Arbitrary polarized wave generation and calibration methods

Abstract

The invention relates to an arbitrary polarized wave generation and calibration method. The generation method comprises the following steps: generating digital signals in a base band, and carrying out amplitude-phase adjustment and compensation on two paths of orthogonal digital signals; and converting the digital signals into analog signals, up-converting the analog signals into radio frequency signals, carrying out power amplification and distribution on the radio frequency signals through two transmitters, and synthesizing polarized waves in arbitrary polarization directions in an ortho-mode coupler by two signals. In the design of polarized signal calibration, the calibration method includes steps of coupling two paths of a few signals from two paths of transmission signals to enter calibration channels; comparing the consistency of signals in the two channels and searching the minimum difference of two phases of polarization signals by using an optimization algorithm; and comparing the differences of the two paths of signals, feeding the differences back to a polarized wave generation unit, and measuring and compensating the generated signals so as to ensure the consistency of the signals in the two channels.

Description

Technical field [0001] The invention is applied to the technical field of dual-polarization weather radar, and the method can not only generate arbitrarily polarized electromagnetic waves, but also can measure and calibrate polarized electromagnetic waves, thereby improving the accuracy of polarization radar measurement. Background technique [0002] With the successful application of dual-polarized radar in meteorological detection and meteorological particle identification, dual-polarized radar has gained wide recognition and application prospects in the field of meteorological particle (hail, haze, etc.) detection and artificial weather modification. In the past two to three decades, domestic and foreign research and production institutions have successively carried out in-depth research on polarized radar technology, especially polarized wave generation, measurement and calibration. The first radar to report polarization scattering matrix measurement was the DCR radar produce...

AI Technical Summary

Problems solved by technology

Second, transmitter power, receiver gain, and noise level vary randomly and slowly over time, leading to instability in dual-polarization radar systems

Ferrite devices have the weakness of temperature drift, and the polarization isolation decreases rapidly when the environment changes

Especially when dual polarization is transmitted at the same time, the difference between the two channels leads to a measurement error of about 4dB in differential reflectivity, which cannot meet the 0.1dB error accuracy requirement in meteorological detection.

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