Advanced Land Observing Satellite
Advanced Land Observing Satellite (ALOS) | |
---|---|
Type: | Earth observation satellite |
Country: | Japan |
Operator: | JAXA |
COSPAR-ID : | 2006-002A |
Mission dates | |
Dimensions: | 4 t |
Begin: | January 24, 2006 |
Starting place: | Tanegashima Space Center |
Launcher: | H-II A F8 |
Status: | April 22, 2011: failure |
Orbit data | |
Track height: | 691.65 km |
Orbit inclination : | 98.16 ° |
The Advanced Land Observation Satellite ( German advanced land observation satellite ), short ALOS , after starting renamed Daichi ( 'earth', earth '), a Japanese earth observation satellite , the Earth in a sun-synchronous orbits orbit. It provides data for cartography , environmental protection and disaster management . With ALOS, Japan participates in the International Charter on Space and Natural Disasters .
For unknown reasons, the power supply failed on April 22, 2011 and the satellite could no longer be addressed. The follow-up mission ALOS 2 was launched on May 24, 2014.
Data
The energy supply is 7 kW ( EOL ), so a service life of 3 to 5 years is planned. The satellite flies over the same locations in a cycle of 3 days. The position control accuracy is specified with ground control points 2.0 × 10 −4 ° , the orbit position accuracy should be 1 m offline. The data obtained by the optics are transferred to an onboard data memory with 90 Gb, a solid-state data recorder is used . When transmitting via Data Relay Technology Satellite , a data transmission rate of 240 Mbps is achieved; direct transmission does half.
equipment
The satellite has 3 instruments on board:
- PRISM for stereo recordings
- Panchromatic remote-sensing instrument for stereo mapping- Spectral band 0.52 - 0.77 μm
- Number of optics: 3 (Nadir / Forward / Backward)
- Width-height ratio: 1.0 (Forward / Backward)
- S / N :> 70 = 18 dB
- MTF:> 0.2
- Local resolution on the ground: 2.5 m
- Swath width: 35 km (Triplet mode), 70 km (Nadir Only, Wide swath mode)
- Pointing angle ± 1.5 deg (triplet mode)
- the radiometer AVNIR-2
- Advanced Visible and Near Infrared Radiometer Type 2- Spectral band (μm) Band1: 0.42 - 0.50, Band2: 0.52 - 0.60, Band3: 0.61 - 0.69, Band4: 0.76 - 0.89
- S / N:> 200 (23 dB)
- MTF:> 0.2
- Resolution: 10 m (with Nadir Pointing)
- Swath Latitude: 70 km (at Nadir Pointing)
- Pointing angle: ± 44 deg.
- the L-band radar PalSAR
- Phased Array L-Band Synthetic Aperture Radar- in high resolution mode:
- Frequency : L-band (1.27 GHz, corresponding to 23.6 cm wavelength)
- Polarization HH, VV, HH&HV, VV&VH
- Resolution: 10 m
- Swath Width: 70 km
- Off-nadir angle: 10-51 °
- in ScanSAR mode:
- Frequency: L-band (1.27 GHz)
- Polarization: HH, VV
- Resolution: 100 m
- Swath Latitude: 250-350 km
- Off-nadir angle: 10-51 °
- in high resolution mode:
Individual evidence
- ↑ Japan's ALOS Craft Hit by Power Glitch. In: SpaceNews. April 11, 2011, accessed July 30, 2016 .
- ↑ Thomas Weyrauch: Japanese Earth observation satellite ALOS 2 launched. raumfahrer.net, May 24, 2014, accessed on May 26, 2014 .
Web links
- ALOS project website ( Memento from April 9, 2006 in the Internet Archive ) (English / Japanese)
- First images of ALOS (English)
- ESA: Japan's environmental scout: the lord of the trees