Analysis of the Influence of IQ Imbalance Demodulation on DEM Measurement of Satellite Millimeter-Wave InSAR

IQ imbalance is one of the main factors leading to the amplitude and phase consistency of millimeter wave radar channels, which will bring about the interferometric phase error of millimeter wave interferometric synthetic aperture radar (InSAR). In this paper, the problem of IQ imbalance of InSAR receiving channel is modeled and analyzed, the mathematical expressions of IQ imbalance error parameters and interference phase error are derived, the influence of IQ imbalance on interference phase error and elevation error is analyzed quantitatively, The analysis results are very useful the design of spaceborne millimeter wave InSAR system.