Main Characteristics of JERS-1 Satellite
| Dimensions | Bus body: approx 1m x 1.8m x 3.1m Box_shape SAR Antenna: approx 12m x 2.5m Solar Cell Paddle: approx 8m x 3.4m | |
|---|---|---|
| Weight | approx 1.4 tons | |
| Attitude and Orbit Control Subsystem |
3-Axis Attitude/Zero-momentum System | |
| Design Life | 2 years | |
| Launch Vehicle | H-1 Launch Vehicle | |
| Launch Site |
Tanegashima Space Center | |
| Launched Date | Feburary 11, 1992 | |
| Orbit | Sort of orbit | Sun Synchronous Subrecurrent Orbit |
| Altitude | approx 570km | |
| Orbit inclination | approx 98 degree | |
| Period | approx 96 minutes | |
| Recurrent period | 44 days | |
| Local time at descending node | a.m.10:30Å`a.m.11:00 | |
Parameters of transmission and recording equipments
JERS-1 is equipped with following instruments exclusivel for
transmitting and recording observed data.
| Mission Data Transmitter [MDT] |
Carrier Frequency | 8GHz Bands, 2 channels |
|---|---|---|
| Modulation | QPSK | |
| Power amplifier | TWT(Helix type) | |
| Antenna type | Shaped reflector beam antenna | |
| Mission Data Recorder [MDR] |
Recording data rate | 30Mbps x 2ch |
| Recording Time | 20 minutes |
OPS major characteristics
| OPtical Sensor [OPS] |
Swath | Å@Å@Å@75km |
|---|---|---|
| Resolution | 18m x 24m | |
| Number of Observation Bands |
Å@Å@Å@3 visible and near infrared bands 1 stereo-viewing band 4 shortwave infrared bands |
2. Reflectance characteristics of Minerals
The relation between the reflectance of minerals and the wavelength range of each short wave infrared(SWIR) bands are shown in the following figure.
The JERS-1 OPS band configuration and their effectiveness in mineral
classification with SWIR relative reflectance pattern.
An OPS Image shown below, is from typical altered zone, which is
processed and analyzed by ERSDAC.
(Click the JPEG-image, then expand to
GIF:903x900pixels, 1168kB)
JERS-1, OPS ratio compressed image(BGR=6/8, 2/1, 3/5).
Observation Date: October 9, 1992 Path 534-Row 239
Beatty, Nevada, USA.
The area high-lighted in yellow with ratio compressed, indicate
possibly containing gold-silver deposits in the Tertiary clastic rocks.
(central part of the image)
The areas covered by OPS observations during the operation of JERS-1 (11.Feb.1992~12.Oct.1998),
are shown in red area of following chart.
If you wont to look the map more detail, Please click it.
