Radar rainfall estimation technique when attenuation is negligible
First Claim
1. A method of using a bipolar radar to estimate a precipitation rate for rain that generates negligible attenuation, the method being constituted by the following steps:
- using said bipolar radar to measure the differential phase Φ
DP and the apparent reflectivity Ze on at least one of horizontal polarization H and vertical polarization V over a given interval [r0, r1] of path radii relative to said radar;
making an estimate of the value N0* representative of the dimensional distribution of rain drops on the basis of the differential phase difference in the range r0 to r1 and on the basis of an integral of a function of the apparent reflectivity Ze along the interval [r0, r1]; and
deducing a value for the precipitation rate at a point from N0* and the apparent reflectivity at said point.
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Accused Products
Abstract
The invention provides a method of using a bipolar radar to estimate a precipitation rate for rain that generates negligible attenuation, the method being constituted by the following steps:
using said bipolar radar to measure the differential phase ΦDP and the apparent reflectivity Ze on at least one of horizontal polarization H and vertical polarization V over a given interval [r0, r1] of path radii relative to said radar;
making an estimate of the value N0* representative of the dimensional distribution of rain drops on the basis of the differential phase difference in the range r0 to r1 and on the basis of an integral of a function of the apparent reflectivity Ze along the interval [r0, r1]; and
deducing a value for the precipitation rate at a point from N0* and the apparent reflectivity at said point.
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Citations
9 Claims
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1. A method of using a bipolar radar to estimate a precipitation rate for rain that generates negligible attenuation, the method being constituted by the following steps:
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using said bipolar radar to measure the differential phase Φ
DP and the apparent reflectivity Ze on at least one of horizontal polarization H and vertical polarization V over a given interval [r0, r1] of path radii relative to said radar;
making an estimate of the value N0* representative of the dimensional distribution of rain drops on the basis of the differential phase difference in the range r0 to r1 and on the basis of an integral of a function of the apparent reflectivity Ze along the interval [r0, r1]; and
deducing a value for the precipitation rate at a point from N0* and the apparent reflectivity at said point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification