Dual polarization high isolation antenna and spaceborne synthetic aperture radar active scaler

Abstract

A dual polarization high isolation antenna is characterized by comprising a conical horn for serving as a transmitting end or a receiving end of a signal; an orthogonal mode coupler connected with theconical horn for realizing waveguide conversion. The dual-polarization high isolation antenna can receive both horizontally polarized signals and vertically polarized signals. Another aspect of the present invention provides a spaceborne synthetic aperture radar active calibrator comprising the dual polarization high isolation antenna described above. The scheme provided by the invention can flexibly provide various calibration scattering matrices required by the active calibrator, reduce the complexity of the system, and greatly improve the convenience of use.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to a dual-polarization high-isolation antenna and an active calibrator including the dual-polarization high-isolation antenna for calibrating spaceborne synthetic aperture radar. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) Active Calibrator is the key equipment for on-orbit calibration of spaceborne polarimetric SAR and an important part of the satellite ground system. It can be used for spaceborne SAR polarization calibration and antenna pattern measurement, calibration constant measurement, image quality assessment, etc. The polarization calibration of spaceborne SAR based on the active calibration device is the main technical basis for obtaining the on-orbit distortion matrix parameters of satellite payloads, the basic link to realize the high-precision data processing and application of spaceborne SAR system, and the key to improve the spacebo...

AI Technical Summary

Problems solved by technology

Although the four-antenna form adopted by the former can realize all the functions of the polarized active scaler, due to the large number of antennas, the active scaler system is very bulky, which greatly reduces the convenience of the system

The latter realizes the scattering matrix of the polarized active scaler through 45° rotation, resulting in a single scattering matrix, and the polarization state is very sensitive to the rotation angle, and it is difficult to flexibly provide various scattering matrices required by the active scaler

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