JERS-1 (Japanese Earth Resources Satellite) 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.
|Band No||Spectral Range||General Application|
|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.
ESA offers to registered user the access through the Online Dissemination server to the following data collections:
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.