Passive microwave observations
DSμRAD
Overview
By measuring ultra-wideband microwave power in the environment, for example, the amount of water vapor in the atmosphere can be retrieved.
The ultra-wideband AD conversion technology and digital spectral processing cultivated by Direct RF Samplers with DSP can measure an ultra-wideband microwave spectrum in high frequency resolution instantly.
ELECS Industry has realized this concept▲1 as the hyperspectral microwave radiometer DSμRAD for the first time in the world ▲2.
▲2 Based on our investigation
Applications
Passive microwave remote sensing (geophysical value retrieval), Monitoring electromagnetic environment in microwave band.
Features
- Instantaneous brightness temperature spectrum measurement of vertically and/or horizontally polarized microwave from 512 MHz to 40.96 GHz at 16 MHz spacing.
- Miniaturization by ultra-wideband direct RF sampling (under-sampling) technology.
- Calibration to the brightness temperature spectrum using only passive elements, not liquid nitrogen or noise diodes▲3.
Specifications
| Observation frequency |
Module 1 0.512～ 8.192 GHz
Module 2 8.192～16.384 GHz Module 3 16.384～24.576 GHz Module 4 24.576～32.768 GHz Module 5 32.768～40.96 GHz * Please select one or more modules from the above when ordering. |
|---|---|
| Observation polarization |
Vertical and/or Horizontal
* Please decide the number of observation polarizations when ordering. |
| Channel spacing | Selectable from 16/32/64/128 MHz for every installed frequency module at the start of measurement. |
| Integration time | Selectable from 1/10/100/1000 msec for every installed frequency module at the start of measurement. |
| Brightness temperature measurement range | 3 ～ 1200 K |
| Brightness temperature measurement precision | Typ. 1 K (＠300 K) |
| Power supply | AC 100 ～ 240 V or DC 12～32 V |
| Dimensions |
700 x 270 x 270 mm
*Excluding protrusions such as rubber feet and handles |
| Weight |
Max 30 kg
*Depends on the number of observation frequency modules and observation polarizations |
Observation scenery
Monitoring of the electromagnetic environment in Tokyo Bay using DSμRAD.
Publication
T. Maeda, N. Kawaguchi, K. Harada, K. Ozeki, Y. Chikahiro, H. Onuki, Y. Hayashi, K. Ema, K. Naoki, M. Nakayama, and T. Takano: Direct RF Sampling Hyperspectral Microwave Radiometer (DSμRAD) for Ground Use, IEEE Geoscience and Remote Sensing Letters, doi: 10.1109/LGRS.2020.2990707.
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