JERS-1

Mission

blue arrow Overview

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.

JERS-1 Mission Parameters
Orbit Height 568km
Orbit Type Sun Synchronous
Repeat Cycle 44 days

blue arrow Objectives

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.

blue arrow Instruments

 

Synthetic Aperture Radar (SAR)

JERS-1 carried an early example of a SAR instrument. It was an L-band(HH polarisation) synthetic aperture radar

Performance Parameters of the JERS-1/SAR instrument
Center frequency 1.275 GHz (L-band, 23.5 cm wavelength)
Bandwidth 15 MHz
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
Antenna
Polarization
Look angle
Antenna gain
Signal to ambiguity ratio
Array of 1024 microstrip radiation elements
HH
35.21°
>33.5 dB
>14 dB
Data quantization 3 bits
Data rate 3 Mbit/s

 

 

Optical Sensor (OPS)

This was a nadir-pointing multi-spectral imager.

Specification of OPS Spectral Bands

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.

blue arrow Data

blue arrow DATA DOWNLOAD

Download data from the JERS-1 mission through the ESA TPM Online Dissemination system. The data is freely available to registered EO-SSO users.

blue arrow DATA DESCRIPTION

ESA offers to registered user the access through the Online Dissemination server to the following data collections:

blue arrow DATA QUALITY

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.