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JRC’s Weather Radar history begins in 1954 with the construction of the very first japanese weather radar, the NMD-451. Over sisty years later, JRC has expanded to Asia, América and Europe, providing state of the art radars with solid state tecnology. See our timeline bellow for our list of inovations during this history.
| 1954 | Japan’s first weather radar (NMD-451) |
|---|---|
| 1980 | Japan’s first airport weather radar (JMA-225). |
| 1981 | Japan’s first Doppler weather radar (JMM-1). |
| 2011 | World’s first S-band solid-state weather radar (JMA-254). |
| 2013 | C-band solid-state weather radar (JMA-540). |
| 2014 | X-band solid-state compact weather radar (JMA-912). |
In modern days, JRC’s Radar Systems are developed with solid state technology and offer high performance based on polymeric processing and pulse compression to monitor weather conditions and predict occurrences.
The models available in the market today are:
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.
The JMA-912 has a compact and rugged body. It can be used not only as a fixed station but also as a mobile or transportable station.
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.
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. In addition, it is compatible with Smartphones and Tablets.
| JMA-912(X-band) | JMA-540(C-band) | JMA-254 Series(S-band) | |
|---|---|---|---|
| Doppler | Yes | Yes | Yes |
| Dual polarization | Yes | Yes | No |
| Operating Frequency | 9.70-9.80GHz (9.35-9.70GHz*) | 5.6-5.65GHz (5.25-5.35, 5.65-5.80GHz*) | 2.7-2.9GHz |
| Observation Range | 80km@23dBz 120km@27.8dBz | 300km@18.4dBz 400km@23dBz | 400km@21.5dBz 450km@23dBz |
| Antenna Diameter | ≤1.2m(=3.9feet) | ≤4.3m(=14.1feet) | ≤5m(=16.4feet) |
| Radome Diameter | Approx.1.8m(=5.9feet) | Approx.7m(=23feet) | Approx.8m(=26.2feet) |
| Minimum Observation mesh | 150m mesh | 250m mesh | 250m mesh |
| Target | Local weather Mobile RADAR (High precision, low price,Space-saving, Mobile) | Meso scale weather Airport weather conditions (Cost-benefit system) | Wide area weather Typhoon,Hurricane,Cyclone (Long range observation) |
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.
The JMA-912 has a compact and rugged body. It can be used not only as a fixed station but also as a mobile or transportable station.
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.
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. In addition, it is compatible with Smartphones and Tablets.
Based on the diagram bellow, we can see how easy it is to aquire the JMA-912’s data. All you need is a personal computer conected to the radar through a LAN cable and you are able to control the radar and aquire it’s data. This is called the Radar Workstation. You are also able to expand this through a Network to control the radar remotely.
J-BIRDS software allows data analysis and integration with many features. Particularly, the RAINWATCHER, when connected to a server, may be utilized to create better forecast of landslides and flods.
| Type | Polarimetric radar with solid-state technology |
|---|---|
| Operation Frequency | 9.70-9.80GHz(Option:9.35-9.70GHz) |
| Observation Range | 80km@23dBz, 120km@27.8dBz |
| Antena Diameter | ≤1.2m |
| 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. φ 1.8m |
| Transmitter Type | ≤60m/s(gust) |
| Tipo de transmissor | 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(ρhv) Liner Depolarization Ratio(LDRvh/hv) |
| Power Consumption | ≤450VA@100-230Vac, 1φ2W, 50/60Hz |
