provides in the Middle East the most advanced weather radar
technology “HYDRIX”, based on the ZPHI algorithm,
and offers a unique solution to meet hydrologists’
requirements. This is made possible through its partnership
with NOVIMET a company at the forefront of technological
innovation in the environmental industry.
is a software for rain rate retrieval from polarimetric
weather radar data, able to compensate for three error sources:
• The attenuation of the radar wave through the precipitation
• The natural variability of the drop size distribution
·The radar calibration error
is designed to process in real time the data from an operational
polarization diversity weather radar. Its performance was
validated by publications in international scientific journals.
main ZPHI® characteristics are the following:
• Real time implementation, ray by ray analysis.
• Excellent accuracy of the rain rate estimate, obtained
with the scanning velocities (5 ą 15°/s) required
• Production in parallel of a DSD parameter.
• Robustness with any type of rain, and at any radar
frequency (S, C, ou X).
Associated with a classification of the precipitation
distinguishing convective rain, stratiform rain,
precipitation, solid precipitation.
consists of the combination of a polarisation diversity
weather radar and of an exclusive software for rain rate
retrieval, software ZPHI. It departs from classical weather
radars by: ·Its compact character. Since it operates at
X band (9,3 GHz), its antenna size and pedestal dimension
are smaller those of C band (5,6 GHz) or S band (3 GHz)
radar systems usually used in operational networks. ·Its
improved accuracy. It is much more accurate since it exploits
the polarimetric measurements with help of a new algorithm
for rain rate retrieval: algorithm ZPHI®. This algorithm
constitutes a technological breakthrough in the weather
allows to obtain the rain rate with a much better accuracy
than with the classical radar networks. The estimate is
so good that the rain gauges are no more required as adjuvant
of the radar data to define a rain rate estimate reliable
enough to be plugged in hydrological models.
main characteristics are the following :
• Frequency: 9.3 GHz
• Polarisation diversity capability
• antenna diameter : 1,5 m
• Maximum range for accurate estimate of the
precipitation rate: 60 km; for the detection of
the precipitating and evaluation systems: 120 km.
prototype of radar HYDRIX has been developed by CNRS. It
is presently on operation for test at Boisgneville (France)
on the experimental site of ARVALIS (Institut du végétal).
A test of software ZPHI has been conducted separately with
the X band polarimetric radar of the National Research Institute
for Earth Science and Disaster Prevention (NIED) in Japan.
An industrial prototype of HYDRIX is in development.