JERS-1 INSTRUMENTS

Explore instruments used in JERS-1 mission.

EXPLORE INSTRUMENTS

JERS-1 DATA

JERS-1 data is freely and openly available to everyone.

ACCESS MISSION DATA

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

About JERS-1

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

JERS-1 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.

JERS-1 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.

JERS-1 Data

DATA DOWNLOAD

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.

DATA DESCRIPTION

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

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.