Method for improving polarization isolation of dual-polarization phased array weather radar

Abstract

The invention discloses a method for improving polarization isolation of a dual-polarization phased array weather radar. The method is characterized in that the scheme is as follows: when a PPAR is ina dual-polarization working state, quadrature phase sequence coding is adopted to perform phase modulation on transmitted signals of two polarization channels so as to reduce cross coupling between the two polarization channels, reduce ZDR deviation, ensure that a differential reflectivity error can meet requirements, and reduce the influence on a co-polarization correlation coefficient and a differential phase at the same time. At present, an expected target is realized by virtue of phased-array antenna hardware, and the price is very high. 180-degree phase changes between signal pulses areincreased in transmitted horizontal or vertical ports to reduce differential reflectance errors, however, errors in co-polarization correlation coefficient estimation are increased, and in some cases,errors in differential phase estimation are also increased. Compared with the prior art, the method has the advantages of reasonable scheme design, simple equipment, low implementation cost, excellent performance and the like.

Description

technical field [0001] The invention relates to the technical field of pulse Doppler radar measurement, in particular to a method for improving the polarization isolation of a dual-polarization phased array weather radar. Background technique [0002] Since the birth of radar, people have started to use it to conduct research on precipitation detection and measurement. After nearly a hundred years of development, dual polarization weather radar can improve the accuracy of meteorological detection and forecast due to its ability to distinguish the phase state of cloud and rain targets, and can improve forecasters and algorithms to distinguish different types of precipitation (such as rainfall, hail) and non-weather scattering (such as insects, ground clutter), and more accurate qualitative precipitation estimation (QPE), become the mainstream of current weather radar. On this basis, further application of phased array technology to realize phased array dual polarization weat...

AI Technical Summary

Problems solved by technology

The use of dipole antenna elements can improve the isolation of the two polarizations, but it is difficult to meet the detection requirements after beam scanning

In order to solve the polarization isolation problem of the dual-polarization phased array weather radar, the US patent (US2011 / 0285582) proposes a cylindrical phased array weather radar. The antenna array unit is installed on the cylindrical surface to ensure that the beam is scanned in azimuth No change in performance, this method solves the case of horizontal scanning, but does nothing for the deformation of beam polarization when scanning vertically

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