X-Band RAINWATCHER JMA-912

Weather Radar System

Features

X-Band Compact Weather Radar with Fully Solid State Technology

Wide-range radar performance with a compact design.

X-Band Compact Weather Radar with Fully Solid State Technology

All-In-One

The JMA-912 system is a compact, all-in-one design consisting of an antenna, an antenna control unit, a transmitter/receiver unit, and a signal processor unit, all of which are housed in a 1.8m high and 1.8m diameter radome. This all-in-one radar can be easily transported and installed.
Weather radar observation can be conducted by using only a general-purpose PC connected to the radar sensor by an optical LAN cable.

Earthquake Resistance

The JMA-912 has dual-polarization/doppler functions and an earthquake-resistant, rugged body. It can be used not only as a fixed station but also as a mobile or transportable station due to its compact design.

High-performance and High-resolution

The JMA-912 is a small mesh resolution weather radar and can be used for local observation such as to observe urban torrential rain. It has the sensitivity to detect a rain phenomenon of 1mm/h at observation range more than 80km. In addition, doppler speed is detected from differences between transmission frequency and reception frequency and each parameter of polarized wave is detected from dual polarization constitution.

Flexibility

The radar control software has a Web interface function. This function makes it possible to perform observation control, operation monitoring, editing of the observation schedule, and viewing of operation history including the alarm information and remote diagnostics of the radar from every PC connected on the network.

Functions

JMA-912 Functions

  • Although the equipment is compact, it still offers high-performance observation of various meteorological phenomena, allowing for dual polarization observation as well as precipitation intensity and Doppler velocity observation.
  • The antenna can be controlled variably in elevation steps from -2° to 182°, allowing the vertical section data across a wide coverage.
  • The high-precision rainfall measurement becomes possible by using the phase information without the effect of radio wave attenuation through heavy rain area. Also, it is possible to guess the kinds of particles (raindrops, hails or graupels) based on the differential reflectivity of raindrops. By using the information obtained from this radar, rapid and effective countermeasures for disasters such as river floods in urban areas and flowing debris in mounatainous areas can be made.

JMA-912 Advantages

Exceptional reliability

  • Solid-state transmitter

High data accuracy

  • Polarimetric function
  • Wide dynamic range, high linearity, high phase stability, high resolution
  • High-speed arithmetic processing

High economic efficiency

  • Low power consumption
  • No preheating, no preliminary operation
  • No consumables

Easier maintenance

  • No consumables
  • Maintenance free of antenna mechanical part except lubrication

Safety consideration

  • No use high voltage

System

X-Band Compact Weather Radar with Fully Solid State Technology

X-Band Compact Weather Radar with Fully Solid State Technology

Specs

JMA-912 Specifications

Type Polarimetric radar with solid-state technology
Operating Frequency 9.70-9.80GHz(Option:9.35-9.70GHz)
Observation Range 80km@23dBz, 120km@27.8dBz
Antena Diameter ≤1.2m(=3.9feet)
Antenna Gain ≥38dB
Half Power Beam width(typical) ≤2.0°
Polarization Linear Horizontal & Vertical Dual Polarization(Simultaneous & Alternative H/V)
Angle Span AZ:Full 360° EL:-2 to +182° (0.1° step)
Scannig Speed AZ:0-6rpm(0.1rpm step) EL:0-3rpm(0.1rpm step)
Radome size Approx.φ1.8m(=5.9feet)
Survival Wind Speed ≤60m/s(gust)
Transmitter Type Solid-State Power Amplifier
Peak Power 125W(H)+125W(V)
Basic Data Output Uncorrected Reflectivity(Pr)
Precipitation Intensity(Zhh)
Mean Radial Velocity(Vh)
Spectral Width(Wh)
Polarimetic Data Output Differential Reflectivity(ZDR)
Differential Phase Sift(φDP)
Specific Differential Phase Shift(KDP)
Polarimetric Correlation Coefficient(phv)
Liner Depolarization Ratio(LDRvh/hv)
Power Consumption ≤450VA@100-230VAC, 1φ2W, 50/60Hz
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