JERS-1 was an environmental Japanese satellite, also known as 'Fuyo-1', which launched on 11 February 1992 and ceased operations in October 1998. JERS-1 was a radar/optical mission and was developed by NASDA, the National Space Development Agency of Japan.
|Orbit Type||Sun Synchronous|
|Repeat Cycle||44 days|
The overall objectives of JERS-1 were the generation of global data sets with SAR and OPS sensors aimed at surveying resources, establishing an integrated Earth observation system, verifying instrument/system performances. The mission applications focused on survey of geological phenomena, land usage, observation of coastal regions, geologic maps, environment, disaster monitoring and demonstration of two-pass SAR interferometry for change detection.
Synthetic Aperture Radar (SAR)
JERS-1 carried an early example of a SAR instrument. It was an L-band(HH polarisation) synthetic aperture radar
|Center frequency||1.275 GHz (L-band, 23.5 cm wavelength)|
|Spatial resolution||18 m (range) x 18 m (azimuth, 3 looks)|
|Swath width||175 km|
|Transmitting power||35 µs|
|PRF (Pulse Repetition Frequency)||1505.8 - 1606.0 Hz|
Signal to ambiguity ratio
|Array of 1024 microstrip radiation elements
|Data quantization||3 bits|
|Data rate||3 Mbit/s|
Optical Sensor (OPS)
This was a nadir-pointing multi-spectral imager.
|1||0.52 - 0.60 µm VIS (green)||Vegetation surveys, land use, water monitoring|
|2||0.63 - 0.69 µm VIS (red)||Chlorophyll absorption for vegetation differentiation|
|3||0.76 - 0.86 µm NIR||Biomass surveys (nadir viewing)|
|4||0.76 - 0.86 µm NIR||Biomass surveys (forward looking, at 15.3º to give stereo coverage with band 3)|
|5||1.60 - 1.71 µm (SWIR)||Vegetation moisture|
|6||2.01 - 2.12 µm (SWIR)||Hydrothermal mapping (eg. soils; geology)|
|7||2.13 - 2.25 µm (SWIR)||Hydrothermal mapping (eg. soils; geology)|
|8||2.27 - 2.40 µm (SWIR)||Hydrothermal mapping (eg. soils; geology)|
Non-scientific measuring instrument
AVNIR: Side-looking optical camera.
Download data from the JERS-1 mission through the ESA TPM Online Dissemination system. The data is freely available to registered EO Sign In users.
ESA offers to registered user the access through the Online Dissemination server to the following data collections:
- OPS (Optical Sensor) Very Near Infrared Radiometer: VNIR Level 1 System Corrected Products
- JERS-1 SAR Level 1 Single Look Complex Image: slant-range projected complex image in zero-Doppler SAR coordinates
- JERS-1 SAR Level 1 Precision Image: ground range projected detected image in zero-Doppler SAR coordinates
The SAR Precision Image product is a multi-look (speckle-reduced), ground range, system corrected image. The product is calibrated and corrected for the SAR antenna pattern and range-spreading loss: radar backscatter can be derived from the product for geophysical modelling, but no correction is applied for terrain-induced radiometric effects. The image is not geocoded and terrain distortion (foreshortening and layover) has not been removed.