P-Band (400 MHz) Polarimeter for Irrigation
Sensor & Installation
The sensor operates on solar power and includes a 12V lead-acid battery, eliminating the need for pivot rewiring. Its horizontal mounts comprise four aluminum pipes, each 1 to 1.5 inches in diameter, which can be sourced and manufactured locally.
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Data collection occurs while the pivot is in motion. When stationary, data are captured hourly.
Cloud Processing
The sensor uploads raw data directly to Skaha's server. Data acquired during pivot rotation undergo processing to differentiate unpolarized from polarized emissions, with the assumption that polarized emissions result from radio interference. Stationary data undergo a similar processing. Both raw and processed data are then transferred to a designated Google Drive folder.
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Note: Cellular service is essential for the optimal functioning of the pivot-mounted sensor.
Calibration
We predict average soil moisture levels for individual fields using our proprietary land surface model. This modelled average serves as a calibration reference for the microwave data, translating it into units of volumetric water content. Furthermore, the model assists in converting this volumetric water content into plant-available water values according to specific soil textures.
Daily Moisture Status Emails
The system generates daily status emails with the most important, up-to-date information about the field's moisture status, such as average field moisture, plant available water level, evapotranspiration, and a prediction of the water balance for the next seven days. This information is complemented by soil moisture maps for the field.
Integration time (adjustable) | Up to 120 seconds |
Theoretical sensing depth | 50 cm |
Data outputs | Brightness temperature of polarized and unpolarized component. |
Max. Bandwidth | 12 MHz |
Number of FFT channels | 256 |
Cellular band | worldwide |
Power supply | 10 - 35 VDC |
Polarization | Dual linear (horizontal & vertical) |
Operating frequency | 380 - 420 MHz |
Antenna HPBW | 65 deg |
Antenna dimensions | 45 x 45 x 15 cm |
Telemetry unit weight (incl. battery) | 4.5 kg |
Antenna weight | 2.5 kg |
Options and Pricing
Included:
- Antenna
- Digital processor and telemetry
- Cellular modem and SIM card
- 12V lead-acid battery
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Not included:
- Mounts
- Solar panel