-art geo-location capabilities and exhibits stunning agility with rapid targeting and efficient in-track stereo collection.